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 10 1.39 0.91 31 0.91 31 0.00 0 0 6 5 0.0 0 0
Nov 10 1.04 0.56 30 0.56 30 0.00 0 0 6 6 1.8 4 4
Dec 10 0.79 0.41 31 0.41 31 0.00 0 0 5 2 7.9 3 3
Jan 11 0.64 0.79 31 0.79 31 0.00 0 0 4 3 14.3 3 16
Feb 11 0.63 0.98 28 0.98 28 0.00 0 0 9 4 12.2 8 15
March 11 1.86 0.33 31 0.33 31 0.00 0 0 6 3 0.8 1 1
April 11 2.34 2.20 30 2.20 30 0.00 0 0 11 5 3.3 2 2
May 11 2.66 5.01 31 5.01 31 0.00 0 0 12 4 0.0 0 0
June 11 2.16 1.07 30 1.07 30 0.00 0 0 6 1 0.0 0 0
July 11 1.67 3.40 31 3.40 31 0.00 0 0 14 5 0.0 0 0
Aug 11 1.76 0.84 31 0.84 31 0.00 0 0 7 7 0.0 0 0
Sept 11 1.61 2.65 30 2.65 30 0.00 0 0 8 1 0.0 0 0
Water Year Totals: 18.55" 19.15" 365 days 19.15" 365 0.00" 0 days 0 94 days 46 days 40.3" 21 days 41 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
10/1/2010 0.00
10/2/2010 0.00
10/3/2010 0.00
10/4/2010 0.00
10/5/2010 T
10/6/2010 0.00
10/7/2010 0.03
10/8/2010 T
10/9/2010 0.00
10/10/2010 0.00
10/11/2010 0.11
10/12/2010 0.20
10/13/2010 0.35
10/14/2010 0.00
10/15/2010 0.00
10/16/2010 0.00
10/17/2010 0.00
10/18/2010 T
10/19/2010 0.03
10/20/2010 0.00
10/21/2010 0.00
10/22/2010 0.00
10/23/2010 0.19
10/24/2010 0.00
10/25/2010 T
10/26/2010 T
10/27/2010 0.00
10/28/2010 0.00
10/29/2010 0.00
10/30/2010 0.00
10/31/2010 0.00
11/1/2010 0.04
11/2/2010 0.00
11/3/2010 0.00
11/4/2010 0.00
11/5/2010 0.00
11/6/2010 0.00
11/7/2010 0.00
11/8/2010 T
11/9/2010 0.00
11/10/2010 0.32
11/11/2010 0.10
11/12/2010 0.03
11/13/2010 0.00
11/14/2010 T
11/15/2010 T
11/16/2010 T
11/17/2010 0.04
11/18/2010 0.00
11/19/2010 0.00
11/20/2010 0.00
11/21/2010 0.00
11/22/2010 0.03
11/23/2010 0.00
11/24/2010 0.00
11/25/2010 T
11/26/2010 0.00
11/27/2010 0.00
11/28/2010 0.00
11/29/2010 T
11/30/2010 0.00
12/1/2010 0.00
12/2/2010 0.00
12/3/2010 0.00
12/4/2010 0.00
12/5/2010 0.00
12/6/2010 0.00
12/7/2010 T
12/8/2010 0.00
12/9/2010 0.00
12/10/2010 0.00
12/11/2010 0.01
12/12/2010 0.00
12/13/2010 0.00
12/14/2010 0.00
12/15/2010 0.00
12/16/2010 0.01
12/17/2010 0.01
12/18/2010 0.02
12/19/2010 0.00
12/20/2010 0.00
12/21/2010 T
12/22/2010 0.00
12/23/2010 0.00
12/24/2010 0.00
12/25/2010 0.00
12/26/2010 0.00
12/27/2010 0.00
12/28/2010 0.00
12/29/2010 0.00
12/30/2010 0.00
12/31/2010 0.36
Day of YearDaily PrcpMultiday Prcp
1/1/2011 0.00
1/2/2011 0.00
1/3/2011 0.00
1/4/2011 0.00
1/5/2011 0.00
1/6/2011 0.00
1/7/2011 0.00
1/8/2011 0.00
1/9/2011 0.01
1/10/2011 0.51
1/11/2011 0.00
1/12/2011 0.00
1/13/2011 0.00
1/14/2011 0.00
1/15/2011 0.00
1/16/2011 0.00
1/17/2011 T
1/18/2011 T
1/19/2011 0.00
1/20/2011 0.25
1/21/2011 0.00
1/22/2011 0.00
1/23/2011 0.00
1/24/2011 0.00
1/25/2011 0.00
1/26/2011 T
1/27/2011 0.00
1/28/2011 0.00
1/29/2011 0.00
1/30/2011 0.00
1/31/2011 0.02
2/1/2011 0.08
2/2/2011 0.01
2/3/2011 0.00
2/4/2011 0.03
2/5/2011 T
2/6/2011 0.53
2/7/2011 0.01
2/8/2011 0.19
2/9/2011 0.07
2/10/2011 0.00
2/11/2011 0.00
2/12/2011 0.00
2/13/2011 0.00
2/14/2011 0.00
2/15/2011 0.00
2/16/2011 0.00
2/17/2011 0.00
2/18/2011 0.00
2/19/2011 0.00
2/20/2011 T
2/21/2011 0.00
2/22/2011 0.00
2/23/2011 0.00
2/24/2011 T
2/25/2011 0.03
2/26/2011 0.03
2/27/2011 0.00
2/28/2011 T
3/1/2011 0.00
3/2/2011 0.00
3/3/2011 0.00
3/4/2011 0.00
3/5/2011 0.00
3/6/2011 0.00
3/7/2011 0.01
3/8/2011 0.02
3/9/2011 0.00
3/10/2011 0.00
3/11/2011 0.00
3/12/2011 0.00
3/13/2011 0.10
3/14/2011 0.00
3/15/2011 0.00
3/16/2011 0.00
3/17/2011 0.00
3/18/2011 0.03
3/19/2011 0.00
3/20/2011 0.00
3/21/2011 0.00
3/22/2011 0.02
3/23/2011 T
3/24/2011 0.00
3/25/2011 T
3/26/2011 0.00
3/27/2011 0.00
3/28/2011 T
3/29/2011 0.15
3/30/2011 0.00
3/31/2011 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2011 0.00
4/2/2011 0.00
4/3/2011 0.00
4/4/2011 0.22
4/5/2011 0.00
4/6/2011 T
4/7/2011 T
4/8/2011 0.00
4/9/2011 0.00
4/10/2011 0.07
4/11/2011 0.00
4/12/2011 0.00
4/13/2011 0.00
4/14/2011 1.15
4/15/2011 T
4/16/2011 0.00
4/17/2011 0.00
4/18/2011 0.00
4/19/2011 0.24
4/20/2011 0.01
4/21/2011 0.17
4/22/2011 0.05
4/23/2011 T
4/24/2011 0.05
4/25/2011 0.21
4/26/2011 0.01
4/27/2011 0.02
4/28/2011 0.00
4/29/2011 0.00
4/30/2011 T
5/1/2011 0.00
5/2/2011 T
5/3/2011 T
5/4/2011 0.00
5/5/2011 0.00
5/6/2011 0.00
5/7/2011 0.00
5/8/2011 0.00
5/9/2011 0.00
5/10/2011 0.00
5/11/2011 0.72
5/12/2011 0.80
5/13/2011 0.12
5/14/2011 0.00
5/15/2011 0.46
5/16/2011 0.04
5/17/2011 0.00
5/18/2011 0.05
5/19/2011 1.67
5/20/2011 0.53
5/21/2011 0.23
5/22/2011 T
5/23/2011 0.00
5/24/2011 0.15
5/25/2011 0.23
5/26/2011 0.00
5/27/2011 0.00
5/28/2011 0.00
5/29/2011 0.01
5/30/2011 0.00
5/31/2011 T
6/1/2011 0.00
6/2/2011 0.00
6/3/2011 0.00
6/4/2011 0.00
6/5/2011 0.00
6/6/2011 0.00
6/7/2011 0.00
6/8/2011 0.00
6/9/2011 0.09
6/10/2011 0.03
6/11/2011 0.00
6/12/2011 T
6/13/2011 0.00
6/14/2011 0.00
6/15/2011 0.00
6/16/2011 0.00
6/17/2011 0.00
6/18/2011 0.00
6/19/2011 0.00
6/20/2011 0.85
6/21/2011 0.04
6/22/2011 0.00
6/23/2011 0.00
6/24/2011 0.01
6/25/2011 0.00
6/26/2011 0.00
6/27/2011 0.00
6/28/2011 0.00
6/29/2011 0.00
6/30/2011 0.05
Day of YearDaily PrcpMultiday Prcp
7/1/2011 0.12
7/2/2011 0.02
7/3/2011 0.00
7/4/2011 T
7/5/2011 0.00
7/6/2011 0.02
7/7/2011 0.04
7/8/2011 1.71
7/9/2011 0.00
7/10/2011 0.64
7/11/2011 0.39
7/12/2011 0.15
7/13/2011 0.10
7/14/2011 T
7/15/2011 0.04
7/16/2011 T
7/17/2011 0.00
7/18/2011 0.00
7/19/2011 0.00
7/20/2011 0.04
7/21/2011 0.08
7/22/2011 0.00
7/23/2011 T
7/24/2011 0.00
7/25/2011 0.00
7/26/2011 0.00
7/27/2011 0.01
7/28/2011 0.04
7/29/2011 0.00
7/30/2011 T
7/31/2011 0.00
8/1/2011 0.08
8/2/2011 0.00
8/3/2011 0.05
8/4/2011 0.00
8/5/2011 0.00
8/6/2011 0.00
8/7/2011 0.00
8/8/2011 0.00
8/9/2011 0.00
8/10/2011 0.00
8/11/2011 0.00
8/12/2011 T
8/13/2011 0.00
8/14/2011 0.00
8/15/2011 0.06
8/16/2011 0.00
8/17/2011 0.45
8/18/2011 T
8/19/2011 0.00
8/20/2011 0.17
8/21/2011 T
8/22/2011 0.00
8/23/2011 0.02
8/24/2011 0.00
8/25/2011 0.00
8/26/2011 T
8/27/2011 T
8/28/2011 T
8/29/2011 0.01
8/30/2011 0.00
8/31/2011 T
9/1/2011 0.00
9/2/2011 0.01
9/3/2011 T
9/4/2011 0.00
9/5/2011 0.00
9/6/2011 0.00
9/7/2011 0.27
9/8/2011 0.65
9/9/2011 0.00
9/10/2011 0.00
9/11/2011 0.00
9/12/2011 0.00
9/13/2011 0.01
9/14/2011 0.02
9/15/2011 1.63
9/16/2011 0.01
9/17/2011 0.00
9/18/2011 0.00
9/19/2011 0.00
9/20/2011 0.00
9/21/2011 0.00
9/22/2011 0.05
9/23/2011 0.00
9/24/2011 0.00
9/25/2011 0.00
9/26/2011 0.00
9/27/2011 0.00
9/28/2011 0.00
9/29/2011 0.00
9/30/2011 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2010 7:00 AM 0.00 0.0 M 0.0 M
10/2/2010 7:00 AM 0.00 0.0 M 0.0 M
10/3/2010 7:00 AM 0.00 0.0 M 0.0 M
10/4/2010 7:00 AM 0.00 0.0 M 0.0 M
10/5/2010 7:00 AM T 0.0 M 0.0 M Brief RW--, just a few drops, and breezy 1420 MDT 04 Oct 2010. Trace precip.
10/6/2010 7:00 AM 0.00 0.0 M 0.0 M
10/7/2010 7:00 AM 0.03 0.0 M 0.0 M RW- from 0015 to 0115 MDT 07 Oct 2010. Precip .03".
10/8/2010 7:00 AM T 0.0 M 0.0 M A few sprinkles ~0545 MDT 08 Oct 2010. Trace precip.
10/9/2010 7:00 AM 0.00 0.0 M 0.0 M
10/10/2010 7:00 AM 0.00 0.0 M 0.0 M
10/11/2010 7:00 AM 0.11 0.0 M 0.0 M Occasional RW- from 1000-1600 MDT 10 Oct 2010. Precip only .01". More substantial scattered showers on the evening of 10 Oct, from 1910 to 2330 MDT. Precip +.10" for a 24-h total of .11".
10/12/2010 7:00 AM 0.20 0.0 M 0.0 M RW- begam 0430 MDT 12 Oct 2010, became moderate rain ~0530L, and was still falling at obs time (0700 MDT). Precip so far .20".
10/13/2010 7:00 AM 0.35 0.0 M 0.0 M Moderate rain at time of observation, 0700 MDT 12 Oct 2010, becoming light by 0900 MDT. Light rain ended 1010 MDT. Precip .35".
10/14/2010 7:00 AM 0.00 0.0 M 0.0 M
10/15/2010 7:00 AM 0.00 0.0 M 0.0 M
10/16/2010 7:00 AM 0.00 0.0 M 0.0 M
10/17/2010 7:00 AM 0.00 0.0 M 0.0 M
10/18/2010 7:00 AM T 0.0 M 0.0 M A few drops of rain ~1900 MDT 17 Oct 2010. Trace precip.
10/19/2010 7:00 AM 0.03 0.0 M 0.0 M Intermittent R- began ~1700 MDT, continued until 2200 MDT 18 Oct 2010. Precip .03".
10/20/2010 7:00 AM 0.00 0.0 M 0.0 M
10/21/2010 7:00 AM 0.00 0.0 M 0.0 M
10/22/2010 7:00 AM 0.00 0.0 M 0.0 M
10/23/2010 7:00 AM 0.19 0.0 M 0.0 M Precip fell at the following times 22 Oct 2010: RW- and BB-size hail 0910-0925 MDT (.07"), RW- 1330-1410 MDT (+.01"), and RW/R- 1550-1630 MDT and 1700-1730 MDT (+.11"). Total precip for the day .19".
10/24/2010 7:00 AM 0.00 0.0 M 0.0 M
10/25/2010 7:00 AM T 0.0 M 0.0 M Light sprinkles just before obs time (0700 MDT 25 Oct 2010). Precip was a trace in blow over from the Divide in downslope flow.
10/26/2010 7:00 AM T 0.0 M 0.0 M A few sprinkles during downslope flow (spill-over from the Divide) in progress at the start of the observing period, ended by 0830 MDT 25 Oct 2010. Trace precip.
10/27/2010 7:00 AM 0.00 0.0 M 0.0 M
10/28/2010 7:00 AM 0.00 0.0 M 0.0 M
10/29/2010 7:00 AM 0.00 0.0 M 0.0 M
10/30/2010 7:00 AM 0.00 0.0 M 0.0 M
10/31/2010 7:00 AM 0.00 0.0 M 0.0 M
11/1/2010 7:00 AM 0.04 0.0 M 0.0 M RW- between 0500 and 0600 MDT 01 Nov 2010. Precip .04"
11/2/2010 7:00 AM 0.00 0.0 M 0.0 M
11/3/2010 7:00 AM 0.00 0.0 M 0.0 M
11/4/2010 7:00 AM 0.00 0.0 M 0.0 M
11/5/2010 7:00 AM 0.00 0.0 M 0.0 M
11/6/2010 7:00 AM 0.00 0.0 M 0.0 M
11/7/2010 7:00 AM 0.00 0.0 M 0.0 M
11/8/2010 7:00 AM T 0.0 M 0.0 M Very sharp mid-tropospheric trough line and sudden wind shift brought midday showers on 07 Nov 2010, despite dew point in the mid 20s. RW-- 1300-1315 MST. Trace precip. Sunny both before and after.
11/9/2010 7:00 AM 0.00 0.0 M 0.0 M
11/10/2010 7:00 AM 0.32 0.3 M 0.2 M RW- began 1110 MST 09 Nov 2010 became R- and continued to 1305 MST. Precip .19". R- resumed 1430 MST (+.01"), quickly changed to snow, fell moderately 1500-1530 MST, then tapered off and ended by 1615 MST (+.12"). First measurable snow of the season deposited 0.3" on the grass. 0.2" still there at obs time. 24-h precip .32".
11/11/2010 7:00 AM 0.10 1.1 M 1.1 M Remaining 0.2" snow cover melted the afternoon of 10 Nov 2010. A few SW-- ~2100 MST 10 Nov (trace). S- began before 0400 MST 11 Nov, with an estimated 0.2" accumulation by that time. At obs time (0700 MST), S-, one mile visibility, accumulation 1.1", precip .10".
11/12/2010 7:00 AM 0.03 0.1 M 0.5 M S- at start of observing period ended by 1000 MST 11 Nov 2010. Only 0.1" new accumulation. Maximum on ground 1.2" at 0900 MST. At obs time snow cover is down to 0.5", except under trees, where ground is bare.
11/13/2010 7:00 AM 0.00 0.0 M T M Snow remains only in shady areas.
11/14/2010 7:00 AM T 0.0 M 0.0 M Brief SW--/SW- 1645-1770L. No accumulation. Trace precip.
11/15/2010 7:00 AM T T M T M SW-- began 0645L, increased to SW- at obs time. Just a dusting of snow on the grass and a trace precip.
11/16/2010 7:00 AM T T M 0.0 M Occasional snow showers, mostly very light, at the beginning of the observation period, ending by 1000 MST 15 Nov 2010. Trace of snow on the grass, only briefly, and trace precip.
11/17/2010 7:00 AM 0.04 0.0 M 0.0 M Light sprinkles of rain 1200-1400 MST 16 Nov 2010, blowing over from Divide in westerly flow. Trace precip. RW- changing very briefly to SW- at the end, 1515-1540 MST. Precip .04". Light drizzle / very light snow late in the evening 16 Nov 2010. Trace precip.
11/18/2010 7:00 AM 0.00 0.0 M 0.0 M
11/19/2010 7:00 AM 0.00 0.0 M 0.0 M
11/20/2010 7:00 AM 0.00 0.0 M 0.0 M
11/21/2010 7:00 AM 0.00 0.0 M 0.0 M
11/22/2010 7:00 AM 0.03 0.3 M 0.2 M SW--, just a few small graupel pellets from time to time between late morning and mid-afternoon 21 Nov 2010. Trace precip. SW- 2100-2130 MST 21 Nov. Accumulation 0.3", precip .03". This snow is slowly melting and evaporating at obs time in downslope winds with the temperature near 34 deg F.
11/23/2010 7:00 AM 0.00 0.0 M T M A dusting of snow remains in shaded areas.
11/24/2010 7:00 AM 0.00 0.0 M 0.0 M
11/25/2010 7:00 AM T 0.0 M 0.0 M A few flakes of snow between 1000 and 1300 MST on 24 Nov 2010. Trace precip. Zero accumulation.
11/26/2010 7:00 AM 0.00 0.0 M 0.0 M
11/27/2010 7:00 AM 0.00 0.0 M 0.0 M
11/28/2010 7:00 AM 0.00 0.0 M 0.0 M
11/29/2010 7:00 AM T 0.0 M 0.0 M A few flakes of snow 1600-1800 MST with temperature in the upper 30s F. Trace precipitation. Snow melted on contact with ground.
11/30/2010 7:00 AM 0.00 0.0 M 0.0 M
12/1/2010 7:00 AM 0.00 0.0 M 0.0 M
12/2/2010 7:00 AM 0.00 0.0 M 0.0 M
12/3/2010 7:00 AM 0.00 0.0 M 0.0 M
12/4/2010 7:00 AM 0.00 0.0 M 0.0 M
12/5/2010 7:00 AM 0.00 0.0 M 0.0 M
12/6/2010 7:00 AM 0.00 0.0 M 0.0 M
12/7/2010 7:00 AM T T M 0.0 M Brief shower of a few snow flakes and pellets late evening, 06 December 2010. Trace precip. Trace accumulation on parked cars.
12/8/2010 7:00 AM 0.00 0.0 M 0.0 M
12/9/2010 7:00 AM 0.00 0.0 M 0.0 M
12/10/2010 7:00 AM 0.00 0.0 M 0.0 M
12/11/2010 7:00 AM 0.01 0.0 M 0.0 M R- 1700-1800 MST 10 Dec 2010. Precip .01".
12/12/2010 7:00 AM 0.00 0.0 M 0.0 M
12/13/2010 7:00 AM 0.00 0.0 M 0.0 M
12/14/2010 7:00 AM 0.00 0.0 M 0.0 M
12/15/2010 7:00 AM 0.00 0.0 M 0.0 M
12/16/2010 7:00 AM 0.01 0.0 M 0.0 M RW- 1540-1610 MST 15 Dec 2010. Precip .01".
12/17/2010 7:00 AM 0.01 0.3 M 0.3 M A few flakes of snow in the air ~2000 MST 16 Dec 2010. S- began early 17 Dec, best guess at 0300 MST, continuing thru obs time at 0700 MST, at which time the accumulation was 0.3" and the water content .01". Stellar crystals produced very fluffy snow.
12/18/2010 7:00 AM 0.02 0.6 M 0.5 M Light snow in progress at 0700 MST 17 Dec 2010. Light or very light snow continued until 1400 MST, with sun briefly visible during mid morning. New snow accumulation 0.6". Most observed on the snow board 0.9". Precip 0700-1400 MST 0.02". 0.5" accumulation remains at 0700 MST 18 Dec 2010.
12/19/2010 7:00 AM 0.00 0.0 M T M Light coating of snow remains in shaded areas.
12/20/2010 7:00 AM 0.00 0.0 M 0.0 M
12/21/2010 7:00 AM T 0.0 M 0.0 M A few drops of rain fell in parts of Boulder shortly after 0700 MST 20 Dec 2010. Trace precip.
12/22/2010 7:00 AM 0.00 0.0 M 0.0 M
12/23/2010 7:00 AM 0.00 0.0 M 0.0 M
12/24/2010 7:00 AM 0.00 0.0 M 0.0 M
12/25/2010 7:00 AM 0.00 0.0 M 0.0 M
12/26/2010 7:00 AM 0.00 0.0 M 0.0 M
12/27/2010 7:00 AM 0.00 0.0 M 0.0 M
12/28/2010 7:00 AM 0.00 0.0 M 0.0 M
12/29/2010 7:00 AM 0.00 0.0 M 0.0 M
12/30/2010 7:00 AM 0.00 0.0 M 0.0 M
12/31/2010 7:00 AM 0.36 7.0 M 6.5 M Intermittent SW- began 0730 MST 30 Dec 2010. A dusting by 0800 MST. Steady S- began 0840 MST, heavily rimed at first. Frontal passage at 0920 MST marked beginning of occasionally moderate snow (visibility 1/2 to 3/4 mile), continuous until 1030 MST, then S-3/4. S-- 1200-1430 MST, then resumption of measurable snow at 1430 MST, this time fluffy dendrites. S1/2 1500-1730 MST, then S-, slowly tapering off during the evening. At 2110 MST, S-1, accumulation 7.0" (max measured), precip .29. S-- still sifting down at 0200 MST 31 Dec, probably ending by 0300 MST. Additional precip .07", tiny crystals, much more dense than afternoon snowfall. Snow settled so that by observation time (0700 MST 31 Dec) depth was down to 6.5". Min temperature the morning of 31 Dec was 4 deg F.
1/1/2011 7:00 AM 0.00 0.0 M 4.5 M
1/2/2011 7:00 AM 0.00 0.0 M 4.0 M
1/3/2011 7:00 AM 0.00 0.0 M 3.0 M
1/4/2011 7:00 AM 0.00 0.0 M 2.5 M
1/5/2011 7:00 AM 0.00 0.0 M 2.5 M Small bare spots have appeared beneath trees. Otherwise continuous snow cover, 2.5"
1/6/2011 7:00 AM 0.00 0.0 M 2.0 M Bare spots showing under trees. Rest of ground still covered by about 2" of snow.
1/7/2011 7:00 AM 0.00 0.0 M T M Continuous snow cover disappeared ~1600 MST 06 Jan 20100 as temperature reached mid 50s. Snow remains in shaded areas.
1/8/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/9/2011 7:00 AM 0.01 0.1 M 0.1 M S- began 0630 MST 09 Jan 2011. By obs time (0700 MST), 0.1" accumulation, .01" precip.
1/10/2011 7:00 AM 0.51 9.4 M 9.5 M S-, occasionally S, continued throughout most of the observing period, ending ~0500 MST Mon 10 Jan. Accumulation on ground 9.5".
1/11/2011 7:00 AM 0.00 0.0 M 7.0 M
1/12/2011 7:00 AM 0.00 0.0 M 6.0 M
1/13/2011 7:00 AM 0.00 0.0 M 5.0 M
1/14/2011 7:00 AM 0.00 0.0 M 2.5 M
1/15/2011 7:00 AM 0.00 0.0 M 0.5 M 0.5" snow remains at 0700 MST 15 Jan 2011 with 60% coverage in unshaded areas.
1/16/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/17/2011 7:00 AM T 0.0 M T M RW-- began a few minutes before obs time (0700 MST 17 Jan 2011). Sprinkles continue, enough to dampen the pavement, but only a trace precip. Snow remains in shaded areas.
1/18/2011 7:00 AM T 0.0 M T M RW-- for a few minutes after 0700 MST 17 Jan 2011 (about 24 hours ago). Trace precip. Patchy snow remains in shaded areas.
1/19/2011 7:00 AM 0.00 0.0 M T M Patchy snow remains in well shaded areas.
1/20/2011 7:00 AM 0.25 4.8 M 4.8 M Quick frontal passage during the noon hour 19 Jan 2011 was soon followed by snow. A few flakes in the air by 1400 MST, but snow began in earnest at 1410 MST, moderate or heavy. Estimated 3.5" fell between 1500 and 1630 MST. Only S- or S-- after 1630 MST with little additional accumulation. Snow ended late on 19 Jan. Max accumulation on ground 4.8" with a water content of .25".
1/21/2011 7:00 AM 0.00 0.0 M 2.0 M
1/22/2011 7:00 AM 0.00 0.0 M 0.5 M
1/23/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/24/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/25/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas
1/26/2011 7:00 AM T M M T M A few flakes of snow in the air ~2200 MST, 25 Jan 2011. Unsure how long it lasted, but no accumulation and a trace of precipitation. Snow remains in shaded areas.
1/27/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/28/2011 7:00 AM 0.00 0.0 M T M Patchy snow remains in well shaded areas.
1/29/2011 7:00 AM 0.00 0.0 M 0.0 M Yesterday's downslope breezes and max of 67 deg F took care of the remaining snow in shaded areas.
1/30/2011 7:00 AM 0.00 0.0 M 0.0 M
1/31/2011 7:10 AM 0.02 T M T M Light freezing drizzle began ~0300 MST 31 Jan 2011, becoming mixed with rimed snow grains ~0645 MST. At obs time, 0710 MST, thin veneer of ice on pavement and a trace of snow on top. Precip .02" but still in progress.
2/1/2011 7:00 AM 0.08 1.4 M 1.4 M Mixture of freezing drizzle and snow grains at start of observation period became all snow at 0810 MST 31 Jan 2011. S-3/4 0810 until 0930 MST, then S-- thru early afternoon. S-, 3/4 to 1 mile visibility, 1330 to 1530 MST, then S-- or ice crystals through the evening and night. 1.1" snow accumulated between 0710 and 1900 MST with a water content of only .05". Very light snow through the night amounted to 0.3" more accumulation and a water content of 0.03". Ice crystals still in the air at obs time.
2/2/2011 7:00 AM 0.01 0.0 M 1.0 M SW- 1600-1645 MST 01 Feb 2011. Precip .01". New snow accumulation 0.1". At obs time (0700 MST 02 Feb), 1.0" snow remains. Min temperature just before obs time -16F.
2/3/2011 7:00 AM 0.00 0.0 M 1.0 M
2/4/2011 7:00 AM 0.03 0.3 M 1.0 M Snow flakes in the air by noon 03 Feb 2011. SW- 1330-1430 MST and again ~1645 MST. Precip .03, new accumulation 0.2". Total on ground at obs time 1.0".
2/5/2011 7:00 AM T M M T M RW--, just a few drops, ~1400 MST 04 Feb 2011. Continuous snow cover ended by late afternoon 04 Feb.
2/6/2011 6:50 AM 0.53 6.0 M 6.0 M SW, visibility 3/8 to 5/8 1430-1600 MST 05 Feb 2011. Precip .10", accumulation 0.8", possibly starting as rain, but only briefly. S-3/4 1930 to 2130 MST brought perhaps 0.1" more accumulation. Mostly steady snow with embedded showers began after 2300 MST 05 Feb and continued most of the night. At 6:50 a.m. (obs time) on 06 Feb, 6.0" on the ground, 5.2" since 1600 MST 05 Feb with a water content of 0.43". S-3/4 still falling.
2/7/2011 7:00 AM 0.01 0.1 M 4.5 M S- 0650 MST 06 Feb 2011(obs time), ending by 0720 MST. Precip .01". New accumulation 0.1".
2/8/2011 7:10 AM 0.19 3.0 M 7.3 M Snow began 2115 MST 07 Feb 2011. Brief SW+1/4 (5 min) with arrival of Arctic front at 2120 MST. Then S- the rest of the night thru obs time this morning. 3.0" new accumulation with total on the ground 7.3".
2/9/2011 7:00 AM 0.07 0.5 M 6.5 M Light snow tapered off very slowly during the morning of 08 Feb 2011. No accumulation after noon. S-- ended at 1530 MST. Precip since 0710 MST .07. New accumulation 0.5" Max depth 7.8 late morning. Daytime max 11F.
2/10/2011 7:00 AM 0.00 0.0 M 6.0 M 6.0" of snow remains at obs time. No melting yet.
2/11/2011 7:00 AM 0.00 0.0 M 6.0 M Virtually no melting yesterday. 6.0" of snow remains on the ground.
2/12/2011 7:00 AM 0.00 0.0 M 5.0 M 5.0" of snow on ground at obs time.
2/13/2011 7:00 AM 0.00 0.0 M 4.5 M 4.5" of snow on the ground at obs time.
2/14/2011 7:00 AM 0.00 0.0 M 1.0 M 1.0" of crusty snow remains on ground at obs time, but coverage is down to 60% in open areas.
2/15/2011 7:00 AM 0.00 0.0 M T M Snow cover dropped below 50% in open areas during the afternoon of 14 Feb 2011. Snow remains in shaded areas at obs time.
2/16/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
2/17/2011 7:00 AM 0.00 0.0 M 0.0 M Last traces of snow melted the afternoon of 16 Feb 2011 as temperature reached 67 deg F.
2/18/2011 7:00 AM 0.00 0.0 M 0.0 M
2/19/2011 7:00 AM 0.00 0.0 M 0.0 M
2/20/2011 7:00 AM T 0.0 M 0.0 M RW-- (small drops) 1815-1845 MST 19 Feb 2011. Trace precip.
2/21/2011 7:00 AM 0.00 0.0 M 0.0 M
2/22/2011 7:00 AM 0.00 0.0 M 0.0 M
2/23/2011 7:00 AM 0.00 0.0 M 0.0 M
2/24/2011 7:00 AM T 0.0 M 0.0 M A few flakes of snow in the air in the few minutes before observation time this morning. Trace precip. No accumulation.
2/25/2011 7:00 AM 0.03 0.6 M 0.6 M S- began, best guess, at 0330 MST 25 Feb 2011, somewhat showery. At obs time S-2, 15 deg F, accumulation 0.6", precip so far .03".
2/26/2011 7:00 AM 0.03 0.3 M 0.5 M S-- with occasional SW- from 0700 MST 25 Feb 2011 until mid afternoon. Precip .03". Additional accumulation 0.3". 0.5" still on the ground at obs time.
2/27/2011 7:00 AM 0.00 0.0 M 0.0 M Snow on ground melted by late morning 26 Feb 2011.
2/28/2011 7:00 AM T 0.0 M 0.0 M Brief RW-- around 2015 MST 27 Feb 2011. Trace precip.
3/1/2011 7:00 AM 0.00 0.0 M 0.0 M
3/2/2011 7:00 AM 0.00 0.0 M 0.0 M
3/3/2011 7:00 AM 0.00 0.0 M 0.0 M
3/4/2011 7:00 AM 0.00 0.0 M 0.0 M
3/5/2011 7:00 AM 0.00 0.0 M 0.0 M
3/6/2011 7:00 AM 0.00 0.0 M 0.0 M
3/7/2011 7:00 AM 0.01 0.0 M 0.0 M Freezing drizzle began early on 07 Mar 2011, best guess, about 0400 MST. A very few snow grains mixed in. This continued at obs time. Precip .01. No accumulation.
3/8/2011 7:00 AM 0.02 T M T M Light freezing drizzle with a few snow grains fell most of the morning of 07 Mar 2011. Precip .01". A few snow grains late in the afternoon and evening and again early on 08 March before daybreak. Precip +.01" for a 24-h total of .02". Never more than a trace of snow on the ground--a dusting.
3/9/2011 7:00 AM 0.00 0.0 M 0.0 M
3/10/2011 7:00 AM 0.00 0.0 M 0.0 M
3/11/2011 7:00 AM 0.00 0.0 M 0.0 M
3/12/2011 7:00 AM 0.00 0.0 M 0.0 M
3/13/2011 7:00 AM 0.10 0.0 M 0.0 M RW- 0300-0320 MDT Sun 13 Mar 2010. Precip .10".
3/14/2011 7:00 AM 0.00 0.0 M 0.0 M
3/15/2011 7:00 AM 0.00 0.0 M 0.0 M
3/16/2011 7:00 AM 0.00 0.0 M 0.0 M
3/17/2011 7:00 AM 0.00 0.0 M 0.0 M
3/18/2011 7:00 AM 0.03 0.0 M 0.0 M RW-/SW- began 2140 MDT 17 Mar 2011. Other light showers later, probably all SW- after 0100 MDT 18 Mar. Precip ended ~0300 MDT. Total was .03". Snow melted as it hit the ground. No accumulation, not even a trace.
3/19/2011 7:00 AM 0.00 0.0 M 0.0 M
3/20/2011 7:00 AM 0.00 0.0 M 0.0 M
3/21/2011 7:00 AM 0.00 0.0 M 0.0 M
3/22/2011 7:00 AM 0.02 0.0 M 0.0 M RW- around 0300 MDT accompanied by gusty west winds. Precip .02".
3/23/2011 7:00 AM T 0.0 M 0.0 M A few flakes of snow in the air ~1220 MDT and again ~1830 MDT, 22 March 2011, the remnants of snowshowers coming off foothills in strong downslope flow. Temperature was in the low 40s both times, but lower atmosphere was very dry. Trace precip. No accumulation.
3/24/2011 7:00 AM 0.00 0.0 M 0.0 M
3/25/2011 7:00 AM T 0.0 M 0.0 M A few flakes of snow in the air at 1600 MDT 24 March 2011 with passage of mid-tropospheric trough, accompanied by strong, gusty west winds 25G45. Rapid clearing followed. Trace precip. No accumulation.
3/26/2011 7:00 AM 0.00 0.0 M 0.0 M
3/27/2011 7:00 AM 0.00 0.0 M 0.0 M
3/28/2011 7:00 AM T T M T M Light snow showers between 0600 and 0650 MDT 28 Mar 2010. Trace precipitation. Trace accumulation.
3/29/2011 7:00 AM 0.15 0.8 M 0.8 M RW- began ~1230 MDT 29 Mar 2011, changed to snow showers with small pellets mixed in ~1300 MDT, ending by 0245 MDT. Precip .15, accumulation 0.8. This was the first measurable snow of March at my location.
3/30/2011 7:00 AM 0.00 0.0 M 0.0 M Snow on the ground yesterday morning melted by mid afternoon 29 Mar 2011.
3/31/2011 7:00 AM 0.00 0.0 M 0.0 M
4/1/2011 7:00 AM 0.00 0.0 M 0.0 M
4/2/2011 7:00 AM 0.00 0.0 M 0.0 M
4/3/2011 7:00 AM 0.00 0.0 M 0.0 M 81 deg F max temperature on 2 April set a record for the date.
4/4/2011 7:00 AM 0.22 0.3 M 0.3 M RW-- began 1040 MDT 03 Apr 2011. RW- by 1200 MDT, ending 1330 MDT. Thunder heard several times shortly after noon. Precip to 1330 MDT .16". SG-- 1445 MDT, then SW-- 1545 MDT, then SW- at 1600 MDT, ending 1630 MDT. New precip +.02". Trace accumulation. SW- 1810-1830 and again 2030-2200 MDT. New precip +.04". Snow accumulation 0.3".
4/5/2011 7:00 AM 0.00 0.0 M 0.0 M
4/6/2011 7:00 AM T 0.0 M 0.0 M Slight drizzle began between 0600 and 0700 MDT 06 Apr 2011. Trace precip.
4/7/2011 7:00 AM T 0.0 M 0.0 M Slight drizzle, ending mid morning 06 Apr 2011. Trace precip. RW-- ~1700 MDT on 06 April. Pavement dampened but still only a trace of precip.
4/8/2011 7:00 AM 0.00 0.0 M 0.0 M
4/9/2011 7:00 AM 0.00 0.0 M 0.0 M
4/10/2011 7:00 AM 0.07 T M T M RW- began ~0145 MDT 10 Apr 2011, quickly changed to SPW-, then ended ~0230 MDT. 1/8" snow pellets. Trace accumulation. Precip .07".
4/11/2011 7:00 AM 0.00 0.0 M 0.0 M
4/12/2011 7:00 AM 0.00 0.0 M 0.0 M
4/13/2011 7:00 AM 0.00 0.0 M 0.0 M
4/14/2011 7:00 AM 1.15 3.0 M 3.0 M R- began 1900 MDT 13 Apr 2011, soon became moderate at times. Precip changed to snow ~0300 MDT 14 Apr and had accumulated to 3.0" by 0700 MDT 14 Apr. Total precip up to this time 1.15", but snow still continuing lightly.
4/15/2011 7:00 AM T T M 0.0 M Light snow ended by 0740 MDT 14 Apr 2011. Trace precip. Snow cover had melted by late afternoon 14 Apr.
4/16/2011 7:00 AM 0.00 0.0 M 0.0 M
4/17/2011 7:00 AM 0.00 0.0 M 0.0 M
4/18/2011 7:00 AM 0.00 0.0 M 0.0 M
4/19/2011 7:00 AM 0.24 0.0 M 0.0 M RW- began 2030 MDT, became R- by 2130 MDT and continued until 2300 MDT. Precip .24".
4/20/2011 7:00 AM 0.01 0.0 M 0.0 M RW- 2025-2035 MDT 19 Apr 2011. Precip .01",
4/21/2011 7:00 AM 0.17 0.0 M 0.0 M A few snow grains in the air ~0800 MDT 20 Apr 2011. Trace precip. R-- 1830-2000 MDT 20 Apr. Trace precip. RW- ~2100 MDT 20 Apr and again just before 2400 MDT. Estimated precip .03". RW began at 0640 MDT 21 Apr, with RW- continuing at obs time (0700 MDT). 24-h precip .17".
4/22/2011 7:00 AM 0.05 0.0 M 0.0 M RW-, in progress at start of observing period (0700 MDT, 21 Apr 2011), ended at 0715 MDT. Precip .02". RW- 2020-2040 MDT 21 Apr brought +.03" precip. 24-h total .05".
4/23/2011 7:00 AM T 0.0 M 0.0 M S-- began around 0630 MDT 23 Apr 2011, continuing at obs time. Trace precip. Nothing on the ground.
4/24/2011 7:00 AM 0.05 T M 0.0 M S-- in progress at 0700 MST 23 Apr became S- 0800-1000 MDT, then decreased and ended by 1030 MDT. Precip .05". Snow did not stick even to grass but was visible for a time on rooftops and shrub leaves. Trace accumulation. RW-- 2230-2330 MDT 23 Apr 2011. Trace precip.
4/25/2011 7:00 AM 0.21 0.0 M 0.0 M RW- 1730-1900 MDT 24 Apr 2011 (precip .12") and again 2145-2345 MDT (precip +.09").
4/26/2011 7:00 AM 0.01 0.0 M 0.0 M Brief RW- ~1245 MDT 25 Apr 2011. Precip .01".
4/27/2011 7:00 AM 0.02 0.0 M 0.0 M RW- with a few graupel pellets mixed in 1245-1300 MDT, 26 Apr 2011. RW- again ~ 2100 MDT. 24-h precip .02".
4/28/2011 7:00 AM 0.00 0.0 M 0.0 M
4/29/2011 7:00 AM 0.00 0.0 M 0.0 M
4/30/2011 7:00 AM T 0.0 M 0.0 M A few sprinkles of rain ~ 1115 MDT and again at 1330 MDT on 29 Apr 2011. Trace precip
5/1/2011 7:00 AM 0.00 0.0 M 0.0 M
5/2/2011 7:00 AM T 0.0 M 0.0 M SW-- 1545-1550 MDT, 01 May 2011. Trace precip. No accumulation. Temperature was 43 deg F at the time.
5/3/2011 7:00 AM T 0.0 M 0.0 M A few spits of snow and rain in very light showers midday 02 May 2011. Trace precip. No accumulation.
5/4/2011 7:00 AM 0.00 0.0 M 0.0 M
5/5/2011 7:00 AM 0.00 0.0 M 0.0 M
5/6/2011 7:00 AM 0.00 0.0 M 0.0 M
5/7/2011 7:00 AM 0.00 0.0 M 0.0 M
5/8/2011 7:00 AM 0.00 0.0 M 0.0 M
5/9/2011 7:00 AM 0.00 0.0 M 0.0 M
5/10/2011 7:00 AM 0.00 0.0 M 0.0 M
5/11/2011 7:10 AM 0.72 T M T M Three distinct waves of R/RW in Bldr: 2350 MST 10 May 2011 to 0030 MST 11 May, 0150-0330 MST 11 May, and 0430 MST thru obs time (0710 MST), the last producing the most pcpn. Rain mixed with snow, briefly all snow, between 0630 and 0710 MST. At 0710 MST, S-R-, 34 deg F (min so far), pcpn .67 as rain +.05 as snow. Trace of slush on ground. Precip still falling at obs time.
5/12/2011 7:20 AM 0.80 0.0 M 0.0 M Mixture of rain and snow changed to mostly rain after 0730 MDT 11 May 2011, but small pellets of semi-opaque ice mixed in until midday. R-, sometimes just drizzle, ended 1530 MDT. Pcpn .44" from 0710-1530 MDT. R- or drizzle began again 1700 MDT, continued til past 2400 MDT. +.17 by 2230 MDT. Lull in precip probable from 0300 to 0500 MDT 12 May, but then R- began again ~0530 MDT, still in progress at obs time (0720 MDT). Precip since 2230 MDT +.19", for a 24-h total of 0.80".
5/13/2011 7:00 AM 0.12 0.0 M 0.0 M R- in progress at beginning of obs period, continued until 1000 MDT 12 May 2011. R-- 1000-1230 MDT, then R- 1230-1500 MDT. Lull in precip 1500-1600 MDT. Precip to 1600 MDT 0.11". R-- or sprinkles 1600 MDT until mid evening. (.01"). 24-h total 0.12".
5/14/2011 7:00 AM 0.00 0.0 M 0.0 M
5/15/2011 7:00 AM 0.46 0.0 M 0.0 M Light drizzle 1220-1230 MDT 14 May 2011. Then thick drizzle by 1330 MDT, becoming R- later in the afternoon and continuing until ~2100 MDT. Precip .46".
5/16/2011 7:00 AM 0.04 0.0 M 0.0 M Light rainshowers mid-morning. Precip .04"
5/17/2011 7:00 AM 0.00 0.0 M 0.0 M
5/18/2011 7:00 AM 0.05 0.0 M 0.0 M TRW- with one long rumble of thunder 1505-1520 MDT 17 May 2011. Precip .04". Another .01" fell either late night 17 May or early morning 18 May, time unknown. 24-h total .05".
5/19/2011 7:00 AM 1.67 0.0 M 0.0 M RW- 0815-1000 MDT 18 May 2011, then a lull in precip. RW/RW- 1215-1530 MDT. Thunder heard shortly after 1300 MDT. R/R- resumed 1645 MDT continued til 2300 MDT. Daily precip .81" by 1810 MDT, +.58" more by 2130 MDT. Light showers 0100-0300 MDT 19 May probably brought no more than a few hundredths precip. At 0700 MDT 19 May measured another 0.28" precip since 2130 MDT the previous evening. 24-h total 1.67".
5/20/2011 7:00 AM 0.53 0.0 M 0.0 M RW- 0945-1030 MDT 19 May 2011. Precip .04". More RW- 1415 MDT, then R- by 1500 MDT, with occasional RW thru 1800 MDT, subsiding to drizzle by 1900 MDT, and a mist by 2300 MDT. New precip to 2300 MDT +.40". A final episode of R- began at 2330 MDT, ended 0130 MDT 20 May. New precip +.09 for 24-h total of .53".
5/21/2011 7:00 AM 0.23 0.0 M 0.0 M TRW 1520-1550 MDT 20 May 2011. Precip 0.23".
5/22/2011 7:00 AM T M M M M Few drops of rain midday.
5/23/2011 7:00 AM 0.00 0.0 M 0.0 M
5/24/2011 7:00 AM 0.15 0.0 M 0.0 M Brief TRW- ~1745 MDT 23 May 2011. Precip .01". TRW- 2100-2115 MDT, then RW- until 2230 MDT. Precip +.14" for 24-h total of 0.15".
5/25/2011 7:00 AM 0.23 0.0 M 0.0 M RW- 1000-1215 MDT 24 May 2011 and again 1440-1520 MDT. Total precip 0.23".
5/26/2011 7:00 AM 0.00 0.0 M 0.0 M
5/27/2011 7:00 AM 0.00 0.0 M 0.0 M
5/28/2011 7:00 AM 0.00 0.0 M 0.0 M
5/29/2011 7:00 AM 0.01 0.0 M 0.0 M Brief sprinkle ~ 2015 MDT 28 May 2011. Than RW- between 2100 and 2130 MDT. Precip .01"
5/30/2011 7:00 AM 0.00 0.0 M 0.0 M
5/31/2011 7:00 AM T 0.0 M 0.0 M A few drops of rain, ~0800 MDT 30 May 2011 (trace). Brief sprinkles from evaporating drops in blow-over showers from the Divide in strong downslope flow, ~1810 MDT and again 2220 MDT (trace).
6/1/2011 7:00 AM 0.00 0.0 M 0.0 M
6/2/2011 7:00 AM 0.00 0.0 M 0.0 M
6/3/2011 7:00 AM 0.00 0.0 M 0.0 M
6/4/2011 7:00 AM 0.00 0.0 M 0.0 M
6/5/2011 7:00 AM 0.00 0.0 M 0.0 M
6/6/2011 7:00 AM 0.00 0.0 M 0.0 M
6/7/2011 7:00 AM 0.00 0.0 M 0.0 M
6/8/2011 7:00 AM 0.00 0.0 M 0.0 M
6/9/2011 7:20 AM 0.09 0.0 M 0.0 M Few drops of rain during the evening of 08 June 2011, trace precip. Thunder heard between 2215-2230 MDT but no rain. RW- 0200-0245 MDT 09 June, then drizzle from before sunrise thru obs time (0720 MDT). Precip .09".
6/10/2011 7:00 AM 0.03 0.0 M 0.0 M Drizzle during the morning until 1400 MDT 09 June 2011. Precip .03"
6/11/2011 7:00 AM 0.00 0.0 M 0.0 M
6/12/2011 7:00 AM T 0.0 M 0.0 M RW--, a few small drops ~1430 MDT and again ~1600 MDT, a few larger drops. Trace each time. No thunder.
6/13/2011 7:00 AM 0.00 0.0 M 0.0 M
6/14/2011 7:00 AM 0.00 0.0 M 0.0 M
6/15/2011 7:00 AM 0.00 0.0 M 0.0 M
6/16/2011 7:00 AM 0.00 0.0 M 0.0 M
6/17/2011 7:00 AM 0.00 0.0 M 0.0 M
6/18/2011 7:00 AM 0.00 0.0 M 0.0 M RW-- ~1530 MDT 17 Jun3 2011. Trace pcpn.
6/19/2011 7:00 AM 0.00 0.0 M 0.0 M
6/20/2011 7:00 AM 0.85 0.0 M 0.0 M TRW- 1820-1840 MDT 19 Jun 2011, estimated precip .08". TRW- 2115-2215 MDT, estimated precip +.15". Moderate rain began 0030 MDT 20 Jun 2011, first hour or two with thunder. Then R- until 0530 MDT. Estimated precip +.62". Storm total .85".
6/21/2011 7:00 AM 0.04 0.0 M 0.0 M Occasional RW- from 1230-1530 MDT 20 Jun 2011. Precip .04".
6/22/2011 7:00 AM 0.00 0.0 M 0.0 M
6/23/2011 7:00 AM 0.00 0.0 M 0.0 M
6/24/2011 7:00 AM 0.01 0.0 M 0.0 M Widely scattered showers in the area, midday to mid afternoon, 23 June 2011. Precip .01", time unknown
6/25/2011 7:00 AM 0.00 0.0 M 0.0 M
6/26/2011 7:00 AM 0.00 0.0 M 0.0 M
6/27/2011 7:00 AM 0.00 0.0 M 0.0 M
6/28/2011 7:00 AM 0.00 0.0 M 0.0 M
6/29/2011 7:00 AM 0.00 0.0 M 0.0 M
6/30/2011 7:00 AM 0.05 0.0 M 0.0 M TRW- ~1240 MDT 29 Jun 2011 for 5-10 min. Measurable precip. Thunder and sprinkles ~1440 MDT (trace). TRW- ~1615 MDT for less than 10 min. Measurable precip. Precip thru 1800 MDT .04". RW- ~2100 MDT. Precip +.01. 24-h total .05".
7/1/2011 7:00 AM 0.12 M M M M TRW- ~1500 MDT 30 Jun 2011, precip .03". Sprinkles, small drops ~1800 MDT, RW- ~1900 MDT, then TRW- with a few cloud-to-ground strikes ~2000 MDT. Precip +.09". 24-h total .12".
7/2/2011 7:00 AM 0.02 M M M M TRW- 2130-2145 MDT 01 Jul 2011, big drops at the start, but only .02" precip. Only one rumble of thunder.
7/3/2011 7:00 AM 0.00 0.0 M M M
7/4/2011 7:00 AM T M M M M Light sprinkles of rain late afternoon with weak downburst, 03 July 2011. Trace precip.
7/5/2011 7:00 AM 0.00 0.0 M M M
7/6/2011 7:00 AM 0.02 M M M M RW- 1730-1830 MDT 05 Jul 2011. Precip .02".
7/7/2011 7:00 AM 0.04 M M M M TRW- 1625-1700 MDT 06 Jul 2011. Precip .04".
7/8/2011 7:00 AM 1.71 M M M M TRW 1545-1615 MDT 07 July 2011 delivered an estimated 0.25" of precip. A second TRW broke over south Boulder ~1740L with quite dark skies, preceded by fractocumulus at 3500 ft AGL, moving from SE, possibly an outflow. TRW/TRW+ continued thru 1815 MDT, by which time perhaps +0.80" more had fallen. TRW- til 1845 MDT, then RW- til ~2000 MDT. At 1925L, 1.26" measured in gauge, the total for the day up to that time. Between 1925 and 2000L, +.05". TRW 2118-2145L, brought +.39". +.01" occurred later in the night, time unknown. 24-h total 1.71".
7/9/2011 7:00 AM 0.00 0.0 M M M
7/10/2011 7:00 AM 0.64 M M M M TRW+ 1715-1745 MDT 09 Jul 2011. Precip .64".
7/11/2011 7:00 AM 0.39 M M M M Brief TRW at 1415 MDT 10 July 2011, lasted 2 min. Precip .03". TRW- began 1715 MDT, then TRW at 1725 MDT, then 3 min of hail at 1730 MDT, most 1/4" or less, enough to be visible on lawn. Little damage to garden plants. Rain tapered off and ended by 1740 MDT. Precip +.18". RW began 1800 MDT, then RW- by 1810 MDT, ending 1820 MDT. Precip +.10". TRW- 1910-1940 MDT. Precip +.07". Another .01" fell later in the evening, time unknown. 24-h total .39".
7/12/2011 7:00 AM 0.15 M M M M TRW- began 1630 MDT 11 Jul 2011 became R- by 1730 MDT and ended by 1910 MDT. Precip 0.14". An additional .01" fell later, time unknown. 24-h total 0.15".
7/13/2011 7:00 AM 0.10 M M M M TRW- began at 2100 MDT 12 Jul 2011, became R- by 2130 MDT and ended ~2230 MDT. Precip .10".
7/14/2011 7:00 AM T M M M M RW-- 1800-1830 MDT 13 July 2011. Trace precip.
7/15/2011 7:00 AM 0.04 M M M M Occasional TRW-/RW- 1600-1800 MDT 14 July 2011. Precip .04"
7/16/2011 7:00 AM T M M M M TRW-- 1915 to 1945 MDT 15 Jul 2011. Just one low rumble of thunder. No wind. Trace precip.
7/17/2011 7:00 AM 0.00 0.0 M M M
7/18/2011 7:00 AM 0.00 0.0 M M M
7/19/2011 7:00 AM 0.00 0.0 M M M
7/20/2011 7:00 AM 0.04 M M M M Occasional RW- 1330-1530 MDT 19 Jul 2011. Precip .01". TRW- 1730-1810 MDT. Precip +.03". 24-h total .04".
7/21/2011 7:00 AM 0.08 M M M M TRW- 1735-1805 MDT 20 Jul 2011. Precip .08".
7/22/2011 7:00 AM 0.00 0.0 M M M
7/23/2011 7:00 AM T M M M M A few drops of rain ~1935 MDT 22 Jul 2011. Trace precip.
7/24/2011 7:00 AM 0.00 0.0 M M M
7/25/2011 7:00 AM 0.00 0.0 M M M
7/26/2011 7:00 AM 0.00 0.0 M M M
7/27/2011 7:00 AM 0.01 M M M M RW-- ~1400 MDT 26 Jul 2011 (trace). TRW-- ~1845 MDT with gusty south winds, on very edge of thunderstorm to the SE (trace). RW- ~2000 MDT (.01").
7/28/2011 7:00 AM 0.04 M M M M TRW- 1910-1950 MDT 27 Jul 2011. Precip .04".
7/29/2011 7:00 AM 0.00 0.0 M M M
7/30/2011 7:00 AM T M M M M Thunder from 1810-1845 MDT, 29 Jul 2011. RW--, smll droplets, from 1840-1850 MDT (trace).
7/31/2011 7:00 AM 0.00 0.0 M M M
8/1/2011 7:00 AM 0.08 M M M M Thunder began 1800 MDT 31 July 2011. First drops fell 1837 MDT. Measurable rain held off til 1850 MDT. Cloud-to ground lightning, a few strokes close by. TRW- til 1915 MDT. Precip .08.
8/2/2011 7:00 AM 0.00 0.0 M M M
8/3/2011 7:00 AM 0.05 M M M M Occasional RW- 1230-1445 MDT 02 Aug 2011. Precip .03". Occasional RW- 2200-2330 MDT. Precip +.02".
8/4/2011 7:00 AM 0.00 0.0 M M M
8/5/2011 7:00 AM 0.00 0.0 M M M
8/6/2011 7:00 AM 0.00 0.0 M M M
8/7/2011 7:00 AM 0.00 0.0 M M M
8/8/2011 7:00 AM 0.00 0.0 M M M
8/9/2011 7:00 AM 0.00 0.0 M M M
8/10/2011 7:00 AM 0.00 0.0 M M M
8/11/2011 7:00 AM 0.00 0.0 M M M
8/12/2011 7:00 AM T M M M M Few drops of rain ~1520 MDT 11 Aug 2011
8/13/2011 7:00 AM 0.00 0.0 M M M
8/14/2011 7:00 AM 0.00 0.0 M M M
8/15/2011 7:00 AM 0.06 M M M M TRW- 1515-1545 MDT 14 Aug 2011. Pcpn .06". Occasional RW-- 1830-1900 MDT and again ~2000 MDT. Trace pcpn.
8/16/2011 7:00 AM 0.00 0.0 M M M
8/17/2011 7:00 AM 0.45 M M M M TRW-- 1045-1055 MDT 16 Aug 2011, trace precip. TRW+A 1403-1415 MDT, very small hailstones, no damage even to lettuce. Precip .34". TRW- 1640-1655 MDT, precip +.11". 24-h total .45".
8/18/2011 7:00 AM T M M M M Few drops of rain ~1700 MDT 17 Aug 2011
8/19/2011 7:00 AM 0.00 0.0 M M M
8/20/2011 7:00 AM 0.17 M M M M TRW- 1700-1730 MDT 19 Aug 2011. Precip .08". RW- 1815-1910 MDT. Precip +.02". RW- 2105-2145 MDT. Precip +.07". 24-h total 0.17".
8/21/2011 7:00 AM T M M M M A few large drops of rain fell for one or two minutes ~2200 MDT 20 Aug 2011. Trace precip
8/22/2011 7:00 AM 0.00 0.0 M M M
8/23/2011 7:00 AM 0.02 M M M M RW-- 1100-1115 MDT 22 Aug 2011, enough to dampen the pavement. Trace precip. TRW- 1930-1940 MDT. Precip .02".
8/24/2011 7:00 AM 0.00 0.0 M M M
8/25/2011 7:00 AM 0.00 0.0 M M M
8/26/2011 7:00 AM T M M M M A few sprinkles and one low rumble of thunder 1850-2000 MDT 25 Aug 2011. Trace precip.
8/27/2011 7:00 AM T M M M M Occasional RW-- 1800-1930 MDT 26 Aug 2011. Trace precip.
8/28/2011 7:00 AM T M M M M RW-- (a few small drops) 1530 MDT 27 Aug 2011. Trace precip.
8/29/2011 7:00 AM 0.01 M M M M Brief RW-- 1715 MDT, 28 Aug 2011. Trace precip. RW- 1740-1800 MDT. Precip .01"
8/30/2011 7:00 AM 0.00 0.0 M M M
8/31/2011 7:00 AM T M M M M A few drops of rain ~1830 MDT 30 Aug 2011. Trace precip.
9/1/2011 7:00 AM 0.00 0.0 M 0.0 M
9/2/2011 7:00 AM 0.01 0.0 M 0.0 M RW- 1645-1700 MDT 01 Sep 2011. Precip .01".
9/3/2011 7:00 AM T 0.0 M 0.0 M Sprinkles ~1900 MDT 02 Sep 2011. Trace precip.
9/4/2011 7:00 AM 0.00 0.0 M 0.0 M
9/5/2011 7:00 AM 0.00 0.0 M 0.0 M
9/6/2011 7:00 AM 0.00 0.0 M 0.0 M
9/7/2011 7:00 AM 0.27 0.0 M 0.0 M Scattered RW- or TRW- 1345-1745 MDT 06 Sep 2011. Was not at home to hear thunder, if it occurred. Precip .05". More showers late night 06 Sep and light rain or drizzle 0200-0500 MDT. Precip +.22". 24-h total .27".
9/8/2011 7:00 AM 0.65 0.0 M 0.0 M Steady R-0930-1330 MDT 07 Sep 2011. Precip 0.65".
9/9/2011 7:00 AM 0.00 0.0 M 0.0 M
9/10/2011 7:00 AM 0.00 0.0 M 0.0 M
9/11/2011 7:00 AM 0.00 0.0 M 0.0 M
9/12/2011 7:00 AM 0.00 0.0 M 0.0 M
9/13/2011 7:00 AM 0.01 0.0 M 0.0 M Very light shower moved off foothills ~1700 MDT 12 Sep 2011. Trace precip. RW- ~2330 MDT. Precip 0.01"
9/14/2011 7:00 AM 0.02 0.0 M 0.0 M Thunder heard twice ~ 2130 MDT 13 Sep 2011. A few drops of rain ~2200 MDT, then one or two RW- until 2300 MDT. Precip 0.02.
9/15/2011 7:00 AM 1.63 0.0 M 0.0 M Measurable rain began 1730 MDT 14 Sep 2011, continued steadily until 0230 MDT 15 Sep 2011. 0.58" precip by 2230 MDT. R- until about 2245 MDT 14 Sep, then R until 0030 MDT 15 Sep. Storm total 1.63"
9/16/2011 7:00 AM 0.01 0.0 M 0.0 M RW- 1750-1830 MDT 15 Sep 2011. Precip 0.01".
9/17/2011 7:00 AM 0.00 0.0 M 0.0 M
9/18/2011 7:00 AM 0.00 0.0 M 0.0 M
9/19/2011 7:00 AM 0.00 0.0 M 0.0 M
9/20/2011 7:00 AM 0.00 0.0 M 0.0 M
9/21/2011 7:00 AM 0.00 0.0 M 0.0 M
9/22/2011 7:00 AM 0.05 0.0 M 0.0 M RW--/RW- began 1750 MDT 21 Sep 2011. Mostly RW- after 1830 MDT. Thunder heard 1850, 1925, and 2000 MDT. Showers ended 2030 MDT. Precip .05". First frost of the season on rooftops and scattered frost on grass at dawn, 22 Sep 2011.
9/23/2011 7:00 AM 0.00 0.0 M 0.0 M
9/24/2011 7:00 AM 0.00 0.0 M 0.0 M
9/25/2011 7:00 AM 0.00 0.0 M 0.0 M
9/26/2011 7:00 AM 0.00 0.0 M 0.0 M
9/27/2011 7:00 AM 0.00 0.0 M 0.0 M
9/28/2011 7:00 AM 0.00 0.0 M 0.0 M
9/29/2011 7:00 AM 0.00 0.0 M 0.0 M
9/30/2011 7:00 AM 0.00 0.0 M 0.0 M



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