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 17 1.39 2.39 31 2.39 31 0.00 0 0 8 1 8.3 4 4
Nov 17 1.04 0.52 30 0.52 30 0.00 0 0 5 3 4.3 2 3
Dec 17 0.79 0.50 31 0.50 31 0.00 0 0 6 3 10.3 6 9
Jan 18 0.64 0.68 31 0.68 31 0.00 0 0 5 1 8.1 3 11
Feb 18 0.63 0.96 28 0.96 28 0.00 0 0 9 5 17.7 8 15
March 18 1.86 2.26 31 2.26 31 0.00 0 0 6 0 4.9 3 3
April 18 2.34 1.32 29 1.32 29 0.00 0 0 9 3 4.0 4 2
May 18 2.66 5.31 31 5.31 31 0.00 0 0 13 2 0.0 0 0
June 18 2.16 1.29 30 1.29 30 0.00 0 0 6 3 0.0 0 0
July 18 1.67 1.53 30 1.53 30 0.00 0 0 14 2 0.0 0 0
Aug 18 1.76 0.32 31 0.32 31 0.00 0 0 6 1 0.0 0 0
Sept 18 1.61 0.91 30 0.91 30 0.00 0 0 4 3 0.0 0 0
Water Year Totals: 18.55" 17.99" 363 days 17.99" 363 0.00" 0 days 0 91 days 27 days 57.6" 30 days 47 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
10/1/2017 0.09
10/2/2017 0.66
10/3/2017 0.54
10/4/2017 0.00
10/5/2017 0.00
10/6/2017 T
10/7/2017 0.00
10/8/2017 0.00
10/9/2017 0.63
10/10/2017 0.27
10/11/2017 0.00
10/12/2017 0.00
10/13/2017 0.00
10/14/2017 0.00
10/15/2017 0.00
10/16/2017 0.00
10/17/2017 0.00
10/18/2017 0.00
10/19/2017 0.00
10/20/2017 0.00
10/21/2017 0.00
10/22/2017 0.00
10/23/2017 0.00
10/24/2017 0.00
10/25/2017 0.00
10/26/2017 0.00
10/27/2017 0.10
10/28/2017 0.00
10/29/2017 0.00
10/30/2017 0.05
10/31/2017 0.05
11/1/2017 0.00
11/2/2017 0.00
11/3/2017 0.00
11/4/2017 0.00
11/5/2017 0.02
11/6/2017 T
11/7/2017 0.32
11/8/2017 0.10
11/9/2017 0.00
11/10/2017 0.00
11/11/2017 0.00
11/12/2017 0.00
11/13/2017 0.00
11/14/2017 0.00
11/15/2017 0.00
11/16/2017 0.00
11/17/2017 0.00
11/18/2017 0.06
11/19/2017 0.00
11/20/2017 0.00
11/21/2017 0.00
11/22/2017 0.02
11/23/2017 0.00
11/24/2017 0.00
11/25/2017 T
11/26/2017 0.00
11/27/2017 0.00
11/28/2017 T
11/29/2017 0.00
11/30/2017 0.00
12/1/2017 0.00
12/2/2017 0.00
12/3/2017 0.00
12/4/2017 0.00
12/5/2017 0.00
12/6/2017 0.00
12/7/2017 0.00
12/8/2017 0.00
12/9/2017 0.00
12/10/2017 0.00
12/11/2017 0.00
12/12/2017 0.00
12/13/2017 0.00
12/14/2017 0.14
12/15/2017 0.00
12/16/2017 0.00
12/17/2017 T
12/18/2017 0.00
12/19/2017 0.00
12/20/2017 0.00
12/21/2017 0.12
12/22/2017 0.02
12/23/2017 0.00
12/24/2017 0.20
12/25/2017 0.00
12/26/2017 0.01
12/27/2017 0.01
12/28/2017 0.00
12/29/2017 0.00
12/30/2017 T
12/31/2017 T
Day of YearDaily PrcpMultiday Prcp
1/1/2018 T
1/2/2018 0.00
1/3/2018 0.00
1/4/2018 0.00
1/5/2018 0.00
1/6/2018 0.00
1/7/2018 0.00
1/8/2018 0.00
1/9/2018 0.00
1/10/2018 0.00
1/11/2018 0.01
1/12/2018 0.00
1/13/2018 0.00
1/14/2018 0.00
1/15/2018 0.01
1/16/2018 0.03
1/17/2018 0.00
1/18/2018 0.00
1/19/2018 0.00
1/20/2018 0.00
1/21/2018 0.38
1/22/2018 0.25
1/23/2018 0.00
1/24/2018 0.00
1/25/2018 0.00
1/26/2018 0.00
1/27/2018 0.00
1/28/2018 0.00
1/29/2018 0.00
1/30/2018 0.00
1/31/2018 0.00
2/1/2018 0.02
2/2/2018 0.01
2/3/2018 0.00
2/4/2018 T
2/5/2018 T
2/6/2018 0.01
2/7/2018 0.00
2/8/2018 0.00
2/9/2018 0.00
2/10/2018 0.10
2/11/2018 0.14
2/12/2018 T
2/13/2018 T
2/14/2018 0.00
2/15/2018 0.00
2/16/2018 0.02
2/17/2018 0.00
2/18/2018 0.00
2/19/2018 0.02
2/20/2018 0.52
2/21/2018 0.00
2/22/2018 0.00
2/23/2018 T
2/24/2018 0.12
2/25/2018 0.00
2/26/2018 0.00
2/27/2018 0.00
2/28/2018 0.00
3/1/2018 0.00
3/2/2018 0.00
3/3/2018 0.00
3/4/2018 0.00
3/5/2018 0.00
3/6/2018 0.00
3/7/2018 0.00
3/8/2018 0.00
3/9/2018 0.00
3/10/2018 0.00
3/11/2018 0.00
3/12/2018 0.00
3/13/2018 0.00
3/14/2018 0.00
3/15/2018 0.00
3/16/2018 0.21
3/17/2018 0.00
3/18/2018 0.00
3/19/2018 0.68
3/20/2018 0.00
3/21/2018 0.00
3/22/2018 0.00
3/23/2018 0.00
3/24/2018 0.00
3/25/2018 0.00
3/26/2018 0.09
3/27/2018 0.70
3/28/2018 0.00
3/29/2018 0.48
3/30/2018 0.10
3/31/2018 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2018 0.01
4/2/2018 0.01
4/3/2018 T
4/4/2018 0.00
4/5/2018 0.00
4/6/2018 0.00
4/7/2018 0.31
4/8/2018 0.00
4/9/2018 T
4/10/2018 0.11
4/11/2018 0.00
4/12/2018 0.00
4/13/2018 0.01
4/14/2018 0.00
4/15/2018 0.00
4/16/2018 0.00
4/17/2018 0.00
4/18/2018 T
4/19/2018 0.00
4/20/2018 0.00
4/21/2018 0.35
4/22/2018 0.10
4/23/2018 0.00
4/24/2018 0.19
4/25/2018 0.23
4/26/2018 0.00
4/27/2018 0.00
4/28/2018 0.00
4/29/2018
4/30/2018 0.00
5/1/2018 0.01
5/2/2018 T
5/3/2018 1.08
5/4/2018 0.58
5/5/2018 0.00
5/6/2018 0.00
5/7/2018 0.00
5/8/2018 0.00
5/9/2018 0.00
5/10/2018 0.00
5/11/2018 0.00
5/12/2018 0.15
5/13/2018 0.46
5/14/2018 0.76
5/15/2018 0.03
5/16/2018 0.00
5/17/2018 0.00
5/18/2018 0.00
5/19/2018 1.45
5/20/2018 0.38
5/21/2018 0.18
5/22/2018 0.00
5/23/2018 0.03
5/24/2018 0.00
5/25/2018 0.00
5/26/2018 0.00
5/27/2018 0.00
5/28/2018 0.00
5/29/2018 0.04
5/30/2018 T
5/31/2018 0.16
6/1/2018 0.00
6/2/2018 0.00
6/3/2018 0.00
6/4/2018 0.00
6/5/2018 0.00
6/6/2018 0.00
6/7/2018 0.00
6/8/2018 0.00
6/9/2018 0.00
6/10/2018 0.00
6/11/2018 0.00
6/12/2018 0.00
6/13/2018 0.00
6/14/2018 0.00
6/15/2018 0.00
6/16/2018 0.02
6/17/2018 0.17
6/18/2018 0.67
6/19/2018 0.39
6/20/2018 0.01
6/21/2018 0.00
6/22/2018 T
6/23/2018 T
6/24/2018 0.00
6/25/2018 0.03
6/26/2018 0.00
6/27/2018 0.00
6/28/2018 T
6/29/2018 0.00
6/30/2018 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2018 0.07
7/2/2018 0.00
7/3/2018 0.00
7/4/2018 0.02
7/5/2018 0.01
7/6/2018 0.19
7/7/2018 0.00
7/8/2018 0.00
7/9/2018 0.00
7/10/2018
7/11/2018 0.00
7/12/2018 0.00
7/13/2018 0.02
7/14/2018 0.00
7/15/2018 0.00
7/16/2018 0.28
7/17/2018 0.00
7/18/2018 T
7/19/2018 0.00
7/20/2018 0.00
7/21/2018 0.00
7/22/2018 0.01
7/23/2018 0.09
7/24/2018 0.38
7/25/2018 T
7/26/2018 0.14
7/27/2018 0.21
7/28/2018 0.06
7/29/2018 0.04
7/30/2018 0.01
7/31/2018 0.00
8/1/2018 0.00
8/2/2018 0.00
8/3/2018 0.00
8/4/2018 0.01
8/5/2018 0.00
8/6/2018 0.02
8/7/2018 0.00
8/8/2018 0.00
8/9/2018 0.00
8/10/2018 0.00
8/11/2018 0.00
8/12/2018 0.00
8/13/2018 0.00
8/14/2018 0.00
8/15/2018 0.04
8/16/2018 0.00
8/17/2018 0.00
8/18/2018 0.00
8/19/2018 0.22
8/20/2018 0.01
8/21/2018 T
8/22/2018 0.02
8/23/2018 0.00
8/24/2018 0.00
8/25/2018 0.00
8/26/2018 0.00
8/27/2018 0.00
8/28/2018 0.00
8/29/2018 0.00
8/30/2018 0.00
8/31/2018 0.00
9/1/2018 0.00
9/2/2018 T
9/3/2018 0.00
9/4/2018 0.00
9/5/2018 0.80
9/6/2018 0.06
9/7/2018 0.03
9/8/2018 0.00
9/9/2018 0.00
9/10/2018 0.00
9/11/2018 0.00
9/12/2018 T
9/13/2018 0.00
9/14/2018 0.00
9/15/2018 0.00
9/16/2018 0.00
9/17/2018 0.00
9/18/2018 0.00
9/19/2018 0.00
9/20/2018 0.02
9/21/2018 0.00
9/22/2018 0.00
9/23/2018 0.00
9/24/2018 0.00
9/25/2018 T
9/26/2018 0.00
9/27/2018 0.00
9/28/2018 0.00
9/29/2018 0.00
9/30/2018 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2017 7:00 AM 0.09 0.0 M 0.0 M RW- 1630-1645 MDT 30 Sep 2017. Precip .04". RW- 0445-0515 MDT 01 Oct with gusty winds SW15G25. Precip +.05".
10/2/2017 7:15 AM 0.66 0.0 M 0.0 M TRW- 1540-1545 MDT 01 Oct 2017. Precip .01" with 7-8 rumbles of thunder. RW- ~ 2030 MDT. Precip +.01". R- began around 0000 MDT 02 Oct. R or RW 0130 to 0430 MDT, then R- thru obs time (0715 MDT 02 Oct). Precip since 0000 MDT +0.64".
10/3/2017 7:00 AM 0.54 0.0 M 0.0 M R- in progress at beginning of obs period (0715 MDT 02 Oct 2017), ended at 1045 MDT. Morning precip .12". R- resumed at 1300 MDT, ended at 1800 MDT. Precip +.42"
10/4/2017 7:00 AM 0.00 0.0 M 0.0 M
10/5/2017 7:00 AM 0.00 0.0 M 0.0 M
10/6/2017 7:00 AM T 0.0 M 0.0 M A few light rain sprinkles, probably between 2100 and 2200 MDT 05 2017. Trace precip.
10/7/2017 7:00 AM 0.00 0.0 M 0.0 M
10/8/2017 7:00 AM 0.00 0.0 M 0.0 M
10/9/2017 7:20 AM 0.63 4.0 M 4.0 M Cold front passage 2015 MDT 08 Oct 2017. R- began at 2030 MDT. Precip .05" by 2150 MDT. Rain changed to snow about midnight. At 0230 MDT 09 Oct, 33°, S-, tiny flakes, accumulation 0.6" of slushy snow, precip +.28". S- continued thru the rest of the night. At 0720 MDT 09 Oct, S-¾, 32° (min so far), 4.0" of snow on the grass, precip +.30E. After several hours of wet snow and temperature at 33°, snow is now sticking to vegetation and beginning to weigh it down. 24-h precip .63".
10/10/2017 7:00 AM 0.27 2.6 M 4.0 M S-3/4 in progress and 32° at the start of the observing period: 0720 MDT 09 Oct 2017. with 4.0" of snow on the grass at 0720 MDT. S3/8 to S1/2 0830-0945 MDT, then S-. At 1115 MDT, S-1, 32.5°, snow is sloughing off trees. Accumulation at 1115 MDT was 6.6" the max measured. Precip .20" since 0720 MDT. S- ended 1300 MDT. Precip +.07". Snow never stuck to pavement but did break a few small branches around town. 4.0" of crusty snow remains at obs time. First hard freeze of the season this morning. Min 24 deg F.
10/11/2017 7:00 AM 0.00 0.0 M T M Most snow melted during the day 10 Oct 2017, as the temperature reached 55 deg F under clear skies. Snow remains at obs time in shaded areas with ~20% coverage in clearings.
10/12/2017 7:00 AM 0.00 0.0 M 0.0 M
10/13/2017 7:00 AM 0.00 0.0 M 0.0 M
10/14/2017 7:00 AM 0.00 0.0 M 0.0 M
10/15/2017 7:00 AM 0.00 0.0 M 0.0 M
10/16/2017 7:00 AM 0.00 0.0 M 0.0 M
10/17/2017 7:00 AM 0.00 0.0 M 0.0 M
10/18/2017 7:00 AM 0.00 0.0 M 0.0 M
10/19/2017 7:00 AM 0.00 0.0 M 0.0 M
10/20/2017 7:00 AM 0.00 0.0 M 0.0 M
10/21/2017 7:00 AM 0.00 0.0 M 0.0 M
10/22/2017 7:00 AM 0.00 0.0 M 0.0 M
10/23/2017 7:00 AM 0.00 0.0 M 0.0 M
10/24/2017 7:00 AM 0.00 0.0 M 0.0 M
10/25/2017 7:00 AM 0.00 0.0 M 0.0 M
10/26/2017 7:00 AM 0.00 0.0 M 0.0 M
10/27/2017 7:00 AM 0.10 1.5 M 1.0 M R--S-- began ~1315 MDT. 40° by 1330 MDT. S- began at 1450 MDT. Trace of slushy snow on grass by 1530 MDT with temperature down to 33°, 47° colder than yesterday at this time. At 1730 MDT, 32° S- continues, snow now sticking to vegetation and rooftops, about 0.5" accumulation on deck rails. At 1930L S--, 31° (min so far), 1.0” on deck rail, 2.0” on uncut grass. I reported 1.5”, precip .10". Only a trace of snow fell after 1930 MDT. 1.0" snow remains at obs time. Min 21 deg F, coldest morning so far.
10/28/2017 7:00 AM 0.00 0.0 M 0.0 M All snow melted by late afternoon 27 Oct 2017.
10/29/2017 7:00 AM 0.00 0.0 M 0.0 M
10/30/2017 7:00 AM 0.05 0.0 M 0.0 M Drizzle began 0200 MDT 30 Oct 2017, changed to freezing drizzle ~0300 MDT, which continues at obs time, 0700 MDT. Precip so far 0.05".
10/31/2017 7:00 AM 0.05 0.2 M 0.2 M Mixture of light snow and freezing drizzle in progress at start of observing period. This continued, mostly S- and sometimes very light, until 1300 MDT 30 Oct 2017. Precip since 0700 MDT .03". SW- sometime between 0000 and 0300 MDT 31 Oct. Precip +.02", accumulation 0.2".
11/1/2017 7:00 AM 0.00 0.0 M 0.0 M
11/2/2017 7:00 AM 0.00 0.0 M 0.0 M
11/3/2017 7:00 AM 0.00 0.0 M 0.0 M
11/4/2017 7:00 AM 0.00 0.0 M 0.0 M
11/5/2017 7:00 AM 0.02 0.0 M 0.0 M Daylight savings time ended at 0200 local time today, 05 Nov 2017. RW- 0445-0500 MST. Precip .02".
11/6/2017 7:00 AM T 0.0 M 0.0 M Occasional drizzle 0700-0800 MST 05 Nov 2017, just enough to dampen the pavement. Trace precip.
11/7/2017 7:00 AM 0.32 3.5 M 3.5 M R- began ~2145 MST 06 Nov 2017, changed to S- probably ~2300 MST after a few hundredths precip. S- continued most of the night, ending before 0600 MST.
11/8/2017 7:00 AM 0.10 0.8 M 4.0 M SW-- 0740-0750 MST, 0855-0910 MST, and just before noon 07 Nov 2017 (trace each time but enough to dampen pavement). ZL- began ~1415 MST, changed to SG- by 1600 MST, then to S- after dark and continued til ~2000 MST. ZL- began ~1415 MST, changed to SG- by 1600 MST, then to S- after dark and continued til ~2000 MST. At 2210 MST, moon visible, 4.3" accumulation (max measured), precip .10" since start of observing period.
11/9/2017 7:00 AM 0.00 0.0 M 1.0 M Starting the day with about 1.0" of snow in open areas with just over 50% coverage.
11/10/2017 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
11/11/2017 7:00 AM 0.00 0.0 M T M Patchy snow remains in well shaded areas.
11/12/2017 7:00 AM 0.00 0.0 M 0.0 M All snow gone.
11/13/2017 7:00 AM 0.00 0.0 M 0.0 M
11/14/2017 7:00 AM 0.00 0.0 M 0.0 M
11/15/2017 7:00 AM 0.00 0.0 M 0.0 M
11/16/2017 7:00 AM 0.00 0.0 M 0.0 M
11/17/2017 7:00 AM 0.00 0.0 M 0.0 M
11/18/2017 7:00 AM 0.06 0.0 M 0.0 M RW- began 1550 MDT 17 Nov 2017 with stiff outflow winds, W25G40. Temperature fell from upper 50s to mid 40s in about an hour. RW- thru 1630 MDT, then RW-- til 1900 MDT. Precip .06". Only a trace of rain after 1900 MDT.
11/19/2017 7:00 AM 0.00 0.0 M 0.0 M
11/20/2017 7:00 AM 0.00 0.0 M 0.0 M
11/21/2017 7:00 AM 0.00 0.0 M 0.0 M
11/22/2017 7:00 AM 0.02 0.0 M 0.0 M R-- began at 0900 MDT 21 Nov 2017, enough to dampen the pavement. Trace precip. RW- 0915-1030 MDT. Precip .02".
11/23/2017 7:00 AM 0.00 0.0 M 0.0 M
11/24/2017 7:00 AM 0.00 0.0 M 0.0 M
11/25/2017 7:00 AM T 0.0 M 0.0 M Gusty outflow winds W18G30 from high-based showers (RW--) between 1415-1445 MDT 24 Nov 2017. Trace precip.
11/26/2017 7:00 AM 0.00 0.0 M 0.0 M
11/27/2017 7:00 AM 0.00 0.0 M 0.0 M
11/28/2017 7:00 AM T 0.0 M 0.0 M RW-- around 0400 MST 28 Nov 2017. Trace precip.
11/29/2017 7:00 AM 0.00 0.0 M 0.0 M
11/30/2017 7:00 AM 0.00 0.0 M 0.0 M
12/1/2017 7:00 AM 0.00 0.0 M 0.0 M
12/2/2017 7:00 AM 0.00 0.0 M 0.0 M
12/3/2017 7:00 AM 0.00 0.0 M 0.0 M
12/4/2017 7:00 AM 0.00 0.0 M 0.0 M
12/5/2017 7:00 AM 0.00 0.0 M 0.0 M
12/6/2017 7:00 AM 0.00 0.0 M 0.0 M
12/7/2017 7:00 AM 0.00 0.0 M 0.0 M
12/8/2017 7:00 AM 0.00 0.0 M 0.0 M
12/9/2017 7:00 AM 0.00 0.0 M 0.0 M
12/10/2017 7:00 AM 0.00 0.0 M 0.0 M
12/11/2017 7:00 AM 0.00 0.0 M 0.0 M
12/12/2017 7:00 AM 0.00 0.0 M 0.0 M
12/13/2017 7:00 AM 0.00 0.0 M 0.0 M
12/14/2017 7:00 AM 0.14 2.7 M 2.7 M S- began 2330 MST 13 Dec 2017, ended ~0400 MST 14 Dec. Accumulation on grass 2.7" with a water content of 0.14".
12/15/2017 7:00 AM 0.00 0.0 M 0.5 M At obs time, about 0.5" of snow remains on open ground with 60% coverage.
12/16/2017 7:00 AM 0.00 0.0 M T M Snow remains in well-shaded areas.
12/17/2017 7:00 AM T 0.0 M T M A few tiny snow grains, not larger than a grain of sand, fell before 0700 MDT 17 Dec 2017, time unknown. Trace precip. Patchy old snow remains in well shaded areas.
12/18/2017 7:00 AM 0.00 0.0 M 0.0 M
12/19/2017 7:00 AM 0.00 0.0 M 0.0 M
12/20/2017 7:00 AM 0.00 0.0 M 0.0 M
12/21/2017 8:20 AM 0.12 1.4 M 1.4 M Snow began ~0400 MDT 21 Dec 2017. At 0820 MDT S-3/4, 19° (morning min), accumulation 1.4", preciop .12". Snow still falling at obs time, 0820 MDT.
12/22/2017 7:00 AM 0.02 1.0 M 2.0 M S- at start of observing period at 0820 MDT 21 Dec 2017. Fluffy dendrites by 0845 MDT. Snow stopped accumulating by 0930 MDT but S-- did not end until 1400 MDT. 1.0" new accumulation with a water content of .02", max on ground 2.4" about 1000 MDT. 2.0" remains on ground at obs time.
12/23/2017 7:00 AM 0.00 0.0 M 1.0 M At obs time, 1.0" of snow remains on ground with 60% coverage.
12/24/2017 7:00 AM 0.20 4.2 M 4.0 M S- began 1700 MDT 23 Dec 2017, became S+1/4 by 1800 MDT, then began tapering off slowly. Snow ended 2300 MDT. New accumulation 4.2 with a water content of .20". 4.0" on the ground at obs time. Min temperature -2 deg F.
12/25/2017 7:00 AM 0.00 0.0 M 3.0 M
12/26/2017 8:30 AM 0.01 0.8 M 4.0 M S- began approximately 0600 MST 26 Dec 2017, continued thru obs time at 0830 MST, by which time 0.8" of very fluffy new snow with a water content on only .01". Total on the ground 4.0"
12/27/2017 7:00 AM 0.01 0.2 M 3.0 M S- in progress at start of observing period: 0830 MDT 26 Dec 2017. S--, with short invervals of no snow, from 0900 to 1300 MST. Precip .01. New accumulation 0.2". 3.0" snow remains on the ground at obs time 0700 MST 27 Dec 2017.
12/28/2017 7:00 AM 0.00 0.0 M T M About 30% of open ground still covered by about an inch of snow.
12/29/2017 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
12/30/2017 7:00 AM T T M T M A few snow grains after 0600 MDT 30 Dec 2017, then a few stellar crystals (trace precip). Temperature dropped 51 deg F between 1530 MDT 29 Dec, when it was 63 deg F (all previous snow melted) and 0300 MDT 30 Dec, when the minimum of 12 deg F occurred.
12/31/2017 7:00 AM T T M T M A few flakes in the air until 0900 MST 30 Jan 2017. Trace precip. Very light snow began 0630 MST 31 Jan and was in progress at obs time. Trace precip.
1/1/2018 7:00 AM T T M T M S-- in progress at start of observing period. Intermittent S-- throughout the day 31 Dec 2017, continuing until very late. Trace precip.
1/2/2018 7:00 AM 0.00 0.0 M 0.0 M
1/3/2018 7:00 AM 0.00 0.0 M 0.0 M
1/4/2018 7:00 AM 0.00 0.0 M 0.0 M
1/5/2018 7:00 AM 0.00 0.0 M 0.0 M
1/6/2018 7:00 AM 0.00 0.0 M 0.0 M
1/7/2018 7:00 AM 0.00 0.0 M 0.0 M
1/8/2018 7:00 AM 0.00 0.0 M 0.0 M
1/9/2018 7:00 AM 0.00 0.0 M 0.0 M
1/10/2018 7:00 AM 0.00 0.0 M 0.0 M
1/11/2018 7:00 AM 0.01 0.0 M 0.0 M RW- 1530-1545 MST 10 Jan 2017. Precip 0.01".
1/12/2018 7:00 AM 0.00 0.0 M 0.0 M
1/13/2018 7:00 AM 0.00 0.0 M 0.0 M
1/14/2018 7:00 AM 0.00 0.0 M 0.0 M
1/15/2018 7:00 AM 0.01 0.0 M 0.0 M Freezing drizzle began ~0630 MST 15 Jan 2017, in progress at obs time. Precip .01".
1/16/2018 7:00 AM 0.03 1.1 M 0.5 M S- in progress at beginning of obs period. S- fell through 1230 MST 15 Jan 2017, then S-- until 1500 MST, when snow ended. Precip since 0700 MST .03". Max snow accumulation 1.1", almost all falling as unrimed dendrite crystals. 0.5" remains on ground at obs time.
1/17/2018 7:00 AM 0.00 0.0 M T M A trace of snow remains in open areas. 0.5" snow remains in shady areas.
1/18/2018 7:00 AM 0.00 0.0 M T M Less than 0.5" snow remains in shaded areas. Ground bare elsewhere.
1/19/2018 7:00 AM 0.00 0.0 M 0.0 M
1/20/2018 7:00 AM 0.00 0.0 M 0.0 M
1/21/2018 7:00 AM 0.38 4.6 M 4.6 M Freezing drizzle began ~2130 MST 20 Jan 2018. By 2215 MST, there was enough precip to wet pavement and put thin veneer of ice on deck rails, with T at 31°. Not more than .01 pcpn fell as ZL-. Changeover to snow occurred shortly after 0000 MST 21 Jan. Estimated accumulation 0.5" by 0200 MST. S1/2 between 0200 and 0415 MST, as band of reflectivity 20-25 dBZ passed over Boulder. At 0415 MST, est 3.0" accumulation. At obs time, S-, 27 deg F (minimum so far), 4.6" accumulation, precip 0.38".
1/22/2018 7:00 AM 0.25 2.4 M 6.0 M S- in progress at start of observing period. This continued steadily thru 1400 MST 21 Jan 2018, then S-- until 1445 MST, when snow ended. Precip since 0700 MST 21 Jan 0.25". New snow accumulation 2.4". Max on ground 7.0" at 1400 MST. Accumulation at obs time 6.0".
1/23/2018 7:00 AM 0.00 0.0 M 5.0 M
1/24/2018 7:00 AM 0.00 0.0 M 4.5 M
1/25/2018 7:00 AM 0.00 0.0 M 4.0 M
1/26/2018 7:00 AM 0.00 0.0 M 4.0 M
1/27/2018 7:00 AM 0.00 0.0 M 3.5 M
1/28/2018 7:00 AM 0.00 0.0 M 3.5 M
1/29/2018 7:00 AM 0.00 0.0 M 2.5 M
1/30/2018 7:00 AM 0.00 0.0 M 1.0 M One inch of snow remains, but only 50% coverage in open areas.
1/31/2018 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
2/1/2018 7:00 AM 0.02 0.2 M 0.2 M Snow grains began falling very lightly ~2130 MST 31 Jan 2018. This continued thru the rest of the night. By 0700 MST 01 Feb, 0.2" of accumulation with a water content of .02".
2/2/2018 7:00 AM 0.01 0.1 M T M S-, visibility 2 miles in progress at start of observing period. This ended at noon. Precip .01". Accumulation 0.1". Max on the ground 0.3" at 1000 MST 01 Feb 2018. Most of the morning snow melted by afternoon, leaving only remnants of 21 January snowfall in the shade. Only patches of snow remain in shaded areas.
2/3/2018 7:00 AM 0.00 0.0 M T M A few patches of snow remain in well-shaded areas.
2/4/2018 7:00 AM T T M T M Frontal passage ~ 0315 MST 04 Feb 2018. Freezing drizzle began 0400 MST, changed to rimed snow grains before 0700 MST, which is obs time. Only a trace of precip so far and a dusting of snow on the ground
2/5/2018 7:00 AM T T M 0.0 M S-- in progress at start of observing period, ended by 1030 MST 04 Feb 2018. Trace accumulation, trace precip. Chinook beginning ~0300 MST 05 Feb pushed temperature from low 20s to 49 deg F, melting all remaining snow.
2/6/2018 7:00 AM 0.01 0.0 M 0.0 M RW- 0720-0725 MST 05 Feb, small drops, provided rare morning rainbow in February. Precip .01". RW-- ~1140 MST (trace precip) and brief SW-- ~1900 MST (trace precip).
2/7/2018 7:00 AM 0.00 0.0 M 0.0 M
2/8/2018 7:00 AM 0.00 0.0 M 0.0 M
2/9/2018 7:00 AM 0.00 0.0 M 0.0 M
2/10/2018 7:00 AM 0.10 1.7 M 1.7 M Freezing drizzle began 0900 MST 09 Feb 2018, ended by 1030 MST (trace precip). S- began 1900 MST. Ending time uncertain but probably before 2400 MST. Accumulation 1.7", precip .10". Occasional S-- after midnight thru obs time at 0700 MST 10 Feb (trace)
2/11/2018 7:00 AM 0.14 2.6 M 4.3 M S- 0800-1200 MST 10 Feb 2018 (ending time approximate). S- again 1800-2100 MST. New accumulation 2.6" with a water content of .14". Max on ground 4.3" measured at 0700 MST 11 Feb.
2/12/2018 7:00 AM T T M 1.0 M Very light snow began at 0650 MST 12 Feb 2018, just before obs time (trace precip). 1.0" of old snow remains on the ground with 90% coverage.
2/13/2018 7:00 AM T T M 1.0 M Very light snow at start of observation period continued until 1430 MST 12 Feb 2018. Trace accumulation, trace precip. One inch of snow with 90% coverage remains at 0700 MST 13 Feb.
2/14/2018 7:00 AM 0.00 0.0 M T M Snow melted yesterday except in well-shaded areas.
2/15/2018 7:00 AM 0.00 0.0 M 0.0 M All traces of snow, even in well-shaded areas, disappeared by afternoon on 14 Feb 2018.
2/16/2018 7:00 AM 0.02 0.6 M 0.6 M S- began 2000 MST 15 Feb 2018, ended before 2300 MST. Precip .02". Accumulation 0.6"
2/17/2018 7:00 AM 0.00 0.0 M 0.0 M All snow melted by late afternoon 16 Feb 2018.
2/18/2018 7:00 AM 0.00 0.0 M 0.0 M
2/19/2018 7:30 AM 0.02 0.8 M 0.8 M Strong cold front arrived ~1940 MST 18 Feb 2018. Freezing drizzle probably began before 2400 MST, changed to snow a few hours later. At obs time, S-2, 11 deg F, after falling 54 deg F from yesterday afternoon maximum, accumulation 0.8" of fluff, precip 0.02"
2/20/2018 7:00 AM 0.52 9.1 M 7.5 M Mostly S--, occasionally S- during the morning of 19 Feb 2018. S-1 began ~1130 MST. NE-SW band of snow with radar reflectivity factor 20 dBZ moved NNE from Denver, reaching Boulder ~1430 MST, causing S½ and covering streets and sidewalks that had just been wet. S- again by 1505 MST. Other bands, some very narrow, passed thru later in the afternoon, each oriented with the winds aloft (from the SW) but moving NNE. Daytime max 16°, 49° colder than yesterday. The biggest band of the day came over south Boulder ~1810 MST with S½ to S+¼. Snow fell at the rate of ~2”/h. At 1900 MST, 10°, a new min for the day, S+¼, precip since 0700 MST +.25, total accumulation on the lawn 6.0". This solid band moved little while over Boulder and had 20 dBZ echoes, moving NE along the band. S+ ended about 2045 MST as W edge of snow band passed to the east. S- after that. At 2140 MST, 8°, S-1, 9.1" on the grass (max measured). Precip since 1900 MST +.23". S- continued until late, then intermittent S-- thru early 20 Feb but only a trace precip after 0000 MST Tue. Perhaps 0.4 accumulation after 2140 MST but snow settled faster than it accumulated. Additional precip +.04. 7.5" accumulation at obs time, 0700 MST 20 Feb.
2/21/2018 7:00 AM 0.00 0.0 M 5.0 M
2/22/2018 7:00 AM 0.00 0.0 M 4.5 M
2/23/2018 7:00 AM T 0.0 M 4.0 M A few flakes in the air ~1700 MST 22 Feb 2018. No accumulation. Trace precip.
2/24/2018 7:00 AM 0.12 2.6 M 5.5 M First flakes in the air by 1615 MST 23 Feb 2018. S- til ~1845 MST, then SW½ 1845-2100 MST, ending soon after. 2.6" of new snow with total on the ground 6.0". Precip 0.12" 5.5" on the ground at obs time, 0700 MST 24 Feb.
2/25/2018 7:00 AM 0.00 0.0 M 2.5 M
2/26/2018 7:00 AM 0.00 0.0 M 2.0 M 2.0" crusty snow remains.
2/27/2018 7:00 AM 0.00 0.0 M 1.5 M 1.5" of snow remains in open areas with 90% coverage.
2/28/2018 7:00 AM 0.00 0.0 M T M One to two inches of snow remains but only in shaded areas. Open areas are 90% bare.
3/1/2018 7:00 AM 0.00 0.0 M T M Ground still white with snow in shaded areas.
3/2/2018 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
3/3/2018 7:00 AM 0.00 0.0 M T M Patchy snow remains in well shaded areas.
3/4/2018 7:00 AM 0.00 0.0 M T M Patchy snow remains in well shaded areas.
3/5/2018 7:00 AM 0.00 0.0 M 0.0 M Bora windstorm late afternoon and evening 04 Mar 2018. Gusts from the west to 50 mph.
3/6/2018 7:00 AM 0.00 0.0 M 0.0 M
3/7/2018 7:00 AM 0.00 0.0 M 0.0 M
3/8/2018 7:00 AM 0.00 0.0 M 0.0 M
3/9/2018 7:00 AM 0.00 0.0 M 0.0 M
3/10/2018 7:00 AM 0.00 0.0 M 0.0 M
3/11/2018 7:00 AM 0.00 0.0 M 0.0 M
3/12/2018 7:00 AM 0.00 0.0 M 0.0 M
3/13/2018 7:00 AM 0.00 0.0 M 0.0 M
3/14/2018 7:00 AM 0.00 0.0 M 0.0 M
3/15/2018 7:00 AM 0.00 0.0 M 0.0 M
3/16/2018 7:00 AM 0.21 0.0 M 0.0 M RW- began at 1945 MDT 15 Mar 2018, thunder at 1950 MDT. Rain stopped at 2100 MDT. Precip 0.21".
3/17/2018 7:00 AM 0.00 0.0 M 0.0 M
3/18/2018 7:00 AM 0.00 0.0 M 0.0 M
3/19/2018 7:00 AM 0.68 0.8 M 0.7 M TRW- began ~1615 MDT 18 Mar 2018 accompanied by graupel. Temperature dropped rapidly and snow mixed with rain within an hour. 0.10" precip, included melting slush, in gauge at 1730 MDT. Rain mixed with snow until 1900 MDT, than mostly wet snow. Max accumulation 0.8" at 2200 MDT, when measurable precip ended. Additional precip 0.58" for a storm total of 0.68". 0.7" of snow on deck rails at obs time, frozen and so dense it was hard to stick a ruler into it.
3/20/2018 7:00 AM 0.00 0.0 M T M Snow remains only in well shaded areas.
3/21/2018 7:00 AM 0.00 0.0 M 0.0 M
3/22/2018 7:00 AM 0.00 0.0 M 0.0 M
3/23/2018 7:00 AM 0.00 0.0 M 0.0 M
3/24/2018 7:00 AM 0.00 0.0 M 0.0 M
3/25/2018 7:00 AM 0.00 0.0 M 0.0 M
3/26/2018 7:00 AM 0.09 0.0 M 0.0 M RW- 2215-2300 MDT 25 Mar 2018. Precip 0.09".
3/27/2018 7:00 AM 0.70 2.8 M 2.8 M R- began ~1745 MDT 26 Mar 2018. Rain changed to snow ~1900 MDT. Snow ended before 0100 MDT 27 Mar. Precip 0.70". New snow accumulation 2.8".
3/28/2018 7:00 AM 0.00 0.0 M T M Snow remains only in well shaded areas at obs time.
3/29/2018 7:00 AM 0.48 1.3 M 1.3 M RW began ~1300 MDT, changed to SW ~1400 MDT. Occasional SW1/2 thru late afternoon, then mostly S-. Snow ended by 2100 MDT. New and total accumulation 1.3". Precip 0.48"
3/30/2018 7:00 AM 0.10 T M T M R- began 1630 MDT 29 Mar 2018, quickly changed to S-, some flakes half-dollar size. Wet snow with temperature never falling below 34°. This continued until ~1945 MDT. Trace accumulation on grass. Precip 0.10".
3/31/2018 7:00 AM 0.00 0.0 M 0.0 M
4/1/2018 7:00 AM 0.01 T M T M SW- began at 0530 MDT 01 Apr 2018. S-1 at obs time. Precip 0.01", snow accumulation, a trace.
4/2/2018 7:00 AM 0.01 0.1 M 0.0 M S- in progress at start of observing period, ended by 0730 MDT 01 Apr 2018. 0.1" accumulation of slushy snow on grass, which melted by 0900 MDT. Precip 0.01".
4/3/2018 7:00 AM T 0.0 M 0.0 M Very light showers ~0030 MDT 03 Apr 2018, following passage of a Pacific cold front. Trace precip.
4/4/2018 7:00 AM 0.00 0.0 M 0.0 M
4/5/2018 7:00 AM 0.00 0.0 M 0.0 M
4/6/2018 7:00 AM 0.00 0.0 M 0.0 M
4/7/2018 7:00 AM 0.31 3.3 M 2.0 M S- began at 0930 MDT 06 Apr 2018 and continued thru the day. At 1615 MDT, 2.6” on grass, precip 0.24". Minimum visibility during snowfall 3/4 mile. Snow ended 1845 MDT. At 1910 MDT accumulation 3.2 on grass (max measured), pcpn +.06". SW- ~0600 MDT 07 April left another .01" precip and 0.1" new accumulation. 2.0" total on ground at 0700 MDT.
4/8/2018 7:00 AM 0.00 0.0 M 0.0 M
4/9/2018 7:00 AM T 0.0 M 0.0 M Brief RW-- 2330-2400 MDT 08 Apr 2018. Trace precip. RW- began at 0655 MDT 09 Apr. Only a trace by obs time at 0700 MDT, but precip increasing.
4/10/2018 7:00 AM 0.11 0.3 M 0.0 M RW- in progress at 0700 MDT 09 Apr quickly changed to rimed pellets ~0705 MDT, then S-. Snow ended 0815 MDT, accumulation 0.3", pcpn 0.11". Min 33° during snow. Bright sun by 0845 MDT. Snow melted by 1000 MDT.
4/11/2018 7:00 AM 0.00 0.0 M 0.0 M
4/12/2018 7:00 AM 0.00 0.0 M 0.0 M
4/13/2018 7:00 AM 0.01 0.0 M 0.0 M RW- between 0200 and 0230 MDT 13 Apr 2018. Precip .01".
4/14/2018 7:00 AM 0.00 0.0 M 0.0 M
4/15/2018 7:00 AM 0.00 0.0 M 0.0 M
4/16/2018 7:00 AM 0.00 0.0 M 0.0 M
4/17/2018 7:00 AM 0.00 0.0 M 0.0 M
4/18/2018 7:00 AM T 0.0 M 0.0 M A few drops of rain in the air at 1400 MDT 17 Apr 2018, blow-off from the mountains during a moderate windstorm. Trace precip.
4/19/2018 7:00 AM 0.00 0.0 M 0.0 M
4/20/2018 7:00 AM 0.00 0.0 M 0.0 M
4/21/2018 7:00 AM 0.35 0.3 M 0.3 M A few rain sprinkles from 1100-1230 MDT 20 Apr 2018. Trace precip. R- began 1530 MDT, ended about 1700 MDT. Precip .05". R- resumed ~2100 MDT. Precip +.14" by 2400 MDT. Changeover to S- occurred just after 0000 MDT 21 Apr. At 0700 MDT 21 Apr, S-2, 32 deg (minimum), precip since 0000 MDT +.16. 24-h total .35". Snow accumulation 0.3".
4/22/2018 7:00 AM 0.10 0.0 M 0.0 M S-2 at the start of the observing period. Snow quite light until ~0940 MDT 21 Apr 2018, when S-1 resumed. Wet Snow. Snow changed to R-- at 1130 MDT. Pcpn .09" from 0700 to 1130 MDT. Morning snow melted as it hit the grass. R-- continued until 1530 MDT, with .01" additional precip. All traces of snow gone by afternoon.
4/23/2018 7:00 AM 0.00 0.0 M 0.0 M
4/24/2018 7:00 AM 0.19 T M T M RW-- 1405-1415 MDT 23 Apr 2018. Trace precip. RW-- 1850- 1900 MDT barely wet pavement. Trace precip. R- began ~0030 MDT 24 Apr, probably became mixed with S- after 0230 MDT as temperature fell below 35°. Mostly snow in the early morning, much melting as it fell. Not sure if it was continuous, but by 0700 MDT, SG-- with only a trace accumulation.
4/25/2018 7:00 AM 0.23 T M 0.0 M SG-- falling at start of observing period. Light or very light precip the rest of the morning of 24 Apr 2018, mostly solid. Around 1215 MDT intermittent SW- began with larger flake size than earlier, and visibility was occasionally as low as ¾ mile. At 1300 MDT, 36°, SW-1, precip +.09" since 07 MDT. Wet snow did not stick. SW- ended by 1600 MDT but S-- continued. At 1800, S-- 3, precip since 1300 MDT +.14". Only a trace of precip fell after 1800 MDT, ending at 1845 MDT. Never more than a trace of snow on the ground all day.
4/26/2018 7:00 AM 0.00 0.0 M 0.0 M
4/27/2018 7:00 AM 0.00 0.0 M 0.0 M
4/28/2018 7:00 AM 0.00 0.0 M 0.0 M
4/30/2018 7:00 AM 0.00 0.0 M 0.0 M
5/1/2018 7:00 AM 0.01 0.0 M 0.0 M Brf RW- ~0100 MDT 01 May 2018. Precip .01". Brief RW-- 0745-0755 MDT. Trace precip.
5/2/2018 7:00 AM T 0.0 M 0.0 M Very light rain began 0650 MDT 02 May 2018. Trace precip so far.
5/3/2018 7:00 AM 1.08 0.0 M 0.0 M R-, in progress at start of observing period, ended ~1030 MDT 02 May 2018. Precip .14". R- began again ~1500 MDT, changed to L- by 1600 MDT. RW-/occasionally RW 1730 to 2030 MDT. Precip +.34". R- began again shortly after 0000 MDT 03 May. Steady R-, occasionally R, throughout the early morning. At 0700 MDT, R-, 39° (min), precip since 2030 MDT 02 May +.60. 24-h total 1.08"
5/4/2018 7:00 AM 0.58 M M M M R- in progress at start of observing period. Steady R-, occasionally R, throughout the morning of 03 May 2018. At 1230 MDT, R- still falling, precip since 0700 MDT .51". R- ended 1315 MDT. RW-1500-1515L (precip +.04"). Several brief sprinkles mid and late evening. Precip +.03". 24-h total 0.58"
5/5/2018 7:00 AM 0.00 0.0 M 0.0 M
5/6/2018 7:00 AM 0.00 0.0 M 0.0 M
5/7/2018 7:00 AM 0.00 0.0 M 0.0 M
5/8/2018 7:00 AM 0.00 0.0 M 0.0 M
5/9/2018 7:00 AM 0.00 0.0 M 0.0 M
5/10/2018 7:00 AM 0.00 0.0 M 0.0 M
5/11/2018 7:00 AM 0.00 0.0 M 0.0 M
5/12/2018 7:00 AM 0.15 0.0 M 0.0 M One rumble of thunder in cloud heard at 1525 MDT 11 May 2018. RW-- followed with medium-size drops 1530 MDT. Trace precip. Drizzle or light rain began in the wee hours of 12 May, time unknown. Drizzle falling at 0700 MDT, obs time. Precip .15".
5/13/2018 7:00 AM 0.46 0.0 M 0.0 M Drizzle falling at start and end of observing period. Drizzle ended ~1200 MDT 12 May 2018. Precip .14". RW+½ 1830-1850 MDT. Much heavier showers nearby. Surprisingly, no lightning. Intermittent R- thru 1945 MDT. At 2000 MDT, precip since noon 0.21". Occasional drizzle all night after that. Overnite precip +.11. 24-h precip 0.46".
5/14/2018 7:00 AM 0.76 0.0 M 0.0 M Drizzle at start of observing period, ended ~0930 MDT 13 May 2018. Precip .01". One distant rumble of thunder west at 1515 MDT and sprinkles. Trace precip. Brief TRW 1800 MDT and again 2000 MDT, separated by RW- (precip +.34"). At 2030 MDT, frequent lightning in clouds SW. TRW+A (hail diameter ¼”) broke at 2050 MDT, continued for about 5 min, then just TRW, slowly diminishing. Lightning flashes one per second with continuous thunder for 15 min. At 2110 MDT, frequent lightning in clouds NE, RW-, precip +.33". RW- ended by 2300 MDT (precip +.08). 24-h precip .76".
5/15/2018 7:00 AM 0.03 0.0 M 0.0 M Occasional sprinkles after 1100 MDT 14 May 2018. Trace precip. RW- began at 1815 MDT. Muted thunder heard from TRW- passing S and E of Boulder. TRW- ended ~1920 MDT. Precip .03". Clearing late.
5/16/2018 7:00 AM 0.00 0.0 M 0.0 M
5/17/2018 7:00 AM 0.00 0.0 M 0.0 M
5/18/2018 7:00 AM 0.00 0.0 M 0.0 M
5/19/2018 7:00 AM 1.45 0.0 M 0.0 M TRW- began ~1450 MDT 18 May 2018 but became TRW+A just before 1500 MDT. Heavy rain and hail continued for ~30 min, enough to whiten bare ground. Hail size mostly 1/4” but occasional stones 1/2 to 5/8” diameter. Precip 0.83" by 1523 MDT, 1.07" by 1550 MDT with TRW- still in progress. RW- ended ~1800 MDT (precip +.37). Occasional drizzle before daybreak 19 May. Precip +.01". 24-h total 1.45".
5/20/2018 7:00 AM 0.38 0.0 M 0.0 M Drizzle or light rain, measurable after 0800 MDT 19 May 2018, until about 1400 MDT. Precip 0.18". Mountain showers formed mid afternoon, moved east across south Boulder 1715-1800 MDT. Precip +.09". Occasional drizzle or light rain, all after 0000 MDT 20 May. Thick drizzle in progress at obs time, -0700 MDT. Precip + 0.11". 24-h total 0.38".
5/21/2018 7:00 AM 0.18 0.0 M 0.0 M Drizzle, in progress at start of observing period, ended by noon 20 May 2018. RW- 1600-1800 MDT. Total precip .18".
5/22/2018 7:00 AM 0.00 0.0 M 0.0 M
5/23/2018 7:00 AM 0.03 0.0 M 0.0 M TRW- 1845-1855 MDT 22 May 2018. Precip .03". Brief RW-- 2145 MDT. Trace precip.
5/24/2018 7:00 AM 0.00 0.0 M 0.0 M
5/25/2018 7:00 AM 0.00 0.0 M 0.0 M
5/26/2018 7:00 AM 0.00 0.0 M 0.0 M
5/27/2018 7:00 AM 0.00 0.0 M 0.0 M
5/28/2018 7:00 AM 0.00 0.0 M 0.0 M
5/29/2018 7:00 AM 0.04 0.0 M 0.0 M TRW- 1600-1630 MDT 28 May 2018. Precip .04".
5/30/2018 7:00 AM T 0.0 M 0.0 M A few drops of rain ~1150 MDT 29 May 2018. Trace precip.
5/31/2018 7:00 AM 0.16 0.0 M 0.0 M TRW- 1725-1805 MDT. Precip 0.16".
6/1/2018 7:00 AM 0.00 0.0 M 0.0 M
6/2/2018 7:00 AM 0.00 0.0 M 0.0 M
6/3/2018 7:00 AM 0.00 0.0 M 0.0 M
6/4/2018 7:00 AM 0.00 0.0 M 0.0 M
6/5/2018 7:00 AM 0.00 0.0 M 0.0 M
6/6/2018 7:00 AM 0.00 0.0 M 0.0 M
6/7/2018 7:00 AM 0.00 0.0 M 0.0 M
6/8/2018 7:00 AM 0.00 0.0 M 0.0 M
6/9/2018 7:00 AM 0.00 0.0 M 0.0 M
6/10/2018 7:00 AM 0.00 0.0 M 0.0 M
6/11/2018 7:00 AM 0.00 0.0 M 0.0 M
6/12/2018 7:00 AM 0.00 0.0 M 0.0 M
6/13/2018 7:00 AM 0.00 0.0 M 0.0 M
6/14/2018 7:00 AM 0.00 0.0 M 0.0 M
6/15/2018 7:00 AM 0.00 0.0 M 0.0 M
6/16/2018 7:00 AM 0.02 0.0 M 0.0 M TRW- 1320-1335 MDT 15 Jun 2018. Precip .02". RW-- for a few minutes ~1820 MDT (trace precip).
6/17/2018 7:00 AM 0.17 0.0 M 0.0 M TRW- began 1338 MDT 16 June 2018L, then TRW+A (hail 1/8" in diameter) for about five minutes at 1342 MDT. Rain tapered off and ended by 1350 MDT. Precip 0.16". RW- 1515-1530L. Precip +.01".
6/18/2018 7:00 AM 0.67 0.0 M 0.0 M Occasional RW- 1100-1400 MDT 17 June 2018 (.08"). R- 1500-1730 MDT (+.26"). R- 1930-2040 MDT (+.10"). R- 2240-2350 MDT (+.23"). 24-h total precip 0.67".
6/19/2018 7:00 AM 0.39 0.0 M 0.0 M Drizzle in progress at start of observing period. Occasional drizzle ended 1045 MDT 18 Jun 2018. Precip .08". Three early evening thunderstorms. The first began ~1800 MDT and the last ended ~ 2000 MDT. These three storms brought only +.18" precip at home but over an inch of rain and hail just a few miles north. The first two also brought hail, with a very few stones up to 3/4" in diameter. No damage to garden. R- from 0400-0430 MDT. Precip (+.13).
6/20/2018 7:00 AM 0.01 0.0 M 0.0 M RW-- big drops, at 1458 MDT 19 Jun. Trace precip. RW- 2010-2020 MDT, precip .01".
6/21/2018 7:00 AM 0.00 0.0 M 0.0 M
6/22/2018 7:00 AM T 0.0 M 0.0 M Brief RW-- at 1655 MDT 21 June 2018. Trace precip.
6/23/2018 7:00 AM T 0.0 M 0.0 M RW-- 0945-0955 MDT 22 Jun 2018, accompanied by strong outflow winds from the SW with gusts 40-50 mph, 0910 to 0950 MDT. Trace precip.
6/24/2018 7:00 AM 0.00 0.0 M 0.0 M
6/25/2018 7:00 AM 0.03 0.0 M 0.0 M TRW- 1105-1230 MDT 24 June 2018. Precip .03".
6/26/2018 7:00 AM 0.00 0.0 M 0.0 M
6/27/2018 7:00 AM 0.00 0.0 M 0.0 M
6/28/2018 7:00 AM T 0.0 M 0.0 M TRW-- 1500-1510 MDT 27 Jun 2018. Trace precip.
6/29/2018 7:00 AM 0.00 0.0 M 0.0 M
6/30/2018 7:00 AM 0.00 0.0 M 0.0 M
7/1/2018 7:00 AM 0.07 M M M M Intermittent RW- 1540-1745 MDT 30 June 2018. Precip .07".
7/2/2018 7:00 AM 0.00 0.0 M M M
7/3/2018 7:00 AM 0.00 0.0 M M M
7/4/2018 7:00 AM 0.02 M M M M RW- 1318-1323 MDT 03 July 2018 from very high-based cloud--a bit unusual. Cloud base probably near 500 mb.
7/5/2018 7:00 AM 0.01 M M M M TRW- 2140-2150 MDT 04 July 2018. Lightning within four miles of Folsom Stadium in Boulder delayed start of fireworks display for 30 minutes.
7/6/2018 7:00 AM 0.19 M M M M TRW 1815-1830 MDT 05 July 2018. Precip 0.19".
7/7/2018 7:00 AM 0.00 0.0 M M M
7/8/2018 7:00 AM 0.00 0.0 M M M
7/9/2018 7:00 AM 0.00 0.0 M M M
7/11/2018 7:00 AM 0.00 0.0 M M M
7/12/2018 7:00 AM 0.00 0.0 M M M
7/13/2018 7:00 AM 0.02 M M M M RW- 1320-1350 MDT 12 Jul 2018. Precip .02".
7/14/2018 7:00 AM 0.00 0.0 M M M
7/15/2018 7:00 AM 0.00 0.0 M M M
7/16/2018 7:00 AM 0.28 M M M M A few sprinkles 1000-1300 MDT 15 July 2018 (trace precip). RW- 1415-1515 MDT (precip 0.16"). Occasional R- 1700-1830 MDT (precip +.12").
7/17/2018 7:00 AM 0.00 0.0 M M M
7/18/2018 7:00 AM T M M M M Brief RW-- 1840-1845 MDT 17 July 2018. Trace precip.
7/19/2018 7:00 AM 0.00 0.0 M M M
7/20/2018 7:00 AM 0.00 0.0 M M M
7/21/2018 7:00 AM 0.00 0.0 M M M
7/22/2018 7:00 AM 0.01 0.0 M 0.0 M RW- 1600-1615 MDT 21 July 2018. Precip .01".
7/23/2018 7:00 AM 0.09 M M M M RW- 1430-1440 MDT 22 July 2018(precip .02), then TRW- 1600-1630 MDT (precip +.03). Second storm promised a good shower but collapsed just a mile or two W and SW. RW- 2030-2045 MDT (precip +.02) and 2230-2245 MDT (precip +.02). 24-h total 0.09".
7/24/2018 7:00 AM 0.38 M M M M TRW- 1515-1545 MDT, 23 July 2018 (precip .08"). TRW- 1650-1715 MDT with thunder heard a couple of times, then RW- 1800-1845 MDT (precip +.09") and occasional sprinkles into the evening. More thunder at 20 MDT. TRW 2010-2030L (+.20). RW- 2220-2230 (+.01). 24-hour total .38".
7/25/2018 7:00 AM T M M M M Brief sprinkle 1430-1440 MDT 24 July 2018. Trace precip.
7/26/2018 7:00 AM 0.14 M M M M RW- 1610-1625 MDT 25 Jul 1028. Precip .02". TRW- 0200-0215 MDT 26 July. Precip +.12".
7/27/2018 7:00 AM 0.21 M M M M TRW+ 2135-2147 MDT 26 July 2018. Precip 0.21".
7/28/2018 7:00 AM 0.06 M M M M RW-- 0735-0745 MDT 27 Jul 2018, just light sprinkles. Trace precip. Intermittent RW 1530-1550 MDT. Precip 0.06".
7/29/2018 7:00 AM 0.04 M M M M TRW- 1745-1800 MDT 28 Jul 2018. Precip .04".
7/30/2018 7:00 AM 0.01 M M M M RW- 0000-0015 MDT 30 Jul 2018. Precip .01".
7/31/2018 7:00 AM 0.00 0.0 M M M
8/1/2018 7:00 AM 0.00 0.0 M M M
8/2/2018 7:00 AM 0.00 0.0 M M M
8/3/2018 7:00 AM 0.00 0.0 M M M
8/4/2018 7:00 AM 0.01 M M M M Sprinkles or RW- late morning, afternoon, and late evening on 03 July 2018. Measurable precip .01" only in early afternoon.
8/5/2018 7:00 AM 0.00 0.0 M M M
8/6/2018 7:00 AM 0.02 M M M M Two separate RW- between 1330 and 1500 MDT 05 Aug 2018. Precip .02".
8/7/2018 7:00 AM 0.00 0.0 M M M
8/8/2018 7:00 AM 0.00 0.0 M M M
8/9/2018 7:00 AM 0.00 0.0 M M M
8/10/2018 7:00 AM 0.00 0.0 M M M
8/11/2018 7:00 AM 0.00 0.0 M M M
8/12/2018 7:00 AM 0.00 0.0 M M M
8/13/2018 7:00 AM 0.00 0.0 M M M
8/14/2018 7:00 AM 0.00 0.0 M M M
8/15/2018 7:00 AM 0.04 M M M M RW- 1505-1510 MDT 14 Aug 2018. Precip .01". Thunder 1530-1600L with RW-- ~1600 MDT. Trace precip. Scattered TRW- in the area until after 2100 MDT, but only +.03" of rain here thru 2100 MDT.
8/16/2018 7:00 AM 0.00 0.0 M M M
8/17/2018 7:00 AM 0.00 0.0 M M M
8/18/2018 7:00 AM 0.00 0.0 M M M
8/19/2018 7:00 AM 0.22 M M M M RW-- 1200-1230 MDT 18 Aug 2018. Trace precip. A small thunderstorm cell produced .08" rain from 2005-2010 MDT. Then TRW 2155-2210 MDT (precip +.14).
8/20/2018 7:00 AM 0.01 M M M M Brief RW-- at 1450 MDT 19 Aug 2018. Trace precip. RW- 1600-1610 MDT. Precip 0.01".
8/21/2018 7:00 AM T M M M M RW-- 0650-0700 MDT 23 Aug 2018. Trace precip.
8/22/2018 7:00 AM 0.02 M M M M RW- 0030-0130 MDT 22 Aug 2016. Precip .02".
8/23/2018 7:00 AM 0.00 0.0 M M M
8/24/2018 7:00 AM 0.00 0.0 M M M
8/25/2018 7:00 AM 0.00 0.0 M M M
8/26/2018 7:00 AM 0.00 0.0 M M M
8/27/2018 7:00 AM 0.00 0.0 M M M
8/28/2018 7:00 AM 0.00 0.0 M M M
8/29/2018 7:00 AM 0.00 0.0 M M M
8/30/2018 7:00 AM 0.00 0.0 M M M
8/31/2018 7:00 AM 0.00 0.0 M M M
9/1/2018 7:00 AM 0.00 0.0 M 0.0 M
9/2/2018 7:00 AM T 0.0 M 0.0 M A few drops of rain around 1630 MDT. Trace precip.
9/3/2018 7:00 AM 0.00 0.0 M 0.0 M
9/4/2018 7:00 AM 0.00 0.0 M 0.0 M
9/5/2018 7:00 AM 0.80 0.0 M 0.0 M TRW- began ~0000 MDT 05 Sep 2018. Then from 0100 thru 0500 MDT R- R and occasionally R+. Precip .80".
9/6/2018 7:00 AM 0.06 0.0 M 0.0 M TRW-- 1400-1500 MDT 05 Sep 2018. Trace precip. RW- early 06 Sep, time unknown. Precip .06".
9/7/2018 7:00 AM 0.03 0.0 M 0.0 M TRW- around 1530 MDT 06 Sep 2018. Precip .03".
9/8/2018 7:00 AM 0.00 0.0 M 0.0 M
9/9/2018 7:00 AM 0.00 0.0 M 0.0 M
9/10/2018 7:00 AM 0.00 0.0 M 0.0 M
9/11/2018 7:00 AM 0.00 0.0 M 0.0 M
9/12/2018 7:00 AM T 0.0 M 0.0 M RW--, a few drops at 1305 MDT 11 Sep 2018. Trace precip.
9/13/2018 7:00 AM 0.00 0.0 M 0.0 M
9/14/2018 7:00 AM 0.00 0.0 M 0.0 M
9/15/2018 7:00 AM 0.00 0.0 M 0.0 M
9/16/2018 7:00 AM 0.00 0.0 M 0.0 M
9/17/2018 7:00 AM 0.00 0.0 M 0.0 M
9/18/2018 7:00 AM 0.00 0.0 M 0.0 M
9/19/2018 7:00 AM 0.00 0.0 M 0.0 M
9/20/2018 7:00 AM 0.02 0.0 M 0.0 M Rain sprinkles ~1630MDT 19 Sep 2018 slightly dampened pavement. Trace precip. RW--/RW- 2030-2400 MDT. Precip .02".
9/21/2018 7:00 AM 0.00 0.0 M 0.0 M
9/22/2018 7:00 AM 0.00 0.0 M 0.0 M
9/23/2018 7:00 AM 0.00 0.0 M 0.0 M
9/24/2018 7:00 AM 0.00 0.0 M 0.0 M
9/25/2018 7:00 AM T 0.0 M 0.0 M A few drops of rain ~1000 MDT 24 Sep 2018. Trace precip. Band of sprinkles passed over south Boulder 1500-1530 MDT with very gusty outflow winds, SW to W with gusts to 35 mph. Sprinkles dampened but did not wet pavement. Trace precip.
9/26/2018 7:00 AM 0.00 0.0 M 0.0 M
9/27/2018 7:00 AM 0.00 0.0 M 0.0 M
9/28/2018 7:00 AM 0.00 0.0 M 0.0 M
9/29/2018 7:00 AM 0.00 0.0 M 0.0 M
9/30/2018 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