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 11 1.39 1.56 31 1.56 31 0.00 0 0 4 4 11.0 2 5
Nov 11 1.04 0.98 30 0.98 30 0.00 0 0 4 1 9.6 2 4
Dec 11 0.79 1.88 31 1.88 31 0.00 0 0 8 1 30.8 8 30
Jan 12 0.64 0.37 31 0.37 31 0.00 0 0 5 1 8.4 5 6
Feb 12 0.63 1.75 29 1.75 29 0.00 0 0 6 7 27.3 6 23
March 12 1.86 0.01 31 0.01 31 0.00 0 0 1 5 0.0 0 0
April 12 2.34 1.44 30 1.44 30 0.00 0 0 6 2 1.5 1 1
May 12 2.66 1.74 31 1.74 31 0.00 0 0 7 2 0.0 0 0
June 12 2.16 0.35 30 0.35 30 0.00 0 0 8 5 0.0 0 0
July 12 1.67 4.48 31 4.48 31 0.00 0 0 14 3 0.0 0 0
Aug 12 1.76 0.22 31 0.22 31 0.00 0 0 4 3 0.0 0 0
Sept 12 1.61 2.30 30 2.30 30 0.00 0 0 10 0 0.0 0 0
Water Year Totals: 18.55" 17.08" 366 days 17.08" 366 0.00" 0 days 0 77 days 34 days 88.6" 24 days 69 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
10/1/2011 0.00
10/2/2011 0.00
10/3/2011 0.00
10/4/2011 0.00
10/5/2011 T
10/6/2011 0.00
10/7/2011 T
10/8/2011 0.06
10/9/2011 0.20
10/10/2011 T
10/11/2011 0.00
10/12/2011 0.00
10/13/2011 0.00
10/14/2011 0.00
10/15/2011 0.00
10/16/2011 0.00
10/17/2011 0.00
10/18/2011 T
10/19/2011 0.00
10/20/2011 0.00
10/21/2011 0.00
10/22/2011 0.00
10/23/2011 0.00
10/24/2011 0.00
10/25/2011 0.00
10/26/2011 1.00
10/27/2011 0.30
10/28/2011 0.00
10/29/2011 0.00
10/30/2011 0.00
10/31/2011 0.00
11/1/2011 0.00
11/2/2011 0.90
11/3/2011 0.05
11/4/2011 0.00
11/5/2011 0.00
11/6/2011 0.00
11/7/2011 0.00
11/8/2011 0.00
11/9/2011 0.00
11/10/2011 0.00
11/11/2011 0.00
11/12/2011 0.00
11/13/2011 0.00
11/14/2011 0.01
11/15/2011 0.00
11/16/2011 0.00
11/17/2011 0.00
11/18/2011 0.00
11/19/2011 T
11/20/2011 0.00
11/21/2011 0.00
11/22/2011 0.00
11/23/2011 0.00
11/24/2011 0.00
11/25/2011 0.00
11/26/2011 0.02
11/27/2011 0.00
11/28/2011 0.00
11/29/2011 0.00
11/30/2011 0.00
12/1/2011 0.41
12/2/2011 0.16
12/3/2011 0.23
12/4/2011 0.06
12/5/2011 0.04
12/6/2011 T
12/7/2011 0.00
12/8/2011 0.00
12/9/2011 0.00
12/10/2011 0.00
12/11/2011 0.00
12/12/2011 0.00
12/13/2011 0.00
12/14/2011 0.00
12/15/2011 0.00
12/16/2011 0.00
12/17/2011 0.00
12/18/2011 0.00
12/19/2011 0.00
12/20/2011 0.06
12/21/2011 0.00
12/22/2011 0.86
12/23/2011 0.06
12/24/2011 0.00
12/25/2011 0.00
12/26/2011 0.00
12/27/2011 0.00
12/28/2011 0.00
12/29/2011 0.00
12/30/2011 0.00
12/31/2011 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2012 0.00
1/2/2012 0.00
1/3/2012 0.00
1/4/2012 0.00
1/5/2012 0.00
1/6/2012 0.00
1/7/2012 0.00
1/8/2012 0.08
1/9/2012 0.00
1/10/2012 0.00
1/11/2012 T
1/12/2012 0.18
1/13/2012 0.00
1/14/2012 0.00
1/15/2012 0.00
1/16/2012 0.00
1/17/2012 0.05
1/18/2012 0.00
1/19/2012 0.00
1/20/2012 0.00
1/21/2012 0.00
1/22/2012 0.00
1/23/2012 0.00
1/24/2012 0.00
1/25/2012 0.02
1/26/2012 0.00
1/27/2012 0.00
1/28/2012 0.04
1/29/2012 0.00
1/30/2012 0.00
1/31/2012 0.00
2/1/2012 0.00
2/2/2012 0.00
2/3/2012 0.90
2/4/2012 0.39
2/5/2012 T
2/6/2012 0.00
2/7/2012 0.10
2/8/2012 0.01
2/9/2012 0.00
2/10/2012 0.00
2/11/2012 0.09
2/12/2012 T
2/13/2012 0.00
2/14/2012 0.00
2/15/2012 0.00
2/16/2012 T
2/17/2012 0.00
2/18/2012 T
2/19/2012 0.00
2/20/2012 T
2/21/2012 0.00
2/22/2012 0.00
2/23/2012 0.26
2/24/2012 T
2/25/2012 0.00
2/26/2012 0.00
2/27/2012 0.00
2/28/2012 0.00
2/29/2012 T
3/1/2012 0.00
3/2/2012 T
3/3/2012 T
3/4/2012 0.00
3/5/2012 0.00
3/6/2012 0.00
3/7/2012 T
3/8/2012 0.01
3/9/2012 0.00
3/10/2012 0.00
3/11/2012 0.00
3/12/2012 T
3/13/2012 0.00
3/14/2012 0.00
3/15/2012 0.00
3/16/2012 0.00
3/17/2012 0.00
3/18/2012 0.00
3/19/2012 T
3/20/2012 0.00
3/21/2012 0.00
3/22/2012 0.00
3/23/2012 0.00
3/24/2012 0.00
3/25/2012 0.00
3/26/2012 0.00
3/27/2012 0.00
3/28/2012 0.00
3/29/2012 0.00
3/30/2012 0.00
3/31/2012 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2012 0.00
4/2/2012 0.00
4/3/2012 0.15
4/4/2012 0.35
4/5/2012 0.00
4/6/2012 0.00
4/7/2012 0.00
4/8/2012 0.00
4/9/2012 0.00
4/10/2012 0.00
4/11/2012 0.00
4/12/2012 0.26
4/13/2012 T
4/14/2012 0.00
4/15/2012 0.56
4/16/2012 0.10
4/17/2012 0.00
4/18/2012 0.00
4/19/2012 0.00
4/20/2012 0.00
4/21/2012 0.00
4/22/2012 0.00
4/23/2012 0.00
4/24/2012 0.00
4/25/2012 0.00
4/26/2012 0.00
4/27/2012 0.02
4/28/2012 T
4/29/2012 0.00
4/30/2012 0.00
5/1/2012 0.00
5/2/2012 0.00
5/3/2012 0.00
5/4/2012 0.00
5/5/2012 0.00
5/6/2012 0.00
5/7/2012 0.50
5/8/2012 0.38
5/9/2012 0.00
5/10/2012 0.00
5/11/2012 0.00
5/12/2012 0.18
5/13/2012 0.07
5/14/2012 0.00
5/15/2012 0.00
5/16/2012 0.00
5/17/2012 0.00
5/18/2012 0.02
5/19/2012 T
5/20/2012 0.14
5/21/2012 T
5/22/2012 0.00
5/23/2012 0.00
5/24/2012 0.45
5/25/2012 0.00
5/26/2012 0.00
5/27/2012 0.00
5/28/2012 0.00
5/29/2012 0.00
5/30/2012 0.00
5/31/2012 0.00
6/1/2012 0.00
6/2/2012 T
6/3/2012 T
6/4/2012 T
6/5/2012 0.00
6/6/2012 0.00
6/7/2012 0.09
6/8/2012 0.01
6/9/2012 0.00
6/10/2012 0.00
6/11/2012 0.00
6/12/2012 0.00
6/13/2012 0.00
6/14/2012 0.00
6/15/2012 0.02
6/16/2012 T
6/17/2012 T
6/18/2012 0.00
6/19/2012 0.00
6/20/2012 0.00
6/21/2012 0.00
6/22/2012 0.00
6/23/2012 0.00
6/24/2012 0.00
6/25/2012 0.02
6/26/2012 0.00
6/27/2012 0.02
6/28/2012 0.07
6/29/2012 0.09
6/30/2012 0.03
Day of YearDaily PrcpMultiday Prcp
7/1/2012 0.00
7/2/2012 0.00
7/3/2012 0.08
7/4/2012 0.00
7/5/2012 0.00
7/6/2012 0.24
7/7/2012 0.40
7/8/2012 1.72
7/9/2012 0.67
7/10/2012 0.20
7/11/2012 0.00
7/12/2012 0.00
7/13/2012 0.03
7/14/2012 0.00
7/15/2012 0.00
7/16/2012 T
7/17/2012 0.61
7/18/2012 0.00
7/19/2012 0.00
7/20/2012 0.00
7/21/2012 0.00
7/22/2012 0.00
7/23/2012 0.04
7/24/2012 0.07
7/25/2012 0.08
7/26/2012 0.01
7/27/2012 0.00
7/28/2012 T
7/29/2012 T
7/30/2012 0.12
7/31/2012 0.21
8/1/2012 0.00
8/2/2012 0.05
8/3/2012 0.01
8/4/2012 0.00
8/5/2012 0.00
8/6/2012 0.00
8/7/2012 0.00
8/8/2012 0.00
8/9/2012 0.00
8/10/2012 0.00
8/11/2012 T
8/12/2012 0.13
8/13/2012 0.00
8/14/2012 0.00
8/15/2012 0.00
8/16/2012 T
8/17/2012 T
8/18/2012 0.00
8/19/2012 0.00
8/20/2012 0.00
8/21/2012 0.00
8/22/2012 0.00
8/23/2012 0.03
8/24/2012 0.00
8/25/2012 0.00
8/26/2012 0.00
8/27/2012 0.00
8/28/2012 0.00
8/29/2012 0.00
8/30/2012 0.00
8/31/2012 0.00
9/1/2012 0.00
9/2/2012 0.03
9/3/2012 0.02
9/4/2012 0.00
9/5/2012 0.00
9/6/2012 0.00
9/7/2012 0.04
9/8/2012 0.08
9/9/2012 0.01
9/10/2012 0.00
9/11/2012 0.00
9/12/2012 0.78
9/13/2012 0.47
9/14/2012 0.00
9/15/2012 0.00
9/16/2012 0.00
9/17/2012 0.00
9/18/2012 0.00
9/19/2012 0.00
9/20/2012 0.00
9/21/2012 0.00
9/22/2012 0.00
9/23/2012 0.00
9/24/2012 0.00
9/25/2012 0.00
9/26/2012 0.43
9/27/2012 0.40
9/28/2012 0.04
9/29/2012 0.00
9/30/2012 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2011 7:00 AM 0.00 0.0 M 0.0 M
10/2/2011 7:00 AM 0.00 0.0 M 0.0 M
10/3/2011 7:00 AM 0.00 0.0 M 0.0 M
10/4/2011 7:00 AM 0.00 0.0 M 0.0 M
10/5/2011 7:00 AM T 0.0 M 0.0 M Light showers ~ 1600 and again 1800 MDT, 04 Oct 2011. Trace precipitation.
10/6/2011 7:00 AM 0.00 0.0 M 0.0 M
10/7/2011 7:00 AM T 0.0 M 0.0 M Narrow band of showers and mid-tropospheric short wave moved rapidly E across Boulder 1430-1500 MDT 06 Oct 2011 with strong gusty winds 40-45 mph. Measurable rain on foothills and west edge of town but not farther east, including my location. Just a trace of precip recorded, but brilliant rainbow, low in the sky as seen from west edge of town.
10/8/2011 7:00 AM 0.06 0.0 M 0.0 M R- began 0530 MDT 08 Oct 2011 but became R-- by obs time (0700 MDT). Pcpn so far .06".
10/9/2011 7:00 AM 0.20 0.0 M 0.0 M R-- in progress at start of observing period. R- or R--, with short breaks, until 1445 MDT 08 Oct 2011, when pcpn ceased. .20" fell since 0700 MDT.
10/10/2011 7:00 AM T 0.0 M 0.0 M A few drops of rain, barely perceptible, ~1730 MDT 09 Oct 2011. Trace precip. First freeze at sunrise (0700 MDT 10 Oct). Min temperature 32 deg F.
10/11/2011 7:00 AM 0.00 0.0 M 0.0 M
10/12/2011 7:00 AM 0.00 0.0 M 0.0 M
10/13/2011 7:00 AM 0.00 0.0 M 0.0 M
10/14/2011 7:00 AM 0.00 0.0 M 0.0 M
10/15/2011 7:00 AM 0.00 0.0 M 0.0 M
10/16/2011 7:00 AM 0.00 0.0 M 0.0 M
10/17/2011 7:00 AM 0.00 0.0 M 0.0 M
10/18/2011 7:00 AM T 0.0 M 0.0 M RW-- 0700-0730 MDT 17 Oct 2011. Trace precip.
10/19/2011 7:00 AM 0.00 0.0 M 0.0 M First sub-freezing temperature of the year, 27 deg F at dawn, 19 Oct 2011.
10/20/2011 7:00 AM 0.00 0.0 M 0.0 M
10/21/2011 7:00 AM 0.00 0.0 M 0.0 M
10/22/2011 7:00 AM 0.00 0.0 M 0.0 M
10/23/2011 7:00 AM 0.00 0.0 M 0.0 M
10/24/2011 7:00 AM 0.00 0.0 M 0.0 M
10/25/2011 7:00 AM 0.00 0.0 M 0.0 M
10/26/2011 7:45 AM 1.00 8.5 M 8.5 M R- began 1620 MDT 25 Oct 2011, changed to S- at 2045 MDT and continued without letup, sometimes moderate, through the observing time this morning at 0745 MDT. Total precip 1.00", of which 0.11" fell as rain. Accumulation: 0.5" at 2200 MDT, 3.5" at 0130 MDT 26 Oct, 7.0" at 0430 MDT, and 8.5" at 0745 MDT. This was a fairly heavy and wet snow, most of which fell with the temperature only a degree or two below freezing. Many branches down, mostly silver maples, which still had leaves. This was the first snow of the season.
10/27/2011 7:00 AM 0.30 2.5 M 8.5 M Measurable snow fell from obs time, 0745 MDT 26 Oct 2011, until about 1100 MDT, with visibility under one mile. After that, snow very gradually tapered off, ending by 1600 MDT. .30" precip since 0745 MDT. Storm total 1.30". Max depth 11.0" measured at 1400 MDT. 8.5" depth at obs time today. Min temp at 0700 MDT 27 Oct was 13.5 deg F. The record min for this date in Boulder is 21 deg F, so the official reading (unknown at this time) will very likely set a new record.
10/28/2011 7:00 AM 0.00 0.0 M 6.0 M
10/29/2011 7:00 AM 0.00 0.0 M 3.5 M No snow under trees, which were mostly in leaf when snow fell. Trees intercepted almost all the snow that fell on them.
10/30/2011 7:00 AM 0.00 0.0 M 2.0 M 40% of ground bare in open areas.
10/31/2011 7:00 AM 0.00 0.0 M T M Trace of snow remains in shady areas.
11/1/2011 7:00 AM 0.00 0.0 M 0.0 M
11/2/2011 7:00 AM 0.90 9.1 M 9.1 M First raindrops fell 1755 MDT 01 Nov 2011. R- by 1830 MDT. TR- 1915-1935 MDT. 4-5 flashes of lightning, and thunder at least twice. Another lightning flash and thunder at 2030 MDT, by which time precip became mixed rain and snow. All snow S1/2 by 2035 MDT, which continued until after 0200 MDT 02 Nov. S-3/4 thereafter. At 0200 MDT, S1/2, 28 deg F, 7.0" on the ground. At obs time, 0700 MDT 02 Feb, S-1, 26 deg F (min), 9.1" accumulation (max so far). The first 0.13" precip fell as rain, then 0.77" fell as snow for a storm total so far of 0.90".
11/3/2011 7:00 AM 0.05 0.5 M 6.0 M S- continued accumulating until ~0900 MDT 02 Nov 2011. Then snow very light, ending at 1100 MDT. Depth at 1000 MDT was 9.6", max measured, with 0.5" new falling since 0700 MDT 02 Nov.
11/4/2011 7:00 AM 0.00 0.0 M 4.0 M 4.0" of snow remains on ground.
11/5/2011 7:00 AM 0.00 0.0 M 2.5 M 2.5" of crusty snow remains on ground. 80% coverage in open areas.
11/6/2011 7:00 AM 0.00 0.0 M T M About an inch of snow remains in shady areas. Open ground became bare during the afternoon of 05 Nov 2011.
11/7/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
11/8/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
11/9/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
11/10/2011 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
11/11/2011 7:00 AM 0.00 0.0 M T M Snow remains in well-shaded areas.
11/12/2011 7:00 AM 0.00 0.0 M 0.0 M
11/13/2011 7:00 AM 0.00 0.0 M 0.0 M Downslope windstorm mid-morning through mid afternoon, 12 Nov 2011. Peak gusts estimated at 60 mph in our neighborhood. Trees had been extensively pruned by late October snowstorm, so damage from wind was minimal. Lots of small litter to pick up.
11/14/2011 7:00 AM 0.01 0.0 M 0.0 M Brief RW- 1925-1935 MST, 13 Nov 2011. Precip .01".
11/15/2011 7:00 AM 0.00 0.0 M 0.0 M
11/16/2011 7:00 AM 0.00 0.0 M 0.0 M
11/17/2011 7:00 AM 0.00 0.0 M 0.0 M
11/18/2011 7:00 AM 0.00 0.0 M 0.0 M
11/19/2011 7:00 AM T 0.0 M 0.0 M A few flakes of snow in the air prior to obs time (0700 MST 19 Nov 2011. Trace precip.
11/20/2011 7:00 AM 0.00 0.0 M 0.0 M
11/21/2011 7:00 AM 0.00 0.0 M 0.0 M
11/22/2011 7:00 AM 0.00 0.0 M 0.0 M
11/23/2011 7:00 AM 0.00 0.0 M 0.0 M
11/24/2011 7:00 AM 0.00 0.0 M 0.0 M
11/25/2011 7:00 AM 0.00 0.0 M 0.0 M
11/26/2011 7:00 AM 0.02 0.0 M 0.0 M RW- 1700-1830 MST 25 Nov 2011. Precip 0.02".
11/27/2011 7:00 AM 0.00 0.0 M 0.0 M
11/28/2011 7:00 AM 0.00 0.0 M 0.0 M
11/29/2011 7:00 AM 0.00 0.0 M 0.0 M
11/30/2011 7:00 AM 0.00 0.0 M 0.0 M
12/1/2011 7:15 AM 0.41 7.1 M 7.1 M Snow began about 2330 MST 30 Nov 2011, continued all night at mostly moderate intensity. At obs time, 0715 MST, 01 Dec 2011, S1/2 continues, precip 0.41, snow depth 7.1" Though my water content was comparable with other CoCORAHS reports in S Boulder, my snow depth was about 1.5" more than at other nearby CoCORAHS sites, something I cannot explain. The 7.1" measurement is an average from both back and front yards in exposed areas.
12/2/2011 7:00 AM 0.16 1.2 M 7.0 M Moderate snow was falling at obs time 01 Dec 2011, became light by 1000 MST, and ended at 1330 MST. Precip since 0715 MST 0.16". New accumulation 1.2". Maximum accumulation at 1230 MST: 8.3". 7.0" left at 0700 MST 02 Dec 2011.
12/3/2011 7:00 AM 0.23 5.8 M 10.5 M Steady S- began after 2300 MST 02 Dec 2011 and continued thru obs time. At 0700 MST 03 Dec, S-3/4, aggregates of dendrites, 5.8" new snow, so fluffy I was able to sweep it off the sidewalk with a broom, 10.5" on the ground. Precip so far 0.23".
12/4/2011 7:00 AM 0.06 1.7 M 7.0 M S- from 0700 MST 03 Dec 2011 to 1000 MST, but snow mostly very light after that, ending at noon. New accumulation 1.7". Max on ground 11.5" at 0920 MST. Precip since 0700 MST .06". At obs time 04 Dec 0700 MST, 7.0" on the ground
12/5/2011 7:00 AM 0.04 0.8 M 7.5 M A few flakes in the air starting at 1545 MST 04 Dec. Steady S- started at 1615 MST. S-, occasionally S--, until 2230 MST. New snow 0.8". Precip .04". Total on ground at 0700 MST 05 Dec 2011: 7.5".
12/6/2011 7:00 AM T T M 6.0 M Minute ice crystals in the air 0700-1000 MST 05 Dec 2011. Trace precip.
12/7/2011 7:00 AM 0.00 0.0 M 6.0 M
12/8/2011 7:00 AM 0.00 0.0 M 4.5 M
12/9/2011 7:00 AM 0.00 0.0 M 4.0 M
12/10/2011 7:00 AM 0.00 0.0 M 4.0 M Very little snow melted yesterday. Still 4.0" snow on the ground at 0700 MST 10 Dec 2011.
12/11/2011 7:00 AM 0.00 0.0 M 3.5 M
12/12/2011 7:00 AM 0.00 0.0 M 3.0 M
12/13/2011 7:00 AM 0.00 0.0 M 3.0 M
12/14/2011 7:00 AM 0.00 0.0 M 3.0 M
12/15/2011 7:00 AM 0.00 0.0 M 3.0 M
12/16/2011 7:00 AM 0.00 0.0 M 3.0 M
12/17/2011 7:00 AM 0.00 0.0 M 2.5 M
12/18/2011 7:00 AM 0.00 0.0 M 2.5 M
12/19/2011 7:00 AM 0.00 0.0 M 2.0 M Large areas around trees are bare of snow. Likewise for open grassy areas where many feet compacted the snow. Elsewhere, however, 80% of ground still covered with crusty snow.
12/20/2011 7:00 AM 0.06 0.7 M 2.5 M S-- began 1000 MST 19 Dec 2011. S- with visibility 2-3 miles through the day, ending 2100 MST. New snow 0.7". Total on the ground at obs time 2.5"
12/21/2011 7:00 AM 0.00 0.0 M 2.5 M
12/22/2011 7:10 AM 0.86 12.5 M 15.5 M S- began 1700 MST 21 Dec 2011. S+ 1930-2000 MST, delivering an estimated 1.5" in 30 min. S1/2 2000-2100 MST, then S- til 2230L. S1/2 the rest of the night. By 2220 MST, 3.9" new snow, pcpn so far 0.24. By 0225 MST 22 Dec 9.5" new snow, pcpn +0.37. By 0710 MST 22 Dec, 12.5" new snow, total of 15.5 on the ground, pcpn +.25, for a storm total so far of 0.86
12/23/2011 7:00 AM 0.06 1.0 M 14.0 M Snowfall became light by 0730 MST 22 Dec. Measurable snow ended by 1000 MST, at which time maximum depth was measured: 13.5" new snow, total on the ground 16.5". S-- from 1000 to 1200 MST. Pcpn since 0710 MST 22 Dec til the end of snowfall was 0.06". Snowfall since 0710 MST was 1.0". 14.0" of snow on the ground at 0700 MST 23 Dec.
12/24/2011 7:00 AM 0.00 0.0 M 12.0 M
12/25/2011 7:00 AM 0.00 0.0 M 11.0 M
12/26/2011 7:00 AM 0.00 0.0 M 10.0 M
12/27/2011 7:00 AM 0.00 0.0 M 9.0 M
12/28/2011 7:00 AM 0.00 0.0 M 8.0 M
12/29/2011 7:00 AM 0.00 0.0 M 5.0 M
12/30/2011 7:00 AM 0.00 0.0 M 2.0 M Chinook wind melted a lot of snow yesterday. As of observation time, only 2.0" remains, and that is patchy. About 60% of open ground remains snow-covered.
12/31/2011 7:00 AM 0.00 0.0 M T M Continuous warm chinook wind melted much of remaining snow cover during the day on 30 Dec 2011. Snow cover in open areas reduced to 30% during the day, following 29 consecutive days of more than 50% coverage.
1/1/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/2/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/3/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/4/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/5/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/6/2012 7:00 AM 0.00 0.0 M T M Snow remains in well shaded areas.
1/7/2012 7:00 AM 0.00 0.0 M T M Snow remains in well shaded areas.
1/8/2012 7:00 AM 0.08 1.6 M 1.5 M A few small rimed pellets of snow fell late morning 07 Jan 2012. Trace precip. S- began 1445 MST, continued until 2000 MST. 1.6" accumulated on the grass, but only 1.0" on redwood deck rails. Precip .08". 1.5" on the grass at observation time.
1/9/2012 7:00 AM 0.00 0.0 M T M Snow that fell on 08 Jan 2012 mostly melted the same day. This morning, snow remains in shaded areas and perhaps in 40% of open grassy areas.
1/10/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/11/2012 7:00 AM T T M T M S- began at 0620 MST, 11 Jan 2012. Trace precip. Trace accumulation. A trace of old snow had remained in shaded areas before the current snowfall began.
1/12/2012 7:00 AM 0.18 5.0 M 3.0 M Moderate snow continued yesterday morning (11 Jan 2012), ending by 1500 MST. Max accumulation at 1500 MST, 5.0", very fluffy. Melted equivalent 0.18". Snow depth had settled to 3.0" by obs time today (12 Jan 2012).
1/13/2012 7:00 AM 0.00 0.0 M 1.0 M
1/14/2012 7:00 AM 0.00 0.0 M T M Snow remains in shaded areas.
1/15/2012 7:00 AM 0.00 0.0 M T M Patchy snow remains in shaded areas.
1/16/2012 7:00 AM 0.00 0.0 M T M Patchy snow remains in shaded areas.
1/17/2012 7:00 AM 0.05 1.2 M 1.0 M A few small snow pellets fell midday 16 Jan 2012. Trace precip. S- began 1600 MST, S1/2 1830-1915L, then quickly diminishing snowfall, ending by 2030 MST. Accumulation 1.2". Precip 0.05".
1/18/2012 7:00 AM 0.00 0.0 M 0.5 M About half exposed ground still covered by 0.5" of snow.
1/19/2012 7:00 AM 0.00 0.0 M T M Patchy snow remains only in well shaded areas.
1/20/2012 7:00 AM 0.00 0.0 M 0.0 M
1/21/2012 7:00 AM 0.00 0.0 M 0.0 M
1/22/2012 7:00 AM 0.00 0.0 M 0.0 M
1/23/2012 7:00 AM 0.00 0.0 M 0.0 M
1/24/2012 7:00 AM 0.00 0.0 M 0.0 M
1/25/2012 7:00 AM 0.02 0.1 M 0.0 M SW- began shortly after 0800 MST 24 Jan 2012, continued intermittently during the morning, and ended as S-- early afternoon. Precip 0.02". Maximum accumulation only 0.1". Snow melted during the afternoon.
1/26/2012 7:00 AM 0.00 0.0 M 0.0 M
1/27/2012 7:00 AM 0.00 0.0 M 0.0 M
1/28/2012 7:00 AM 0.04 0.5 M 0.5 M S-- began 0815 MST 27 Jan 2012, soon became S-. Accumulating snow ended before noon, with 0.5" on the ground, precip .04".
1/29/2012 7:00 AM 0.00 0.0 M 0.0 M
1/30/2012 7:00 AM 0.00 0.0 M 0.0 M
1/31/2012 7:00 AM 0.00 0.0 M 0.0 M
2/1/2012 7:00 AM 0.00 0.0 M 0.0 M
2/2/2012 7:00 AM 0.00 0.0 M 0.0 M
2/3/2012 7:15 AM 0.90 12.3 M 12.3 M S- began ~0715 MST 02 Feb 2012. Grass was becoming white by 2000 MST. S3/8-1/2 for the remainder of the night, with occasional S+1/4 2230 MST 02 Feb to 0130 MST 03 Feb. At 2215 MST 02 Feb, S3/8, 4.5" on grass, precip 0.23". At 0140 MST 03 Feb, S1/2, 10.0" on grass, precip +.40", giving a snowfall rate of about 2" per hour for the past three hours. Lighter snowfall after 0200 MST. At 0710 MST 03 Feb, S-3/4, 12.3" accumulation on grass, precip +.27" for a storm total so far of 0.90".
2/4/2012 7:00 AM 0.39 7.3 M 18.0 M S- falling at start of observing period, ended by 1000 MST 03 Feb 2012. Precip since 0700 MST .05". New accumulation 0.7". Depth on ground at 0930 MST 13.0", max so far. S- began again 1300 MST, became occasionally moderate mid-afternoon through the evening. At 2235 MST, 5.5" new snowfall since 1300 MST, total on ground 18.1", precip since 1300 MST .27". Maximum average depth around the property occurred at 0100 MST 04 Feb 2012: 18.5". Very light snow after 0100 MST. Snowfall rate too low for additional accumulation, and depth actually decreased. At 0700 MST 04 Feb 2012, S-- still falling, 18.0" on the ground, 1.1" new since 2235 MST 03 Feb, precip +.07", for a 24-h total of .39".
2/5/2012 7:00 AM T T M 13.5 M SW-- ended at 0900 MST 06 Feb 2012 with a trace additional precipitation since 0700 MST and a trace of accumulation.
2/6/2012 7:00 AM 0.00 0.0 M 12.0 M
2/7/2012 7:00 AM 0.10 2.8 M 13.0 M S- began 2130 MST 06 Feb 2012, continued all night, sometimes very light, through the observation time. At 0700 MST 07 Feb, 2.8" new accumulation, water content 0.10", total depth on the ground 13.0".
2/8/2012 7:00 AM 0.01 0.1 M 11.0 M S-- in progress at start of observing period. S--, occasionally S- until 1100 MST 07 Feb 2012. S-/SW- resumed ~1400 MST, ending 1730 MST. Daytime precip (since 0700 MST) .01", new accumulation 0.1".
2/9/2012 7:00 AM 0.00 0.0 M 9.5 M
2/10/2012 7:00 AM 0.00 0.0 M 7.0 M The 7.0" of snow remaining on the ground is crusty on top.
2/11/2012 7:00 AM 0.09 2.7 M 10.0 M S- began 2045 MST 10 Feb 2012 and continued most of the night. Frost was on the rain gauge at obs time, indicating at least a brief clearing sometime early 11 Feb. New accumulation 2.7", melted equivalent 0.09" (snow very fluffy). S-- in progress at obs time.
2/12/2012 7:00 AM T T M 8.0 M Very light snow in progress at start of observing period, continued, sometimes intermittantly and in the form of showers, until 1400 MST 11 Feb 2012. Trace precip, trace accumulation. 8.0" on the ground at obs time.
2/13/2012 7:00 AM 0.00 0.0 M 7.0 M
2/14/2012 7:00 AM 0.00 0.0 M 5.5 M
2/15/2012 7:00 AM 0.00 0.0 M 4.0 M 4.0" of very crusty snow on ground at 0700 MST 15 Feb 2012.
2/16/2012 7:00 AM T T M 4.0 M Tiny snow grains, hardly perceptible from indoors, 0800 to 1000 MST 15 Feb 2012. Trace precip, trace accumulation. At obs time (0700 MST 16 Feb), 4.0" snow still on the ground, so crusty that I could stand on it without sinking in.
2/17/2012 7:00 AM 0.00 0.0 M 3.5 M 3.5" of crusty snow remains.
2/18/2012 7:00 AM T T M 3.0 M SW- 1920 to 2145 MST 17 Feb 2012. Trace precip. Trace accumulation.
2/19/2012 7:00 AM 0.00 0.0 M 3.0 M 3.0" of crusty snow remains.
2/20/2012 7:00 AM T T M 3.0 M SW- very early morning, 20 Feb 2012, time known. Trace precip and trace new snow. 3.0" of crusty snow remains on the the ground.
2/21/2012 7:00 AM 0.00 0.0 M 2.0 M 2.0" of crusty snow remains, with more than 80% coverage in open areas. Patches of bare ground are expanding rapidly from under trees.
2/22/2012 7:00 AM 0.00 0.0 M 1.0 M 1.0" of wet, slushy snow remains in open grassy areas.
2/23/2012 7:00 AM 0.26 2.1 M 2.1 M Strong chinook wind, gusting 60-70 mph in my neighborhood midday and early evening 22 Feb 2012, quickly melted remaining snow cover all over town, even in well-shaded areas. Max temperature 58 deg F. Strong cold front from north arrived 0200 MST 23 Feb with north wind 18G30 mph. RW- began 0210 MST (.04" precip), changed to snow at 0225 MST 23 Feb, briefly heavy. Ground whitened within the first 10 min. Snow tapered off gradually, with accumulation ending by 0600 MST. A few flakes still in the air at obs time. 2.1" new accumulation with a water content of 0.22". Total precip 0.26".
2/24/2012 7:00 AM T 0.0 M 1.5 M Snow showers over mountains most of the day on 23 Feb 2012. Occasional very light snow showers here (just a few flakes or graupel pellets) from 0700 to 1300 MST 23 Feb. Cold air aloft. Trace precip, no accumulation.
2/25/2012 7:00 AM 0.00 0.0 M 0.5 M Just a half inch of snow remains in open, grassy areas.
2/26/2012 7:00 AM 0.00 0.0 M T M Continuous snow cover disappeared by midday 25 Feb 2012. Snow cover remains this morning (26 Feb 2012) only in well shaded areas.
2/27/2012 7:00 AM 0.00 0.0 M 0.0 M
2/28/2012 7:00 AM 0.00 0.0 M 0.0 M
2/29/2012 7:00 AM T 0.0 M 0.0 M Brief snow shower between 1400 and 1500 MST 28 Feb 2012. Trace precip. No accumulation.
3/1/2012 7:00 AM 0.00 0.0 M 0.0 M
3/2/2012 7:00 AM T 0.0 M 0.0 M SW-- ~1430 MST 01 Mar 2012, hardly enough to dampen pavement. A few flakes ~ 2130L. Trace precip both times and no accumulation.
3/3/2012 7:00 AM T 0.0 M 0.0 M Brief SW- between 1700 and 1800 MST 02 Mar 2012. Trace precip and no accumulation.
3/4/2012 7:00 AM 0.00 0.0 M 0.0 M
3/5/2012 7:00 AM 0.00 0.0 M 0.0 M
3/6/2012 7:00 AM 0.00 0.0 M 0.0 M
3/7/2012 7:00 AM T 0.0 M T M Light drizzle began ~0500 MST 07 March 2012, became light freezing drizzle ~0600 MST. A few tiny snow grains mixed in. Trace precip. Trace of ice on my redwood deck, which is raised.
3/8/2012 7:00 AM 0.01 0.0 M 0.0 M Very light freezing drizzle during the morning of 07 March 2012, mostly continuous, enough to keep pavement wet. Occasional drizzle, almost a mist, early afternoon. Precip 0.01".
3/9/2012 7:00 AM 0.00 0.0 M 0.0 M
3/10/2012 7:00 AM 0.00 0.0 M 0.0 M
3/11/2012 7:00 AM 0.00 0.0 M 0.0 M
3/12/2012 7:00 AM T 0.0 M 0.0 M Sprinkles of rain sometime between 0700 and 0900 MDT Sunday, 11 Mar 2012, dampened pavement. Trace precip.
3/13/2012 7:00 AM 0.00 0.0 M 0.0 M
3/14/2012 7:00 AM 0.00 0.0 M 0.0 M
3/15/2012 7:00 AM 0.00 0.0 M 0.0 M
3/16/2012 7:00 AM 0.00 0.0 M 0.0 M
3/17/2012 7:00 AM 0.00 0.0 M 0.0 M
3/18/2012 7:00 AM 0.00 0.0 M 0.0 M
3/19/2012 7:00 AM T 0.0 M 0.0 M Widespread suspended dust in the air, visibility as low as eight miles mid and late afternoon of 18 Mar 2012. Strong southerly winds, slowly veering to SW by 1700 MDT. Max gusts 40-45 mph. Sprinkles of rain 1750-1755 MDT left heavy dust residue. Only a few drops of rain fell (trace precip).
3/20/2012 7:00 AM 0.00 0.0 M 0.0 M
3/21/2012 7:00 AM 0.00 0.0 M 0.0 M
3/22/2012 7:00 AM 0.00 0.0 M 0.0 M
3/23/2012 7:00 AM 0.00 0.0 M 0.0 M
3/24/2012 7:00 AM 0.00 0.0 M 0.0 M
3/25/2012 7:00 AM 0.00 0.0 M 0.0 M
3/26/2012 7:00 AM 0.00 0.0 M 0.0 M
3/27/2012 7:00 AM 0.00 0.0 M 0.0 M
3/28/2012 7:00 AM 0.00 0.0 M 0.0 M
3/29/2012 7:00 AM 0.00 0.0 M 0.0 M
3/30/2012 7:00 AM 0.00 0.0 M 0.0 M
3/31/2012 7:00 AM 0.00 0.0 M 0.0 M
4/1/2012 7:00 AM 0.00 0.0 M 0.0 M
4/2/2012 7:00 AM 0.00 0.0 M 0.0 M
4/3/2012 7:00 AM 0.15 T M T M Light sprinkles began just after 0700 MDT 02 Apr 2012, continuing off and on throughout the day, never enough to wet the pavement. Trace precip. R- began 2145 MDT, continued through the night. R- changed to heavily rimed snow grains between 0615 and 0700 MDT 03 April. At 0700L, SG-, one mile visibility, trace accumulation, 24-h precip 0.15".
4/4/2012 7:00 AM 0.35 1.5 M 0.5 M Snow grains, visibility 1 mile, at start of observing period (0700 MDT 03 Apr 2012). Moderate snow (S3/8) 0745-0830 MDT with high water content (heavily rimed crystals and small pellets). S- after 0830 MDT, ending at 1100 MDT. SW- resumed 1330 MDT, continued until 1800 MDT. Precip since 0700 MDT 0.35". Max snow depth 1.5" ~1000 MDT. Falling snow partially melted at times during the afternoon. By 1800 MDT 0.5" of slushy snow remained on grass.
4/5/2012 7:00 AM 0.00 0.0 M 0.0 M
4/6/2012 7:00 AM 0.00 0.0 M 0.0 M
4/7/2012 7:00 AM 0.00 0.0 M 0.0 M
4/8/2012 7:00 AM 0.00 0.0 M 0.0 M
4/9/2012 7:00 AM 0.00 0.0 M 0.0 M
4/10/2012 7:00 AM 0.00 0.0 M 0.0 M
4/11/2012 7:00 AM 0.00 0.0 M 0.0 M
4/12/2012 7:00 AM 0.26 0.0 M 0.0 M A few small drops of rain ~1700 MDT 11 Apr 2012. Trace precip. TRW 2250-2305 MDT. Precip 0.26". South winds during storm, gusting to 40 mph. Not much lightning.
4/13/2012 7:00 AM T 0.0 M 0.0 M RW-- moved across the neighborhood during the noon hour on 12 April 2012. Trace precip.
4/14/2012 7:00 AM 0.00 0.0 M 0.0 M
4/15/2012 7:00 AM 0.56 T M T M RW--, a few small drops ~1700 MDT 14 April 2012 (trace), then brief RW- ~1900 MDT, this time enough to completely wet pavement (perhaps .01" precip). Steady R- began ~2000 MDT, occasionally moderate after 2200 MDT, changing to snow approximately 2400 MDT, then ending ~0100 MDT 15 April. Total precip 0.56". Trace of slush still on the ground at obs time, but measurable depth not observed at any time. Min temperature 33 deg F.
4/16/2012 7:00 AM 0.10 0.0 M 0.0 M Cold air aloft and moist air mass were the right conditions for convective showers, starting in late morning on 15 April 2012. Brief RW-- at 1700 MDT (trace), then brief RW--SPW-- with thunder ~1215 MDT (also a trace). Thunder began again at 1430 MDT, then TSPW-RW- for 6 minutes starting at 1445 MDT. More than 75% of the precip was ice. Graupel size mostly 1/4". Temperature dropped to 43 deg F during shower. Precip in gauge .05" but considerable graupel bounced out of funnel, which was attached to gauge. RW- 1805-1830 MDT. Precip +.05" for 24-h total of 0.10". I suppose I could have called the precip hail, but I called it large graupel. It whitened bare ground for a few minutes.
4/17/2012 7:00 AM 0.00 0.0 M 0.0 M
4/18/2012 7:00 AM 0.00 0.0 M 0.0 M
4/19/2012 7:00 AM 0.00 0.0 M 0.0 M
4/20/2012 7:00 AM 0.00 0.0 M 0.0 M
4/21/2012 7:00 AM 0.00 0.0 M 0.0 M
4/22/2012 7:00 AM 0.00 0.0 M 0.0 M
4/23/2012 7:00 AM 0.00 0.0 M 0.0 M
4/24/2012 7:00 AM 0.00 0.0 M 0.0 M
4/25/2012 7:00 AM 0.00 0.0 M 0.0 M
4/26/2012 7:00 AM 0.00 0.0 M 0.0 M
4/27/2012 7:00 AM 0.02 0.0 M 0.0 M Sprinkles began 2140 MDT 26 April 2012, accompanied by gusty SW winds. RW- 2150-2230 MDT. Precip .02".
4/28/2012 7:00 AM T 0.0 M 0.0 M Light sprinkes between 0700 and 0800 MDT on 27 Apr 2012. Trace precip.
4/29/2012 7:00 AM 0.00 0.0 M 0.0 M
4/30/2012 7:00 AM 0.00 0.0 M 0.0 M
5/1/2012 7:00 AM 0.00 0.0 M 0.0 M
5/2/2012 7:00 AM 0.00 0.0 M 0.0 M
5/3/2012 7:00 AM 0.00 0.0 M 0.0 M
5/4/2012 7:00 AM 0.00 0.0 M 0.0 M
5/5/2012 7:00 AM 0.00 0.0 M 0.0 M
5/6/2012 7:00 AM 0.00 0.0 M 0.0 M
5/7/2012 7:00 AM 0.50 0.0 M 0.0 M Rain showers began ~1800 MDT 06 May 2012, changed to steady rain and continued until ~2200 MDT. Estimated precip .35". Rain resumed ~0330 MDT 07 May 2012. Total precip since 1800 MDT 06 May .50" at 0700 MDT.
5/8/2012 7:00 AM 0.38 0.0 M 0.0 M Rain in progress at beginning of observation period (0700 MDT 07 May 2012). Rain ended about noon. Precip since 0700 MDT .38"
5/9/2012 7:00 AM 0.00 0.0 M 0.0 M
5/10/2012 7:00 AM 0.00 0.0 M 0.0 M
5/11/2012 7:00 AM 0.00 0.0 M 0.0 M
5/12/2012 7:00 AM 0.18 0.0 M 0.0 M RW- 1200-1400 MDT 11 May 2012. Precip .08". Intermittent RW- 1730-2300 MDT. Precip .10". 24-hour precip .18".
5/13/2012 7:00 AM 0.07 0.0 M 0.0 M RW- 1800-1915 MDT 12 May 2012. Precip .07". Occasional light drizzle predawn on 13 May (trace).
5/14/2012 7:00 AM 0.00 0.0 M 0.0 M
5/15/2012 7:00 AM 0.00 0.0 M 0.0 M
5/16/2012 7:00 AM 0.00 0.0 M 0.0 M
5/17/2012 7:00 AM 0.00 0.0 M 0.0 M
5/18/2012 7:00 AM 0.02 0.0 M 0.0 M Several peals of thunder between noon and 1215 MDT, 17 May 2012. RW- 1220-1235 MDT. Precip .02".
5/19/2012 7:00 AM T 0.0 M 0.0 M Gusty winds and a few sprinkles from high-based showers around dinnertime.
5/20/2012 7:00 AM 0.14 0.0 M 0.0 M R-1100-1230 MDT 19 May 2012 (precip .04"). RW-1345-1700 MDT (precip +.10") for a daily total of 0.14".
5/21/2012 7:00 AM T 0.0 M 0.0 M A few light sprinkles early evening. Trace precip.
5/22/2012 7:00 AM 0.00 0.0 M 0.0 M
5/23/2012 7:00 AM 0.00 0.0 M 0.0 M
5/24/2012 7:00 AM 0.45 0.0 M 0.0 M Rain from 1500-2100 MDT, 23 May 2012. Precip 0.45".
5/25/2012 7:00 AM 0.00 0.0 M 0.0 M
5/26/2012 7:00 AM 0.00 0.0 M 0.0 M
5/27/2012 7:00 AM 0.00 0.0 M 0.0 M
5/28/2012 7:00 AM 0.00 0.0 M 0.0 M
5/29/2012 7:00 AM 0.00 0.0 M 0.0 M
5/30/2012 7:00 AM 0.00 0.0 M 0.0 M
5/31/2012 7:00 AM 0.00 0.0 M 0.0 M
6/1/2012 7:00 AM 0.00 0.0 M 0.0 M
6/2/2012 7:00 AM T 0.0 M 0.0 M Light thundershowers in the area late afternoon / early evening. Only a few sprinkles here. Trace precip.
6/3/2012 7:00 AM T 0.0 M 0.0 M Light thundershowers in the area late afternoon / early evening. Only rain sprinkles here. Trace precip.
6/4/2012 7:00 AM T 0.0 M 0.0 M Light thundershowers in the vicinity late afternoon. Only a few drops of rain here. Trace precip.
6/5/2012 7:00 AM 0.00 0.0 M 0.0 M
6/6/2012 7:00 AM 0.00 0.0 M 0.0 M
6/7/2012 7:00 AM 0.09 0.0 M 0.0 M Brief RW-- 1705 and 1725 MDT 06 June 1012. Trace precip. TRW- 1925-1935 MDT. Precip 0.08". TRW- ~2030 MDT. Precip (+.01) for daily total of 0.09".
6/8/2012 7:00 AM 0.01 0.0 M 0.0 M RW- 1130-1140 MDT 07 June 2012. Precip .01".
6/9/2012 7:00 AM 0.00 0.0 M 0.0 M
6/10/2012 7:00 AM 0.00 0.0 M 0.0 M
6/11/2012 7:00 AM 0.00 0.0 M 0.0 M
6/12/2012 7:00 AM 0.00 0.0 M 0.0 M
6/13/2012 7:00 AM 0.00 0.0 M 0.0 M
6/14/2012 7:00 AM 0.00 0.0 M 0.0 M
6/15/2012 7:00 AM 0.02 0.0 M 0.0 M RW- 1900-1930 MDT 14 June 2012. Precip .02". Brief RW-- ~2030 MDT. Trace precip.
6/16/2012 7:00 AM T 0.0 M 0.0 M TRW-- 1200-1215 MDT 15 Jun 2012. Trace precip.
6/17/2012 7:00 AM T 0.0 M 0.0 M RW--, just a few drops, 1510-1520 MDT 16 Jun 2012. Trace precip.
6/18/2012 7:00 AM 0.00 0.0 M 0.0 M
6/19/2012 7:00 AM 0.00 0.0 M 0.0 M
6/20/2012 7:00 AM 0.00 0.0 M 0.0 M
6/21/2012 7:00 AM 0.00 0.0 M 0.0 M
6/22/2012 7:00 AM 0.00 0.0 M 0.0 M
6/23/2012 7:00 AM 0.00 0.0 M 0.0 M
6/24/2012 7:00 AM 0.00 0.0 M 0.0 M
6/25/2012 7:00 AM 0.02 0.0 M 0.0 M Brief TRW- between 1920 and 1930 MDT 24 June 2012. Precip .02". Downburst winds up to 40 mph immediately preceded the rain.
6/26/2012 7:00 AM 0.00 0.0 M 0.0 M Temperature in my back yard (standard mercury-in-glass maximum thermometer on whirling pedestal in a ventilated shelter) reached 102.7 deg F (call it 103) mid or late afternoon 25 June 2012. This is the highest temperature recorded since I began keeping records in Boulder in 1971.
6/27/2012 7:00 AM 0.02 0.0 M 0.0 M TRW- 1315-1340 MDT, 26 Jun 2012. Precip .02". TRW-- 1900-1945 MDT (intermittent drops of rain). Trace precip.
6/28/2012 7:00 AM 0.07 0.0 M 0.0 M A few drops of rain 1200-1230 MDT, 27 Jun 2012. No thunder. Trace precip. TRW- 1500-1600 MDT. Precip .07".
6/29/2012 7:00 AM 0.09 0.0 M 0.0 M TRW- 1300-1330 MDT 28 Jun 2012. Precip .09".
6/30/2012 7:00 AM 0.03 0.0 M 0.0 M TRW- 18-19 MDT 29 Jun 2012. Precip .03
7/1/2012 7:00 AM 0.00 0.0 M 0.0 M
7/2/2012 7:00 AM 0.00 0.0 M 0.0 M
7/3/2012 7:00 AM 0.08 M M M M TRW- 1930-2030 MDT 02 July 2012. Precip .08".
7/4/2012 7:00 AM 0.00 0.0 M M M
7/5/2012 7:00 AM 0.00 0.0 M M M
7/6/2012 7:00 AM 0.24 M M M M TRW-- ~1550 MDT, 05 July 2012, big drops, trace precip. TRW 1635-1655 MDT, precip 0.24".
7/7/2012 7:00 AM 0.40 M M M M RW-1432-1437 MDT 06 Jul 2012, precip .02. RW-, nearly continuous, 1630-1820 MDT, precip +.09. TRW-/RW- 2100-2200 MDT, then RW- 0145-0245 MDT 07 Jul 2012. Precip +.29 from both events combined. 24-h total precip 0.40".
7/8/2012 7:00 AM 1.72 M M M M TRW+ 1715-1800 MDT 07 Jul 2012, then rainfall intensity tapering off gradually in RW- and finally R-, ending between 2300 and 2330 MDT. Precip 1.42" up until 2115 MDT, then an additional +.30" before precip ended. Occasional drizzle the rest of the night (trace). 24-h total precip 1.72".
7/9/2012 7:00 AM 0.67 M M M M Brief RW--, small drops, ~1700 MDT 08 Jul 2012 (trace precip). TRW 1850-1915 MDT, tapering off to RW-, then ending at 2010 MDT. Precip 0.54". RW- 0145-0300 MDT 09 Jul 2012. Precip +.13. 24-hour total precip 0.67".
7/10/2012 7:00 AM 0.20 M M M M RW 1000-1100 MDT 09 July 2012. Precip .20".
7/11/2012 7:00 AM 0.00 0.0 M M M
7/12/2012 7:00 AM 0.00 0.0 M M M
7/13/2012 7:00 AM 0.03 M M M M TRW- 1630-1645 MDT 12 Jul 2012, precip 0.03".
7/14/2012 7:00 AM 0.00 0.0 M M M
7/15/2012 7:00 AM 0.00 0.0 M M M
7/16/2012 7:00 AM T M M M M Trace of rain in late afternoon or evening, time unknown.
7/17/2012 7:00 AM 0.61 M M M M TRW 1610-1700 MDT 16 July 2012. Precip .55". RW- 1720-1845 MDT. Precip +.06. 24-h total 0.61".
7/18/2012 7:00 AM 0.00 0.0 M M M
7/19/2012 7:00 AM 0.00 0.0 M M M
7/20/2012 7:00 AM 0.00 0.0 M M M
7/21/2012 7:00 AM 0.00 0.0 M M M
7/22/2012 7:00 AM 0.00 0.0 M M M
7/23/2012 7:00 AM 0.04 M M M M RW-- with no thunder during the afternoon of 22 Jul 2012. Trace precip. 0.04" precip in showers very early on 23 July 2012, time unknown.
7/24/2012 7:00 AM 0.07 M M M M TRW- at 1845 MDT 23 Jul 2012, then RW- at 1915 MDT. Precip .07".
7/25/2012 7:00 AM 0.08 M M M M TRW- with wind and considerable lightning ~2200 MDT 24 Jul 2012. Precip .08".
7/26/2012 7:00 AM 0.01 M M M M RW-- ~1300 MDT 25 July 2012, trace precip. RW- at 1550 MDT, precip 0.01".
7/27/2012 7:00 AM 0.00 0.0 M M M
7/28/2012 7:00 AM T M M M M Trace of rain during the afternoon of 27 July 2012, time unknown.
7/29/2012 7:00 AM T M M M M Rain sprinkles ~ 1700 MDT 28 July 2012. Trace precip.
7/30/2012 7:00 AM 0.12 M M M M RW- ~ 1400 MDT and again at 1600 MDT 29 July 2012. Precip 0.12".
7/31/2012 7:00 AM 0.21 M M M M Occasional RW- from 1400 to 1700 MDT 30 Jul 2012. Precip 0.21".
8/1/2012 7:00 AM 0.00 0.0 M M M
8/2/2012 7:00 AM 0.05 M M M M RW-- with medium-size drops ~1250 MDT 01 Aug 2012. Trace precip. TRW- 1705-1740 MDT, precip 0.05".
8/3/2012 7:00 AM 0.01 M M M M TRW- 1650-1710 MDT 02 Aug 2012. Precip 0.01". Gusty outflow winds, variable in direction.
8/4/2012 7:00 AM 0.00 0.0 M M M
8/5/2012 7:00 AM 0.00 0.0 M M M
8/6/2012 7:00 AM 0.00 0.0 M M M
8/7/2012 7:00 AM 0.00 0.0 M M M
8/8/2012 7:00 AM 0.00 0.0 M M M
8/9/2012 7:00 AM 0.00 0.0 M M M
8/10/2012 7:00 AM 0.00 0.0 M M M
8/11/2012 7:00 AM T M M M M Rain sprinkles ~2230 MDT 10 Aug 2012, enough to dampen the pavement. Trace precip.
8/12/2012 7:00 AM 0.13 M M M M A few drops of rain late morning 11 Aug 2012 (trace precip). RW- 1830 MDT, becoming TRW- at 1850 MDT 11 Aug, ending ~1910 MDT. Precip 0.12". RW- either very late on 11 Aug or very early 12 Aug (+.01").
8/13/2012 7:00 AM 0.00 0.0 M M M
8/14/2012 7:00 AM 0.00 0.0 M M M
8/15/2012 7:00 AM 0.00 0.0 M M M
8/16/2012 7:00 AM T M M M M Few drops of rain 1635 MDT 15 Aug 2012 (trace). RW-- 1715-1730 MDT associated with passage of (mostly) dry cool front. Trace precip.
8/17/2012 7:00 AM T M M M M RW-- late afternoon 16 Aug 2012. Trace precip. Don't know if thunder was heard. I was not at home.
8/18/2012 7:00 AM 0.00 0.0 M M M
8/19/2012 7:00 AM 0.00 0.0 M M M
8/20/2012 7:00 AM 0.00 0.0 M M M
8/21/2012 7:00 AM 0.00 0.0 M M M
8/22/2012 7:00 AM 0.00 0.0 M M M
8/23/2012 7:00 AM 0.03 M M M M RW- between 0030 and 0130 MDT 23 Aug 2012. Precip .03".
8/24/2012 7:00 AM 0.00 0.0 M M M
8/25/2012 7:00 AM 0.00 0.0 M M M
8/26/2012 7:00 AM 0.00 0.0 M M M
8/27/2012 7:00 AM 0.00 0.0 M M M
8/28/2012 7:00 AM 0.00 0.0 M M M
8/29/2012 7:00 AM 0.00 0.0 M M M
8/30/2012 7:00 AM 0.00 0.0 M M M
8/31/2012 7:00 AM 0.00 0.0 M M M
9/1/2012 7:00 AM 0.00 0.0 M 0.0 M
9/2/2012 7:00 AM 0.03 0.0 M 0.0 M RW- 1230-1239 MDT 01 Sep 2012. Precip .01". TRW- 1357-1500 MDT. Only intermittent very light sprinkles after the first few minutes. Precip +.02' for a 24-h total of .03".
9/3/2012 7:00 AM 0.02 0.0 M 0.0 M TRW- 1625-1645 MDT. Precip .02".
9/4/2012 7:00 AM 0.00 0.0 M 0.0 M
9/5/2012 7:00 AM 0.00 0.0 M 0.0 M
9/6/2012 7:00 AM 0.00 0.0 M 0.0 M
9/7/2012 7:00 AM 0.04 0.0 M 0.0 M RW- 0220-0350 MDT 07 Sep 2012. Precip .04".
9/8/2012 7:00 AM 0.08 0.0 M 0.0 M RW- 1245-1300 MDT and 1445-1530 MDT 07 Sep 2012. Precip 0.08".
9/9/2012 7:00 AM 0.01 0.0 M 0.0 M Brief RW- between 0400 and 0500 MDT 09 Sep 2012. Precip. 0.01"
9/10/2012 7:00 AM 0.00 0.0 M 0.0 M
9/11/2012 7:00 AM 0.00 0.0 M 0.0 M
9/12/2012 7:00 AM 0.78 0.0 M 0.0 M RW- 1930-2115 MDT 11 Sep 2012. RW-/R- resumed ~0100 MDT 12 Sep. R, bordering on R+, 0350-0415 MDT and again starting at 0610 MDT, still in progress at observation time.
9/13/2012 7:00 AM 0.47 0.0 M 0.0 M Moderate rain in progress at start of observing period. This tapered off to light rain by 0900 MDT 12 Sep 2012, by which time 0.31" had fallen. R- decreased late morning, becoming drizzle and ending by 1300 MDT. Precip +.14". RW- late evening 12 Sep (+.02"), time unknown. 24-h total 0.47".
9/14/2012 7:00 AM 0.00 0.0 M 0.0 M
9/15/2012 7:00 AM 0.00 0.0 M 0.0 M
9/16/2012 7:00 AM 0.00 0.0 M 0.0 M
9/17/2012 7:00 AM 0.00 0.0 M 0.0 M
9/18/2012 7:00 AM 0.00 0.0 M 0.0 M
9/19/2012 7:00 AM 0.00 0.0 M 0.0 M
9/20/2012 7:00 AM 0.00 0.0 M 0.0 M
9/21/2012 7:00 AM 0.00 0.0 M 0.0 M
9/22/2012 7:00 AM 0.00 0.0 M 0.0 M
9/23/2012 7:00 AM 0.00 0.0 M 0.0 M
9/24/2012 7:00 AM 0.00 0.0 M 0.0 M
9/25/2012 7:00 AM 0.00 0.0 M 0.0 M
9/26/2012 7:00 AM 0.43 0.0 M 0.0 M RW-- began 1515 MDT 25 Sep 2012, became RW- 1545-1615 MDT, then ended. Precip .03". RW- began again 1920 MDT, continued until about midnight. .07 additional rainfall by 2240 MDT 25 Sep. Measurable precip possible early 26 Sep 05-06 MDT but amount unknown. 24-h total in gauge at 0700 MDT 0.43".
9/27/2012 7:00 AM 0.40 0.0 M 0.0 M TRW 1425-1435 MDT 26 Sep 2102, then rapidly diminishing rain. Precip 0.27". TRW- 2135-2150 MDT. Precip +.12". 0.01" rain fell after 2230 MDT, time unknown. 24-h total 0.40".
9/28/2012 7:00 AM 0.04 0.0 M 0.0 M RW- 1545-1645 MDT 27 Sep 2012. Precip 0.04".
9/29/2012 7:00 AM 0.00 0.0 M 0.0 M
9/30/2012 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