Station Overview Station Location
Station Number CO-BO-8 Latitude 39.9925
Station Name Lafayette 0.4 WSW Longitude -105.1057
County Boulder Elevation (ft) 5285



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 17 1.12 2.09 31 2.09 31 0.00 0 0 8 0 3.7 4 2
Nov 17 0.95 0.33 30 0.33 30 0.00 0 0 6 1 2.8 2 2
Dec 17 0.70 0.32 31 0.32 31 0.00 0 0 4 4 5.3 6 8
Jan 18 0.49 0.60 31 0.60 31 0.00 0 0 5 1 6.9 3 12
Feb 18 0.47 0.70 28 0.70 28 0.00 0 0 11 3 16.4 10 12
March 18 1.56 1.76 27 1.76 27 0.00 0 0 4 1 6.8 3 2
April 18 2.01 0.90 22 0.90 22 0.00 0 0 7 0 3.0 5 2
May 18 2.25 2.86 31 2.86 31 0.00 0 0 12 2 0.0 0 0
June 18 1.88 0.80 30 0.80 30 0.00 0 0 5 7 0.0 0 0
July 18 1.54 2.02 31 2.02 31 0.00 0 0 9 5 0.0 0 0
Aug 18 1.65 2.04 31 2.04 31 0.00 0 0 4 4 0.0 0 0
Sept 18 1.40 0.70 29 0.70 29 0.00 0 0 4 2 0.0 0 0
Water Year Totals: 16.02" 15.12" 352 days 15.12" 352 0.00" 0 days 0 79 days 30 days 44.9" 33 days 40 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2017 0.01
10/2/2017 0.62
10/3/2017 0.52
10/4/2017 0.00
10/5/2017 0.00
10/6/2017 0.00
10/7/2017 0.00
10/8/2017 0.00
10/9/2017 0.50
10/10/2017 0.34
10/11/2017 0.00
10/12/2017 0.00
10/13/2017 0.00
10/14/2017 0.00
10/15/2017 0.00
10/16/2017 0.00
10/17/2017 0.00
10/18/2017 0.00
10/19/2017 0.00
10/20/2017 0.00
10/21/2017 0.00
10/22/2017 0.00
10/23/2017 0.00
10/24/2017 0.00
10/25/2017 0.00
10/26/2017 0.00
10/27/2017 0.06
10/28/2017 0.00
10/29/2017 0.00
10/30/2017 0.01
10/31/2017 0.03
11/1/2017 0.00
11/2/2017 0.00
11/3/2017 0.00
11/4/2017 0.00
11/5/2017 0.01
11/6/2017 0.00
11/7/2017 0.19
11/8/2017 0.06
11/9/2017 0.00
11/10/2017 0.00
11/11/2017 0.00
11/12/2017 0.00
11/13/2017 0.00
11/14/2017 0.00
11/15/2017 0.00
11/16/2017 0.00
11/17/2017 0.00
11/18/2017 0.04
11/19/2017 0.00
11/20/2017 0.00
11/21/2017 0.00
11/22/2017 0.01
11/23/2017 0.00
11/24/2017 0.00
11/25/2017 T
11/26/2017 0.00
11/27/2017 0.00
11/28/2017 0.02
11/29/2017 0.00
11/30/2017 0.00
12/1/2017 0.00
12/2/2017 0.00
12/3/2017 0.00
12/4/2017 0.00
12/5/2017 0.00
12/6/2017 0.00
12/7/2017 0.00
12/8/2017 0.00
12/9/2017 0.00
12/10/2017 0.00
12/11/2017 0.00
12/12/2017 0.00
12/13/2017 0.00
12/14/2017 0.04
12/15/2017 0.00
12/16/2017 0.00
12/17/2017 0.00
12/18/2017 0.00
12/19/2017 0.00
12/20/2017 0.00
12/21/2017 0.07
12/22/2017 0.02
12/23/2017 0.00
12/24/2017 0.19
12/25/2017 0.00
12/26/2017 T
12/27/2017 T
12/28/2017 0.00
12/29/2017 0.00
12/30/2017 T
12/31/2017 T
Day of YearDaily PrcpMultiday Prcp
1/1/2018 T
1/2/2018 0.00
1/3/2018 0.00
1/4/2018 0.00
1/5/2018 0.00
1/6/2018 0.00
1/7/2018 0.00
1/8/2018 0.00
1/9/2018 0.00
1/10/2018 0.00
1/11/2018 0.02
1/12/2018 0.00
1/13/2018 0.00
1/14/2018 0.00
1/15/2018 0.02
1/16/2018 0.03
1/17/2018 0.00
1/18/2018 0.00
1/19/2018 0.00
1/20/2018 0.00
1/21/2018 0.30
1/22/2018 0.23
1/23/2018 0.00
1/24/2018 0.00
1/25/2018 0.00
1/26/2018 0.00
1/27/2018 0.00
1/28/2018 0.00
1/29/2018 0.00
1/30/2018 0.00
1/31/2018 0.00
2/1/2018 0.01
2/2/2018 0.02
2/3/2018 0.00
2/4/2018 0.01
2/5/2018 0.01
2/6/2018 T
2/7/2018 0.00
2/8/2018 0.00
2/9/2018 0.00
2/10/2018 0.05
2/11/2018 0.10
2/12/2018 T
2/13/2018 T
2/14/2018 0.00
2/15/2018 0.00
2/16/2018 0.02
2/17/2018 0.00
2/18/2018 0.00
2/19/2018 0.02
2/20/2018 0.42
2/21/2018 0.00
2/22/2018 0.00
2/23/2018 0.01
2/24/2018 0.03
2/25/2018 0.00
2/26/2018 0.00
2/27/2018 0.00
2/28/2018 0.00
3/1/2018 0.00
3/2/2018 0.00
3/3/2018 0.00
3/4/2018 0.00
3/5/2018 0.00
3/6/2018 0.00
3/7/2018 0.00
3/8/2018 0.00
3/9/2018 0.00
3/10/2018 0.00
3/11/2018 0.00
3/12/2018 0.00
3/13/2018 0.00
3/14/2018 0.00
3/15/2018 0.00
3/16/2018 0.27
3/17/2018 0.00
3/18/2018 0.00
3/19/2018 0.76
3/20/2018 0.00
3/21/2018 0.00
3/22/2018 0.00
3/23/2018 0.00
3/24/2018 T
3/25/2018 0.00
3/26/2018 0.03
3/27/2018 0.70
3/28/2018
3/29/2018
3/30/2018
3/31/2018
Day of YearDaily PrcpMultiday Prcp
4/1/2018
4/2/2018
4/3/2018
4/4/2018
4/5/2018
4/6/2018
4/7/2018
4/8/2018
4/9/2018 0.02
4/10/2018 0.04
4/11/2018 0.00
4/12/2018 0.00
4/13/2018 0.01
4/14/2018 0.00
4/15/2018 0.00
4/16/2018 0.00
4/17/2018 0.00
4/18/2018 0.00
4/19/2018 0.00
4/20/2018 0.00
4/21/2018 0.44
4/22/2018 0.02
4/23/2018 0.00
4/24/2018 0.19
4/25/2018 0.18
4/26/2018 0.00
4/27/2018 0.00
4/28/2018 0.00
4/29/2018 0.00
4/30/2018 0.00
5/1/2018 0.01
5/2/2018 0.00
5/3/2018 0.94
5/4/2018 0.49
5/5/2018 0.00
5/6/2018 T
5/7/2018 0.00
5/8/2018 0.00
5/9/2018 0.00
5/10/2018 0.00
5/11/2018 0.00
5/12/2018 0.08
5/13/2018 0.48
5/14/2018 0.32
5/15/2018 0.08
5/16/2018 0.00
5/17/2018 0.00
5/18/2018 0.00
5/19/2018 0.04
5/20/2018 0.09
5/21/2018 0.05
5/22/2018 0.00
5/23/2018 0.18
5/24/2018 0.00
5/25/2018 0.00
5/26/2018 0.00
5/27/2018 0.00
5/28/2018 0.00
5/29/2018 0.10
5/30/2018 0.00
5/31/2018 T
6/1/2018 0.00
6/2/2018 0.00
6/3/2018 0.00
6/4/2018 0.00
6/5/2018 0.00
6/6/2018 T
6/7/2018 T
6/8/2018 0.00
6/9/2018 0.00
6/10/2018 0.00
6/11/2018 0.00
6/12/2018 0.00
6/13/2018 0.00
6/14/2018 0.00
6/15/2018 0.00
6/16/2018 T
6/17/2018 T
6/18/2018 0.25
6/19/2018 0.52
6/20/2018 T
6/21/2018 0.00
6/22/2018 0.01
6/23/2018 0.01
6/24/2018 T
6/25/2018 0.01
6/26/2018 0.00
6/27/2018 0.00
6/28/2018 T
6/29/2018 0.00
6/30/2018 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2018 T
7/2/2018 0.00
7/3/2018 0.00
7/4/2018 T
7/5/2018 T
7/6/2018 T
7/7/2018 0.00
7/8/2018 0.00
7/9/2018 0.00
7/10/2018 0.00
7/11/2018 0.00
7/12/2018 0.00
7/13/2018 T
7/14/2018 0.00
7/15/2018 0.00
7/16/2018 0.25
7/17/2018 0.00
7/18/2018 0.05
7/19/2018 0.00
7/20/2018 0.00
7/21/2018 0.00
7/22/2018 0.02
7/23/2018 0.09
7/24/2018 0.92
7/25/2018 0.00
7/26/2018 0.51
7/27/2018 0.11
7/28/2018 0.04
7/29/2018 0.03
7/30/2018 0.00
7/31/2018 0.00
8/1/2018 0.00
8/2/2018 0.00
8/3/2018 0.00
8/4/2018 0.05
8/5/2018 T
8/6/2018 0.01
8/7/2018 0.00
8/8/2018 0.00
8/9/2018 0.00
8/10/2018 0.00
8/11/2018 0.00
8/12/2018 0.00
8/13/2018 0.00
8/14/2018 0.00
8/15/2018 0.42
8/16/2018 0.00
8/17/2018 0.00
8/18/2018 0.00
8/19/2018 1.56
8/20/2018 0.00
8/21/2018 T
8/22/2018 T
8/23/2018 0.00
8/24/2018 0.00
8/25/2018 0.00
8/26/2018 0.00
8/27/2018 T
8/28/2018 0.00
8/29/2018 0.00
8/30/2018 0.00
8/31/2018 0.00
9/1/2018 T
9/2/2018 0.00
9/3/2018 0.00
9/4/2018 0.00
9/5/2018 0.60
9/6/2018 0.06
9/7/2018 0.02
9/8/2018 0.00
9/9/2018 0.00
9/10/2018 0.00
9/11/2018 0.00
9/12/2018 T
9/13/2018 0.00
9/14/2018 0.00
9/15/2018 0.00
9/16/2018 0.00
9/17/2018 0.00
9/18/2018 0.00
9/19/2018 0.00
9/20/2018 0.02
9/21/2018 0.00
9/22/2018 0.00
9/23/2018 0.00
9/24/2018 0.00
9/25/2018 0.00
9/26/2018 0.00
9/27/2018 0.00
9/28/2018 0.00
9/29/2018
9/30/2018 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2017 7:00 AM 0.01 0.0 M 0.0 M late aftn rain shower
10/2/2017 5:30 AM 0.62 0.0 M 0.0 M Brief TRW- mid-aftn (.01). Rather steady rain began around 8 pm. (note 0530 measurement)
10/3/2017 7:00 AM 0.52 T M 0.0 M Rain much of day, ended mid-evening. Brief R-S- just before 5 pm.
10/4/2017 7:00 AM 0.00 0.0 M 0.0 M roof/car frost
10/5/2017 7:00 AM 0.00 0.0 M 0.0 M
10/6/2017 7:00 AM 0.00 0.0 M 0.0 M
10/7/2017 7:00 AM 0.00 0.0 M 0.0 M
10/8/2017 7:00 AM 0.00 0.0 M 0.0 M
10/9/2017 7:00 AM 0.50 2.5 M 2.5 M FROPA late afternoon with strong N wind and quick temp drop. Rain developed evening, changed to snow before sunrise.
10/10/2017 7:00 AM 0.34 0.5 M 0.5 M snow ended by aftn with some melting/no accum; bare areas on grass at obs time
10/11/2017 7:00 AM 0.00 0.0 M T M
10/12/2017 7:00 AM 0.00 0.0 M 0.0 M
10/13/2017 7:00 AM 0.00 0.0 M 0.0 M
10/14/2017 7:00 AM 0.00 0.0 M 0.0 M
10/15/2017 7:00 AM 0.00 0.0 M 0.0 M quite windy & cooler afternoon
10/16/2017 7:00 AM 0.00 0.0 M 0.0 M
10/17/2017 7:00 AM 0.00 0.0 M 0.0 M
10/18/2017 7:00 AM 0.00 0.0 M 0.0 M
10/19/2017 7:00 AM 0.00 0.0 M 0.0 M
10/20/2017 7:00 AM 0.00 0.0 M 0.0 M
10/21/2017 7:00 AM 0.00 0.0 M 0.0 M
10/22/2017 7:00 AM 0.00 0.0 M 0.0 M
10/23/2017 7:00 AM 0.00 0.0 M 0.0 M breezy and mild (near 60F) all night
10/24/2017 7:00 AM 0.00 0.0 M 0.0 M
10/25/2017 7:00 AM 0.00 0.0 M 0.0 M
10/26/2017 7:00 AM 0.00 0.0 M 0.0 M 84F max - matches today's record high in Denver
10/27/2017 7:00 AM 0.06 0.5 M T M Some L-/S-- early aftn, picked up to S- for awhile. Cleared by early am.
10/28/2017 7:00 AM 0.00 0.0 M 0.0 M
10/29/2017 7:00 AM 0.00 0.0 M 0.0 M
10/30/2017 5:30 AM 0.01 0.0 M 0.0 M L-/ZL- began around midnight
10/31/2017 7:00 AM 0.03 0.2 M T M L-/ZL- am, then SWU early hours of Tuesday
11/1/2017 7:00 AM 0.00 0.0 M 0.0 M
11/2/2017 7:00 AM 0.00 0.0 M 0.0 M
11/3/2017 7:00 AM 0.00 0.0 M 0.0 M
11/4/2017 7:00 AM 0.00 0.0 M 0.0 M
11/5/2017 7:00 AM 0.01 0.0 M 0.0 M light rain before sunrise; some fog at obs time
11/6/2017 7:00 AM 0.00 0.0 M 0.0 M partly sunny mid-day through afternoon
11/7/2017 5:30 AM 0.19 2.0 M 2.0 M drizzle ended late am, then rain started late pm, turned to snow around midnight
11/8/2017 7:00 AM 0.06 0.8 M 2.0 M S-- continued through morning, no additional accum. S- evening, with brief coverage of roadways.
11/9/2017 7:00 AM 0.00 0.0 M T M
11/10/2017 7:00 AM 0.00 0.0 M T M
11/11/2017 7:00 AM 0.00 0.0 M 0.0 M
11/12/2017 7:00 AM 0.00 0.0 M 0.0 M
11/13/2017 7:00 AM 0.00 0.0 M 0.0 M
11/14/2017 7:00 AM 0.00 0.0 M 0.0 M
11/15/2017 7:00 AM 0.00 0.0 M 0.0 M
11/16/2017 7:00 AM 0.00 0.0 M 0.0 M
11/17/2017 7:00 AM 0.00 0.0 M 0.0 M
11/18/2017 7:00 AM 0.04 0.0 M 0.0 M strong winds late aftn, followed by light rain
11/19/2017 7:00 AM 0.00 0.0 M 0.0 M clear, light breeze
11/20/2017 7:00 AM 0.00 0.0 M 0.0 M
11/21/2017 7:00 AM 0.00 0.0 M 0.0 M
11/22/2017 7:00 AM 0.01 0.0 M 0.0 M ovc and windy with light rain mid-morning; cleared at sunset
11/23/2017 7:00 AM 0.00 0.0 M 0.0 M
11/24/2017 7:00 AM 0.00 0.0 M 0.0 M
11/25/2017 7:00 AM T 0.0 M 0.0 M Third day in a row with max 70F+. A few drops in mid-aftn shower.
11/26/2017 7:00 AM 0.00 0.0 M 0.0 M
11/27/2017 7:00 AM 0.00 0.0 M 0.0 M
11/28/2017 5:30 AM 0.02 0.0 M 0.0 M record warm, followed by FROPA ca 2315 with brief strong gusts, then a brief rain shower before dawn
11/29/2017 7:00 AM 0.00 0.0 M 0.0 M
11/30/2017 7:00 AM 0.00 0.0 M 0.0 M
12/1/2017 7:00 AM 0.00 0.0 M 0.0 M
12/2/2017 7:00 AM 0.00 0.0 M 0.0 M
12/3/2017 7:00 AM 0.00 0.0 M 0.0 M
12/4/2017 7:00 AM 0.00 0.0 M 0.0 M
12/5/2017 7:00 AM 0.00 0.0 M 0.0 M
12/6/2017 7:00 AM 0.00 0.0 M 0.0 M
12/7/2017 7:00 AM 0.00 0.0 M 0.0 M
12/8/2017 7:00 AM 0.00 0.0 M 0.0 M
12/9/2017 7:00 AM 0.00 0.0 M 0.0 M
12/10/2017 7:00 AM 0.00 0.0 M 0.0 M
12/11/2017 7:00 AM 0.00 0.0 M 0.0 M
12/12/2017 7:00 AM 0.00 0.0 M 0.0 M
12/13/2017 7:00 AM 0.00 0.0 M 0.0 M another warm and sunny day
12/14/2017 7:00 AM 0.04 0.9 M 1.0 M light snow began just before midnight, ended and sky cleared before dawn
12/15/2017 7:00 AM 0.00 0.0 M T M
12/16/2017 7:00 AM 0.00 0.0 M 0.0 M
12/17/2017 7:00 AM 0.00 0.0 M 0.0 M
12/18/2017 7:00 AM 0.00 0.0 M 0.0 M
12/19/2017 7:00 AM 0.00 0.0 M 0.0 M
12/20/2017 7:00 AM 0.00 0.0 M 0.0 M
12/21/2017 7:30 AM 0.07 0.9 M 1.0 M after 66F sunny & breezy max, clouded over after midnight, then light snow began before sunrise
12/22/2017 7:00 AM 0.02 0.5 M 1.0 M no accum after about noon; cleared by midnight
12/23/2017 7:00 AM 0.00 0.0 M T M
12/24/2017 7:00 AM 0.19 2.7 M 2.5 M
12/25/2017 7:00 AM 0.00 0.0 M 2.5 M
12/26/2017 7:00 AM T T M 2.5 M very light snow started before dawn
12/27/2017 7:00 AM T 0.2 M 3.0 M light snow - no accum after mid-aftn
12/28/2017 7:00 AM 0.00 0.0 M 0.5 M warmed quickly mid morning from 4F min to 55F max
12/29/2017 7:00 AM 0.00 0.0 M T M Topsy-turvy day: in 40s all night with 48F max 0530 28th, then dropped into 30s by noon w/26F min 2030. Back into 50s by 05L.
12/30/2017 7:00 AM T T M T M very light snow falling at 02L (no evidence on surfaces), continued past obs time - a dusting
12/31/2017 7:00 AM T 0.1 M T M Light snow continued until 1030L, then cleared. A few stray flakes before sunrise.
1/1/2018 7:00 AM T T M T M very light snow off and on all day and through evening
1/2/2018 7:00 AM 0.00 0.0 M T M
1/3/2018 7:00 AM 0.00 0.0 M T M cloud-free
1/4/2018 7:00 AM 0.00 0.0 M T M
1/5/2018 7:00 AM 0.00 0.0 M T M
1/6/2018 7:00 AM 0.00 0.0 M T M
1/7/2018 7:00 AM 0.00 0.0 M 0.0 M
1/8/2018 7:00 AM 0.00 0.0 M 0.0 M
1/9/2018 7:00 AM 0.00 0.0 M 0.0 M
1/10/2018 7:00 AM 0.00 0.0 M 0.0 M
1/11/2018 7:00 AM 0.02 T M T M R- mid aftn, then RW-/SPW- early eve
1/12/2018 7:00 AM 0.00 0.0 M 0.0 M
1/13/2018 7:00 AM 0.00 0.0 M 0.0 M brief dense fog before sunrise
1/14/2018 7:00 AM 0.00 0.0 M 0.0 M
1/15/2018 7:00 AM 0.02 T M T M ZL-/SG- began before sunrise
1/16/2018 7:00 AM 0.03 1.2 M 1.0 M ZL-/SG- gave way to S- around 0730, continued very light and fluffy until mid-aftn with temps near 20F
1/17/2018 7:00 AM 0.00 0.0 M 0.5 M
1/18/2018 7:00 AM 0.00 0.0 M T M
1/19/2018 7:00 AM 0.00 0.0 M 0.0 M mo cldy, 64F max
1/20/2018 7:00 AM 0.00 0.0 M 0.0 M 69F max
1/21/2018 7:00 AM 0.30 3.4 M 3.5 M became ovc before sunset, precip started with L-/ZL-, add some snowflakes late evening, changed to snow around 00L
1/22/2018 7:00 AM 0.23 2.3 M 5.5 M snow tapered off mid-day
1/23/2018 7:00 AM 0.00 0.0 M 4.0 M
1/24/2018 7:00 AM 0.00 0.0 M 3.5 M
1/25/2018 7:00 AM 0.00 0.0 M 3.0 M
1/26/2018 7:00 AM 0.00 0.0 M 2.5 M
1/27/2018 7:00 AM 0.00 0.0 M 2.0 M
1/28/2018 7:00 AM 0.00 0.0 M 1.5 M
1/29/2018 7:00 AM 0.00 0.0 M 1.0 M
1/30/2018 7:00 AM 0.00 0.0 M 0.5 M
1/31/2018 7:00 AM 0.00 0.0 M T M
2/1/2018 7:00 AM 0.01 0.2 M T M very light snow began late evening, continued all night
2/2/2018 7:00 AM 0.02 0.3 M T M light snow morning, no accum after noon
2/3/2018 7:00 AM 0.00 0.0 M T M
2/4/2018 7:00 AM 0.01 T M T M FROPA ca 0330L. ZL- then S--.
2/5/2018 7:00 AM 0.01 0.1 M T M light snow through mid-morning
2/6/2018 7:00 AM T T M 0.0 M a brief shower with rare winter/west rainbow at sunrise; a few evening flakes
2/7/2018 7:00 AM 0.00 0.0 M 0.0 M
2/8/2018 7:00 AM 0.00 0.0 M 0.0 M
2/9/2018 7:00 AM 0.00 0.0 M 0.0 M temp dropped from 45 to 25 between 0300 and 0600
2/10/2018 7:00 AM 0.05 1.0 M 1.0 M ZL-/SG-- 07-09L T/T; S- began late aftn - little accum after 0130
2/11/2018 7:00 AM 0.10 1.4 M 2.0 M Temp high teens during day. Snow tapered off, w/little accum after noon; mo clear by late evening. AM min 6F.
2/12/2018 7:00 AM T T M T M very light snow started around sunrise
2/13/2018 7:00 AM T T M T M very light snow until early aftn
2/14/2018 7:00 AM 0.00 0.0 M 0.0 M windy and sunny
2/15/2018 7:00 AM 0.00 0.0 M 0.0 M windy - very mild
2/16/2018 7:00 AM 0.02 0.4 M 0.5 M
2/17/2018 7:00 AM 0.00 0.0 M T M quite windy evening
2/18/2018 7:00 AM 0.00 0.0 M 0.0 M
2/19/2018 7:00 AM 0.02 1.5 M 1.5 M sunny and warm Sunday, became ovc mid-eve with ZL-- and an occasional snowflake. S- began before dawn.
2/20/2018 7:00 AM 0.42 10.8 M 7.5 M periods of heavy snow (2.8" in an hour early aftn, 4.6" between 1700 and 2130); snow ended well before dawn with partial clearing before sunrise
2/21/2018 7:00 AM 0.00 0.0 M 5.0 M
2/22/2018 7:00 AM 0.00 0.0 M 5.0 M
2/23/2018 7:00 AM 0.01 0.4 M 4.0 M a few flakes mid-morning, S- for a couple hours mid-eve
2/24/2018 7:00 AM 0.03 0.3 M 3.5 M light snow late aftn through evening
2/25/2018 7:00 AM 0.00 0.0 M 3.0 M
2/26/2018 7:00 AM 0.00 0.0 M 2.5 M
2/27/2018 7:00 AM 0.00 0.0 M 1.5 M
2/28/2018 7:00 AM 0.00 0.0 M T M
3/1/2018 7:00 AM 0.00 0.0 M T M
3/2/2018 7:00 AM 0.00 0.0 M T M
3/3/2018 7:00 AM 0.00 0.0 M T M
3/4/2018 7:00 AM 0.00 0.0 M T M
3/5/2018 7:00 AM 0.00 0.0 M 0.0 M
3/6/2018 7:00 AM 0.00 0.0 M 0.0 M
3/7/2018 7:00 AM 0.00 0.0 M 0.0 M
3/8/2018 7:00 AM 0.00 0.0 M 0.0 M
3/9/2018 7:00 AM 0.00 0.0 M 0.0 M
3/10/2018 7:00 AM 0.00 0.0 M 0.0 M
3/11/2018 7:00 AM 0.00 0.0 M 0.0 M
3/12/2018 7:00 AM 0.00 0.0 M 0.0 M
3/13/2018 7:00 AM 0.00 0.0 M 0.0 M
3/14/2018 7:00 AM 0.00 0.0 M 0.0 M
3/15/2018 7:00 AM 0.00 0.0 M 0.0 M
3/16/2018 7:00 AM 0.27 0.2 M T M a very few drops at 18L; accumulating graupel/small hail fell for 20 min beginning 20L, rain continued about another hour
3/17/2018 7:00 AM 0.00 0.0 M 0.0 M
3/18/2018 7:00 AM 0.00 0.0 M 0.0 M
3/19/2018 7:00 AM 0.76 3.3 M 2.5 M A couple of nearby lightning strikes near the beginning of the precip, which started as sleet/snow pellets, then changed to S ("massive" flakes) around 1730 for a while. Snow briefly covered pavement, but mostly melted by 2130, as temp was at 34F. Only 0.4"/.03" accum after 2230. Partial clearing well before sunrise.
3/20/2018 7:00 AM 0.00 0.0 M T M
3/21/2018 7:00 AM 0.00 0.0 M T M
3/22/2018 7:00 AM 0.00 0.0 M 0.0 M mo cldy
3/23/2018 7:00 AM 0.00 0.0 M 0.0 M
3/24/2018 7:00 AM T 0.0 M 0.0 M sunny, then ovc and quite windy 1035ff with a few drops of rain, then sunny again with off and on wind
3/25/2018 7:00 AM 0.00 0.0 M 0.0 M became ovc mid-aftn, with some gusty winds eve; sunny by dawn
3/26/2018 7:00 AM 0.03 0.0 M 0.0 M late evening shower and then some drizzle near sunrise
3/27/2018 7:00 AM 0.70 3.3 M 3.0 M Steady rain began around 6 pm (.21"), changed to snow about 6:45. Sky mostly cleared by sunrise.
4/9/2018 7:00 AM 0.02 0.0 M 0.0 M a few showers near midnight
4/10/2018 7:00 AM 0.04 0.1 M 0.0 M light rain and snow early am
4/11/2018 7:00 AM 0.00 0.0 M 0.0 M
4/12/2018 7:00 AM 0.00 0.0 M 0.0 M
4/13/2018 7:00 AM 0.01 0.0 M 0.0 M
4/14/2018 7:00 AM 0.00 0.0 M 0.0 M
4/15/2018 7:00 AM 0.00 0.0 M 0.0 M
4/16/2018 7:00 AM 0.00 0.0 M 0.0 M
4/17/2018 7:00 AM 0.00 0.0 M 0.0 M
4/18/2018 7:00 AM 0.00 0.0 M 0.0 M
4/19/2018 7:00 AM 0.00 0.0 M 0.0 M
4/20/2018 7:00 AM 0.00 0.0 M 0.0 M
4/21/2018 7:00 AM 0.44 2.2 M 2.0 M brief am graupel shower; ovc by late morning; RW-- mid-day, RW- mid-late aftn .01"; R-S- mid-eve, then S- before midnight. Mostly stopped after 1 am (1.7"), then light snow again began before sunrise.
4/22/2018 7:00 AM 0.02 0.1 M T M light snow/light rain through early aftn
4/23/2018 7:00 AM 0.00 0.0 M 0.0 M
4/24/2018 5:30 AM 0.19 0.4 M 0.5 M Thunder heard mid aftn, and a very light thundershower early eve (T). R- after midnight, with R-S-/S- later.
4/25/2018 7:00 AM 0.18 0.2 M 0.0 M
4/26/2018 7:00 AM 0.00 0.0 M 0.0 M
4/27/2018 7:00 AM 0.00 0.0 M 0.0 M
4/28/2018 7:00 AM 0.00 0.0 M 0.0 M
4/29/2018 7:00 AM 0.00 0.0 M 0.0 M
4/30/2018 7:00 AM 0.00 0.0 M 0.0 M
5/1/2018 7:00 AM 0.01 0.0 M 0.0 M RWU near midnight; L- before sunrise
5/2/2018 7:00 AM 0.00 0.0 M 0.0 M
5/3/2018 7:00 AM 0.94 0.0 M 0.0 M light rain am, with .15" by early aftn; rain early evening +.20"; moderate rain mo after midnight +.59"
5/4/2018 7:00 AM 0.49 0.0 M 0.0 M light rain continued into early aftn, a quick moderate shower mid-aftn, then cleared before sunset. 33h total 1.43"
5/5/2018 7:00 AM 0.00 0.0 M 0.0 M
5/6/2018 7:00 AM T 0.0 M 0.0 M "Several" afternoon drops from a mostly sunny sky.
5/7/2018 7:00 AM 0.00 0.0 M 0.0 M
5/8/2018 7:00 AM 0.00 0.0 M 0.0 M
5/9/2018 7:00 AM 0.00 0.0 M 0.0 M
5/10/2018 7:00 AM 0.00 0.0 M 0.0 M
5/11/2018 7:00 AM 0.00 0.0 M 0.0 M
5/12/2018 7:00 AM 0.08 0.0 M 0.0 M L-/L/R- during night; light fog at sunrise
5/13/2018 7:00 AM 0.48 0.0 M 0.0 M light rain & drizzle am, dried aftn, then TRW-/A3/8" early evening, and some more light rain & drizzle over night with 1/4F at sunrise
5/14/2018 7:00 AM 0.32 0.0 M 0.0 M Generally dry until mid-evening. Main event was a thunderstorm with near-continuous lightning that mostly passed west and north of us. We did get some small hail (largest 1/4") and a quarter inch of rain. RWU and L- continued until sunrise.
5/15/2018 7:00 AM 0.08 0.0 M 0.0 M TRW- early evening
5/16/2018 7:00 AM 0.00 0.0 M 0.0 M
5/17/2018 7:00 AM 0.00 0.0 M 0.0 M
5/18/2018 7:00 AM 0.00 0.0 M 0.0 M
5/19/2018 7:00 AM 0.04 0.0 M 0.0 M TRW+ west mid afternoon. Lots of thunder, but only .02" here. TRW- continued into early evening, then some partial clearing before bedtime. Drizzle at sunrise.
5/20/2018 7:00 AM 0.09 0.0 M 0.0 M RW- am, some partial clearing early aftn, RW- pm .05". R- after ca 02L +.04"
5/21/2018 7:00 AM 0.05 0.0 M 0.0 M RWU late aftn/early eve
5/22/2018 7:00 AM 0.00 0.0 M 0.0 M
5/23/2018 7:00 AM 0.18 0.0 M 0.0 M TRW blew up south late aftn. Moved straight north, core passed just to our east. Had a few hailstones up to 3/8". Caught the east edge of an early-evening TRW that came off the foothills over Boulder. (T)
5/24/2018 7:00 AM 0.00 0.0 M 0.0 M
5/25/2018 7:00 AM 0.00 0.0 M 0.0 M
5/26/2018 7:00 AM 0.00 0.0 M 0.0 M
5/27/2018 7:00 AM 0.00 0.0 M 0.0 M
5/28/2018 7:00 AM 0.00 0.0 M 0.0 M
5/29/2018 7:00 AM 0.10 0.0 M 0.0 M storms approached from SW mid aftn; thunder 1601
5/30/2018 7:00 AM 0.00 0.0 M 0.0 M
5/31/2018 7:00 AM T 0.0 M 0.0 M thunder SW early eve, then some quite light rain
6/1/2018 7:00 AM 0.00 0.0 M 0.0 M
6/2/2018 7:00 AM 0.00 0.0 M 0.0 M
6/3/2018 7:00 AM 0.00 0.0 M 0.0 M
6/4/2018 7:00 AM 0.00 0.0 M 0.0 M
6/5/2018 7:00 AM 0.00 0.0 M 0.0 M
6/6/2018 7:00 AM T 0.0 M 0.0 M a few mid-evening drops
6/7/2018 7:00 AM T 0.0 M 0.0 M Very light rain in a gusty evening thunderstorm. Good collection of twigs down.
6/8/2018 7:00 AM 0.00 0.0 M 0.0 M
6/9/2018 7:00 AM 0.00 0.0 M 0.0 M strong gusty winds from high-based virga cloud mid-aftn
6/10/2018 7:00 AM 0.00 0.0 M 0.0 M smoky red sun at sunrise
6/11/2018 7:00 AM 0.00 0.0 M 0.0 M
6/12/2018 7:00 AM 0.00 0.0 M 0.0 M
6/13/2018 7:00 AM 0.00 0.0 M 0.0 M
6/14/2018 7:00 AM 0.00 0.0 M 0.0 M
6/15/2018 7:00 AM 0.00 0.0 M 0.0 M
6/16/2018 7:00 AM T 0.0 M 0.0 M a very light mid-day shower
6/17/2018 7:00 AM T 0.0 M 0.0 M A very few drops early aftn. Showers passed to west (good period of continual thunder) and east during afternoon.
6/18/2018 7:00 AM 0.25 0.0 M 0.0 M several showers with breaks, but overcast after mid-day
6/19/2018 7:00 AM 0.52 0.0 M 0.0 M Some morning L-RW- (.03"), then mostly dry until evening. TRW- ca 18L. TRW- with A up to 1.5" 1938-1951L, .19". TRW with a few A 3/8" 1920-1945 .21". Partial clearing (Moon and Venus visible) late evening, then some RW- before dawn .05".
6/20/2018 7:00 AM T 0.0 M 0.0 M
6/21/2018 7:00 AM 0.00 0.0 M 0.0 M
6/22/2018 7:00 AM 0.01 0.0 M 0.0 M light late-aftn shower
6/23/2018 7:00 AM 0.01 0.0 M 0.0 M gusty morning shower - more wind than rain
6/24/2018 7:00 AM T 0.0 M 0.0 M very light shower just before sunrise
6/25/2018 7:00 AM 0.01 0.0 M 0.0 M early aftn TRW-
6/26/2018 7:00 AM 0.00 0.0 M 0.0 M
6/27/2018 7:00 AM 0.00 0.0 M 0.0 M
6/28/2018 7:00 AM T 0.0 M 0.0 M some gusty winds late aftn; a very light mid-evening shower
6/29/2018 7:00 AM 0.00 0.0 M 0.0 M
6/30/2018 7:00 AM 0.00 0.0 M 0.0 M
7/1/2018 7:00 AM T 0.0 M 0.0 M a couple of very light and very brief afternoon showers
7/2/2018 7:00 AM 0.00 0.0 M 0.0 M
7/3/2018 7:00 AM 0.00 0.0 M 0.0 M a period of strong winds late evening
7/4/2018 7:00 AM T 0.0 M 0.0 M a couple of drops with a gusty dry storm mid-aftn
7/5/2018 7:00 AM T 0.0 M 0.0 M two light showers around sunset
7/6/2018 7:00 AM T 0.0 M 0.0 M very light afternoon thundershowers
7/7/2018 7:00 AM 0.00 0.0 M 0.0 M
7/8/2018 7:00 AM 0.00 0.0 M 0.0 M
7/9/2018 7:00 AM 0.00 0.0 M 0.0 M
7/10/2018 7:00 AM 0.00 0.0 M 0.0 M
7/11/2018 7:00 AM 0.00 0.0 M 0.0 M
7/12/2018 7:00 AM 0.00 0.0 M 0.0 M
7/13/2018 7:00 AM T 0.0 M 0.0 M a very light early-aftn shower
7/14/2018 7:00 AM 0.00 0.0 M 0.0 M
7/15/2018 7:00 AM 0.00 0.0 M 0.0 M
7/16/2018 7:00 AM 0.25 0.0 M 0.0 M max temp at midnight 15th, overcast and cool (mid 60s) during day. A couple of periods of rain mid-aftn through early evening, then cleared enough to see the great show put on by Venus and the Moon.
7/17/2018 7:00 AM 0.00 0.0 M 0.0 M
7/18/2018 7:00 AM 0.05 0.0 M 0.0 M a few drops mid-aftn, on the northern fringe of thundershower with some small hail early evening (.05"), then another light shower after midnight
7/19/2018 7:00 AM 0.00 0.0 M 0.0 M
7/20/2018 7:00 AM 0.00 0.0 M 0.0 M
7/21/2018 7:00 AM 0.00 0.0 M 0.0 M
7/22/2018 7:00 AM 0.02 0.0 M 0.0 M brief late-aftn shower
7/23/2018 7:00 AM 0.09 0.0 M 0.0 M Showers mid-aftn through late evening. Thunder south early evening.
7/24/2018 7:00 AM 0.92 0.0 M 0.0 M Sunny early, then incr low clds -> ovc by late morning. Afternoon & evening thunderstorms. First one, mid-aftn, bit over 1/2"; second, late aftn, ~1/4"; third, mid-eve, a tenth.
7/25/2018 7:00 AM 0.00 0.0 M 0.0 M
7/26/2018 7:00 AM 0.51 0.0 M 0.0 M two quick, heavy thundershowers
7/27/2018 7:00 AM 0.11 0.0 M 0.0 M thunderstorm blew up quickly late evening, including a few minutes of moderate rain
7/28/2018 7:00 AM 0.04 0.0 M 0.0 M a few early-morning drops, a couple of aftn showers, another mid-eve, another before dawn; ovc at sunrise
7/29/2018 7:00 AM 0.03 0.0 M 0.0 M RWU late aftn/eve
7/30/2018 7:00 AM 0.00 0.0 M 0.0 M
7/31/2018 7:00 AM 0.00 0.0 M 0.0 M
8/1/2018 7:00 AM 0.00 0.0 M 0.0 M
8/2/2018 7:00 AM 0.00 0.0 M 0.0 M
8/3/2018 7:00 AM 0.00 0.0 M 0.0 M
8/4/2018 7:00 AM 0.05 0.0 M 0.0 M Mo ovc w/showers off and on. Quite windy, evening.
8/5/2018 7:00 AM T 0.0 M 0.0 M a couple light aftn showers
8/6/2018 7:00 AM 0.01 0.0 M 0.0 M a couple of light showers in the morning
8/7/2018 7:00 AM 0.00 0.0 M 0.0 M
8/8/2018 7:00 AM 0.00 0.0 M 0.0 M
8/9/2018 7:00 AM 0.00 0.0 M 0.0 M
8/10/2018 7:00 AM 0.00 0.0 M 0.0 M
8/11/2018 7:00 AM 0.00 0.0 M 0.0 M
8/12/2018 7:00 AM 0.00 0.0 M 0.0 M
8/13/2018 7:00 AM 0.00 0.0 M 0.0 M
8/14/2018 7:00 AM 0.00 0.0 M 0.0 M
8/15/2018 7:00 AM 0.42 0.0 M 0.0 M late afternoon (.06") and early evening thundershowers
8/16/2018 7:00 AM 0.00 0.0 M 0.0 M
8/17/2018 7:00 AM 0.00 0.0 M 0.0 M
8/18/2018 7:00 AM 0.00 0.0 M 0.0 M
8/19/2018 7:00 AM 1.56 0.0 M 0.0 M Light rain shower near noon .02"; TRW- mid-evening .02"; TRW+ late evening 1.52" in 25 min, with some A1/8" first couple of minutes
8/20/2018 7:00 AM 0.00 0.0 M 0.0 M
8/21/2018 7:00 AM T 0.0 M 0.0 M a very light rain shower in progress at obs time
8/22/2018 7:00 AM T 0.0 M 0.0 M A couple of light showers. Overcast and very cool for August (max 66F).
8/23/2018 7:00 AM 0.00 0.0 M 0.0 M
8/24/2018 7:00 AM 0.00 0.0 M 0.0 M
8/25/2018 7:00 AM 0.00 0.0 M 0.0 M
8/26/2018 7:00 AM 0.00 0.0 M 0.0 M
8/27/2018 7:00 AM T 0.0 M 0.0 M strong winds ca 0300-0515, with a few drops of rain late in the event
8/28/2018 7:00 AM 0.00 0.0 M 0.0 M
8/29/2018 7:00 AM 0.00 0.0 M 0.0 M
8/30/2018 7:00 AM 0.00 0.0 M 0.0 M
8/31/2018 7:00 AM 0.00 0.0 M 0.0 M
9/1/2018 7:00 AM T 0.0 M 0.0 M three very light afternoon showers
9/2/2018 7:00 AM 0.00 0.0 M 0.0 M
9/3/2018 7:00 AM 0.00 0.0 M 0.0 M
9/4/2018 7:00 AM 0.00 0.0 M 0.0 M
9/5/2018 7:00 AM 0.60 0.0 M 0.0 M lightning SW ca 2230, then RW-/TRW- after midnight
9/6/2018 7:00 AM 0.06 0.0 M 0.0 M light thundershowers and showers late aftn through early eve
9/7/2018 7:00 AM 0.02 0.0 M 0.0 M light mid-aftn shower
9/8/2018 7:00 AM 0.00 0.0 M 0.0 M
9/9/2018 7:00 AM 0.00 0.0 M 0.0 M
9/10/2018 7:00 AM 0.00 0.0 M 0.0 M
9/11/2018 7:00 AM 0.00 0.0 M 0.0 M
9/12/2018 7:00 AM T 0.0 M 0.0 M some mostly-dry showers with gusty winds late am to mid-day - only a very few drops at our location
9/13/2018 7:00 AM 0.00 0.0 M 0.0 M
9/14/2018 7:00 AM 0.00 0.0 M 0.0 M
9/15/2018 7:00 AM 0.00 0.0 M 0.0 M
9/16/2018 7:00 AM 0.00 0.0 M 0.0 M
9/17/2018 7:00 AM 0.00 0.0 M 0.0 M
9/18/2018 7:00 AM 0.00 0.0 M 0.0 M
9/19/2018 7:00 AM 0.00 0.0 M 0.0 M
9/20/2018 7:00 AM 0.02 0.0 M 0.0 M light showers late afternoon through late evening (some heavy thundershowers not far east)
9/21/2018 7:00 AM 0.00 0.0 M 0.0 M
9/22/2018 7:00 AM 0.00 0.0 M 0.0 M
9/23/2018 7:00 AM 0.00 0.0 M 0.0 M
9/24/2018 7:00 AM 0.00 0.0 M 0.0 M
9/25/2018 7:00 AM 0.00 0.0 M 0.0 M
9/26/2018 7:00 AM 0.00 0.0 M 0.0 M
9/27/2018 7:00 AM 0.00 0.0 M 0.0 M
9/28/2018 7:00 AM 0.00 0.0 M 0.0 M
9/30/2018 7:00 AM 0.00 0.0 M 0.0 M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground
5/12/2018 7:08 PM More white ice than clear. Only a few 3/8" stones. 3/8" 1/4" Pea Size 1/4" Pea Size Hard|Clear Ice|White Ice 3 1min minor leaf damage Continuous True After rain After smaller hail vertical
5/13/2018 9:05 PM 1/4" Pea Size Rice Rice Hard|White Ice 15 3min no damage Continuous True After rain
6/18/2018 7:38 PM Hail started a minute or two after rain. A very few for a couple of minutes, then started to get some large stones. First big stone (1 1/2") landed 1942 - was about 7/8" white ice with a clear shell. Numerous 3/4" - 1" stones with a few larger - mostly white ice. Rain and hail ended essentially simultaneously. 1 1/2" Ping Pong Ball Size 1/2" Grape 1/4" Pea Size Hard|Clear Ice|White Ice 13 1min shredded leaves Continuous True After rain After smaller hail 10-20