Station Overview Station Location
Station Number CO-BO-30 Latitude 39.9915
Station Name Boulder 1.9 SE Longitude -105.2403
County Boulder Elevation (ft) 5368



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 16 1.39 0.38 31 0.38 31 0.00 0 0 5 1 0.0 0 0
Nov 16 1.04 0.42 30 0.42 30 0.00 0 0 3 1 5.5 1 2
Dec 16 0.79 0.79 31 0.79 31 0.00 0 0 6 4 11.5 4 9
Jan 17 0.64 1.33 31 1.33 31 0.00 0 0 9 1 17.4 7 11
Feb 17 0.63 0.58 28 0.58 28 0.00 0 0 4 5 7.3 2 6
March 17 1.86 0.97 31 0.97 31 0.00 0 0 7 1 0.0 0 0
April 17 2.34 2.80 30 2.80 30 0.00 0 0 12 1 16.9 4 4
May 17 2.66 6.21 31 6.21 31 0.00 0 0 18 1 7.0 2 3
June 17 2.16 0.24 30 0.24 30 0.00 0 0 6 5 0.0 0 0
July 17 1.67 1.59 31 1.59 31 0.00 0 0 7 8 0.0 0 0
Aug 17 1.76 1.37 31 1.37 31 0.00 0 0 11 6 0.0 0 0
Sept 17 1.61 1.59 30 1.59 30 0.00 0 0 9 2 0.0 0 0
Water Year Totals: 18.55" 18.27" 365 days 18.27" 365 0.00" 0 days 0 97 days 36 days 65.6" 20 days 35 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2016 T
10/2/2016 0.00
10/3/2016 0.00
10/4/2016 0.00
10/5/2016 0.00
10/6/2016 0.12
10/7/2016 0.08
10/8/2016 0.00
10/9/2016 0.00
10/10/2016 0.00
10/11/2016 0.00
10/12/2016 0.13
10/13/2016 0.02
10/14/2016 0.00
10/15/2016 0.00
10/16/2016 0.00
10/17/2016 0.00
10/18/2016 0.00
10/19/2016 0.03
10/20/2016 0.00
10/21/2016 0.00
10/22/2016 0.00
10/23/2016 0.00
10/24/2016 0.00
10/25/2016 0.00
10/26/2016 0.00
10/27/2016 0.00
10/28/2016 0.00
10/29/2016 0.00
10/30/2016 0.00
10/31/2016 0.00
11/1/2016 0.00
11/2/2016 T
11/3/2016 0.00
11/4/2016 0.00
11/5/2016 0.00
11/6/2016 0.00
11/7/2016 0.00
11/8/2016 0.00
11/9/2016 0.00
11/10/2016 0.00
11/11/2016 0.00
11/12/2016 0.00
11/13/2016 0.00
11/14/2016 0.00
11/15/2016 0.00
11/16/2016 0.00
11/17/2016 0.00
11/18/2016 0.34
11/19/2016 0.00
11/20/2016 0.00
11/21/2016 0.00
11/22/2016 0.06
11/23/2016 0.02
11/24/2016 0.00
11/25/2016 0.00
11/26/2016 0.00
11/27/2016 0.00
11/28/2016 0.00
11/29/2016 0.00
11/30/2016 0.00
12/1/2016 0.00
12/2/2016 0.00
12/3/2016 0.01
12/4/2016 0.00
12/5/2016 0.00
12/6/2016 0.00
12/7/2016 0.29
12/8/2016 0.01
12/9/2016 0.00
12/10/2016 0.00
12/11/2016 0.05
12/12/2016 0.01
12/13/2016 0.00
12/14/2016 T
12/15/2016 T
12/16/2016 0.00
12/17/2016 0.42
12/18/2016 0.00
12/19/2016 0.00
12/20/2016 0.00
12/21/2016 0.00
12/22/2016 0.00
12/23/2016 0.00
12/24/2016 0.00
12/25/2016 0.00
12/26/2016 T
12/27/2016 0.00
12/28/2016 0.00
12/29/2016 T
12/30/2016 0.00
12/31/2016 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2017 0.00
1/2/2017 0.00
1/3/2017 0.01
1/4/2017 0.01
1/5/2017 0.79
1/6/2017 0.09
1/7/2017 0.00
1/8/2017 0.00
1/9/2017 0.00
1/10/2017 0.04
1/11/2017 0.00
1/12/2017 0.01
1/13/2017 T
1/14/2017 0.00
1/15/2017 0.00
1/16/2017 0.27
1/17/2017 0.09
1/18/2017 0.00
1/19/2017 0.00
1/20/2017 0.00
1/21/2017 0.00
1/22/2017 0.00
1/23/2017 0.00
1/24/2017 0.00
1/25/2017 0.02
1/26/2017 0.00
1/27/2017 0.00
1/28/2017 0.00
1/29/2017 0.00
1/30/2017 0.00
1/31/2017 0.00
2/1/2017 0.00
2/2/2017 0.11
2/3/2017 0.01
2/4/2017 T
2/5/2017 0.00
2/6/2017 0.00
2/7/2017 0.00
2/8/2017 0.01
2/9/2017 0.00
2/10/2017 0.00
2/11/2017 0.00
2/12/2017 T
2/13/2017 0.00
2/14/2017 0.00
2/15/2017 0.00
2/16/2017 0.00
2/17/2017 0.00
2/18/2017 0.00
2/19/2017 0.00
2/20/2017 T
2/21/2017 0.00
2/22/2017 0.00
2/23/2017 T
2/24/2017 0.45
2/25/2017 T
2/26/2017 0.00
2/27/2017 0.00
2/28/2017 0.00
3/1/2017 0.00
3/2/2017 0.00
3/3/2017 0.00
3/4/2017 0.00
3/5/2017 0.00
3/6/2017 0.00
3/7/2017 0.00
3/8/2017 0.00
3/9/2017 0.00
3/10/2017 0.00
3/11/2017 0.02
3/12/2017 0.00
3/13/2017 0.00
3/14/2017 0.00
3/15/2017 0.00
3/16/2017 0.00
3/17/2017 0.00
3/18/2017 0.00
3/19/2017 0.00
3/20/2017 0.00
3/21/2017 0.00
3/22/2017 T
3/23/2017 0.00
3/24/2017 0.16
3/25/2017 0.00
3/26/2017 0.01
3/27/2017 0.18
3/28/2017 0.16
3/29/2017 0.40
3/30/2017 0.00
3/31/2017 0.04
Day of YearDaily PrcpMultiday Prcp
4/1/2017 0.46
4/2/2017 0.02
4/3/2017 0.01
4/4/2017 0.55
4/5/2017 0.51
4/6/2017 0.00
4/7/2017 0.00
4/8/2017 0.00
4/9/2017 0.00
4/10/2017 0.00
4/11/2017 0.00
4/12/2017 0.00
4/13/2017 0.00
4/14/2017 0.00
4/15/2017 0.00
4/16/2017 0.00
4/17/2017 0.00
4/18/2017 0.00
4/19/2017 0.00
4/20/2017 0.00
4/21/2017 0.22
4/22/2017 0.16
4/23/2017 T
4/24/2017 0.00
4/25/2017 0.06
4/26/2017 0.04
4/27/2017 0.00
4/28/2017 0.08
4/29/2017 0.43
4/30/2017 0.26
5/1/2017 0.00
5/2/2017 0.00
5/3/2017 0.03
5/4/2017 0.18
5/5/2017 0.00
5/6/2017 0.00
5/7/2017 0.00
5/8/2017 0.04
5/9/2017 0.72
5/10/2017 0.04
5/11/2017 0.51
5/12/2017 0.02
5/13/2017 0.00
5/14/2017 0.00
5/15/2017 T
5/16/2017 0.00
5/17/2017 0.09
5/18/2017 1.51
5/19/2017 1.94
5/20/2017 0.00
5/21/2017 0.00
5/22/2017 0.43
5/23/2017 0.23
5/24/2017 0.00
5/25/2017 0.00
5/26/2017 0.22
5/27/2017 0.01
5/28/2017 0.19
5/29/2017 0.01
5/30/2017 0.02
5/31/2017 0.02
6/1/2017 0.00
6/2/2017 0.02
6/3/2017 0.02
6/4/2017 0.00
6/5/2017 0.00
6/6/2017 T
6/7/2017 T
6/8/2017 0.02
6/9/2017 T
6/10/2017 0.00
6/11/2017 0.00
6/12/2017 0.00
6/13/2017 0.00
6/14/2017 0.00
6/15/2017 0.00
6/16/2017 0.00
6/17/2017 0.00
6/18/2017 T
6/19/2017 0.00
6/20/2017 0.00
6/21/2017 0.02
6/22/2017 0.00
6/23/2017 0.12
6/24/2017 T
6/25/2017 0.00
6/26/2017 0.00
6/27/2017 0.00
6/28/2017 0.00
6/29/2017 0.00
6/30/2017 0.04
Day of YearDaily PrcpMultiday Prcp
7/1/2017 0.00
7/2/2017 0.00
7/3/2017 T
7/4/2017 T
7/5/2017 0.00
7/6/2017 0.00
7/7/2017 0.00
7/8/2017 0.01
7/9/2017 T
7/10/2017 0.00
7/11/2017 0.00
7/12/2017 T
7/13/2017 0.02
7/14/2017 0.00
7/15/2017 0.00
7/16/2017 T
7/17/2017 0.00
7/18/2017 0.00
7/19/2017 0.00
7/20/2017 T
7/21/2017 T
7/22/2017 0.31
7/23/2017 0.00
7/24/2017 0.00
7/25/2017 0.00
7/26/2017 0.05
7/27/2017 0.83
7/28/2017 0.00
7/29/2017 0.36
7/30/2017 0.01
7/31/2017 T
8/1/2017 0.00
8/2/2017 0.00
8/3/2017 0.12
8/4/2017 T
8/5/2017 0.13
8/6/2017 0.11
8/7/2017 0.09
8/8/2017 0.67
8/9/2017 0.07
8/10/2017 0.01
8/11/2017 0.07
8/12/2017 0.00
8/13/2017 0.00
8/14/2017 0.03
8/15/2017 0.00
8/16/2017 0.04
8/17/2017 0.03
8/18/2017 T
8/19/2017 0.00
8/20/2017 0.00
8/21/2017 0.00
8/22/2017 0.00
8/23/2017 0.00
8/24/2017 T
8/25/2017 T
8/26/2017 T
8/27/2017 0.00
8/28/2017 0.00
8/29/2017 0.00
8/30/2017 0.00
8/31/2017 T
9/1/2017 0.01
9/2/2017 0.00
9/3/2017 0.00
9/4/2017 0.00
9/5/2017 0.00
9/6/2017 0.00
9/7/2017 0.00
9/8/2017 0.00
9/9/2017 0.00
9/10/2017 0.00
9/11/2017 T
9/12/2017 0.00
9/13/2017 0.00
9/14/2017 0.00
9/15/2017 0.00
9/16/2017 0.01
9/17/2017 0.00
9/18/2017 T
9/19/2017 0.00
9/20/2017 0.00
9/21/2017 0.00
9/22/2017 0.00
9/23/2017 0.00
9/24/2017 0.97
9/25/2017 0.09
9/26/2017 0.03
9/27/2017 0.02
9/28/2017 0.33
9/29/2017 0.06
9/30/2017 0.07



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2016 7:00 AM T 0.0 M 0.0 M A few sprinkles between 0700 and 0900 MDT 30 Sep 2016. Brief sprinkles again ~1600 MDT. Trace precip both times.
10/2/2016 7:00 AM 0.00 0.0 M 0.0 M
10/3/2016 7:00 AM 0.00 0.0 M 0.0 M
10/4/2016 7:00 AM 0.00 0.0 M 0.0 M
10/5/2016 7:00 AM 0.00 0.0 M 0.0 M
10/6/2016 7:00 AM 0.12 0.0 M 0.0 M RW- 0400 to 0645 MDT 06 Oct 2016. Precip 0.12"
10/7/2016 7:00 AM 0.08 0.0 M 0.0 M RW- 1100-1115 MDT 06 Oct 2016. Precip .02". Small area of RW- crossed South Boulder 1930-2030 MDT. Precip here +.06". First frost (heavy) and freeze at obs time 07 Oct. Min 30 deg F.
10/8/2016 7:00 AM 0.00 0.0 M 0.0 M
10/9/2016 7:00 AM 0.00 0.0 M 0.0 M
10/10/2016 7:00 AM 0.00 0.0 M 0.0 M
10/11/2016 7:00 AM 0.00 0.0 M 0.0 M
10/12/2016 7:00 AM 0.13 0.0 M 0.0 M Brief sprinkles 0845 MDT 11 Oct 2016. Trace precip. RW- began 2100 MDT. Occasional showers overnite. Slight drizzle falling at observation time. 24-h precip 0.13".
10/13/2016 7:00 AM 0.02 0.0 M 0.0 M Drizzle at start of observing period ended by 1100 MDT 12 Oct 2016. Precip .02".
10/14/2016 7:00 AM 0.00 0.0 M 0.0 M
10/15/2016 7:00 AM 0.00 0.0 M 0.0 M
10/16/2016 7:00 AM 0.00 0.0 M 0.0 M
10/17/2016 7:00 AM 0.00 0.0 M 0.0 M
10/18/2016 7:00 AM 0.00 0.0 M 0.0 M
10/19/2016 7:00 AM 0.03 0.0 M 0.0 M A few drops of rain at 2035 MDT 18 Oct 2016 (trace). RW- 0030-0100 MDT 19 Oct, precip 0.03".
10/20/2016 7:00 AM 0.00 0.0 M 0.0 M
10/21/2016 7:00 AM 0.00 0.0 M 0.0 M
10/22/2016 7:00 AM 0.00 0.0 M 0.0 M
10/23/2016 7:00 AM 0.00 0.0 M 0.0 M
10/24/2016 7:00 AM 0.00 0.0 M 0.0 M
10/25/2016 7:00 AM 0.00 0.0 M 0.0 M
10/26/2016 7:00 AM 0.00 0.0 M 0.0 M
10/27/2016 7:00 AM 0.00 0.0 M 0.0 M
10/28/2016 7:00 AM 0.00 0.0 M 0.0 M
10/29/2016 7:00 AM 0.00 0.0 M 0.0 M
10/30/2016 7:00 AM 0.00 0.0 M 0.0 M
10/31/2016 7:00 AM 0.00 0.0 M 0.0 M
11/1/2016 7:00 AM 0.00 0.0 M 0.0 M
11/2/2016 7:00 AM T 0.0 M 0.0 M Brief sprinkles ~1700 MDT 01 Nov 2016 and again perhaps around 0600 MDT 02 Nov. Trace precip both times.
11/3/2016 7:00 AM 0.00 0.0 M 0.0 M
11/4/2016 7:00 AM 0.00 0.0 M 0.0 M
11/5/2016 7:00 AM 0.00 0.0 M 0.0 M
11/6/2016 7:00 AM 0.00 0.0 M 0.0 M
11/7/2016 7:00 AM 0.00 0.0 M 0.0 M
11/8/2016 7:00 AM 0.00 0.0 M 0.0 M
11/9/2016 7:00 AM 0.00 0.0 M 0.0 M
11/10/2016 7:00 AM 0.00 0.0 M 0.0 M
11/11/2016 7:00 AM 0.00 0.0 M 0.0 M
11/12/2016 7:00 AM 0.00 0.0 M 0.0 M
11/13/2016 7:00 AM 0.00 0.0 M 0.0 M Of note: Roses, asters, nasturtiums, daisies, mums, pansies, begonias, primroses, and lantanas are still blooming on Nov 13! If not unprecedented, at least highly unusual.
11/14/2016 7:00 AM 0.00 0.0 M 0.0 M
11/15/2016 7:00 AM 0.00 0.0 M 0.0 M
11/16/2016 7:00 AM 0.00 0.0 M 0.0 M
11/17/2016 7:00 AM 0.00 0.0 M 0.0 M
11/18/2016 7:00 AM 0.34 5.5 M 4.5 M Occasional light drizzle mid morning 17 Nov 2016. S- began 1055 MDT, the first flakes of the season. 34 deg F at 1100 MDT. S-3/4 by 1110 MDT. Precip .02 at 1115 MDT with a trace accumulation on the grass. 1.0" on the ground by 1200 MDT with S3/8. Snow tapered off to S-3/4 by 1230 MDT, then to S- after 1300 MDT, except for SW1/2 1340-1350 MDT. S- ended at 1700 MDT. More S- 1900 to 2130 MDT. Max accumulation 5.5". Precip from 1115 to 2130 MDT, when snow ended, +0.32". Clearing early 18 November. 4.5" on ground at 0700 MDT.
11/19/2016 7:00 AM 0.00 0.0 M 3.0 M 3.0" inches of snow remains on ground at obs time.
11/20/2016 7:00 AM 0.00 0.0 M T M Warm chinook in the early morning hours pushed temperature to 59 deg F. 20-30 mph west winds melted remaining snow before obs time this morning. A trace of snow remains in shaded areas.
11/21/2016 7:00 AM 0.00 0.0 M 0.0 M
11/22/2016 8:00 AM 0.06 0.0 M 0.0 M Brief RW-- ~1730 MDT 21 Nov 2016. Trace precip. R- began ~0500 MDT 22 Nov and was still falling at 0800 MDT (delayed obs time). Precip so far .06".
11/23/2016 7:00 AM 0.02 0.0 M 0.0 M R- in progress at start of observing period ended by 1000 MST 23 Nov 2016. Pcpn .02".
11/24/2016 7:00 AM 0.00 0.0 M 0.0 M
11/25/2016 7:00 AM 0.00 0.0 M 0.0 M
11/26/2016 7:00 AM 0.00 0.0 M 0.0 M
11/27/2016 7:00 AM 0.00 0.0 M 0.0 M
11/28/2016 7:00 AM 0.00 0.0 M 0.0 M
11/29/2016 7:00 AM 0.00 0.0 M 0.0 M
11/30/2016 7:00 AM 0.00 0.0 M 0.0 M
12/1/2016 7:00 AM 0.00 0.0 M 0.0 M
12/2/2016 7:00 AM 0.00 0.0 M 0.0 M
12/3/2016 7:00 AM 0.01 T M T M
12/4/2016 7:00 AM 0.00 0.0 M 0.0 M
12/5/2016 7:00 AM 0.00 0.0 M 0.0 M
12/6/2016 7:00 AM 0.00 0.0 M 0.0 M
12/7/2016 7:00 AM 0.29 5.7 M 5.7 M First flakes in the air at 1440 MST 06 Dec 2016. Measurable snow began 1730 MDT. At 0030 MST 07 Dec, S-1, 3.1" accumulated on grass with a water content of 0.19". S- continued thru obs time at 0700 MST 07 Dec, when accumulation was 5.7 (max measured), with an additional water content of .10".
12/8/2016 7:00 AM 0.01 0.1 M 4.0 M S-- in progress at start of observing period. S-- and occasional SW- during the morning. At 1400 MST 07 Dec 16, 0.1" had accumulated since 0700 MST with a water content of .01". Ice crystals in the air now and then in the afternoon and evening of 07 Dec (trace). Snow settled during the observing period to 4.0" at 0700 MST 08 Dec 2016.
12/9/2016 7:00 AM 0.00 0.0 M 3.0 M Sharp inversion at 0805 MDT 09 Dec 2016. Simultaneously 12 deg F in my back yard and 41 deg F at the NCAR Mesa Lab only 600 ft higher and 2 miles WSW.
12/10/2016 7:00 AM 0.00 0.0 M 2.5 M
12/11/2016 7:00 AM 0.05 0.1 M 0.1 M Strong chinook and 55RW- began ~0200 MST 11 Dec, changed to SW- before ending ~0500 MST. Accumulation 0.1" of slushing snow on grass. Precip .05".
12/12/2016 7:00 AM 0.01 T M 0.0 M A few snow pellets in the air until 0930 MST 11 Dec 2016 (trace precip). Then alternating sunshine and snow showers 0930-1130 MST. Precip .01, trace accumulation. This melted quickly in the afternoon.
12/13/2016 7:00 AM 0.00 0.0 M 0.0 M
12/14/2016 7:00 AM T 0.0 M 0.0 M A few flakes in the air shortly before obs time at 0700 MST 14 Dec 2016. Trace precip, no accumulation.
12/15/2016 7:00 AM T T M 0.0 M S-- 0715-1015 MST 16 Dec 2016 with the arrival of Arctic air mass. Trace precip, trace accumulation (dusting).
12/16/2016 7:00 AM 0.00 0.0 M 0.0 M 52-deg F temperature range today, from 14 deg F at 0700 MST to 66 deg F at 1400 MST.
12/17/2016 7:00 AM 0.42 5.6 M 5.6 M S- began 1920 MST 16 Dec 2016, continued, sometimes moderate (S1/2) til 0030 MST 17 Dec. S- from then until ending before 0600 MST. At 0700 MST 5.6" accumulation (max measured)with a water content of 0.42".
12/18/2016 7:00 AM 0.00 0.0 M 4.5 M
12/19/2016 7:00 AM 0.00 0.0 M 4.0 M
12/20/2016 7:00 AM 0.00 0.0 M 3.5 M
12/21/2016 7:00 AM 0.00 0.0 M T M Downslope winds and max of 60 deg F during the day 20 Dec 2016 reduced snow cover in open areas to less than 50% late in the day. 30% coverage in open areas at obs time.
12/22/2016 7:00 AM 0.00 0.0 M T M A trace of snow remains in shaded areas.
12/23/2016 7:00 AM 0.00 0.0 M T M Snow remains in well shaded areas.
12/24/2016 7:00 AM 0.00 0.0 M T M Snow remains in well-shaded areas.
12/25/2016 7:00 AM 0.00 0.0 M T M Snow remains in well shaded areas.
12/26/2016 7:00 AM T 0.0 M T M A few small snow pellets occasionally in the air from 0940 to 1050 MST 25 Dec 2016. Trace precip, no accumulation. Patchy snow remains in well shaded areas.
12/27/2016 7:00 AM 0.00 0.0 M T M Patchy snow remains in well shaded areas.
12/28/2016 7:00 AM 0.00 0.0 M 0.0 M
12/29/2016 7:00 AM T 0.0 M 0.0 M Occasional flakes in the air, blown off Divide, 1145 to 1300 MST 28 Dec 2016. Trace precip, no accumulation.
12/30/2016 7:00 AM 0.00 0.0 M 0.0 M
12/31/2016 7:00 AM 0.00 0.0 M 0.0 M
1/1/2017 7:00 AM 0.00 0.0 M 0.0 M
1/2/2017 7:00 AM 0.00 0.0 M 0.0 M
1/3/2017 9:00 AM 0.01 0.3 M 0.3 M A few flakes noted in flashlight beam at 2200 MST 02 Jan 2016. By 0300 MST 03 Jan, slight dusting of snow on the ground (trace precip). At 0900 MST (late obs), 0.3" accumulation with a water content of .01". S-- still falling but sun dimly visible.
1/4/2017 7:00 AM 0.01 0.2 M 0.2 M Overnight snow 0.2”, all fluffy dendrites, pcpn .01, rounded up. Snowing at 0200 MST 04 Jan but start and end times uncertain: guess 0100-0300 MST.
1/5/2017 7:00 AM 0.79 10.4 M 10.4 M S-, visibility 1-2 miles, began ~0900 MST 04 Jan 2016 and continued all day, becoming S-3/4 by late afternoon. At 1900 MST, S-3/4, 7° (min so far), 4.1" accumulation, precip .18". S- continued all night with the exception of S1/2 0000-0300 MST. At 0700 MST 05 Jan, 3 deg F (min so far), S-1, tiny crystals, accumulation on ground 10.4”. Precip since 1900 MST 04 Jan +.61". 24-h total .79"
1/6/2017 7:00 AM 0.09 1.1 M 8.5 M S- in progress at start of observing period. Continuous snowfall ended at 1100 MST 05 Jan 2017. Occasional SW- after that until 1315 MST, at which time max accumulation of 10.8" was measured. 1.1" fell since 0700 MST with a water content of .09". Snow depth had settled to 8.5" at obs time today.
1/7/2017 7:00 AM 0.00 0.0 M 7.0 M
1/8/2017 7:00 AM 0.00 0.0 M 7.0 M Chinook starting ~0300 MST this morning. Temperature rose from min of 10 deg F at 2200 MST/07 Jan to mid 40s by obs time.
1/9/2017 9:00 AM 0.00 0.0 M T M Strong chinook arrived suddenly at 0225 MST 09 Jan 2017, driving temperature upward from overnight min of 31 deg F to upper 50s in 20 minutes. Many gusts in the 50-60 mph range. This was sufficient to bring snow cover in open areas to less than 50% by 0900 MST 09 Jan. About 1.5" of slushy snow remains in shaded areas.
1/10/2017 7:00 AM 0.04 0.0 M M 0.00 Chinook melted all snow yesterday, even in shaded areas. RW- 2150-2200 MST 09 Jan 2017 associated with short wave passage. Precip .06".
1/11/2017 7:00 AM 0.00 0.0 M 0.0 M
1/12/2017 7:00 AM 0.01 0.2 M T M Quick snow shower between 1645 and 1715 MST 11 Jan 2017 deposited 0.2" of snow with a water content of .01". Only a trace left on the ground at obs time.
1/13/2017 7:00 AM T T M T M Snow, mostly very light, began 1700 MST and ended 1900 MST 12 Jan 2017, enough to dust ground white but not measurable. Trace precip.
1/14/2017 7:00 AM 0.00 0.0 M 0.0 M
1/15/2017 7:00 AM 0.00 0.0 M 0.0 M
1/16/2017 7:20 AM 0.27 3.9 M 3.9 M S-- began ~ 1730 MST 15 Jan 2017. Very light dusting by 1800 MST, 33°. Snow ended by 1900 MST. Trace accumulation, trace precip. Steady S- began ~0000 MST, has continued thru obs time. At 0720 MST 16 Jan, 3.9" accumulation, water content 0.27".
1/17/2017 7:00 AM 0.09 1.3 M 3.5 M S- in progress at start of observing period, ended at 1030 MST 16 Jan 2017. Max accumulation of 5.2" measured at that time. New accumulation since 0720 MST 1.3" with a water content of 0.09". 3.0" of snow remains on ground this morning at obs time.
1/18/2017 7:00 AM 0.00 0.0 M 2.5 M
1/19/2017 7:00 AM 0.00 0.0 M 1.5 M About 70% of open ground still covered with ~1.5" of snow.
1/20/2017 7:00 AM 0.00 0.0 M 1.0 M At obs time, slightly more than half the ground in open areas is covered with 1.0 snow.
1/21/2017 7:00 AM 0.00 0.0 M T M About an inch of snow remains in shaded areas. Open areas mostly bare.
1/22/2017 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/23/2017 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/24/2017 7:00 AM 0.00 0.0 M T M Snow remains only in shaded areas.
1/25/2017 7:00 AM 0.02 0.0 M T M Freezing drizzle 0930 to 1130 MST 24 Jan 2017. Sidewalks and streets briefly icy, as temperature was about 26 deg F. Precip .02. Snow that fell many days ago remains in shady areas.
1/26/2017 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/27/2017 7:00 AM 0.00 0.0 M T M Patchy snow remains in shaded areas.
1/28/2017 7:00 AM 0.00 0.0 M 0.0 M After yesterday's sunshine and temperature in the mid 40s, snow was hard to find this morning. It's gone.
1/29/2017 7:00 AM 0.00 0.0 M 0.0 M
1/30/2017 7:00 AM 0.00 0.0 M 0.0 M
1/31/2017 7:00 AM 0.00 0.0 M 0.0 M
2/1/2017 7:00 AM 0.00 0.0 M 0.0 M
2/2/2017 8:00 AM 0.11 0.1 M 0.1 M Freezing drizzle began 1600 MST 01 Feb 2017, continued thru the evening. Glaze ice did not form on pavement until late night because of stored heat from three precious days when max temperature was 60 deg F or more. Precip changed to light snow grains after 0400 MST 02 Feb. At 0800 MST 02 Feb, 0.1" snow accumulation, total precipitation was 0.10" (NOT 0.11"...that amount was forced by error checker).
2/3/2017 7:00 AM 0.01 T M 0.1 M Continuous snow ended at 0845 MST 02 Feb 2016, but flakes could be seen in the air throughout the day. Precip .01" to 0845 MST, but only a trace thereafter. 0.1" of snow and ice remains on the ground at obs time.
2/4/2017 7:00 AM T 0.0 M T M A few spatial dendrites in the air during the morning of 03 Feb 2017. Trace precip; no accumulation. Thin coating of ice and snow remains in shaded areas at obs time.
2/5/2017 7:00 AM 0.00 0.0 M 0.0 M All snow and ice in shaded areas melted during chinook on 04 Feb 2017.
2/6/2017 7:00 AM 0.00 0.0 M 0.0 M
2/7/2017 7:00 AM 0.00 0.0 M 0.0 M
2/8/2017 7:00 AM 0.01 0.0 M 0.0 M RW- 0345-0400 MST 08 Feb 2017. Precip .01"
2/9/2017 7:00 AM 0.00 0.0 M 0.0 M
2/10/2017 7:00 AM 0.00 0.0 M 0.0 M
2/11/2017 7:00 AM 0.00 0.0 M 0.0 M Daily record max of 76 deg F set Friday afternoon 10 Feb. Record max for the entire month of Feb is 79 deg F, set of 08 Feb 1954.
2/12/2017 7:00 AM T 0.0 M 0.0 M A few small drops of rain in the air during the afternoon of 11 Feb 2016. Trace precip
2/13/2017 7:00 AM 0.00 0.0 M 0.0 M
2/14/2017 7:00 AM 0.00 0.0 M M M
2/15/2017 7:00 AM 0.00 0.0 M 0.0 M
2/16/2017 7:00 AM 0.00 0.0 M 0.0 M
2/17/2017 7:00 AM 0.00 0.0 M 0.0 M
2/18/2017 7:00 AM 0.00 0.0 M 0.0 M
2/19/2017 7:00 AM 0.00 0.0 M 0.0 M
2/20/2017 7:00 AM T 0.0 M 0.0 M Very light rain showers ~ 1900 MST 19 Feb 2017, associated with short wave passing eastward across the Front Range. Trace precip.
2/21/2017 7:00 AM 0.00 0.0 M 0.0 M
2/22/2017 7:00 AM 0.00 0.0 M 0.0 M
2/23/2017 7:00 AM T 0.0 M 0.0 M Light drizzle or freezing drizzle began ~0630 MST 23 Feb 2017, continues at obs time. Trace precip so far.
2/24/2017 8:00 AM 0.45 7.2 M 7.2 M Drizzle falling at start of observation period, 0700 MST 23 Feb 2017, quickly changed to S- by 0730L. Snow fell all day, moderate at times, especially mid morning and mid aftn (S3/8 to S1/2). At 1730 MST 23 Feb, S-1, 22° (min so far), 5.8" on the ground, pcpn .37". S-- or S- most of the night, mostly dendrites, very fluffy. At 0800 MST 24 Feb, S-1 still falling, sun dimly visible, 18° (min so far), 7.2" on the ground (max so far), 2.4 of fluff since 1730 MST 23 Feb, with a water content of +.08".
2/25/2017 7:00 AM T T M 3.5 M Very light snow in progress at start of observing period, 0800 MST 24 Feb 2016. Snow ended at 0915 MST with sun visible. With cold air aloft SW- developed during the afternoon, but only a trace of precip fell, with a trace of accumulation. This morning, 3.5" of snow remains on the ground.
2/26/2017 7:00 AM 0.00 0.0 M 3.0 M
2/27/2017 7:00 AM 0.00 0.0 M 2.0 M 2.0" of crusty snow remains. Ground is bare under trees.
2/28/2017 7:00 AM 0.00 0.0 M T M Open ground more than 50% bare by the evening of 27 Feb 2017, so only a trace of snow reported this morning.
3/1/2017 7:00 AM 0.00 0.0 M T M Ground still white with snow in shaded areas.
3/2/2017 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
3/3/2017 7:00 AM 0.00 0.0 M T M Snow remains in well shaded areas.
3/4/2017 7:00 AM 0.00 0.0 M M 0.00 All snow melted by late yesterday afternoon, even in well shaded areas.
3/5/2017 7:00 AM 0.00 0.0 M 0.0 M
3/6/2017 7:00 AM 0.00 0.0 M 0.0 M
3/7/2017 7:00 AM 0.00 0.0 M 0.0 M
3/8/2017 7:00 AM 0.00 0.0 M 0.0 M
3/9/2017 7:00 AM 0.00 0.0 M 0.0 M
3/10/2017 7:00 AM 0.00 0.0 M 0.0 M
3/11/2017 8:00 AM 0.02 0.0 M 0.0 M Light rain showers 0500-0730 MST 11 Mar 2017. Precip .02".
3/12/2017 7:00 AM 0.00 0.0 M 0.0 M
3/13/2017 7:00 AM 0.00 0.0 M 0.0 M
3/14/2017 7:00 AM 0.00 0.0 M 0.0 M
3/15/2017 7:00 AM 0.00 0.0 M 0.0 M
3/16/2017 7:00 AM 0.00 0.0 M 0.0 M
3/17/2017 7:00 AM 0.00 0.0 M 0.0 M
3/18/2017 7:00 AM 0.00 0.0 M 0.0 M
3/19/2017 7:00 AM 0.00 0.0 M 0.0 M
3/20/2017 7:00 AM 0.00 0.0 M 0.0 M
3/21/2017 7:00 AM 0.00 0.0 M 0.0 M
3/22/2017 7:00 AM T 0.0 M 0.0 M Brief RW-- at 1330 MDT 21 Mar 2017. Trace precip.
3/23/2017 7:00 AM 0.00 0.0 M 0.0 M
3/24/2017 7:00 AM 0.16 0.0 M 0.0 M R- during two periods: 2155-2330 MDT 23 Mar 2017 and again 0230-0330 MDT 24 Mar, with R-- in between and from 0330 to 0500 MDT. Precip .16.
3/25/2017 7:00 AM 0.00 0.0 M 0.0 M
3/26/2017 7:00 AM 0.01 0.0 M 0.0 M Light rainshowers around 2300 MDT 25 March 2017. Precip 0.01".
3/27/2017 7:00 AM 0.18 0.0 M 0.0 M RW- 1245-1530 MDT. Precip .18".
3/28/2017 7:00 AM 0.16 0.0 M 0.0 M RW- ~2030-2300 MDT 27 Mar 2017. Precip .10". More RW- 0430-0700 MDT 28 Mar. Precip .06").
3/29/2017 7:00 AM 0.40 0.0 M 0.0 M R- 1115-1600 MDT 28 Mar 2017. Precip .26", then R- or R-- until ~2200 MDT (precip +.14").
3/30/2017 7:00 AM 0.00 0.0 M 0.0 M
3/31/2017 7:00 AM 0.04 0.0 M 0.0 M Ocnl RW- 2200 MDT 30 March 2017 to 0030 MDT 31 March. Precip .04".
4/1/2017 7:00 AM 0.46 T M T M Drizzle in progress at start of observing period, 0700 MDT 01 Apr 2017. Drizzle or light rain continuous all day, changing to a mix of R-/S- 2200 MDT. This ended ~0600 MDT 02 April. At most a trace of slush on the ground. 24-h precip 0.46". March 2017 very unusual in that there was no measurable snow. It happened last in 2012 but, before that, not since 1918.
4/2/2017 7:00 AM 0.02 0.0 M 0.0 M Occasional drizzle during the morning of 01 April 2017, from 0730-1030 MDT. Precip .02".
4/3/2017 7:00 AM 0.01 0.0 M 0.0 M RW- 0000-0100 MST 03 April 2017. Precip .01".
4/4/2017 7:00 AM 0.55 6.1 M 6.1 M R- began 2210 MDT 03 Apr 2017, changed to S- ~2330L and continued as S- or S for the rest of the night. At obs time (0700 MDT 04 Apr), 31 deg F (min so far), S-3/4, tiny crystals, 6.1" accumulation on the ground. Storm precip so far 0.55".
4/5/2017 7:00 AM 0.51 3.8 M 5.8 M S- in progress at start of observing period, continued thru 0830 MDT April 4, 2017L, then tapered off and ended by 1000 MDT, by which time sun was dimly visible. Precip since 0700 MDT .07", new accumulation 0.5". Max depth of 6.1" on ground at 0700 MDT did not increase. Instead, sunshine 1000-1200L and temperatures rising to low 40s melted snow quickly, about halving the depth by mid afternoon. Second round of snow began S- began at 1610 MDT. S- still falling at 19 MDT with embedded SW½. At 2205L, S5/8, 32°, +3.0” new snow since 1610 MDTL, 5.5 total on ground, pcpn +.41. S- ended ~2330 MDT with +.03 pcpn and +0.3” accumulation. Clearing by 0300 MDT 05 April with a hard freeze. Min temperature 24 deg F at 0600 MDT. 5.8" of snow on the ground at 0700 MDT. 24-h totals: Precip 0.51", new snowfall 3.8".
4/6/2017 7:00 AM 0.00 0.0 M T M Snow melted quickly yesterday under a warm sun. Max 55 deg F. This morning, snow remains only in shaded areas.
4/7/2017 7:00 AM 0.00 0.0 M 0.0 M All snow melted during the day 06 Apr 2017, even in well shaded areas.
4/8/2017 7:00 AM 0.00 0.0 M 0.0 M
4/9/2017 7:00 AM 0.00 0.0 M 0.0 M
4/10/2017 7:00 AM 0.00 0.0 M 0.0 M
4/11/2017 7:00 AM 0.00 0.0 M 0.0 M
4/12/2017 7:00 AM 0.00 0.0 M 0.0 M
4/13/2017 7:00 AM 0.00 0.0 M 0.0 M
4/14/2017 7:00 AM 0.00 0.0 M 0.0 M
4/15/2017 7:00 AM 0.00 0.0 M 0.0 M
4/16/2017 7:00 AM 0.00 0.0 M 0.0 M
4/17/2017 7:00 AM 0.00 0.0 M 0.0 M
4/18/2017 7:00 AM 0.00 0.0 M 0.0 M
4/19/2017 7:00 AM 0.00 0.0 M 0.0 M
4/20/2017 7:00 AM 0.00 0.0 M 0.0 M
4/21/2017 7:00 AM 0.22 0.0 M 0.0 M RW- 1400-1430 MDT 20 Apr 2017. Precip .02". RW began 1820 MDT. Thunder heard twice 1828 and 1829 MDT. Rain ended 1840 MDT. Precip +.08". Occasional RW- overnite, ending before 0500 MDT 21 April. Precip +.12". 24-h total 0.22".
4/22/2017 7:00 AM 0.16 0.0 M 0.0 M RW- 1200-1300 MDT 21 Apr 2017. Precip .01". R- began again ~1600 MDT, continued thru 2045 MDT, by which time pcpn was very light. Precip +.09 since 1300 MDT. Slow drip for the rest of the night. Precip had ended by 0700 MDT 22 Apr with +.06 since 2045 MDT 21 Apr. 24-h total 0.16".
4/23/2017 7:00 AM T 0.0 M 0.0 M Very light sprinkles from 0700-0800 MDT Sat 22 Apr 2017. Trace precip.
4/24/2017 7:00 AM 0.00 0.0 M 0.0 M
4/25/2017 7:00 AM 0.06 0.0 M 0.0 M A few light rain sprinkles, small drops, 1900-1930 MDT 24 Apr 2017. Trace precip. RW- 0000-0015 MDT 25 April. Precip .06"
4/26/2017 7:00 AM 0.04 0.0 M 0.0 M RW- 1240-1300 MDT 25 Apr 2017 had some large drops, graupel and partially melted graupel. Temperature at 54°. Precip .01". No thunder. TRW- (one rumble of thunder) 1730-1745 MDT. Precip +.02". R- began again at 1855 MDT but lasted only about 15 min. Precip +.01". 24-h precip .04".
4/27/2017 7:00 AM 0.00 0.0 M 0.0 M
4/28/2017 7:00 AM 0.08 0.0 M 0.0 M Brief RW-- ~1015 MDT 27 Apr 2017. Trace precip. Thunder heard to the south 1100-1110 MDT. RW- 1115-1135 MDT. RW- 1330-1400 MDT. Precip from both showers .08".
4/29/2017 7:00 AM 0.43 4.9 M 4.9 M From 1345-1410 MDT 28 Apr 2017 SW- (precip .01"). It began with T at 45°. All precip was heavily rimed crystals but not yet graupel. No rain. In more than 30 years, I don't think I've ever seen this at such a high temperature. Cold front arrived at 1545 MDT with rapidly lowering clouds. SW-, again with heavily rimed dendrites, began 1800 MDT. 35° at 1830L. S- continued all night. An estimated 3" accumulation by 0100 MDT 29 April, and 4" by 0400 MDT, at which time snow was very light. At obs time, 0700 MDT, S-, visibility 1 mile, accumulation 4.9" with a water content of 0.43".
4/30/2017 7:00 AM 0.26 2.1 M 5.0 M S- in progress at 0700 MDT 29 Apr 2017. Snowfall picked up to S-5/8-3/4 0715-0830 MDT, when more than an inch fell. S-1 til 1030L, then S-3/4 til 1115L, when sun became dimly visible with S--. At 1130 MDT snow depth 6.5" (max measured during storm), precip since 0700 MDT .18". Intermittent SW- for the rest of the day, finally ending at 1930 MDT. Precip since 1130 MDT +.08", new acc 0.5", but snow on ground settled faster than it accumulated during the afternoon. 24-h precip 0.26" new snowfall 2.1. Minimum temperature at 0600 MDT 30 Apr an impressive 20 deg F.
5/1/2017 7:00 AM 0.00 0.0 M 0.0 M All snow melted by late afternoon 30 Apr 2017, as max temperature reached 62 deg F.
5/2/2017 7:00 AM 0.00 0.0 M 0.0 M
5/3/2017 7:00 AM 0.03 0.0 M 0.0 M RW- 0315-0345 MDT 03 May 2017. Precip .03".
5/4/2017 7:00 AM 0.18 0.0 M 0.0 M R- 0710-1045 MDT 03 Apr 2017. A few partially melted flakes fell with the snow, but melted immediately upon contact with the surface. Precip 0.18".
5/5/2017 7:00 AM 0.00 0.0 M 0.0 M
5/6/2017 7:00 AM 0.00 0.0 M 0.0 M
5/7/2017 7:00 AM 0.00 0.0 M 0.0 M
5/8/2017 7:00 AM 0.04 0.0 M 0.0 M Strong, gusty downburst winds from W beginning ~1515 MDT 07 May 2017, then TRW- that dropped the temperature 20° quickly. Rain fell 1530-1615 MDT (preicp .04). A couple of rumbles of thunder and rather dark. Wind gusts to 45 mph but higher in other parts of Boulder.
5/9/2017 7:00 AM 0.72 0.0 M 0.0 M A few sprinkles of rain 1330-1500 MDT 08 May 2017, not enough to wet pavement (trace). TRW- with an estimated few hundredths precip 1530-1630 MDT. More substantial showers and a few rumbles of thunder after 1730 MDT, continuing intermittently thru the evening. Brief RW+ ~2030 MDT. Rain ended ~2245L. 24-h precip 0.72".
5/10/2017 7:00 AM 0.04 0.0 M 0.0 M RW- 0300-0400 MDT 10 May 2017. Precip .04".
5/11/2017 7:00 AM 0.51 0.0 M 0.0 M R- began 0720 MDT 10 May 2017 with echo motion from 110°. Off and on R-RW-R-- and even brief breaks in precip all day but most rain fell during the morning. Max 53°. Temperature near 50° all day. At 2200 MDT, precip since 0700 MDT .37". R- resumed shortly after 2200 MDT and continued until ~0345 MDT 11 May. Precip during this time +.14, for a 24-h total of 0.51", ending at 0700 MDT 11 May.
5/12/2017 7:00 AM 0.02 0.0 M 0.0 M R- 0725-0800 MDT 11 May 2017. Precip .02".
5/13/2017 7:00 AM 0.00 0.0 M 0.0 M
5/14/2017 7:00 AM 0.00 0.0 M 0.0 M
5/15/2017 7:00 AM T 0.0 M 0.0 M Light sprinkles of rain ~1630 MDT 15 May 2017 as light showers and virga movd NE off foothills across south Boulder. Trace precip.
5/16/2017 7:00 AM 0.00 0.0 M 0.0 M
5/17/2017 7:00 AM 0.09 0.0 M 0.0 M Thunder overhead and east by noon 16 May 2017. Cells moved from 200°. TRW- 1315-1330 MDT. 2nd cell trailed the first, bringing TRW-A (slushy hail up to ½” diameter, widely spaced). Rain ended 1420 MDT. Precip .09".
5/18/2017 7:00 AM 1.51 0.6 M 0.6 M RW- 1615-1630 MDT 17 May 2017. Precip .01". At 1930 MDT hard balls of ½-inch hail fell, followed in a minute or two by TRW+, which lasted ~5 min. By 1940 MDT precip +.14, TRW- continuing. At 2135 MDT, R- continued, precip +.20. R-, occasionally R, continued all night, changing to snow ~0500 MDT. Silver-dollar size flakes ~0630L. At 0700 MDT 18 May, 33° (min so far), S5/8, accumulation 0.6 on grass, precip +.86" as rain from 2135 MDT Wed until changeover, then another .30" until 0700 MDT. 24-h total ending 0700 MDT: 1.51".
5/19/2017 7:00 AM 1.94 6.4 M 6.5 M S5/8 in progress at 0700 MDT 18 May 2017. Moderate wet snow continued during the morning. At noon, S+1/4, quarter-size flakes, 34°, pcpn .88", 5.0” of very wet snow on grass. Snowfall rate high enough that streets and sidewalks are covered with slush. I had to brush snow off large shrubs and trees to prevent limb breakage. S or S+ from noon to 1420 MDT, at which time S5/8, 6.7" accumulation on grass, 34°. Snowfall rate slackened to S-3/4 by 1545 MDT, when sun became barely visible for just a few minutes. Max snow depth of 7.0" measured at this time. After 1600 MDT rain and snow mixed, mostly rain for ~30 min, while precip was lighter, then back to all snow by 1730 MDT. Daytime max 37°. At 1755 MDT, S-3/4, total depth 6.5", 33.5°, precip since noon +.77. Snow had ended ~2000 MDT. At 2215 MDT, minute snow grains falling very lightly, like drizzle, 32.5° (min temperature for the entire storm), 6.8" accumulation on ground, precip since 1755 MDT +.21. Some light and very light snow fell after 2215 MDT, but melting rate exceeded accumulation rate, as it had through much of the day. All snow had ended by 0645 MDT 19 May. Precip since 2215 MDT 18 May +.08". 24-h precip 1.94".
5/20/2017 7:00 AM 0.00 0.0 M 4.0 M A cool, cloudy day on 19 May 2017 with max temperature in the mid 40s did not melt much of the dense snow cover. 4.0" remains at obs time, 0700 MDT 20 May.
5/21/2017 7:00 AM 0.00 0.0 M T M All snow melted in open areas by late afternoon on 20 May 2017. At obs time this morning, only patchy snow left in well shaded areas.
5/22/2017 7:00 AM 0.43 0.0 M 0.0 M Light sprinkles 1600-1630 MDT 21 May 2017 (trace precip). RW- 1750-2030 MDT. Thunder heard 2025 MDT. Precip .06". East-west line of RW- formed over Boulder, moving east, with rain resuming by 2115 MDT, continuing until ~2300 MDT. Pcpn +.37". 24-h total .43".
5/23/2017 7:00 AM 0.23 0.0 M 0.0 M RW- 1645-2100 MDT 22 May 2017. Precip 0.23".
5/24/2017 7:00 AM 0.00 0.0 M 0.0 M
5/25/2017 7:00 AM 0.00 0.0 M 0.0 M
5/26/2017 7:00 AM 0.22 0.0 M 0.0 M RW- moving off mountains brought SW to NW gusts to 40 mph, dust, and RW- 0955-1000 MDT 25 May 2017. Precip .01". Intermittent RW- began ~1830 MDT. TRW- and full rainbow at 1920 MDT, when precip quit. Precip +.01". TRW 2350 MDT 25 May to 0010 MDT 26 May. Precip +.20".
5/27/2017 7:00 AM 0.01 0.0 M 0.0 M Intermitent TRW- 1200-1300 MDT 26 May 2017. Precip .01".
5/28/2017 7:00 AM 0.19 0.0 M 0.0 M RW-- ~0815 MDT 27 May 2017 (trace precip). RW-/R- 1130- 1330 MDT (precip .17"). RW-- ~ 1515 MDT (trace precip). More RW- 1700-1800 MDT (precip +.02"). 24-h total .19".
5/29/2017 7:00 AM 0.01 0.0 M 0.0 M Brief RW- ~0030 MDT 29 May 2017. Precip .01".
5/30/2017 7:00 AM 0.02 0.0 M 0.0 M TRW- 1310-1340 MDT (precip +.02) and light sprinkles ~1515 MDT (trace precip).
5/31/2017 7:00 AM 0.02 0.0 M 0.0 M RW- 2115-2130 MDT 30 May 2017. Precip .02".
6/1/2017 7:00 AM 0.00 0.0 M 0.0 M
6/2/2017 7:00 AM 0.02 0.0 M 0.0 M TRW- 1520-1530 MDT 01 June 2017. Precip .02".
6/3/2017 7:00 AM 0.02 0.0 M 0.0 M RW-- between 1100 and 1200 MDT 02 June 2017. Trace precip. TRW- 1530-1600 MDT. Precip .02".
6/4/2017 7:00 AM 0.00 0.0 M 0.0 M
6/5/2017 7:00 AM 0.00 0.0 M 0.0 M
6/6/2017 7:00 AM T 0.0 M 0.0 M A few drops of rain during the noon hour 05 June 2017 with thunder. Sprinkles twice more during the afternoon. 24-h precip a trace.
6/7/2017 7:00 AM T 0.0 M 0.0 M Thunder heard 1345-1415 MDT 06 Jun 2017 and few drops of rain ~1400 MDT. Trace precip.
6/8/2017 7:00 AM 0.02 0.0 M 0.0 M Thunder heard 1330-1400 MDT 07 Jun 2017, then RW-- 1415-1430 MDT (trace, just enough to wet the pavement). TRW- 2100-2115L (precip .02").
6/9/2017 7:00 AM T 0.0 M 0.0 M TRW-- 1900-1915 MDT 08 Jun 2017. Trace precip.
6/10/2017 7:00 AM 0.00 0.0 M 0.0 M
6/11/2017 7:00 AM 0.00 0.0 M 0.0 M
6/12/2017 7:00 AM 0.00 0.0 M 0.0 M
6/13/2017 7:00 AM 0.00 0.0 M 0.0 M
6/14/2017 7:00 AM 0.00 0.0 M 0.0 M
6/15/2017 7:00 AM 0.00 0.0 M 0.0 M
6/16/2017 7:00 AM 0.00 0.0 M 0.0 M
6/17/2017 7:00 AM 0.00 0.0 M 0.0 M
6/18/2017 7:00 AM T 0.0 M 0.0 M A few drops of rain ~1620 MDT 17 June 2017. Trace precip.
6/19/2017 7:00 AM 0.00 0.0 M 0.0 M
6/20/2017 7:00 AM 0.00 0.0 M 0.0 M
6/21/2017 7:00 AM 0.02 0.0 M 0.0 M TRW- 2230-2300 MDT 20 June 2017. Precip .02".
6/22/2017 7:00 AM 0.00 0.0 M 0.0 M
6/23/2017 7:00 AM 0.12 0.0 M 0.0 M RW- from 0500 to 0600 MDT 23 June 2017 associated with passage of cold front. Precip 0.12"
6/24/2017 7:00 AM T 0.0 M 0.0 M A few sprinkles of rain between 0700 MDT and mid morning, 23 June 2017. Trace precip.
6/25/2017 7:00 AM 0.00 0.0 M 0.0 M
6/26/2017 7:00 AM 0.00 0.0 M 0.0 M
6/27/2017 7:00 AM 0.00 0.0 M 0.0 M
6/28/2017 7:00 AM 0.00 0.0 M 0.0 M
6/29/2017 7:00 AM 0.00 0.0 M 0.0 M
6/30/2017 7:00 AM 0.04 0.0 M 0.0 M TRW- 1700-1715 MDT 29 June 2017. Precip 0.01". RW- 0000-0030 MDT 30 June. Precip +.03".
7/1/2017 7:00 AM 0.00 0.0 M M M
7/2/2017 7:00 AM 0.00 0.0 M M M
7/3/2017 7:00 AM T M M M M Thunder heard several times 1400-1430 MDT 02 July 2017. RW-- ~1445 MDT with gusty outflow winds. Trace precip.
7/4/2017 7:00 AM T M M M M Rain sprinkles ~1740 MDT 03 July 2017. Trace precip. Gust outflow winds.
7/5/2017 7:00 AM 0.00 0.0 M M M
7/6/2017 7:00 AM 0.00 0.0 M M M
7/7/2017 7:00 AM 0.00 0.0 M M M
7/8/2017 7:00 AM 0.01 M M M M TRW-- ~1400 MDT 07 July 2017L with large drops and two nearby cloud-to-ground flashes. Trace precip. TRW- 1615-1630 MDT. Precip .01".
7/9/2017 7:00 AM T M M M M A few drops of rain around 1400 MDT 08 July 2017. Trace precip.
7/10/2017 7:00 AM 0.00 0.0 M M M
7/11/2017 7:00 AM 0.00 0.0 M M M
7/12/2017 7:00 AM T M M M M Brief sprinkles ~ 0600 MDT 12 July 2017. Trace precip.
7/13/2017 7:00 AM 0.02 M M M M Occasional very light sprinkles during the day, 12 July 2017 (trace precip). R-, small droplets 1700-1800 MDT. Precip 0.02".
7/14/2017 7:00 AM 0.00 0.0 M M M
7/15/2017 7:00 AM 0.00 0.0 M M M
7/16/2017 7:00 AM T M M M M A few drops of rain 1635-1640 MDT 15 July 2017. Trace precip.
7/17/2017 7:00 AM 0.00 0.0 M M M
7/18/2017 7:00 AM 0.00 0.0 M M M
7/19/2017 7:00 AM 0.00 0.0 M M M
7/20/2017 7:00 AM T M M M M Sprinkles of rain for a minute or two and gusty winds ~1700 MDT 19 July 2017. Trace precip.
7/21/2017 7:00 AM T M M M M Thunder rumbled barely audibly from 1445-1530 MDT 20 July 2017 in anvils overhead. A few drops of rain at 1520 and again 1530 MDT (trace precip). Sprinkles again ~2000 MDT (trace precip).
7/22/2017 7:00 AM 0.31 M M M M TRW- began 1555 MDT 21 July 2017. 0.27" fell by 1630 MDT, when rain ended. R- from 1800-2000 MDT (precip +.03") and again from 2200-2230 MDT (precip +.01"). 24-h total 0.31".
7/23/2017 7:00 AM 0.00 0.0 M M M
7/24/2017 7:00 AM 0.00 0.0 M M M
7/25/2017 7:00 AM 0.00 0.0 M M M
7/26/2017 7:00 AM 0.05 M M M M RW-- 0855-0905 MDT 25 July 2017 (trace precip). Intermittent RW-- began 1655 MDT,then R- 1845-1930 MDT (precip .04). R- again 2200-2230 MDT (precip +.01)
7/27/2017 7:00 AM 0.83 M M M M RW- 1720-1740 MDT 26 July 2017 (precip .01"). R-- began again 1905 MDT. Thunder heard twice 1940-1950 MDT. RW+ began 1955 MDT. One rumble of thunder 2015 MDT with RW continuing. Precip +.76 by 2023 MDT. Rain ended 2035 MDT. More rain 2100-2200 MDT (precip +.06). 24-h total 0.83"
7/28/2017 7:00 AM 0.00 0.0 M M M
7/29/2017 7:00 AM 0.36 M M M M TRW 1630-1700 MDT 28 July 2017 (precip 0.36").
7/30/2017 7:00 AM 0.01 M M M M R-- in progress at start of observing period (0700 MDT 29 July 2017). This continued until 0930 MDT. Precip .01". R-- again 1430-1500 MDT (trace precip).
7/31/2017 7:00 AM T M M M M Light rain sprinkles ~1400 MDT 30 July 2017. Trace precip. A few drops of rain ~1800 MDT. Trace precip.
8/1/2017 7:00 AM 0.00 0.0 M M M
8/2/2017 7:00 AM 0.00 0.0 M M M
8/3/2017 7:00 AM 0.12 M M M M TRW- 0155-0205 MDT 03 Mar 2017. Precip 0.12".
8/4/2017 7:00 AM T M M M M
8/5/2017 7:00 AM 0.13 M M M M
8/6/2017 7:00 AM 0.11 M M M M
8/7/2017 7:00 AM 0.09 M M M M
8/8/2017 7:00 AM 0.67 M M M M
8/9/2017 7:00 AM 0.07 M M M M
8/10/2017 7:00 AM 0.01 M M M M
8/11/2017 7:00 AM 0.07 M M M M
8/12/2017 7:00 AM 0.00 0.0 M M M
8/13/2017 7:00 AM 0.00 0.0 M M M
8/14/2017 7:00 AM 0.03 0.0 M M M RW- 1355-1430 MDT 13 Aug 2017. Precip .03".
8/15/2017 7:00 AM 0.00 0.0 M M M
8/16/2017 7:00 AM 0.04 M M M M RW-- 1345-1445 MDT 13 Aug 2017 and again 1500-1535 MDT. Trace precip both times. TRW- 1815-1900 MDT (precip .03"). RW- 1950-2015 MDT (precip +.01")
8/17/2017 7:00 AM 0.03 M M M M TRW- 1300-1315 MDT 16 Aug 2017 (precip .01"). Several cloud-to-ground flashes. Brief TRW- ~1430 MDT, lasting a few minutes (precip +.02")
8/18/2017 7:00 AM T M M M M RW-- 1345-1400 MDT 17 Aug 2017. Trace precip
8/19/2017 7:00 AM 0.00 0.0 M M M
8/20/2017 7:00 AM 0.00 0.0 M M M
8/21/2017 7:00 AM 0.00 0.0 M M M
8/22/2017 7:00 AM 0.00 0.0 M M M
8/23/2017 7:00 AM 0.00 0.0 M M M
8/24/2017 7:00 AM T M M M M RW-- ~1400 MDT 23 Aug 2017 (trace precip). RW--1810-1825 MDT, accompanied by outflow winds off foothills to 30 mph. Trace precip.
8/25/2017 7:00 AM T M M M M RW-- 1505 to 1545 MDT 24 Aug 2017, enough to dampen the pavement but not quite enough to measure. Trace precip.
8/26/2017 7:00 AM T M M M M A few drops of rain 1540-1545 MDT 25 Aug 2016, wouldn't have been noticed unless you were outside.
8/27/2017 7:00 AM 0.00 0.0 M M M
8/28/2017 7:00 AM 0.00 0.0 M M M
8/29/2017 7:00 AM 0.00 0.0 M M M
8/30/2017 7:00 AM 0.00 0.0 M M M
8/31/2017 7:00 AM T M M M M A few drops of rain ~1400 MDT 30 Aug 2017. Otherwise dry.
9/1/2017 7:00 AM 0.01 0.0 M 0.0 M Brief RW-- 1420 MDT and 1615 MDT 31 Aug 2017. Trace precip both times. RW-, just enough to wet pavement, 1725-1740L (precip .01", rounded up).
9/2/2017 7:00 AM 0.00 0.0 M 0.0 M
9/3/2017 7:00 AM 0.00 0.0 M 0.0 M
9/4/2017 7:00 AM 0.00 0.0 M 0.0 M
9/5/2017 7:00 AM 0.00 0.0 M 0.0 M
9/6/2017 7:00 AM 0.00 0.0 M 0.0 M
9/7/2017 7:00 AM 0.00 0.0 M 0.0 M
9/8/2017 7:00 AM 0.00 0.0 M 0.0 M
9/9/2017 7:00 AM 0.00 0.0 M 0.0 M
9/10/2017 7:00 AM 0.00 0.0 M 0.0 M
9/11/2017 7:00 AM T 0.0 M 0.0 M RW-- and gusty W to NW winds ~1615 MDT 10 Sep 2017. Trace precip.
9/12/2017 7:00 AM 0.00 0.0 M 0.0 M
9/13/2017 7:00 AM 0.00 0.0 M 0.0 M
9/14/2017 7:00 AM 0.00 0.0 M 0.0 M
9/15/2017 7:00 AM 0.00 0.0 M 0.0 M
9/16/2017 7:00 AM 0.01 0.0 M 0.0 M Rain sprinkles ~2115 MDT 15 Sep 2017 followed frontal passage. Precip .01".
9/17/2017 7:00 AM 0.00 0.0 M 0.0 M
9/18/2017 7:00 AM T 0.0 M 0.0 M Rain sprinkles 1415-1445 MDT 17 Sep 2017. Trace precip.
9/19/2017 7:00 AM 0.00 0.0 M 0.0 M
9/20/2017 7:00 AM 0.00 0.0 M 0.0 M
9/21/2017 7:00 AM 0.00 0.0 M 0.0 M
9/22/2017 7:00 AM 0.00 0.0 M 0.0 M
9/23/2017 7:00 AM 0.00 0.0 M 0.0 M
9/24/2017 7:00 AM 0.97 0.0 M 0.0 M RW- 1215-1230 MDT 23 Sep 2017L brought a few hundredths pcpn. RW- again 1430-1530 MDT, then R-. At 1600 MDT, R-,.13" pcpn so far(not emptied). RW began 1605L. Dark. R, ocnly R+, for next several hours. As of 1920 MDT, 0.93" in gauge (not emptied) and R-. Little rainfall after that for the rest of the night (+.04).
9/25/2017 7:00 AM 0.09 0.0 M 0.0 M Occasional drizzle during the morning of 24 Sep 2017. Continuous drizzle with occasional light rain from 1500 thru 2100 MDT. Precip .09". Very light drizzle at times for the rest of the night (trace precip).
9/26/2017 7:00 AM 0.03 0.0 M 0.0 M Very light drizzle began 1500 MDT 25 Sep 2017, then drizzle or light rain 1530-1630 MDT, precip .02". An additional .01" precip fell in late evening or overnight, time unknown.
9/27/2017 7:00 AM 0.02 0.0 M 0.0 M RW- 2115-2145 MDT 26 Sep 2017. Precip .02".
9/28/2017 7:10 AM 0.33 0.0 M 0.0 M Intermittent drizzle or R- started about 1100 MDT 27 Sep 2017 and lasted thru 1600 MDT (precip .05"). R-RW- began ~2330 MDT 27 Sep and continued thru observation time at 0710 MDT 28 Sep. Precip +.28". 14-h total .33".
9/29/2017 7:00 AM 0.06 0.0 M 0.0 M R- in progress at start of observation period (0710 MDT 28 Sep), ended at 0830 MDT. Precip .01". RW- 2100-2230 MDT (precip +.05").
9/30/2017 7:00 AM 0.07 0.0 M 0.0 M TRW- (only one rumble of thunder) 2015-2030 MDT 29 Sep 2017. Precip .07".



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground