Station Overview Station Location
Station Number CO-SU-49 Latitude 39.637866
Station Name Silverthorne 1.4 SE Longitude -106.061845
County Summit Elevation (ft) 9044



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 1.21 0.06 1 0.06 1 0.00 0 0 1 0 0.0 0 0
Nov 10 1.04 1.12 25 1.12 25 0.00 0 0 10 0 20.0 10 13
Dec 10 1.16 2.94 26 2.94 26 0.00 0 0 10 6 32.5 10 26
Jan 11 0.88 1.39 20 1.39 20 0.00 0 0 9 2 24.9 9 20
Feb 11 0.91 2.03 19 2.03 19 0.00 0 0 11 1 32.0 11 19
March 11 1.24 2.44 19 2.44 19 0.00 0 0 11 2 38.3 11 19
April 11 1.34 4.63 20 4.63 20 0.00 0 0 11 1 45.0 10 20
May 11 1.23 1.88 10 1.88 10 0.00 0 0 7 0 16.7 5 3
June 11 1.33 0.79 3 0.79 3 0.00 0 0 3 0 0.0 0 0
July 11 1.74 2.33 8 2.33 8 0.00 0 0 7 1 0.0 0 0
Aug 11 1.67 0.85 7 0.85 7 0.00 0 0 7 0 0.0 0 0
Sept 11 1.30 1.03 4 1.03 4 0.00 0 0 4 0 0.0 0 0
Water Year Totals: 15.05" 21.49" 162 days 21.49" 162 0.00" 0 days 0 91 days 13 days 209.4" 66 days 120 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
10/2/2010
10/3/2010
10/4/2010
10/5/2010
10/6/2010
10/7/2010
10/8/2010
10/9/2010
10/10/2010
10/11/2010
10/12/2010
10/13/2010
10/14/2010
10/15/2010
10/16/2010
10/17/2010
10/18/2010
10/19/2010
10/20/2010
10/21/2010
10/22/2010
10/23/2010
10/24/2010
10/25/2010
10/26/2010
10/27/2010
10/28/2010
10/29/2010
10/30/2010
10/31/2010 0.06
11/1/2010 0.10
11/2/2010 0.00
11/3/2010 0.00
11/4/2010 0.00
11/5/2010 0.00
11/6/2010 0.00
11/7/2010 0.00
11/8/2010
11/9/2010
11/10/2010 0.08
11/11/2010 0.05
11/12/2010 0.01
11/13/2010
11/14/2010 0.05
11/15/2010 0.08
11/16/2010
11/17/2010 0.25
11/18/2010 0.00
11/19/2010 0.00
11/20/2010 0.00
11/21/2010 0.00
11/22/2010 0.25
11/23/2010 0.00
11/24/2010 0.15
11/25/2010 0.00
11/26/2010
11/27/2010 0.00
11/28/2010 0.00
11/29/2010 0.10
11/30/2010 0.00
12/1/2010 T
12/2/2010 T
12/3/2010 0.00
12/4/2010 0.15
12/5/2010 T
12/6/2010 0.00
12/7/2010 0.22
12/8/2010
12/9/2010 0.00
12/10/2010 T
12/11/2010 0.22
12/12/2010 T
12/13/2010 T
12/14/2010 0.00
12/15/2010 0.00
12/16/2010 0.33
12/17/2010
12/18/2010 0.90
12/19/2010 0.23
12/20/2010 0.23
12/21/2010 0.36
12/22/2010 0.00
12/23/2010
12/24/2010 0.00
12/25/2010 0.00
12/26/2010 0.00
12/27/2010 0.10
12/28/2010
12/29/2010
12/30/2010 0.00
12/31/2010 0.20
Day of YearDaily PrcpMultiday Prcp
1/1/2011 0.05
1/2/2011 0.00
1/3/2011 0.09
1/4/2011
1/5/2011 0.00
1/6/2011
1/7/2011
1/8/2011 0.00
1/9/2011 0.26
1/10/2011 0.10
1/11/2011 0.00
1/12/2011 0.00
1/13/2011 0.00
1/14/2011
1/15/2011
1/16/2011 T
1/17/2011 T
1/18/2011
1/19/2011
1/20/2011 0.25
1/21/2011 0.10
1/22/2011
1/23/2011 0.21
1/24/2011 0.23
1/25/2011 0.00
1/26/2011
1/27/2011 0.10
1/28/2011 0.00
1/29/2011
1/30/2011 0.00
1/31/2011
2/1/2011 0.15
2/2/2011 0.05
2/3/2011 0.00
2/4/2011
2/5/2011 0.19
2/6/2011 0.28
2/7/2011 0.05
2/8/2011
2/9/2011 0.25
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
2/17/2011
2/18/2011 0.50
2/19/2011 0.00
2/20/2011 0.16
2/21/2011
2/22/2011
2/23/2011
2/24/2011 T
2/25/2011 0.10
2/26/2011 0.25
2/27/2011 0.05
2/28/2011
3/1/2011
3/2/2011
3/3/2011
3/4/2011
3/5/2011 0.28
3/6/2011 0.05
3/7/2011 0.05
3/8/2011 T
3/9/2011
3/10/2011
3/11/2011
3/12/2011 0.00
3/13/2011 0.25
3/14/2011 0.00
3/15/2011 0.18
3/16/2011 0.00
3/17/2011 T
3/18/2011 0.22
3/19/2011 0.00
3/20/2011
3/21/2011 0.00
3/22/2011 0.23
3/23/2011
3/24/2011 0.00
3/25/2011
3/26/2011 0.11
3/27/2011 0.15
3/28/2011 0.65
3/29/2011 0.27
3/30/2011
3/31/2011
Day of YearDaily PrcpMultiday Prcp
4/1/2011
4/2/2011 0.00
4/3/2011 T
4/4/2011 0.68
4/5/2011 0.00
4/6/2011
4/7/2011
4/8/2011 0.00
4/9/2011 0.00
4/10/2011 0.05
4/11/2011
4/12/2011
4/13/2011 0.00
4/14/2011 0.33
4/15/2011 0.00
4/16/2011 0.00
4/17/2011 0.00
4/18/2011
4/19/2011 0.41
4/20/2011 0.17
4/21/2011
4/22/2011
4/23/2011 0.20
4/24/2011 0.40
4/25/2011 0.22
4/26/2011 0.73
4/27/2011 0.71
4/28/2011
4/29/2011
4/30/2011 0.73
5/1/2011
5/2/2011
5/3/2011
5/4/2011
5/5/2011 0.00
5/6/2011
5/7/2011 0.00
5/8/2011
5/9/2011 0.00
5/10/2011
5/11/2011 0.46
5/12/2011 0.33
5/13/2011
5/14/2011
5/15/2011 0.14
5/16/2011
5/17/2011
5/18/2011
5/19/2011 0.20
5/20/2011 0.22
5/21/2011 0.37
5/22/2011 0.16
5/23/2011
5/24/2011
5/25/2011
5/26/2011
5/27/2011
5/28/2011
5/29/2011
5/30/2011
5/31/2011
6/1/2011
6/2/2011
6/3/2011
6/4/2011
6/5/2011
6/6/2011
6/7/2011
6/8/2011
6/9/2011
6/10/2011
6/11/2011
6/12/2011
6/13/2011
6/14/2011
6/15/2011
6/16/2011
6/17/2011
6/18/2011 0.10
6/19/2011 0.01
6/20/2011
6/21/2011 0.68
6/22/2011
6/23/2011
6/24/2011
6/25/2011
6/26/2011
6/27/2011
6/28/2011
6/29/2011
6/30/2011
Day of YearDaily PrcpMultiday Prcp
7/1/2011
7/2/2011
7/3/2011
7/4/2011
7/5/2011
7/6/2011 0.36
7/7/2011
7/8/2011
7/9/2011 0.16
7/10/2011
7/11/2011 0.36
7/12/2011 0.05
7/13/2011 0.46
7/14/2011
7/15/2011
7/16/2011
7/17/2011 0.02
7/18/2011
7/19/2011 0.92
7/20/2011 T
7/21/2011
7/22/2011
7/23/2011
7/24/2011
7/25/2011
7/26/2011
7/27/2011
7/28/2011
7/29/2011
7/30/2011
7/31/2011
8/1/2011
8/2/2011
8/3/2011
8/4/2011 0.10
8/5/2011 0.01
8/6/2011
8/7/2011
8/8/2011
8/9/2011
8/10/2011
8/11/2011
8/12/2011
8/13/2011
8/14/2011
8/15/2011
8/16/2011 0.20
8/17/2011
8/18/2011
8/19/2011
8/20/2011
8/21/2011
8/22/2011 0.05
8/23/2011
8/24/2011
8/25/2011
8/26/2011 0.20
8/27/2011 0.25
8/28/2011
8/29/2011 0.04
8/30/2011
8/31/2011
9/1/2011
9/2/2011
9/3/2011
9/4/2011
9/5/2011
9/6/2011
9/7/2011 0.42
9/8/2011
9/9/2011
9/10/2011
9/11/2011
9/12/2011
9/13/2011
9/14/2011
9/15/2011 0.25
9/16/2011
9/17/2011 0.12
9/18/2011 0.24
9/19/2011
9/20/2011
9/21/2011
9/22/2011
9/23/2011
9/24/2011
9/25/2011
9/26/2011
9/27/2011
9/28/2011
9/29/2011
9/30/2011



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/31/2010 7:00 AM 0.06 T M M M Precipitation started out as rain around 2000 hrs. on 10/30/10 and changed to snow over night.
11/1/2010 7:00 AM 0.10 1.5 M M M Snow started to fall around 12 am
11/2/2010 7:00 AM 0.00 0.0 M M M clear and cold night with no precipatation
11/3/2010 7:00 AM 0.00 0.0 M M M
11/4/2010 7:00 AM 0.00 0.0 M M M
11/5/2010 7:00 AM 0.00 0.0 M M M extremely clear with frost
11/6/2010 7:00 AM 0.00 0.0 M 0.0 M Only scattered snow left on the ground
11/7/2010 7:00 AM 0.00 0.0 M M M
11/10/2010 7:00 AM 0.08 1.5 M M M
11/11/2010 7:00 AM 0.05 1.1 M M M
11/12/2010 7:00 AM 0.01 0.5 M M M
11/14/2010 2:00 PM 0.05 1.0 M M M
11/15/2010 10:00 AM 0.08 2.5 M M M
11/17/2010 10:00 AM 0.25 5.3 M 7.0 M Wind blew so hard that snow stake may not be accurate. water measurement could also have been wind effected.
11/18/2010 7:00 AM 0.00 0.0 M 6.0 M
11/19/2010 7:00 AM 0.00 0.0 M 4.5 M
11/20/2010 7:00 AM 0.00 0.0 M 4.5 M
11/21/2010 7:00 AM 0.00 0.0 M 3.5 M
11/22/2010 7:00 AM 0.25 2.6 M 5.5 M Again lots of wind when the snow fell
11/23/2010 7:00 AM 0.00 0.0 M 5.5 M
11/24/2010 10:00 AM 0.15 2.5 M 6.5 M Snow came in with high winds at frontal passage.
11/25/2010 7:00 AM 0.00 0.0 M 6.0 M Low temperature of -17.5 this morning!
11/27/2010 7:00 AM 0.00 0.0 M 6.0 M Heavy surface hoar at site in the morning
11/28/2010 7:00 AM 0.00 0.0 M 6.0 M
11/29/2010 7:00 AM 0.10 1.5 M 7.0 M
11/30/2010 7:00 AM 0.00 0.0 0.00 7.0 M low temp of -9f this morning!
12/1/2010 7:00 AM T T T 7.0 M
12/2/2010 7:00 AM T T T 7.0 M
12/3/2010 7:00 AM 0.00 0.0 0.00 7.0 M
12/4/2010 7:00 AM 0.15 1.5 0.15 5.5 M
12/5/2010 7:00 AM T T T 5.5 M
12/6/2010 7:00 AM 0.00 0.0 0.00 5.5 M
12/7/2010 7:00 AM 0.22 3.5 M 7.5 M
12/9/2010 7:00 AM 0.00 0.0 0.00 7.0 M
12/10/2010 7:00 AM T T T 7.0 M Very light snow starting to fall. Beginning of the next La Nina snow for the mountains!
12/11/2010 7:00 AM 0.22 2.5 M 9.5 M Extreme wind for the 24 hr. period may have affected results.
12/12/2010 7:00 AM T T T 9.0 M
12/13/2010 7:00 AM T T T 9.0 M Heavy frost (surface hoar) this morning.
12/14/2010 7:00 AM 0.00 0.0 0.00 8.0 M mild night
12/15/2010 7:00 AM 0.00 0.0 0.00 7.5 M
12/16/2010 7:00 AM 0.33 6.5 M 13.5 M
12/18/2010 7:00 AM 0.90 2.5 M 12.0 M Very light snowfall with no wind
12/19/2010 8:00 AM 0.23 4.0 M 14.0 M
12/20/2010 7:00 AM 0.23 3.0 M 15.0 M Temperature remained above freezing all night
12/21/2010 7:00 AM 0.36 3.0 M 15.0 M temperatures were around freezing overnight
12/22/2010 7:00 AM 0.00 0.0 M 15.0 M moon was out
12/24/2010 7:00 AM 0.00 0.0 0.00 15.0 M
12/25/2010 7:00 AM 0.00 0.0 0.00 15.0 M
12/26/2010 7:00 AM 0.00 0.0 M 15.0 M
12/27/2010 7:00 AM 0.10 3.0 M 16.5 M
12/30/2010 7:00 AM 0.00 0.0 0.00 15.5 M
12/31/2010 7:00 AM 0.20 3.0 M 16.0 M
1/1/2011 7:00 AM 0.05 0.7 M 16.0 M low temp of -17.5 f at 2200 12.31.10
1/2/2011 7:00 AM 0.00 0.0 M 15.0 M
1/3/2011 7:00 AM 0.09 2.7 M 16.0 M
1/5/2011 7:00 AM 0.00 0.0 M 15.0 M
1/8/2011 7:00 AM 0.00 0.0 M 15.0 M
1/9/2011 7:00 AM 0.26 5.0 M 19.0 M Extremely light poweder
1/10/2011 7:00 AM 0.10 2.0 M 19.0 M
1/11/2011 7:00 AM 0.00 0.0 M 18.0 M
1/12/2011 7:00 AM 0.00 0.0 M 18.0 M
1/13/2011 7:00 AM 0.00 0.0 M 17.0 M
1/16/2011 7:00 AM T T T 17.0 M
1/17/2011 7:00 AM T T M 17.0 M
1/20/2011 7:00 AM 0.25 4.5 M 20.0 M
1/21/2011 7:00 AM 0.10 2.0 M 19.0 M
1/23/2011 7:00 AM 0.21 3.5 M 21.0 M
1/24/2011 7:00 AM 0.23 3.0 M 21.0 M
1/25/2011 7:00 AM 0.00 0.0 M 21.0 M
1/27/2011 7:00 AM 0.10 1.5 M 21.0 M
1/28/2011 7:00 AM 0.00 0.0 M 20.5 M
1/30/2011 7:00 AM 0.00 0.0 M 19.0 M
2/1/2011 7:00 AM 0.15 1.5 M 20.5 M
2/2/2011 7:00 AM 0.05 0.5 M 20.0 M -31 f this morning
2/3/2011 7:00 AM 0.00 0.0 M 20.0 M
2/5/2011 7:00 AM 0.19 4.5 M 24.0 M
2/6/2011 7:00 AM 0.28 5.0 M 27.0 M wind swept study plot so values could be a bit skewed.
2/7/2011 7:00 AM 0.05 1.0 M 26.0 M
2/9/2011 7:00 AM 0.25 4.0 M 26.0 M
2/10/2011 7:00 AM 0.00 0.0 M 26.0 M
2/11/2011 7:00 AM 0.00 0.0 M 26.0 M
2/12/2011 7:00 AM 0.00 0.0 M 26.0 M
2/13/2011 7:00 AM 0.00 0.0 M 25.0 M
2/14/2011 7:00 AM 0.00 0.0 M 24.5 M
2/18/2011 7:00 AM 0.50 5.0 M 26.0 M
2/19/2011 7:00 AM 0.00 0.0 M 25.0 M
2/20/2011 7:00 AM 0.16 2.5 M 26.0 M
2/24/2011 7:00 AM T T M 25.0 M
2/25/2011 7:00 AM 0.10 2.0 M 26.0 M
2/26/2011 7:00 AM 0.25 5.0 M 29.5 M
2/27/2011 7:00 AM 0.05 1.0 M 29.0 M
3/5/2011 7:00 AM 0.28 3.0 M 28.0 M Water eq. and new snow was from 2/28/11 until 3/4/11 as I was away at a conference and took reading on 3/5/11
3/6/2011 7:00 AM 0.05 1.0 M 28.0 M
3/7/2011 7:00 AM 0.05 1.0 M 28.0 M
3/8/2011 7:00 AM T T M 27.0 M
3/12/2011 7:00 AM 0.00 0.0 M 26.0 M
3/13/2011 7:00 AM 0.25 3.5 M 29.0 M
3/14/2011 7:00 AM 0.00 0.0 M 26.0 M
3/15/2011 7:00 AM 0.18 4.0 M 30.0 M
3/16/2011 7:00 AM 0.00 0.0 M 26.0 M
3/17/2011 7:00 AM T T M 26.0 M
3/18/2011 7:00 AM 0.22 4.5 M 29.0 M
3/19/2011 7:00 AM 0.00 0.0 M 27.0 M
3/21/2011 7:00 AM 0.00 0.0 M 25.0 M
3/22/2011 7:00 AM 0.23 2.3 M 27.0 M
3/24/2011 7:00 AM 0.00 0.0 M 26.0 M
3/26/2011 7:00 AM 0.11 1.5 M 27.0 M
3/27/2011 7:00 AM 0.15 3.0 M 28.0 M
3/28/2011 9:00 AM 0.65 10.5 M 35.0 M
3/29/2011 7:00 AM 0.27 4.0 M 37.0 M
4/2/2011 7:00 AM 0.00 0.0 M 32.0 M
4/3/2011 7:00 AM T T M 28.0 M
4/4/2011 7:00 AM 0.68 6.0 M 33.0 M
4/5/2011 7:00 AM 0.00 0.0 M 28.0 M
4/8/2011 7:00 AM 0.00 0.0 M 27.0 M
4/9/2011 7:00 AM 0.00 0.0 M 26.0 M
4/10/2011 7:00 AM 0.05 1.0 M 27.0 M
4/13/2011 7:00 AM 0.00 0.0 M 25.0 M Base stake is now part of a large snow patch in the yard. 25% of the yard has melted so measurement is in a slightly tree shaded area.
4/14/2011 7:00 AM 0.33 4.5 M 27.0 M
4/15/2011 7:00 AM 0.00 0.0 M 26.0 M
4/16/2011 7:00 AM 0.00 0.0 M 24.0 M
4/17/2011 7:00 AM 0.00 0.0 M 23.0 M Base stake is in a area of snow. However 2/3 of yard is free of snow.
4/19/2011 7:00 AM 0.41 M M 26.0 M (edit: new snow accumulation initially recorded as 40.0". changed to NA due to natural argument. P.G.)
4/20/2011 7:00 AM 0.17 3.0 M 24.0 M
4/23/2011 7:00 AM 0.20 2.0 M 22.0 M
4/24/2011 7:00 AM 0.40 4.5 M 22.0 M Base report is in a snow area. Not representative of true depth which vaties with location of 0 to 22 inches.
4/25/2011 7:00 AM 0.22 2.5 M 22.0 M Base stake in pillow of snow.
4/26/2011 7:00 AM 0.73 7.0 M 28.0 M
4/27/2011 7:00 AM 0.71 7.0 M 30.0 M
4/30/2011 7:00 AM 0.73 7.5 M 22.0 M snow stake is in snow rest of area is melted
5/5/2011 7:00 AM 0.00 0.0 M M M
5/7/2011 7:00 AM 0.00 0.0 M 0.0 M
5/9/2011 7:00 AM 0.00 0.0 M 0.0 M
5/11/2011 7:00 AM 0.46 4.5 M 6.0 M
5/12/2011 7:00 AM 0.33 4.0 M M M
5/15/2011 7:00 AM 0.14 M M M M
5/19/2011 7:00 AM 0.20 2.0 M M M
5/20/2011 7:00 AM 0.22 2.5 M 1.0 M
5/21/2011 7:00 AM 0.37 3.7 M 3.0 M
5/22/2011 7:00 AM 0.16 0.0 M 0.0 M
6/18/2011 7:00 AM 0.10 M M M M
6/19/2011 7:00 AM 0.01 M M M M
6/21/2011 7:00 AM 0.68 M M M M 2 day rain and snow total. new snow was 2" yesterday morning but melted into collection tube.
7/6/2011 7:00 AM 0.36 M M M M Clear morning with heavy t-storms and rain mid afternoon on.
7/9/2011 7:00 AM 0.16 M M M M
7/11/2011 7:00 AM 0.36 M M M M this is over the last 2 days.
7/12/2011 7:00 AM 0.05 M M M M
7/13/2011 7:00 AM 0.46 M M M M .36" in about 45 minutes between 8:30pm and 9:15 pm
7/17/2011 7:00 AM 0.02 M M M M
7/19/2011 7:00 AM 0.92 M M M M Intense ligthning storm accounted for most of the rainfall from 7:30 pm to 10pm
7/20/2011 7:00 AM T M M M M
8/4/2011 7:00 AM 0.10 M M M M
8/5/2011 7:00 AM 0.01 M M M M
8/16/2011 7:00 AM 0.20 M M M M
8/22/2011 7:00 AM 0.05 M M M M
8/26/2011 7:00 AM 0.20 M M M M
8/27/2011 7:00 AM 0.25 M M M M
8/29/2011 7:00 AM 0.04 M M M M
9/7/2011 7:00 AM 0.42 M M M M
9/15/2011 7:00 AM 0.25 M M M M
9/17/2011 7:00 AM 0.12 M M M M
9/18/2011 7:00 AM 0.24 M 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