Station Overview Station Location
Station Number CO-BO-146 Latitude 40.226333
Station Name Lyons 0.3 NNE Longitude -105.266667
County Boulder Elevation (ft) 5399



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 09 1.07 1.76 31 1.76 31 0.00 0 0 11 4 13.9 5 7
Nov 09 0.86 0.62 30 0.62 30 0.00 0 0 2 1 4.9 1 4
Dec 09 0.50 1.05 31 1.05 31 0.00 0 0 8 3 14.9 8 27
Jan 10 0.48 0.29 31 0.29 31 0.00 0 0 3 1 3.7 3 23
Feb 10 0.56 0.80 28 0.80 28 0.00 0 0 9 3 12.3 9 20
March 10 1.57 1.88 31 1.88 31 0.00 0 0 7 2 15.6 6 7
April 10 2.00 4.12 30 4.12 30 0.00 0 0 9 5 5.9 3 3
May 10 2.48 2.55 31 2.55 31 0.00 0 0 10 3 2.2 2 2
June 10 2.26 2.67 30 2.67 30 0.00 0 0 7 0 0.0 0 0
July 10 1.72 2.14 31 2.14 31 0.00 0 0 12 4 0.0 0 0
Aug 10 1.41 1.03 31 1.03 31 0.00 0 0 9 4 0.0 0 0
Sept 10 1.57 0.12 30 0.12 30 0.00 0 0 3 1 0.0 0 0
Water Year Totals: 16.48" 19.03" 365 days 19.03" 365 0.00" 0 days 0 90 days 31 days 73.4" 37 days 93 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
10/1/2009 T
10/2/2009 0.00
10/3/2009 0.00
10/4/2009 0.00
10/5/2009 0.03
10/6/2009 0.03
10/7/2009 0.00
10/8/2009 0.03
10/9/2009 0.10
10/10/2009 0.29
10/11/2009 0.01
10/12/2009 T
10/13/2009 0.00
10/14/2009 0.00
10/15/2009 0.00
10/16/2009 0.00
10/17/2009 0.00
10/18/2009 0.00
10/19/2009 0.00
10/20/2009 0.00
10/21/2009 0.12
10/22/2009 0.10
10/23/2009 0.00
10/24/2009 0.00
10/25/2009 T
10/26/2009 0.12
10/27/2009 0.00
10/28/2009 0.65
10/29/2009 0.28
10/30/2009 T
10/31/2009 0.00
11/1/2009 0.00
11/2/2009 0.00
11/3/2009 0.00
11/4/2009 0.00
11/5/2009 0.00
11/6/2009 0.00
11/7/2009 0.00
11/8/2009 0.00
11/9/2009 0.00
11/10/2009 0.00
11/11/2009 0.00
11/12/2009 0.00
11/13/2009 0.00
11/14/2009 0.07
11/15/2009 0.55
11/16/2009 0.00
11/17/2009 0.00
11/18/2009 0.00
11/19/2009 0.00
11/20/2009 0.00
11/21/2009 0.00
11/22/2009 0.00
11/23/2009 0.00
11/24/2009 0.00
11/25/2009 0.00
11/26/2009 0.00
11/27/2009 0.00
11/28/2009 0.00
11/29/2009 T
11/30/2009 0.00
12/1/2009 0.00
12/2/2009 0.23
12/3/2009 0.05
12/4/2009 0.00
12/5/2009 0.00
12/6/2009 0.12
12/7/2009 0.07
12/8/2009 0.09
12/9/2009 0.04
12/10/2009 0.00
12/11/2009 0.00
12/12/2009 0.00
12/13/2009 0.00
12/14/2009 T
12/15/2009 0.00
12/16/2009 0.00
12/17/2009 0.00
12/18/2009 0.00
12/19/2009 0.00
12/20/2009 0.00
12/21/2009 0.00
12/22/2009 0.00
12/23/2009 0.19
12/24/2009 0.26
12/25/2009 0.00
12/26/2009 T
12/27/2009 T
12/28/2009 0.00
12/29/2009 0.00
12/30/2009 0.00
12/31/2009 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2010 0.00
1/2/2010 0.00
1/3/2010 0.00
1/4/2010 0.02
1/5/2010 0.00
1/6/2010 0.00
1/7/2010 0.15
1/8/2010 0.00
1/9/2010 0.00
1/10/2010 0.00
1/11/2010 0.00
1/12/2010 0.00
1/13/2010 0.00
1/14/2010 0.00
1/15/2010 0.00
1/16/2010 0.00
1/17/2010 0.00
1/18/2010 0.00
1/19/2010 0.00
1/20/2010 0.00
1/21/2010 0.00
1/22/2010 0.00
1/23/2010 0.00
1/24/2010 0.00
1/25/2010 0.00
1/26/2010 0.00
1/27/2010 0.00
1/28/2010 0.12
1/29/2010 T
1/30/2010 0.00
1/31/2010 0.00
2/1/2010 0.00
2/2/2010 0.00
2/3/2010 0.00
2/4/2010 0.05
2/5/2010 T
2/6/2010 0.00
2/7/2010 T
2/8/2010 0.14
2/9/2010 0.07
2/10/2010 0.00
2/11/2010 0.00
2/12/2010 0.00
2/13/2010 0.00
2/14/2010 0.05
2/15/2010 T
2/16/2010 0.00
2/17/2010 0.00
2/18/2010 0.00
2/19/2010 0.13
2/20/2010 0.06
2/21/2010 0.10
2/22/2010 0.12
2/23/2010 0.00
2/24/2010 0.00
2/25/2010 0.00
2/26/2010 0.08
2/27/2010 0.00
2/28/2010 0.00
3/1/2010 0.07
3/2/2010 0.00
3/3/2010 0.00
3/4/2010 0.00
3/5/2010 0.00
3/6/2010 0.00
3/7/2010 0.00
3/8/2010 0.00
3/9/2010 0.00
3/10/2010 T
3/11/2010 0.19
3/12/2010 0.00
3/13/2010 0.00
3/14/2010 0.00
3/15/2010 0.05
3/16/2010 0.00
3/17/2010 0.00
3/18/2010 0.00
3/19/2010 0.26
3/20/2010 0.42
3/21/2010 0.00
3/22/2010 0.00
3/23/2010 0.00
3/24/2010 0.84
3/25/2010 T
3/26/2010 0.00
3/27/2010 0.05
3/28/2010 0.00
3/29/2010 0.00
3/30/2010 0.00
3/31/2010 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2010 0.00
4/2/2010 T
4/3/2010 0.00
4/4/2010 T
4/5/2010 T
4/6/2010 0.14
4/7/2010 0.06
4/8/2010 T
4/9/2010 0.00
4/10/2010 0.00
4/11/2010 0.00
4/12/2010 0.00
4/13/2010 0.00
4/14/2010 0.00
4/15/2010 0.00
4/16/2010 0.00
4/17/2010 0.00
4/18/2010 0.09
4/19/2010 0.00
4/20/2010 0.00
4/21/2010 0.00
4/22/2010 1.31
4/23/2010 0.74
4/24/2010 0.95
4/25/2010 T
4/26/2010 0.25
4/27/2010 0.00
4/28/2010 0.00
4/29/2010 0.57
4/30/2010 0.01
5/1/2010 0.00
5/2/2010 0.00
5/3/2010 0.41
5/4/2010 0.00
5/5/2010 0.00
5/6/2010 0.00
5/7/2010 0.12
5/8/2010 0.00
5/9/2010 T
5/10/2010 0.00
5/11/2010 0.00
5/12/2010 1.26
5/13/2010 0.09
5/14/2010 0.10
5/15/2010 0.42
5/16/2010 T
5/17/2010 0.01
5/18/2010 0.00
5/19/2010 0.08
5/20/2010 0.03
5/21/2010 0.00
5/22/2010 0.00
5/23/2010 0.00
5/24/2010 0.00
5/25/2010 0.00
5/26/2010 0.00
5/27/2010 T
5/28/2010 0.00
5/29/2010 0.00
5/30/2010 0.03
5/31/2010 0.00
6/1/2010 0.00
6/2/2010 0.00
6/3/2010 0.00
6/4/2010 0.00
6/5/2010 0.00
6/6/2010 0.00
6/7/2010 0.00
6/8/2010 0.00
6/9/2010 0.47
6/10/2010 0.00
6/11/2010 0.08
6/12/2010 1.18
6/13/2010 0.35
6/14/2010 0.29
6/15/2010 0.05
6/16/2010 0.00
6/17/2010 0.00
6/18/2010 0.00
6/19/2010 0.00
6/20/2010 0.00
6/21/2010 0.00
6/22/2010 0.00
6/23/2010 0.00
6/24/2010 0.00
6/25/2010 0.00
6/26/2010 0.00
6/27/2010 0.25
6/28/2010 0.00
6/29/2010 0.00
6/30/2010 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2010 0.00
7/2/2010 T
7/3/2010 0.05
7/4/2010 0.02
7/5/2010 0.18
7/6/2010 0.00
7/7/2010 0.50
7/8/2010 0.31
7/9/2010 0.07
7/10/2010 0.00
7/11/2010 T
7/12/2010 0.06
7/13/2010 0.00
7/14/2010 0.00
7/15/2010 0.00
7/16/2010 0.00
7/17/2010 0.00
7/18/2010 T
7/19/2010 T
7/20/2010 0.00
7/21/2010 0.26
7/22/2010 0.14
7/23/2010 0.00
7/24/2010 0.00
7/25/2010 0.00
7/26/2010 0.00
7/27/2010 0.00
7/28/2010 0.08
7/29/2010 0.03
7/30/2010 0.44
7/31/2010 0.00
8/1/2010 0.00
8/2/2010 0.05
8/3/2010 0.07
8/4/2010 0.18
8/5/2010 0.10
8/6/2010 0.00
8/7/2010 0.01
8/8/2010 0.12
8/9/2010 0.00
8/10/2010 0.01
8/11/2010 0.00
8/12/2010 0.00
8/13/2010 T
8/14/2010 0.00
8/15/2010 0.00
8/16/2010 T
8/17/2010 0.47
8/18/2010 0.00
8/19/2010 0.00
8/20/2010 0.02
8/21/2010 0.00
8/22/2010 0.00
8/23/2010 0.00
8/24/2010 T
8/25/2010 T
8/26/2010 0.00
8/27/2010 0.00
8/28/2010 0.00
8/29/2010 0.00
8/30/2010 0.00
8/31/2010 0.00
9/1/2010 T
9/2/2010 0.00
9/3/2010 0.00
9/4/2010 0.00
9/5/2010 0.00
9/6/2010 0.00
9/7/2010 0.00
9/8/2010 0.00
9/9/2010 0.03
9/10/2010 0.00
9/11/2010 0.00
9/12/2010 0.00
9/13/2010 0.00
9/14/2010 0.00
9/15/2010 0.00
9/16/2010 0.00
9/17/2010 0.00
9/18/2010 0.00
9/19/2010 0.02
9/20/2010 0.00
9/21/2010 0.00
9/22/2010 0.00
9/23/2010 0.07
9/24/2010 0.00
9/25/2010 0.00
9/26/2010 0.00
9/27/2010 0.00
9/28/2010 0.00
9/29/2010 0.00
9/30/2010 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2009 7:00 AM T M M M M High 82F. Low 41F.
10/2/2009 7:00 AM 0.00 0.0 M M M High 57F. Low 31F.
10/3/2009 7:00 AM 0.00 0.0 M M M High 61F. Low 31F.
10/4/2009 7:00 AM 0.00 0.0 M M M
10/5/2009 7:00 AM 0.03 M M M M High 51F. Low 40F. Light rain in evening.
10/6/2009 7:00 AM 0.03 M M M M Low 28F. Heavy frost on cars and roofs.
10/7/2009 7:00 AM 0.00 0.0 M M M High 61F. Low 33F.
10/8/2009 7:00 AM 0.03 M M M M High 65F. Low 33F. Rain starting out very light, increasing.
10/9/2009 7:00 AM 0.10 T M M M High low-mid 30s. Rain/snow mix ending around nightfall. Low 32F.
10/10/2009 7:00 AM 0.29 5.3 M 5.0 M High near 60. Low 17F. Snow beginning around nightfall.
10/11/2009 7:00 AM 0.01 0.6 M 2.5 M High 33F. Overnight low 22F. Light snow in the morning ending midday.
10/12/2009 7:00 AM T M M 2.0 M Some flurries.High 32F. Low 24F.
10/13/2009 7:00 AM 0.00 0.0 M T M High 49F. Low 33F.
10/14/2009 7:00 AM 0.00 0.0 M M M High 55F. Low 33F.
10/15/2009 7:00 AM 0.00 0.0 M M M Overnight low 43F.
10/16/2009 7:00 AM 0.00 0.0 M M M Overnight low 36F.
10/17/2009 7:00 AM 0.00 0.0 M M M High 63F. Overnight low 34F.
10/18/2009 7:00 AM 0.00 0.0 M M M
10/19/2009 7:00 AM 0.00 0.0 M M M
10/20/2009 7:00 AM 0.00 0.0 M M M
10/21/2009 7:00 AM 0.12 M M M M Overnight low and current temp 36F. Rain trying to change to snow around observation time.
10/22/2009 7:00 AM 0.10 M M M M Rain snow mix in the first half of the day. High 42F. Low 34F.
10/23/2009 7:00 AM 0.00 0.0 M M M
10/24/2009 7:00 AM 0.00 0.0 M M M
10/25/2009 7:00 AM T M M M M High 67F. Windy. Low 37F. Trace rainfall 4:30pm to 5:30pm. Again light rain at 6:45am.
10/26/2009 7:00 AM 0.12 0.2 M T M High 39F early in the day. Mix of rain and snow becoming mostly snow throughout the day as the temp dropped to the low 30s but stayed above freezing until nightfall. Particularly thick snow in separate showers at 12:30pm and 1:30pm. Graupel 4:45pm-5pm. No accumulation during day, but 0.2" snowfall overnight. Low and current temp 19F.
10/27/2009 7:00 AM 0.00 0.0 M M M High 58F. Low 35F.
10/28/2009 7:00 AM 0.65 2.2 M 2.0 M Rain began 5-5:30pm, slow but steady throughout the evening, changing over to snow at 9:45pm. 0.30" rain, 0.35" water content in 2.2" snow. Low 29F.
10/29/2009 7:00 AM 0.28 5.6 M 6.5 M High 32F. Low 24F. Snow lighter after 6pm. 6pm reading: 5.2" snow and 0.26" water. At 7am reading: 0.4" snow additional with 0.02" water content. Very light snow continuing.
10/30/2009 7:00 AM T T M 6.5 M High 33F. Low 18F. Periods of light snowfall.
10/31/2009 7:00 AM 0.00 0.0 M 1.0 M High 52F. Low 32F.
11/1/2009 7:00 AM 0.00 0.0 M T M High in the 60s. Low 38F.
11/2/2009 7:00 AM 0.00 0.0 M 0.0 M High upper 60s. Low 33F. Sunny.
11/3/2009 7:00 AM 0.00 0.0 M 0.0 M High in the 40s. Low 29F.
11/4/2009 7:00 AM 0.00 0.0 M 0.0 M Low 28F.
11/5/2009 7:00 AM 0.00 0.0 M 0.0 M High in the 60s. Overnight low 34F. 43F current temp.
11/6/2009 7:00 AM 0.00 0.0 M M M Daytime high 76F. Overnight 46F, but temps rose back into the 50s for a while.
11/7/2009 7:00 AM 0.00 0.0 M 0.0 M
11/8/2009 7:00 AM 0.00 0.0 M 0.0 M High 72F. Low 39F.
11/9/2009 7:00 AM 0.00 0.0 M 0.0 M High 62F. Low 34F.
11/10/2009 7:00 AM 0.00 0.0 M 0.0 M Low 28F.
11/11/2009 7:00 AM 0.00 0.0 M 0.0 M
11/12/2009 7:00 AM 0.00 0.0 M 0.0 M High 69F. Low 40F.
11/13/2009 7:00 AM 0.00 0.0 M 0.0 M High 70s. Low 35F. Overcast at observation time.
11/14/2009 7:00 AM 0.07 T M 0.0 M High 42F. Low 32F. Rain/snow mix in afternoon.
11/15/2009 6:45 AM 0.55 4.9 M 5.0 M High around 40F. Low 28F. Light snow continues.
11/16/2009 7:00 AM 0.00 0.0 M M M
11/17/2009 7:00 AM 0.00 0.0 M 2.5 M
11/18/2009 7:00 AM 0.00 0.0 M 2.0 M
11/19/2009 7:00 AM 0.00 0.0 M 0.5 M
11/20/2009 7:00 AM 0.00 0.0 M T M
11/21/2009 7:00 AM 0.00 0.0 M T M
11/22/2009 7:00 AM 0.00 0.0 M T M
11/23/2009 7:00 AM 0.00 0.0 M T M
11/24/2009 7:00 AM 0.00 0.0 M T M
11/25/2009 7:00 AM 0.00 0.0 M T M
11/26/2009 7:00 AM 0.00 0.0 M T M
11/27/2009 7:00 AM 0.00 0.0 M T M High in the 60s. Low 29F.
11/28/2009 7:00 AM 0.00 0.0 M T M
11/29/2009 7:00 AM T T M T M Trace snow overnight.
11/30/2009 7:00 AM 0.00 0.0 M T M
12/1/2009 7:00 AM 0.00 0.0 M M M
12/2/2009 7:00 AM 0.23 3.9 M 4.0 M Snow overnight, continuing.
12/3/2009 7:00 AM 0.05 0.5 M 4.0 M Low -1F at dawn.
12/4/2009 7:00 AM 0.00 0.0 M 3.0 M Low -1F.
12/5/2009 7:00 AM 0.00 0.0 M 2.5 M
12/6/2009 7:00 AM 0.12 2.0 M 4.0 M Low around 12F. Snow overnight and continuing.
12/7/2009 7:00 AM 0.07 1.0 M 4.0 M
12/8/2009 7:00 AM 0.09 0.9 M 4.0 M Snow resuming sometime prior to 5am. Overnight low 5F.
12/9/2009 7:00 AM 0.04 0.5 M 4.0 M Overnight low -14F.
12/10/2009 7:00 AM 0.00 0.0 M 4.0 M Overnight low around 0F, however, winds during the night buoyed temps to the mid teens. Currently 9F.
12/11/2009 7:00 AM 0.00 0.0 M 4.0 M Overnight low 3F.
12/12/2009 7:00 AM 0.00 0.0 M 3.5 M
12/13/2009 7:00 AM 0.00 0.0 M 3.0 M Mostly sunny and breezy. Temps in the 40s. Overnight low 27F.
12/14/2009 7:00 AM T 0.0 M 1.5 M Trace rainfall.
12/15/2009 7:00 AM 0.00 0.0 M 2.0 M
12/16/2009 7:00 AM 0.00 0.0 M 1.5 M Overnight low 32F, but rising back up to 45F overnight.
12/17/2009 7:00 AM 0.00 0.0 M 0.5 M High mid 40s. Low 29F.
12/18/2009 7:00 AM 0.00 0.0 M 0.5 M
12/19/2009 7:00 AM 0.00 0.0 M 0.5 M
12/20/2009 7:00 AM 0.00 0.0 M T M High 46F. Low 27F.
12/21/2009 7:00 AM 0.00 0.0 M T M High in the 50s.
12/22/2009 7:00 AM 0.00 0.0 M T M
12/23/2009 7:00 AM 0.19 2.6 M 2.5 M
12/24/2009 7:00 AM 0.26 3.5 M 5.0 M Drifted snow--hard to get an accurate measurement.Overnight low and current temp -1F.
12/25/2009 7:00 AM 0.00 0.0 M 5.0 M
12/26/2009 7:00 AM T T M 5.0 M High 29F. Low 20F. Light snow in early morning hours and continuing.
12/27/2009 7:00 AM T T M 5.0 M Light snow until mid-morning.
12/28/2009 7:00 AM 0.00 0.0 M 4.0 M
12/29/2009 7:00 AM 0.00 0.0 M 4.5 M
12/30/2009 7:00 AM 0.00 0.0 M 3.5 M
12/31/2009 7:00 AM 0.00 0.0 M 3.5 M
1/1/2010 7:00 AM 0.00 0.0 M 3.0 M
1/2/2010 7:00 AM 0.00 0.0 M 3.0 M High upper 30s. Low 17F.
1/3/2010 7:00 AM 0.00 0.0 M 2.5 M High in the upper 40s. Low 22F.
1/4/2010 7:00 AM 0.02 0.2 M 3.0 M
1/5/2010 7:00 AM 0.00 0.0 M 3.0 M
1/6/2010 7:00 AM 0.00 0.0 M 2.5 M Overnight temps between 30 and 40F. Colder now and increasing clouds.
1/7/2010 7:00 AM 0.15 2.6 M 5.0 M Snow throughout the day and ending in the evening. Light winds. Overnight low -9F.
1/8/2010 7:00 AM 0.00 0.0 M 4.0 M High in the low teens. Overnight -4F.
1/9/2010 7:00 AM 0.00 0.0 M 4.0 M High 33F. Low 16F.
1/10/2010 7:00 AM 0.00 0.0 M 3.0 M
1/11/2010 7:00 AM 0.00 0.0 M 3.0 M High in the mid to upper 40s. Low 21F.
1/12/2010 7:00 AM 0.00 0.0 M 2.5 M Daytime high upper 40s. Low 21F.
1/13/2010 7:00 AM 0.00 0.0 M 2.0 M High upper 50s. Overnight low 30F.
1/14/2010 7:00 AM 0.00 0.0 M 1.0 M
1/15/2010 7:00 AM 0.00 0.0 M 0.5 M
1/16/2010 7:00 AM 0.00 0.0 M 1.0 M
1/17/2010 7:00 AM 0.00 0.0 M 0.5 M
1/18/2010 7:00 AM 0.00 0.0 M M M High in the low 50s. Overnight low 25F.
1/19/2010 7:00 AM 0.00 0.0 M 0.5 M
1/20/2010 7:00 AM 0.00 0.0 M 0.5 M
1/21/2010 7:00 AM 0.00 0.0 M 0.5 M
1/22/2010 7:00 AM 0.00 0.0 M T M
1/23/2010 7:00 AM 0.00 0.0 M T M
1/24/2010 7:00 AM 0.00 0.0 M T M
1/25/2010 7:00 AM 0.00 0.0 M T M
1/26/2010 7:00 AM 0.00 0.0 M T M
1/27/2010 7:00 AM 0.00 0.0 M T M
1/28/2010 7:00 AM 0.12 0.9 M 1.0 M Light snow starting at nightfall and continuing overnight.
1/29/2010 7:00 AM T T M 1.0 M
1/30/2010 7:00 AM 0.00 0.0 M 0.5 M
1/31/2010 7:00 AM 0.00 0.0 M T M
2/1/2010 7:00 AM 0.00 0.0 M T M
2/2/2010 7:00 AM 0.00 0.0 M T M
2/3/2010 7:00 AM 0.00 0.0 M T M
2/4/2010 7:00 AM 0.05 0.9 M 1.0 M Temps in the 30s overnight. Low 31F. Snow tapering off.
2/5/2010 7:00 AM T T M T M
2/6/2010 7:00 AM 0.00 0.0 M T M
2/7/2010 7:00 AM T T M T M Light snow started shortly before obs time.
2/8/2010 7:00 AM 0.14 1.2 M 1.0 M Light snow throughout the day. Some light wind overnight and this morning. Some granular snow 8:30-9am. High 34F. Low 22F.
2/9/2010 7:00 AM 0.07 2.9 M 3.0 M High 26F. Low 1F.
2/10/2010 7:00 AM 0.00 0.0 M 2.5 M
2/11/2010 7:00 AM 0.00 0.0 M 1.0 M
2/12/2010 7:00 AM 0.00 0.0 M 0.5 M
2/13/2010 7:00 AM 0.00 0.0 M 0.5 M
2/14/2010 7:00 AM 0.05 1.2 M 1.0 M High 49F, Low 18F. Breezy during the day and a little this morning. Snow overnight and continuing.
2/15/2010 7:00 AM T T M 0.5 M Snow ending by approx 8:30am.
2/16/2010 7:00 AM 0.00 0.0 M 0.5 M
2/17/2010 7:00 AM 0.00 0.0 M T M
2/18/2010 7:00 AM 0.00 0.0 M T M
2/19/2010 7:00 AM 0.13 1.2 M 1.5 M
2/20/2010 7:00 AM 0.06 0.4 M 1.5 M
2/21/2010 7:00 AM 0.10 1.0 M 2.5 M
2/22/2010 7:00 AM 0.12 2.3 M 4.5 M Clear. Overnight low 4F.
2/23/2010 7:00 AM 0.00 0.0 M 4.0 M
2/24/2010 7:00 AM 0.00 0.0 M 3.5 M
2/25/2010 7:00 AM 0.00 0.0 M 3.0 M
2/26/2010 7:00 AM 0.08 1.2 M 3.0 M
2/27/2010 7:00 AM 0.00 0.0 M 1.5 M
2/28/2010 7:00 AM 0.00 0.0 M 0.5 M High 48F. Low 29F.
3/1/2010 7:00 AM 0.07 0.4 M 1.0 M Light snow mid afternoon through evening. Temps near freezing so early snowfall melted as it hit the ground. Low 27F.
3/2/2010 7:00 AM 0.00 0.0 M 0.5 M
3/3/2010 7:00 AM 0.00 0.0 M T M High in the 50s. Low 26F.
3/4/2010 7:00 AM 0.00 0.0 M T M
3/5/2010 7:00 AM 0.00 0.0 M T M High 50s. Low 25F.
3/6/2010 7:00 AM 0.00 0.0 M T M
3/7/2010 7:00 AM 0.00 0.0 M T M
3/8/2010 7:00 AM 0.00 0.0 M T M
3/9/2010 7:00 AM 0.00 0.0 M T M
3/10/2010 7:00 AM T M M T M
3/11/2010 7:00 AM 0.19 0.4 M T M Snow and rain during the day. Snowfall was likely greater than 0.4" but I didn't get home until nightfall to measure.
3/12/2010 7:00 AM 0.00 0.0 M M M
3/13/2010 7:00 AM 0.00 0.0 M 0.0 M
3/14/2010 7:00 AM 0.00 0.0 M M M
3/15/2010 7:00 AM 0.05 0.2 M T M 0.02" fell as rain in the afternoon. Low 32F.
3/16/2010 7:00 AM 0.00 0.0 M 0.0 M
3/17/2010 7:00 AM 0.00 0.0 M 0.0 M
3/18/2010 7:00 AM 0.00 0.0 M 0.0 M
3/19/2010 7:00 AM 0.26 3.8 M 4.0 M Light snow at 11:30pm. Approx 1" by 5am. Heavy snow at obs time.
3/20/2010 7:00 AM 0.42 4.2 M 7.0 M Snow ending midday. Flurries later around nightfall. Overnight 10F.
3/21/2010 7:00 AM 0.00 0.0 M 3.5 M
3/22/2010 7:00 AM 0.00 0.0 M T M
3/23/2010 7:00 AM 0.00 0.0 M T M
3/24/2010 7:00 AM 0.84 6.6 M 5.5 M Light rain starting around 2pm. Afternoon rain snow mix changing to snow by 4 or 5pm. Approx 4" and 0.61" water content by 9pm (includes rain). 2.6" snow and 0.23" water by 7am. Low 28F.
3/25/2010 7:00 AM T T M 1.0 M Snow becoming lighter and ending by 8:30am.
3/26/2010 7:00 AM 0.00 0.0 M M M
3/27/2010 7:00 AM 0.05 T M T M
3/28/2010 7:00 AM 0.00 0.0 M 0.0 M
3/29/2010 7:00 AM 0.00 0.0 M 0.0 M
3/30/2010 7:00 AM 0.00 0.0 M M M
3/31/2010 7:00 AM 0.00 0.0 M 0.0 M
4/1/2010 7:00 AM 0.00 0.0 M 0.0 M
4/2/2010 7:00 AM T T M 0.0 M In late afternoon trace rain and occasional snow flakes. Graupel around 2:45-3pm.
4/3/2010 7:00 AM 0.00 0.0 M M M
4/4/2010 7:00 AM T T M 0.0 M Trace rain and randomw snow flakes blowing in from the clouds to the west. Saw a brilliant meteor 6:20am east of Boulder.
4/5/2010 7:00 AM T T M 0.0 M Infrequent raindrops or snowflakes.
4/6/2010 7:00 AM 0.14 0.0 M 0.0 M Overnight rainfall.
4/7/2010 7:00 AM 0.06 1.1 M 1.0 M Snow starting overnight and continuing.
4/8/2010 7:00 AM T T M 0.0 M Light snow ending early in the day.
4/9/2010 7:00 AM 0.00 0.0 M 0.0 M
4/10/2010 7:00 AM 0.00 0.0 M 0.0 M
4/11/2010 7:00 AM 0.00 0.0 M 0.0 M
4/12/2010 7:00 AM 0.00 0.0 M 0.0 M
4/13/2010 7:00 AM 0.00 0.0 M 0.0 M
4/14/2010 7:00 AM 0.00 0.0 M 0.0 M
4/15/2010 7:00 AM 0.00 0.0 M 0.0 M
4/16/2010 7:00 AM 0.00 0.0 M 0.0 M
4/17/2010 7:00 AM 0.00 0.0 M 0.0 M
4/18/2010 7:00 AM 0.09 M M M M
4/19/2010 7:00 AM 0.00 0.0 M M M
4/20/2010 7:00 AM 0.00 0.0 M 0.0 M
4/21/2010 7:00 AM 0.00 0.0 M 0.0 M
4/22/2010 7:00 AM 1.31 M M 0.0 M Trace rain prior to the heavy downpour at ~6:25pm. Rec'd 0.39" in the next 15 minutes. Submitted heavy rain report. Reading at 10pm was 0.73" total. Morning total 1.31". Very light hail 6:20-6:40pm. Submitted hail report.
4/23/2010 7:00 AM 0.74 M M 0.0 M 0.04" by 5pm. Steady rain resumed around 7pm. 0.59" by 10pm. Light rain continuing.
4/24/2010 7:00 AM 0.95 T M 0.0 M Heavy rain sometime midday. Neighbor reported snow between approx 12:30pm and 1:30pm. 5pm reading: 0.92". Light rain in the evening.
4/25/2010 7:00 AM T M M 0.0 M Clearing and sunny in the p.m.
4/26/2010 7:00 AM 0.25 2.0 M 1.0 M 0.02" fell as rain in showers in the late afternoon and early evening. Change to snow between 9pm and 9:15pm. 2" snow with 0.23" water content.
4/27/2010 7:00 AM 0.00 0.0 M 0.0 M
4/28/2010 7:00 AM 0.00 0.0 M 0.0 M
4/29/2010 7:00 AM 0.57 2.8 M 2.5 M Rain/snowfall began overnight. At obs time found 0.20" water in the gauge then yielded 0.37" more from melted snow. Snow continues.
4/30/2010 7:00 AM 0.01 T M 0.0 M Snow ending in the morning.
5/1/2010 7:00 AM 0.00 0.0 M 0.0 M
5/2/2010 7:00 AM 0.00 0.0 M 0.0 M
5/3/2010 7:00 AM 0.41 M M 0.0 M Intense rain/hail shower early afternoon. Lots of soft rain fell from 1:15pm to 1:45pm leaving significant accumulation on the lawn. Reading at 3:15p was 0.41".
5/4/2010 7:00 AM 0.00 0.0 M 0.0 M
5/5/2010 7:00 AM 0.00 0.0 M 0.0 M
5/6/2010 7:00 AM 0.00 0.0 M 0.0 M
5/7/2010 7:00 AM 0.12 0.9 M 0.5 M Afternoon rain 0.03". Snow overnight producing 0.09" water content.
5/8/2010 7:00 AM 0.00 0.0 M 0.0 M
5/9/2010 7:00 AM T M M 0.0 M Early evening trace rainfall.
5/10/2010 7:00 AM 0.00 0.0 M 0.0 M
5/11/2010 7:00 AM 0.00 0.0 M 0.0 M
5/12/2010 7:00 AM 1.26 1.3 M 0.5 M Rain and rain/snow mix starting in the afternoon. By 8pm 0.77" water, some of which was accumulating as a small amount of slush (approx 0.2" depth). Overnight additional rain/snow accum 0.49". Overnight low 32F.
5/13/2010 7:00 AM 0.09 T M T M Rain/snow mix starting in late afternoon and turning to mostly snow by 8pm. Trace accumulation. Overnight low 29F.
5/14/2010 7:00 AM 0.10 M M 0.0 M Light rain throughout the evening.
5/15/2010 7:00 AM 0.42 M M 0.0 M Rain beginning in afternoon, 0.23" by 10pm. Overnight 0.19" additional.
5/16/2010 7:00 AM T 0.0 M 0.0 M
5/17/2010 7:00 AM 0.01 M M M M
5/18/2010 7:00 AM 0.00 0.0 M 0.0 M
5/19/2010 7:00 AM 0.08 M M 0.0 M Showers in late afternoon, ending by nightfall.
5/20/2010 7:00 AM 0.03 M M M M
5/21/2010 7:00 AM 0.00 0.0 M M M Heavy dew.
5/22/2010 7:00 AM 0.00 0.0 M M M
5/23/2010 7:00 AM 0.00 0.0 M M M High in the mid 80s. Very windy and extremely dry during the day. Overnight low 40F and thankfully more humid now.
5/24/2010 7:00 AM 0.00 0.0 M M M
5/25/2010 7:00 AM 0.00 0.0 M M M
5/26/2010 7:00 AM 0.00 0.0 M M M
5/27/2010 7:00 AM T M M M M
5/28/2010 7:00 AM 0.00 0.0 M M M
5/29/2010 7:00 AM 0.00 0.0 M M M
5/30/2010 7:00 AM 0.03 M M M M
5/31/2010 7:00 AM 0.00 0.0 M M M
6/1/2010 7:00 AM 0.00 0.0 M M M
6/2/2010 7:00 AM 0.00 0.0 M M M
6/3/2010 7:00 AM 0.00 0.0 M M M
6/4/2010 7:00 AM 0.00 0.0 M M M
6/5/2010 7:00 AM 0.00 0.0 M M M
6/6/2010 7:00 AM 0.00 0.0 M M M
6/7/2010 7:00 AM 0.00 0.0 M M M
6/8/2010 7:00 AM 0.00 0.0 M M M
6/9/2010 7:00 AM 0.47 M M M M 0.30" noted at 6pm when I got home. More showers throughout the evening. Rain finished by nightfall.
6/10/2010 7:00 AM 0.00 0.0 M M M
6/11/2010 7:00 AM 0.08 M M M M
6/12/2010 7:00 AM 1.18 M M M M 0.19" by 7pm. 0.23" by 7:15pm. 0.30" by 9pm. 0.49" by 12:20am.
6/13/2010 7:00 AM 0.35 M M M M Overcast, chilly, and light rain throughout most of the day. 11pm 0.21". 7am 0.35".
6/14/2010 7:00 AM 0.29 M M M M Cool, overcast, and intermittent showers. 0.18" by 5pm. 0.29" at obs time.
6/15/2010 7:00 AM 0.05 M M M M
6/16/2010 7:00 AM 0.00 0.0 M M M
6/17/2010 7:00 AM 0.00 0.0 M M M
6/18/2010 7:00 AM 0.00 0.0 M M M
6/19/2010 7:00 AM 0.00 0.0 M M M
6/20/2010 7:00 AM 0.00 0.0 M M M
6/21/2010 7:00 AM 0.00 0.0 M M M
6/22/2010 7:00 AM 0.00 0.0 M M M
6/23/2010 7:00 AM 0.00 0.0 M M M
6/24/2010 7:00 AM 0.00 0.0 M M M
6/25/2010 7:00 AM 0.00 0.0 M M M
6/26/2010 7:00 AM 0.00 0.0 M M M
6/27/2010 7:00 AM 0.25 M M M M Heavy afternoon shower (4:15pm - 5:15pm) producing 0.24" rain. Another shower earlier produced 0.01".
6/28/2010 7:00 AM 0.00 0.0 M M M
6/29/2010 7:00 AM 0.00 0.0 M M M
6/30/2010 7:00 AM 0.00 0.0 M M M
7/1/2010 7:00 AM 0.00 0.0 M M M
7/2/2010 7:00 AM T M M M M Evening trace showers.
7/3/2010 7:00 AM 0.05 M M M M Afternoon showers.
7/4/2010 7:00 AM 0.02 M M M M Afternoon trace showers. 5:45am-6am shower 0.02" with very light rain continuing, overcast.
7/5/2010 7:00 AM 0.18 M M M M Cloudy, rain in early evening. 8pm 0.08". 9:20pm 0.18". Overnight low 47F.
7/6/2010 7:00 AM 0.00 0.0 M M M
7/7/2010 7:00 AM 0.50 M M M M Very sudden onset of heavy rain at 9:05pm. 0.12" accum by 10pm. Very heavy cloudburst at 10:pm for 15 minutes producing 0.35". Light rain overnight and continuing. Overnight low 52F.
7/8/2010 7:00 AM 0.31 M M M M 0.08" recorded at 5:30pm before rain resumed.
7/9/2010 7:00 AM 0.07 M M M M Afternoon showers ending sometime before 5pm.
7/10/2010 7:00 AM 0.00 0.0 M M M
7/11/2010 7:00 AM T M M M M A few trace drops midday.
7/12/2010 7:00 AM 0.06 M M M M
7/13/2010 7:00 AM 0.00 0.0 M M M
7/14/2010 7:00 AM 0.00 0.0 M M M
7/15/2010 7:00 AM 0.00 0.0 M M M
7/16/2010 7:00 AM 0.00 0.0 M M M
7/17/2010 7:00 AM 0.00 0.0 M M M
7/18/2010 7:00 AM T M M M M 7:30pm trace.
7/19/2010 7:00 AM T M M M M Just a few drops.
7/20/2010 7:00 AM 0.00 0.0 M M M
7/21/2010 7:00 AM 0.26 M M M M
7/22/2010 7:00 AM 0.14 M M M M The rain had ended long before I got home around 5pm.
7/23/2010 7:00 AM 0.00 0.0 M M M
7/24/2010 7:00 AM 0.00 0.0 M M M
7/25/2010 7:00 AM 0.00 0.0 M M M
7/26/2010 7:00 AM 0.00 0.0 M M M
7/27/2010 7:00 AM 0.00 0.0 M M M
7/28/2010 7:00 AM 0.08 M M M M
7/29/2010 7:00 AM 0.03 M M M M Light evening rain.
7/30/2010 7:00 AM 0.44 M M M M Heavy rain midday.
7/31/2010 7:00 AM 0.00 0.0 M M M
8/1/2010 7:00 AM 0.00 0.0 M M M
8/2/2010 7:00 AM 0.05 M M M M
8/3/2010 7:00 AM 0.07 M M M M
8/4/2010 7:00 AM 0.18 M M M M
8/5/2010 7:00 AM 0.10 M M M M
8/6/2010 7:00 AM 0.00 0.0 M M M
8/7/2010 7:00 AM 0.01 M M M M Light rain 3:30pm to 3:45pm producing 0.01". Trace rain again around 9pm.
8/8/2010 7:00 AM 0.12 M M M M Rainfall with thunder and lightning 1:30-2am.
8/9/2010 7:00 AM 0.00 0.0 M M M
8/10/2010 7:00 AM 0.01 M M M M Trace at 7:30am, 8am. Again at 3pm. Lots of dark clouds and thunder but not much precip.
8/11/2010 7:00 AM 0.00 0.0 M M M
8/12/2010 7:00 AM 0.00 0.0 M M M
8/13/2010 7:00 AM T 0.0 M M M
8/14/2010 7:00 AM 0.00 0.0 M M M
8/15/2010 7:00 AM 0.00 0.0 M M M
8/16/2010 7:00 AM T M M M M Trace shower -- a few drops.
8/17/2010 7:00 AM 0.47 M M M M Brief period of heavy rain.
8/18/2010 7:00 AM 0.00 0.0 M M M
8/19/2010 7:00 AM 0.00 0.0 M M M Warm overnight. Low in the upper 60s.
8/20/2010 7:00 AM 0.02 M M M M
8/21/2010 7:00 AM 0.00 0.0 M M M
8/22/2010 7:00 AM 0.00 0.0 M M M
8/23/2010 7:00 AM 0.00 0.0 M M M
8/24/2010 7:00 AM T M M M M Awoke to overcast and very very light rain.
8/25/2010 7:00 AM T M M M M Overnight low 51F.
8/26/2010 7:00 AM 0.00 0.0 M M M
8/27/2010 7:00 AM 0.00 0.0 M M M
8/28/2010 7:00 AM 0.00 0.0 M M M
8/29/2010 7:00 AM 0.00 0.0 M M M
8/30/2010 7:00 AM 0.00 0.0 M M M
8/31/2010 7:00 AM 0.00 0.0 M M M
9/1/2010 7:00 AM T M M M M A few drops observed at 7:15am. Overnight low 49F.
9/2/2010 7:00 AM 0.00 0.0 M M M
9/3/2010 7:00 AM 0.00 0.0 M M M
9/4/2010 7:00 AM 0.00 0.0 M M M
9/5/2010 7:00 AM 0.00 0.0 M M M
9/6/2010 7:00 AM 0.00 0.0 M M M
9/7/2010 7:00 AM 0.00 0.0 M M M Heavy smoke in the air overnight.
9/8/2010 7:00 AM 0.00 0.0 M M M
9/9/2010 7:00 AM 0.03 M M M M
9/10/2010 7:00 AM 0.00 0.0 M M M
9/11/2010 7:00 AM 0.00 0.0 M M M
9/12/2010 7:00 AM 0.00 0.0 M M M
9/13/2010 7:00 AM 0.00 0.0 M M M
9/14/2010 7:00 AM 0.00 0.0 M M M
9/15/2010 7:00 AM 0.00 0.0 M M M
9/16/2010 7:00 AM 0.00 0.0 M M M
9/17/2010 7:00 AM 0.00 0.0 M M M
9/18/2010 7:00 AM 0.00 0.0 M M M
9/19/2010 7:00 AM 0.02 M M M M
9/20/2010 7:00 AM 0.00 0.0 M M M
9/21/2010 7:00 AM 0.00 0.0 M M M
9/22/2010 7:00 AM 0.00 0.0 M M M
9/23/2010 7:00 AM 0.07 M M M M
9/24/2010 7:00 AM 0.00 0.0 M M M
9/25/2010 7:00 AM 0.00 0.0 M M M
9/26/2010 7:00 AM 0.00 0.0 M M M
9/27/2010 7:00 AM 0.00 0.0 M M M
9/28/2010 7:00 AM 0.00 0.0 M M M
9/29/2010 7:00 AM 0.00 0.0 M M M
9/30/2010 7:00 AM 0.00 0.0 M M 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
4/21/2010 6:20 PM Very minimal hail. At first hard between 6:20 and 6:25pm, then occasional isolated small stones during heavy rainfall. Hail corresponded with heavy shower. 6:25pm-6:40pm that produced 0.39" rain. 1/4" Pea Size Rice Rice Hard|Clear Ice|White Ice 10 no damage Intermittent True Same time as rain After smaller hail vertical 0
5/2/2010 1:15 PM Returned home at 3:15pm after the hail event. My neighbor reported approx 30 minutes of lots of soft hail for a long time, with thunder and lightning, producing significant accumulation on the grass (guessing .5" to 1.0"), intermixed with rain. 1.5 hours afterwards I could still see piles of soft, slushy accumulation with soft hailstones apparent at 3:30pm. 0.41" precip including rain and melted hail measured at 3:30pm. NA 1/4" Pea Size NA Soft 30 no damage False