Station Overview Station Location
Station Number CO-BO-67 Latitude 39.999614
Station Name Boulder 4.7 E Longitude -105.179377
County Boulder Elevation (ft) 5325



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 1.31 0.46 21 0.46 21 0.00 0 0 5 3 0.0 0 0
Nov 10 1.00 0.33 17 0.33 17 0.00 0 0 2 3 1.7 3 3
Dec 10 0.70 0.38 21 0.38 21 0.00 0 0 3 2 7.1 3 2
Jan 11 0.57 0.78 19 0.78 19 0.00 0 0 3 2 11.2 3 15
Feb 11 0.54 0.97 22 0.97 22 0.00 0 0 7 2 12.6 8 15
March 11 1.80 0.36 24 0.36 24 0.00 0 0 5 3 1.5 3 1
April 11 2.13 2.04 25 2.04 25 0.00 0 0 11 2 3.3 4 1
May 11 2.38 1.99 16 1.99 16 0.00 0 0 6 4 0.0 0 0
June 11 1.84 1.14 29 1.14 29 0.00 0 0 6 2 0.0 0 0
July 11 1.68 3.73 31 3.73 31 0.00 0 0 18 2 0.0 0 0
Aug 11 1.64 0.39 30 0.39 30 0.00 0 0 5 10 0.0 0 0
Sept 11 1.40 1.79 30 1.79 30 0.00 0 0 7 4 0.0 0 0
Water Year Totals: 16.99" 14.36" 285 days 14.36" 285 0.00" 0 days 0 78 days 39 days 37.4" 24 days 37 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
10/4/2010
10/5/2010 0.00
10/6/2010 T
10/7/2010 0.28
10/8/2010 0.01
10/9/2010 0.00
10/10/2010 0.00
10/11/2010 0.11
10/12/2010
10/13/2010
10/14/2010
10/15/2010
10/16/2010
10/17/2010 0.00
10/18/2010 0.00
10/19/2010 0.04
10/20/2010
10/21/2010
10/22/2010 0.00
10/23/2010 0.02
10/24/2010 T
10/25/2010 0.00
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
11/1/2010
11/2/2010
11/3/2010
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 0.20
11/11/2010 0.13
11/12/2010 T
11/13/2010
11/14/2010
11/15/2010
11/16/2010
11/17/2010
11/18/2010
11/19/2010
11/20/2010
11/21/2010
11/22/2010
11/23/2010 0.00
11/24/2010 0.00
11/25/2010 0.00
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
12/2/2010
12/3/2010 0.00
12/4/2010 0.00
12/5/2010 0.00
12/6/2010
12/7/2010 0.00
12/8/2010 0.00
12/9/2010
12/10/2010 0.00
12/11/2010 T
12/12/2010
12/13/2010 0.00
12/14/2010 0.00
12/15/2010 0.00
12/16/2010 0.02
12/17/2010 0.01
12/18/2010 T
12/19/2010
12/20/2010 0.00
12/21/2010 0.00
12/22/2010 0.00
12/23/2010 0.00
12/24/2010
12/25/2010
12/26/2010
12/27/2010 0.00
12/28/2010 0.00
12/29/2010
12/30/2010 0.00
12/31/2010 0.35
Day of YearDaily PrcpMultiday Prcp
1/1/2011 T
1/2/2011 0.00
1/3/2011 0.00
1/4/2011
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 0.54
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
1/17/2011 0.00
1/18/2011 0.00
1/19/2011 0.00
1/20/2011 0.23
1/21/2011
1/22/2011
1/23/2011
1/24/2011
1/25/2011
1/26/2011
1/27/2011
1/28/2011
1/29/2011
1/30/2011
1/31/2011 T
2/1/2011 0.11
2/2/2011 T
2/3/2011 0.00
2/4/2011 0.04
2/5/2011
2/6/2011 0.45
2/7/2011 0.00
2/8/2011 0.27
2/9/2011 0.06
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
2/16/2011 0.00
2/17/2011 0.00
2/18/2011 0.00
2/19/2011
2/20/2011
2/21/2011
2/22/2011
2/23/2011 0.00
2/24/2011 0.00
2/25/2011 0.02
2/26/2011 0.02
2/27/2011 0.00
2/28/2011 T
3/1/2011 0.00
3/2/2011
3/3/2011 0.00
3/4/2011 T
3/5/2011 0.00
3/6/2011 0.00
3/7/2011 0.02
3/8/2011 0.01
3/9/2011 T
3/10/2011 0.00
3/11/2011 0.00
3/12/2011 0.00
3/13/2011 0.09
3/14/2011
3/15/2011 0.00
3/16/2011 0.00
3/17/2011 0.00
3/18/2011 0.05
3/19/2011
3/20/2011 0.00
3/21/2011 0.00
3/22/2011 0.00
3/23/2011
3/24/2011
3/25/2011 0.00
3/26/2011
3/27/2011
3/28/2011 T
3/29/2011 0.19
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 0.18
4/5/2011 0.00
4/6/2011 0.00
4/7/2011 0.01
4/8/2011 0.00
4/9/2011 0.00
4/10/2011 0.14
4/11/2011
4/12/2011
4/13/2011 0.00
4/14/2011 1.00
4/15/2011
4/16/2011
4/17/2011
4/18/2011 0.00
4/19/2011 0.18
4/20/2011 0.00
4/21/2011 0.15
4/22/2011 0.03
4/23/2011 T
4/24/2011 0.03
4/25/2011 0.26
4/26/2011 0.01
4/27/2011 0.05
4/28/2011 0.00
4/29/2011 0.00
4/30/2011 T
5/1/2011 T
5/2/2011 0.00
5/3/2011 T
5/4/2011 0.00
5/5/2011 0.00
5/6/2011
5/7/2011
5/8/2011
5/9/2011
5/10/2011 0.00
5/11/2011 0.68
5/12/2011 0.89
5/13/2011 0.14
5/14/2011
5/15/2011 0.24
5/16/2011 0.03
5/17/2011
5/18/2011
5/19/2011
5/20/2011
5/21/2011
5/22/2011
5/23/2011
5/24/2011
5/25/2011
5/26/2011 0.00
5/27/2011 0.00
5/28/2011
5/29/2011 0.01
5/30/2011 T
5/31/2011 T
6/1/2011
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 0.18
6/10/2011 0.01
6/11/2011 0.00
6/12/2011 0.00
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 T
6/19/2011 T
6/20/2011 0.89
6/21/2011 0.01
6/22/2011 0.00
6/23/2011 0.00
6/24/2011 0.04
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 0.01
Day of YearDaily PrcpMultiday Prcp
7/1/2011 0.11
7/2/2011 0.09
7/3/2011 0.00
7/4/2011 T
7/5/2011 0.00
7/6/2011 0.01
7/7/2011 0.05
7/8/2011 1.09
7/9/2011 T
7/10/2011 0.61
7/11/2011 0.81
7/12/2011 0.58
7/13/2011 0.14
7/14/2011 0.04
7/15/2011 0.07
7/16/2011 0.01
7/17/2011 0.01
7/18/2011 0.00
7/19/2011 0.00
7/20/2011 0.02
7/21/2011 0.02
7/22/2011 0.00
7/23/2011 0.00
7/24/2011 0.00
7/25/2011 0.00
7/26/2011 0.00
7/27/2011 0.02
7/28/2011 0.04
7/29/2011 0.00
7/30/2011 0.01
7/31/2011 0.00
8/1/2011 T
8/2/2011 T
8/3/2011 0.05
8/4/2011 0.00
8/5/2011 T
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 0.00
8/13/2011 0.00
8/14/2011 0.00
8/15/2011 0.04
8/16/2011
8/17/2011 0.17
8/18/2011 T
8/19/2011 0.00
8/20/2011 0.11
8/21/2011 T
8/22/2011 0.00
8/23/2011 T
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 0.02
8/30/2011 0.00
8/31/2011 T
9/1/2011 0.00
9/2/2011 T
9/3/2011 T
9/4/2011 0.00
9/5/2011 0.00
9/6/2011 0.00
9/7/2011 0.07
9/8/2011 0.68
9/9/2011 0.00
9/10/2011 0.00
9/11/2011 0.00
9/12/2011 0.00
9/13/2011 0.02
9/14/2011 0.02
9/15/2011 0.94
9/16/2011 0.01
9/17/2011 0.00
9/18/2011 T
9/19/2011 0.00
9/20/2011 0.00
9/21/2011 T
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
10/5/2010 7:00 AM 0.00 0.0 M 0.0 M may have been a few afternoon sprinkles but not there to see them
10/6/2010 7:00 AM T 0.0 M 0.0 M some sprinkles around 1030pm
10/7/2010 7:00 AM 0.28 0.0 M 0.0 M actual rain! A sudden onset of R+ just past midnight at ~1215, sounded like hail but saw only huge drops. After 2-5min had some close lightning. Over in < 30 min.
10/8/2010 7:00 AM 0.01 0.0 M 0.0 M some light rain showers ~5-7am
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 A light shower this morning but pretty sure it came after 0700.
10/11/2010 7:00 AM 0.11 0.0 M 0.0 M off and R- to R-- all day, with some "heavier periods" after 6pm until things ended after midnight. 0.02 0700-1200, another T by1700, another 0.05" by 2200, 0.04" after that.
10/17/2010 7:00 AM 0.00 0.0 M 0.0 M light frost on the roof; low of 35
10/18/2010 7:00 AM 0.00 0.0 M 0.0 M
10/19/2010 7:00 AM 0.04 0.0 M 0.0 M low of 33 with frost on the roof and porch. Off and on R- much of afternoon, over by ~9pm
10/22/2010 7:00 AM 0.00 0.0 M 0.0 M
10/23/2010 7:00 AM 0.02 0.0 M 0.0 M off and on light rain showers most of the day, starting after 10am, think all the rain was over by 9pm.
10/24/2010 7:00 AM T 0.0 M 0.0 M a few sprinkles around 1130 am
10/25/2010 7:00 AM 0.00 0.0 M 0.0 M
10/26/2010 7:00 AM T 0.0 M 0.0 M A few sprinkles around 830am, great double rainbow at ~0800. Did see some light snow flurries at the NOAA building just before 6 pm.
10/27/2010 7:00 AM 0.00 0.0 M 0.0 M low of 33, still no temp below 32!
10/28/2010 7:00 AM 0.00 0.0 M 0.0 M First night dipping below 32, and what a dip, all the way down to 20. Only 21 at 0830.
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
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 brief shower around 130pm then cleared off nicely.
11/9/2010 7:00 AM 0.00 0.0 M 0.0 M
11/10/2010 7:00 AM 0.20 0.3 M 0.5 M Precip began around noon, totally over by 6pm
11/11/2010 7:00 AM 0.13 1.3 M 1.5 M SW- began about 8pm, only a light dusting by 11pm but ~0.5" by 230AM. Back to SW- by 7am.
11/12/2010 7:00 AM T T M 0.5 M Low of 17. Off and on flurries much of the day, ended by about 10pm.
11/23/2010 7:00 AM 0.00 0.0 M T M 0.2" of snow in the shade, a bit in the sun.
11/24/2010 7:00 AM 0.00 0.0 M T M still 0.1" of snow in the shade
11/25/2010 7:00 AM 0.00 0.0 M T M saw a few snow flurries around 1pm in town but no evidence of anything here. Low of 13.
11/26/2010 7:00 AM 0.00 0.0 M T M A little bit of snow left in the shade.
11/27/2010 7:00 AM 0.00 0.0 M 0.0 M just a tiny bit of snow left in the shade, hardly any at this point.
11/28/2010 7:00 AM 0.00 0.0 M 0.0 M
11/29/2010 7:00 AM T 0.1 M T M some snow showers in the afternoon (T), then a short period of S- ~810-830pm
11/30/2010 7:00 AM 0.00 0.0 M 0.0 M low of 12
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
12/7/2010 7:00 AM 0.00 0.0 M 0.0 M
12/8/2010 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 T 0.0 M 0.0 M Off and on R- from about 445pm through 7pm or so, wet the ground but nothing in the bucket.
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 0.02 0.0 M 0.0 M Rain showers in the mid to late afternoon. Not sure if it mixed with snow before ending < 5pm
12/17/2010 7:00 AM 0.01 0.5 M 0.5 M Real fluff with barely 0.01". snow flurries began ~800pm but barely a dusting by midnight. S- and 22 at 0700.
12/18/2010 7:00 AM T 0.2 M T M S- much of the day, may have been more but only 0.2 new of fluff could be measured.
12/20/2010 7:00 AM 0.00 0.0 M 0.0 M May have been a little R- before 0700 but didn't see it.
12/21/2010 7:00 AM 0.00 0.0 M 0.0 M
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 Thick frost, i guess that is sorta white!
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
12/30/2010 7:00 AM 0.00 0.0 M 0.0 M flurries just beginning at 0720 and 30 degrees.
12/31/2010 7:00 AM 0.35 6.4 M 6.0 M S-- began at 0720, increased by 0830, then snow through most of the day and night with harder periods. Some totals: by 1700 4.1/0.20", by 2230LT another 1.5/0.07", then another 0.9/0.08" 0700 Low +3, 4 at 0800 with SW-
1/1/2011 7:00 AM T T M 4.5 M Snow flurries early ended by ~0900. Hi of only 13, low of -1 by about 7pm but rose overnight.
1/2/2011 7:00 AM 0.00 0.0 M 4.0 M Low of -1 but then temp rose >midnight
1/3/2011 7:00 AM 0.00 0.0 M 3.0 M
1/5/2011 7:00 AM 0.00 0.0 M 3.0 M
1/6/2011 7:00 AM 0.00 0.0 M 2.5 M
1/7/2011 7:00 AM 0.00 0.0 M 1.0 M Snow cover took a big hit with wind and 54 high temp. Bare spots showing up, more like 0.5 sunny areas and 2" shady areas
1/8/2011 7:00 AM 0.00 0.0 M 0.5 M Trace left in full sun areas to large areas of 1-2" elsewhere
1/9/2011 7:00 AM 0.01 0.1 M 0.5 M very dense snow right now
1/10/2011 7:00 AM 0.54 7.3 M 6.0 M Interesting snowfall distribution during the day and night. Here are some amounts: 0700-1200 2.0", then another 0.2" by ~1400 before snow ended and sun came out, 0.16" melted with the 2.2 by 1700 when snow started up again. Snow was moderate to heavy at times in the evening with 2.5" of fluff (0.07") by 2130, then another 2.5" overnight that was much more dense (0.20") with a low of -1 at 0700 and mostly clear skies. Snow seemed to mostly be over (just flurries) by ~0230.
1/11/2011 7:00 AM 0.00 0.0 M 4.5 M Lots of settling despite high of only 15, 7" in the shade. Low of -3, twice! (once < 8pm, then near sunrise)
1/12/2011 7:00 AM 0.00 0.0 M 4.0 M low of -5, about 6" in the shade
1/13/2011 7:00 AM 0.00 0.0 M 3.5 M more like 6" in the shade. Hi of only 23 during the day, but 24 at midnight and warmed more after that.
1/14/2011 7:00 AM 0.00 0.0 M 2.0 M A warm up big time with a high of 51, but still 4-5" in the shade.
1/15/2011 7:00 AM 0.00 0.0 M 1.0 M Still a lot more of a solid snow cover in the shade, 4.5" on avearage
1/17/2011 7:00 AM 0.00 0.0 M T M very little left in the sun, but 2-3" of snow in the shade.
1/18/2011 7:00 AM 0.00 0.0 M T M Mostly bare ground in the sun, about 2" in the shade
1/19/2011 7:00 AM 0.00 0.0 M T M no snow in the sun, about 2" in the shade.
1/20/2011 7:00 AM 0.23 3.8 M 3.0 M Burst of quite heavy snow, began 145pm in town, down to flurries at my house by 8pm, but probably much earlier. VERY bad roads.
1/31/2011 7:00 AM T T M T M A light coating of ice from freezing drizzle.
2/1/2011 7:00 AM 0.11 1.9 M 1.5 M low of -11. Snow all day into the night: 1.5/0.08" by 7pm, another 0.2/0.01 by 10pm, then 0.2/0.02 by 7am.
2/2/2011 7:00 AM T 0.1 M 1.5 M burst of S- late afternoon. Overnight low of -18
2/3/2011 7:00 AM 0.00 0.0 M 1.5 M low of -8
2/4/2011 7:00 AM 0.04 0.5 M 1.5 M snow off and on in the afternoon. Pretty much melted where exposed to the sun but 0.5" new measured in the shady areas
2/6/2011 7:00 AM 0.45 5.7 M 5.5 M 4.5" after 11pm last night with 0.34" melted. Before that snow showers began at noon, 0.8/0.08" by 7pm, then S- till about 8pm (maybe another 0.2) but heavy snow began just before 11pm, at 11pm another 0.4/0.03.
2/7/2011 7:00 AM 0.00 0.0 M 4.5 M
2/8/2011 7:00 AM 0.27 3.2 M 7.0 M snow began about 910pm, S-, but by 920 S to S+ with strong NNE winds and blizzard conditions for about an hour or two, then winds subsided and mainly S-. Tricky to measure first inch or so.
2/9/2011 7:00 AM 0.06 0.6 M 6.0 M off and on S- until about 9pm, most fell before 2pm. Low of -11, high of only 8
2/10/2011 7:00 AM 0.00 0.0 M 5.5 M low of -3
2/11/2011 7:00 AM 0.00 0.0 M 5.5 M
2/12/2011 7:00 AM 0.00 0.0 M 5.0 M
2/13/2011 7:00 AM 0.00 0.0 M 4.0 M low of only 35
2/14/2011 7:00 AM 0.00 0.0 M 1.5 M hi of 62 melted a lot yesterday; about twice the amount in the shade.
2/16/2011 7:00 AM 0.00 0.0 M T M mostly bare in the sun; about 2-3" in the shade
2/17/2011 7:00 AM 0.00 0.0 M T M no snow left in the sun but about 1.5" in the shade
2/18/2011 7:00 AM 0.00 0.0 M T M no snow left in the sun but about 1.5" in the shade
2/23/2011 7:00 AM 0.00 0.0 M T M still some decent patches of snow in the shade
2/24/2011 7:00 AM 0.00 0.0 M T M About 0.5" in the shade
2/25/2011 7:00 AM 0.02 0.3 M 0.5 M S- to S-- overnight, began after 7pm, still occurring at 0700
2/26/2011 7:00 AM 0.02 0.3 M 0.5 M off and on S- to S-- until ~1730LT
2/27/2011 7:00 AM 0.00 0.0 M T M Patches of snow left in the shade.
2/28/2011 7:00 AM T T M T M A brief period of S- around 7pm, happened to see it when i turned on the lights. Otherwise still some old snow left in the shade.
3/1/2011 7:00 AM 0.00 0.0 M T M Some snow left in the shade
3/3/2011 7:00 AM 0.00 0.0 M T M still a little snow and ice left in the shade
3/4/2011 7:00 AM T 0.0 M 0.0 M All snow in the shade gone (some still in the neighborhood in the shady areas). Trace of rain with ocnl R-/R-- ~22-2400 LT.
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 0.02 0.0 M 0.0 M off and on freezing drizzle began about 230am with a glaze of ice on exposed surfaces.
3/8/2011 7:00 AM 0.01 0.1 M T M off and on light freezing drizzle and S-- with barely 0.01" melted by 9pm, only a trace of some SW- overnight.
3/9/2011 7:00 AM T T M 0.0 M some off and on snow flurries/S-- mainly morning to early afternoon
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 0.09 T M 0.0 M rain showers beginning about 230 am ended before 7am. mixed with some wet snow at times but no accumulation.
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 0.05 0.1 M T M A few sprinkles of rain between 630-8pm (T) then S-/SW- with some snow pellets til about 9pm, brief S but mainly S- until well after midnight. Never came down hard; 0.1" on exposed surfaces.
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 0.00 0.0 M 0.0 M
3/25/2011 7:00 AM 0.00 0.0 M 0.0 M
3/28/2011 7:00 AM T T M 0.0 M some light snow seen around 0600, briefly led to a dusting on the porch but melted before 0800.
3/29/2011 7:00 AM 0.19 1.3 M 1.0 M may have been a trace of snow in the morning, then some very light drizzle between 9-11pm, snow came between 1130pm-4am.
3/30/2011 7:00 AM 0.00 0.0 M T M half inch of snow left in the shady areas
3/31/2011 7:00 AM 0.00 0.0 M 0.0 M toast;y low of 46
4/1/2011 7:00 AM 0.00 0.0 M 0.0 M overnight low of 52
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 Hi of 83
4/4/2011 7:00 AM 0.18 0.4 M T M Strong cold front came by ~850am after a high of 61, some sprinkles by 10am continued until 1200 (T), then up to R, maybe one rumble of thunder, also very small ice pellets (more like A then sleet) grain size covered porch by ~1215, also ocnly mixed with snow, by 1300 0.13" but then not much all afternoon (another 0.02" by 1730). Finally a couple of periods of S- to S, one around 1830 left 0.1", this melted then another about 2100 left 0.3", around 0.2" on the ground this morning.
4/5/2011 7:00 AM 0.00 0.0 M 0.0 M
4/6/2011 7:00 AM 0.00 0.0 M 0.0 M
4/7/2011 7:00 AM 0.01 0.0 M 0.0 M Some drizzle in the morning (T) then some ocnl R- ~5-7pm (0.01)
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 0.14 0.2 M T M More graupel than snow. Most fell after midnight and before 6am. Heard some thunder around 3am.
4/13/2011 7:00 AM 0.00 0.0 M 0.0 M
4/14/2011 7:00 AM 1.00 2.4 M 2.5 M Finally! R-- began ~1845, by 2200 0.23" new, R to R- and 40, at 0130 R-S- mix (no accum yet) temp of 36 and another 0.36", then 2.4" snow with 0.41" melted by 0700. 31 and S- (ocnl S) at 0700, but ended soon after.
4/18/2011 7:00 AM 0.00 0.0 M 0.0 M
4/19/2011 7:00 AM 0.18 0.0 M 0.0 M rain began at 9pm, most over by 1030pm
4/20/2011 7:00 AM 0.00 0.0 M 0.0 M May have been a trace around noon (thunder occurred) and in the evening, but not there to see either.
4/21/2011 7:00 AM 0.15 T M 0.0 M snow flurries (quite light) in the morning between ~0815 to ~1000 (T). R- began about 1930 but ended before 2130 (0.02") with some clearing, but another 0.01" by 1am. Then in the early morning hours got another 0.12"
4/22/2011 7:00 AM 0.03 0.0 M 0.0 M Showers between ~8-930pm, lightning as well after 830pm but was off to the east and did not hear thunder.
4/23/2011 7:00 AM T T M 0.0 M S- to S-- began about 630am.
4/24/2011 7:00 AM 0.03 0.3 M 0.0 M S- but a little harder a few times from ~0800-1000 with 0.1" by 0845 and another 0.2" by 1000 (all on the picnic table, trees, etc., none on the grass. Snow flurries continued until about noon (T)
4/25/2011 7:00 AM 0.26 0.0 M 0.0 M a few afternoon sprinkles but steady R- with ocnl R began at 5pm and most seemed over by 3am. 0.18" by 1030pm.
4/26/2011 7:00 AM 0.01 0.0 M 0.0 M A shower in the early to mid afternoon. Also a trace later in the evening.
4/27/2011 7:00 AM 0.05 T M 0.0 M off and on showers of rain mixed with very soft graupel and wet snow flakes, mostly from mid afternoon until about 9pm
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 T M 0.0 M A few sprinkles began ~650pm. Snow flurries seen by 930pm but appeared to end before 11pm.
5/1/2011 7:00 AM T T M 0.0 M only some brief snow flurries early to mid afternoon
5/2/2011 7:00 AM 0.00 0.0 M 0.0 M low of 29
5/3/2011 7:00 AM T T M 0.0 M a very brief flurry mixed with rain about 7pm (may have been more SW- earlier but not at home to see them)
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 low of 28
5/10/2011 7:00 AM 0.00 0.0 M 0.0 M
5/11/2011 7:00 AM 0.68 T M T M ocnl lightning mainly east-se then ne-e from 8-10pm but rain did not begin (rw-) until 1015pm. Woke up at 530am to heavy pcpn that was half wet snow which had started to accumulate a bit on the porch, but back to just R- and 36 (also the low) at 0700.
5/12/2011 7:00 AM 0.89 T M 0.0 M 0.45" 0700-1845, 0.24" 1845-2345, then another 0.20" overnight. Some snow mixed in the morning (maybe longer, left at 0900, mostly snow at times then but very wet and only S-)
5/13/2011 7:00 AM 0.14 0.0 M 0.0 M precip probably ended by mid afternoon
5/15/2011 7:45 AM 0.24 0.0 M 0.0 M Note ob taken at 745am. drizzle began around noon, then became R- ocnl R-- by ~4pm until past 9pm, then intermittent overnight. 0.04" by 1740LT and another 0.13" by 2200, then 0.07 after 2200. Not sure if any snow mixed in, did see some wet flakes mixed at 755am. Low of 35.
5/16/2011 7:00 AM 0.03 T M 0.0 M off and on R- until about 1030, mixed with a little very wet snow around 0800.
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
5/29/2011 7:00 AM 0.01 0.0 M 0.0 M off and on R- from about 7pm until about 10pm
5/30/2011 7:00 AM T 0.0 M 0.0 M A little off and on R-- and drizzle from ~0900-1030
5/31/2011 7:00 AM T 0.0 M 0.0 M a few sprinkles about 1230pm
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 High hit 90.
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 High of 90
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 7:00 AM 0.18 0.0 M 0.0 M A few sprinkles around 7-8pm, then thunder 10-~11pm but with just some brief R- (T), Think most of the rain fell with a heavier shower around 2AM.
6/10/2011 7:00 AM 0.01 0.0 M 0.0 M Hefty periods of drizzle in the morning
6/11/2011 7:00 AM 0.00 0.0 M 0.0 M
6/12/2011 7:00 AM 0.00 0.0 M 0.0 M
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 Some thunder in the evening, but no rain.
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 some thunder early afternoon but managed to miss everything
6/18/2011 7:00 AM T 0.0 M 0.0 M some thunder and a trace of rain mid afternoon
6/19/2011 7:00 AM T 0.0 M 0.0 M a few sprinkles around 730pm, then more at 9pm
6/20/2011 7:00 AM 0.89 0.0 M 0.0 M Some sprinkles and a little thunder at ~1730, then a tstm with 0.03" ~1930. More thunder after 2030, with rain again by 2100. Most of the thunder ended by~2230 but rained all night, over by 0600. low of 46.
6/21/2011 7:00 AM 0.01 0.0 M 0.0 M some R- began by 0900, plus off and on showers mid to late afternoon.
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 0.04 0.0 M 0.0 M A few big drops around 7pm. Then some thunder beginning about 720pm continued until close to 8pm, with an interesting period of huge drops coming down pretty hard, especially around 745-750pm, mainly after cloud base had moved east.
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 Hi of 94 (think this is hottest so far)
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 Hi of 98
6/30/2011 7:00 AM 0.01 0.0 M 0.0 M A couple of storms, one around 1pm, the other later in the afternoon.
7/1/2011 7:00 AM 0.11 0.0 M 0.0 M A tstm mid afternoon dropped 0.03", the 0.08" after 8pm and before 10pm in a tstm
7/2/2011 7:00 AM 0.09 M M M M off and on thunderfrom ~830-10pm. Brief tstm with hail (filed separate report, max size 3/8") ~945-955pm
7/3/2011 7:00 AM 0.00 0.0 M 0.0 M one rumble of thunder around 6pm but no precip
7/4/2011 7:00 AM T 0.0 M 0.0 M very windy with a weakening storm around 4pm, estimated gust to ~50mph; trace of rain in a brief shower, one rumble of thunder
7/5/2011 7:00 AM 0.00 0.0 M 0.0 M Hi of 99
7/6/2011 7:00 AM 0.01 0.0 M 0.0 M off and on R- to R-- ~4-9 pm. Did not hear any thunder but could have been some before 7pm.
7/7/2011 7:00 AM 0.05 0.0 M 0.0 M A quick tstm with lots of lightning around 4pm
7/8/2011 7:00 AM 1.09 0.0 M 0.0 M Lots of action! First storm was like the previous day with lots of lightning and not much rain ~430-5pm. Then a heavier tstm with much less lightning dropped another 0.24" by 6pm. More tstms after that, one with very heavy rain just before 10pm, by 10pm another 0.81", then another 0.01" sometime after 10pm.
7/9/2011 7:00 AM T 0.0 M 0.0 M a couple of threats of rain but only a few sprinkles around 7pm. Thunder around 1-130pm and again around 7pm.
7/10/2011 7:00 AM 0.61 0.0 M 0.0 M First storm missed to our north with thunder ~1400-1500, T rain. Then more thunder 1600-1645 with brief rain (0.04"), a strong tstm moved up from the south with heavy rain, a bit of soft hail and gusty winds 1730-1800 (0.55"), then one more shower around 2000 (0.02")
7/11/2011 7:00 AM 0.81 0.0 M 0.0 M Two main storms, one quick hitter with R+ and hail pea to a few 3/8" and crazy close lightning ~1415-1425, then a bigger storm with some more pea size hail between 1700-~1830, then a few showers after 11pm.
7/12/2011 7:00 AM 0.58 0.0 M 0.0 M long duration tstm with rain from about 4-7pm
7/13/2011 7:00 AM 0.14 0.0 M 0.0 M A trace of rain around 5pm, then another trace about 815pm, then off and on thunder with periods of rain, moderate for brief periods, from 9pm until about 230am.
7/14/2011 7:00 AM 0.04 0.0 M 0.0 M a trace of rain with some thunder 6-630 with storm to our north. Then tstm around 10pm
7/15/2011 7:00 AM 0.07 0.0 M 0.0 M not sure if there was thunder in late afternoon rain
7/16/2011 7:00 AM 0.01 0.0 M 0.0 M 2-day total of 0.02" in gage while away so used nearby station for report
7/17/2011 7:00 AM 0.01 0.0 M 0.0 M 2-day total of 0.02" in gage while away so used nearby station for report
7/18/2011 7:00 AM 0.00 0.0 M 0.0 M
7/19/2011 7:00 AM 0.00 0.0 M 0.0 M Hi of 95
7/20/2011 7:00 AM 0.02 0.0 M 0.0 M lots of lightning but only 0.02" from around 5-630pm
7/21/2011 7:00 AM 0.02 0.0 M 0.0 M may have been 3 storms, one mid afternoon (T), 0.02" in storm near 530pm, then another around 630pm (T) (all with thunder)
7/22/2011 7:00 AM 0.00 0.0 M 0.0 M
7/23/2011 7:00 AM 0.00 0.0 M 0.0 M
7/24/2011 7:00 AM 0.00 0.0 M 0.0 M
7/25/2011 7:00 AM 0.00 0.0 M 0.0 M
7/26/2011 7:00 AM 0.00 0.0 M 0.0 M
7/27/2011 7:00 AM 0.02 0.0 M 0.0 M A trace in a mid afternoon shower. Then a nice looking storm looked to be heading right for us from the south at 630pm but veered to the east slightly, with thunder and occasional R- through ~830pm for 0.02"
7/28/2011 7:00 AM 0.04 0.0 M 0.0 M Thought we would get more in main storm from 630-~815pm (0.04"). Trace around 1pm w/o thunder.
7/29/2011 7:00 AM 0.00 0.0 M 0.0 M may have been a trace in the early afternoon but no one home to see it.
7/30/2011 7:00 AM 0.01 0.0 M 0.0 M tstm ~630-705pm
7/31/2011 7:00 AM 0.00 0.0 M 0.0 M Hi of 96
8/1/2011 7:00 AM T 0.0 M 0.0 M a long period with thunder but only occasional raindrops, from about 630-8pm
8/2/2011 7:00 AM T 0.0 M 0.0 M some sprinkles in the afternoon
8/3/2011 7:00 AM 0.05 0.0 M 0.0 M off and on showers with a little thunder (not totally sure of this) in the afternoon (0.04"), then sprinkles at times in the evening, then period of R-- to R- (with some thunder around 10pm or so) from about 830-midnight but only 0.01"
8/4/2011 7:00 AM 0.00 0.0 M 0.0 M some thunder in the afternoon but no drops observed
8/5/2011 7:00 AM T 0.0 M 0.0 M some sprinkles around 6pm
8/6/2011 7:00 AM 0.00 0.0 M 0.0 M
8/7/2011 7:00 AM 0.00 0.0 M 0.0 M
8/8/2011 7:00 AM 0.00 0.0 M 0.0 M
8/9/2011 7:00 AM 0.00 0.0 M 0.0 M
8/10/2011 7:00 AM 0.00 0.0 M 0.0 M
8/11/2011 7:00 AM 0.00 0.0 M 0.0 M coolest night in awhile, low of 51
8/12/2011 7:00 AM 0.00 0.0 M 0.0 M
8/13/2011 7:00 AM 0.00 0.0 M 0.0 M
8/14/2011 7:00 AM 0.00 0.0 M 0.0 M
8/15/2011 7:00 AM 0.04 0.0 M 0.0 M lots of clouds and thunder but not much rain. few spinkles early aftn, then off and on thunder with some ocnl R- 2-~330pm (0.01) then a short tstm burst just before 4pm. one more rumble of thunder about 8pm with a trace.
8/17/2011 7:00 AM 0.17 0.0 M 0.0 M Finally some rain greater than a few hundreths. May have gotten a trace or so around 11am. About 0.10" in a mid afternoon tstm. Another 0.07 in a storm around 5pm with a great double rainbow!
8/18/2011 7:00 AM T 0.0 M 0.0 M a few sprinkles around 6pm
8/19/2011 7:00 AM 0.00 0.0 M 0.0 M high of 99
8/20/2011 7:00 AM 0.11 0.0 M 0.0 M Showers and Tstms began about 5pm, 0.05" at 9pm, another 0.06" after that, not sure though when it all came.
8/21/2011 7:00 AM T 0.0 M 0.0 M some sprinkles around 10pm with lightning to the northeast
8/22/2011 7:00 AM 0.00 0.0 M 0.0 M
8/23/2011 7:00 AM T 0.0 M 0.0 M not sure if a trace fell late in the morning, but some thunder with a trace of rain around 8pm.
8/24/2011 7:00 AM 0.00 0.0 M 0.0 M
8/25/2011 7:00 AM 0.00 0.0 M 0.0 M
8/26/2011 7:00 AM T 0.0 M 0.0 M almost able to round up to a whooping 0.01 but not quite. Off and on light rain for about 15 min around 730pm, distant lightning.
8/27/2011 7:00 AM T 0.0 M 0.0 M
8/28/2011 7:00 AM T 0.0 M 0.0 M
8/29/2011 7:00 AM 0.02 0.0 M 0.0 M Lots of clouds but not a lot of precip. Some sprinkles around 2pm, more 4-645pm with a little thunder around 5pm, then a period of R- 645-745pm with 0.02, then a few more sprinkles around 9-10pm. Heard thunder about 1130pm but did not hear rain.
8/30/2011 7:00 AM 0.00 0.0 M 0.0 M disappointingly dry!
8/31/2011 7:00 AM T 0.0 M 0.0 M some sprinkles wet the ground around 8pm. Very windy in north BOU with some light rain 9-1015pm.
9/1/2011 7:00 AM 0.00 0.0 M 0.0 M very strong (estimated 40-50 mph) downburst type winds for about 30 min around 7pm but no rain.
9/2/2011 7:00 AM T 0.0 M 0.0 M some off and on R- about 615-700pm
9/3/2011 7:00 AM T 0.0 M 0.0 M a few sprinkles around 530pm
9/4/2011 7:00 AM 0.00 0.0 M 0.0 M low of 42
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 0.07 0.0 M 0.0 M some sprinkles around 1030, then off and on R-- ocnl R- mid afternoon on, picking up after midnight. 0.01 by 1830 then another 0.01 by midnight, rest after that.
9/8/2011 7:00 AM 0.68 0.0 M 0.0 M Great rain finally! R- began at ~0940 then picked up. By 1800 had 0.66, then a bit more (0.01) before ended by 2100.
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 0.02 0.0 M 0.0 M some evening sprinkles then a period of R- beginning just before midnight.
9/14/2011 7:00 AM 0.02 0.0 M 0.0 M a few sprinkles in the early evening then a shower/tstm about 915-10 with 0.02
9/15/2011 7:00 AM 0.94 0.0 M 0.0 M a little drizzle and sprinkles until ~5pm, then pretty steady moderate rain, 0.61" at 10pm, another 0.31 by 130am with 0.03" after that.
9/16/2011 7:00 AM 0.01 0.0 M 0.0 M showers late in the afternoon
9/17/2011 7:00 AM 0.00 0.0 M 0.0 M
9/18/2011 7:00 AM T 0.0 M 0.0 M a 15-20 min period of R- around 2pm
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 T 0.0 M 0.0 M some sprinkles off and on from about 7 pm until probably after midnight
9/22/2011 7:00 AM 0.05 0.0 M 0.0 M a lengthy shower along with some thunder from ~615 pm to ~745 pm. Overnight low of 35 as it was clear by 11pm with a light frost on the roof and porch.
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
7/1/2011 9:45 PM 0.08" total, rained pretty hard for 5-10 min with hail most of the time. Near 75th and Baseline, Boulder. 3/8" 1/4" Pea Size Rice Hard 7 2min no damage Continuous False Same time as rain Same time as smaller hail 0
7/10/2011 2:18 PM Brief very heavy rain also (near 75th and Baseline). Crazy close and loud lightning 3/8" 1/4" Pea Size 1/4" Pea Size Hard 3 2min no damage Continuous False After rain Same time as smaller hail