Station Overview Station Location
Station Number CO-BO-220 Latitude 40.0591
Station Name Boulder 4.7 ENE Longitude -105.1717
County Boulder Elevation (ft) 5272



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 1.08 2.34 29 2.34 29 0.00 0 0 9 0 5.1 4 4
Nov 17 0.83 0.55 30 0.55 30 0.00 0 0 5 2 2.8 2 4
Dec 17 0.67 0.49 29 0.49 29 0.00 0 0 4 4 6.8 5 8
Jan 18 0.47 0.60 29 0.60 29 0.00 0 0 4 2 5.6 3 10
Feb 18 0.53 0.87 26 0.87 26 0.00 0 0 7 5 11.6 7 14
March 18 1.63 2.14 30 2.14 30 0.00 0 0 6 1 4.3 3 3
April 18 1.97 1.14 27 1.14 27 0.00 0 0 9 2 2.6 4 2
May 18 2.23 4.95 29 4.95 29 0.00 0 0 12 3 0.0 0 0
June 18 1.80 1.48 29 1.48 29 0.00 0 0 5 3 0.0 0 0
July 18 1.51 2.54 29 2.54 29 0.00 0 0 9 2 0.0 0 0
Aug 18 1.49 0.77 24 0.77 24 0.00 0 0 5 1 0.0 0 0
Sept 18 1.46 0.72 28 0.72 28 0.00 0 0 4 5 0.0 0 0
Water Year Totals: 15.67" 18.59" 339 days 18.59" 339 0.00" 0 days 0 79 days 30 days 38.8" 28 days 45 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 0.04
10/2/2017 0.74
10/3/2017 0.52
10/4/2017 0.02
10/5/2017 0.00
10/6/2017
10/7/2017 0.00
10/8/2017 0.00
10/9/2017 0.60
10/10/2017 0.28
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
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 0.03
10/31/2017 0.05
11/1/2017 0.00
11/2/2017 0.00
11/3/2017 0.00
11/4/2017 0.00
11/5/2017 T
11/6/2017 T
11/7/2017 0.24
11/8/2017 0.24
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 0.05
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 0.00
11/26/2017 0.00
11/27/2017 0.00
11/28/2017 0.01
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
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 0.08
12/15/2017 0.00
12/16/2017 0.00
12/17/2017 0.00
12/18/2017 0.00
12/19/2017
12/20/2017 0.00
12/21/2017 0.12
12/22/2017 0.06
12/23/2017 0.00
12/24/2017 0.23
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 T
1/16/2018 0.06
1/17/2018 0.00
1/18/2018 0.00
1/19/2018 0.00
1/20/2018 0.00
1/21/2018 0.34
1/22/2018 0.18
1/23/2018 0.00
1/24/2018 0.00
1/25/2018 0.00
1/26/2018 0.00
1/27/2018
1/28/2018 0.00
1/29/2018 0.00
1/30/2018 0.00
1/31/2018
2/1/2018 0.04
2/2/2018
2/3/2018 0.00
2/4/2018 T
2/5/2018 T
2/6/2018 T
2/7/2018 0.00
2/8/2018 0.00
2/9/2018 T
2/10/2018 0.07
2/11/2018 0.07
2/12/2018 0.00
2/13/2018 T
2/14/2018 0.00
2/15/2018
2/16/2018 0.03
2/17/2018 0.00
2/18/2018 0.00
2/19/2018 0.04
2/20/2018 0.47
2/21/2018 0.00
2/22/2018 0.00
2/23/2018 0.00
2/24/2018 0.15
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
3/16/2018 0.16
3/17/2018 0.00
3/18/2018 0.00
3/19/2018 0.80
3/20/2018 T
3/21/2018 0.00
3/22/2018 0.00
3/23/2018 0.00
3/24/2018 0.00
3/25/2018 0.00
3/26/2018 0.03
3/27/2018 0.64
3/28/2018 0.00
3/29/2018 0.50
3/30/2018 0.01
3/31/2018 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2018 0.02
4/2/2018 T
4/3/2018 0.00
4/4/2018 0.00
4/5/2018 0.00
4/6/2018 0.00
4/7/2018 0.18
4/8/2018 T
4/9/2018 0.04
4/10/2018 0.03
4/11/2018
4/12/2018 0.00
4/13/2018 0.03
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
4/20/2018 0.00
4/21/2018 0.31
4/22/2018 0.08
4/23/2018 0.00
4/24/2018 0.21
4/25/2018 0.24
4/26/2018 0.00
4/27/2018 0.00
4/28/2018 0.00
4/29/2018
4/30/2018 0.00
5/1/2018 0.00
5/2/2018 T
5/3/2018 1.15
5/4/2018 0.52
5/5/2018 0.00
5/6/2018 T
5/7/2018 0.00
5/8/2018
5/9/2018 0.00
5/10/2018 0.00
5/11/2018 0.00
5/12/2018 0.06
5/13/2018 0.46
5/14/2018 0.89
5/15/2018 0.02
5/16/2018 0.00
5/17/2018 0.00
5/18/2018 0.00
5/19/2018 1.56
5/20/2018 0.09
5/21/2018 0.06
5/22/2018 0.00
5/23/2018 0.06
5/24/2018 T
5/25/2018 0.00
5/26/2018 0.00
5/27/2018 0.00
5/28/2018 0.00
5/29/2018 0.06
5/30/2018 0.02
5/31/2018
6/1/2018 0.00
6/2/2018 0.00
6/3/2018 0.00
6/4/2018 0.00
6/5/2018
6/6/2018 0.00
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 0.02
6/17/2018 T
6/18/2018 0.40
6/19/2018 0.66
6/20/2018 0.35
6/21/2018 0.00
6/22/2018 0.00
6/23/2018 0.00
6/24/2018 T
6/25/2018 0.05
6/26/2018 0.00
6/27/2018 0.00
6/28/2018 0.00
6/29/2018 0.00
6/30/2018 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2018 0.18
7/2/2018 0.00
7/3/2018 0.00
7/4/2018 0.00
7/5/2018 0.00
7/6/2018 0.26
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 0.00
7/14/2018 0.00
7/15/2018 0.00
7/16/2018 0.17
7/17/2018 0.00
7/18/2018 T
7/19/2018 0.00
7/20/2018 0.00
7/21/2018
7/22/2018
7/23/2018 0.05
7/24/2018 1.12
7/25/2018 0.00
7/26/2018 0.71
7/27/2018 T
7/28/2018 0.01
7/29/2018 0.03
7/30/2018 0.01
7/31/2018 0.00
8/1/2018 0.00
8/2/2018 0.00
8/3/2018 T
8/4/2018 0.07
8/5/2018
8/6/2018
8/7/2018
8/8/2018 0.00
8/9/2018 0.00
8/10/2018 0.00
8/11/2018 0.00
8/12/2018
8/13/2018 0.00
8/14/2018
8/15/2018 0.58
8/16/2018 0.00
8/17/2018 0.00
8/18/2018 0.00
8/19/2018 0.09
8/20/2018 0.01
8/21/2018 0.00
8/22/2018 0.02
8/23/2018 0.00
8/24/2018 0.00
8/25/2018 0.00
8/26/2018 0.00
8/27/2018 0.00
8/28/2018
8/29/2018 0.00
8/30/2018 0.00
8/31/2018
9/1/2018 0.00
9/2/2018 0.00
9/3/2018 0.00
9/4/2018 0.00
9/5/2018 0.65
9/6/2018 0.02
9/7/2018 0.02
9/8/2018 0.00
9/9/2018 T
9/10/2018 T
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 T
9/19/2018 0.00
9/20/2018 0.03
9/21/2018 0.00
9/22/2018
9/23/2018 0.00
9/24/2018 0.00
9/25/2018 T
9/26/2018 0.00
9/27/2018 0.00
9/28/2018
9/29/2018 0.00
9/30/2018 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2017 7:00 AM 0.04 M M M M Light early morning shower (6 AM); most of the rain around 5 PM
10/2/2017 7:00 AM 0.74 0.0 0.00 0.0 0.00 Occasional showers through the day yesterday. Still raining at 7 AM
10/3/2017 7:00 AM 0.52 0.0 0.00 0.0 0.00 Very dark clouds, with measurable rain through most of the morning and most of the afternoon/evening, lighter at midday. Clearing in the night, ice on the cars, grass, and bark surfaces this morning.
10/4/2017 7:00 AM 0.02 0.0 0.00 0.0 0.00
10/5/2017 7:00 AM 0.00 0.0 0.00 0.0 M {EDIT: Observer reported 9.00 for total SWE. This appears to be a typo. Changed 9.00 to NA until observer can be contacted to verify. Submission Time Before EDIT: 10/05/2017 8:48 AM CoCoSTAFF DNT}
10/7/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/8/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 Windy most of the day/night.
10/9/2017 7:00 AM 0.60 2.1 0.37 2.0 M Changeover to snow about 12:30 AM. Snowing at observation time.
10/10/2017 7:00 AM 0.28 1.6 0.28 0.5 M Snowfall measured at 1 PM as the snow was ending, with clearing skies and periods of sunlight. Overnight low 26.4. Deepest total snow measured 4.4 inches at 1 PM; getting patchy by morning, with no snow on or under trees. Roads stayed clear throughout.
10/11/2017 7:00 AM 0.00 0.0 0.00 T M
10/12/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/13/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/14/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/15/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 Windy until evening.
10/16/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/17/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/18/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/19/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/20/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/21/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/22/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/23/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/25/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/26/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/27/2017 7:00 AM 0.06 0.6 M 0.5 M Precipitation began as snow, no rain or rain/snow mix observed. A rabbit ran through and sat on the snow board, so a core could not be obtained. Snow appeared to have stopped by 9 PM
10/28/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 Clear of snow in sunlit areas by mid-morning
10/29/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
10/30/2017 7:00 AM 0.03 0.0 0.00 0.0 0.00 Fine, misting rain. Ice in the cylinder and on wood and grass surfaces, and on cars, not on sidewalks or roads.
10/31/2017 7:00 AM 0.05 0.8 0.03 1.0 0.03 Rain changed to snow about 9 AM, gradually stopped, then snow again in the night
11/1/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 Winds shifted and temperature started rising about 9 PM
11/2/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/3/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/4/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/5/2017 7:00 AM T 0.0 0.00 0.0 0.00 Sidewalks/road wet this morning
11/6/2017 7:00 AM T 0.0 0.00 0.0 0.00
11/7/2017 7:00 AM 0.24 2.0 0.20 2.0 0.19
11/8/2017 7:00 AM 0.24 0.8 0.09 2.0 M
11/9/2017 7:00 AM 0.00 0.0 0.00 10.0 M Ground about half covered with approx. 2 inches of snow.
11/10/2017 7:00 AM 0.00 0.0 0.00 0.5 M Surfaces about a quarter covered with less than 2 inches of snow.
11/11/2017 7:00 AM 0.00 0.0 0.00 T M
11/12/2017 7:00 AM 0.00 0.0 0.00 T M A little snow left in the most protected areas.
11/13/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/14/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/15/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/16/2017 7:00 AM 0.00 M M M M Submitted via CoCoRaHS Observer for Android version 2.1.0 (build 21001)
11/17/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/18/2017 7:00 AM 0.05 0.0 0.00 0.0 0.00 Various instances of raindrops blown in starting 8:45 AM, ahead of the storm, windy through most of the day.
11/19/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/20/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/21/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/22/2017 7:00 AM 0.01 0.0 0.00 0.0 0.00 A second round of dark clouds in the afternoon was not noticed to produce any precipitation
11/23/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/24/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/25/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/26/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/27/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/28/2017 7:00 AM 0.01 0.0 0.00 0.0 0.00 After very warm day, the wind came up just after 11 PM, one long gust measured at 20 mph, possibly some sprinkles, definitely wet outside at 4 AM.
11/29/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
11/30/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/1/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/2/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/3/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/4/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 dry wind all night long, amazingly steady out of the WNW.
12/5/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/6/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/7/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 sunny and cold; clouds only over the mountain
12/9/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/10/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/11/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/12/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 Still unseasonably warm and very dry. We will need to water.
12/13/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00 moderate winds kept temperatures above 55 degrees for most of the night until winds shifted about 4 AM.
12/14/2017 7:00 AM 0.08 1.1 0.06 1.0 M Came in the night.
12/15/2017 7:00 AM 0.00 0.0 0.00 T M About half and inch of snow left over about half of the surfaces other than concrete/pavement
12/16/2017 7:00 AM 0.00 0.0 0.00 T M
12/17/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/18/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/20/2017 7:00 AM 0.00 0.0 0.00 0.0 0.00
12/21/2017 7:00 AM 0.12 1.5 0.12 1.5 0.12
12/22/2017 7:00 AM 0.06 0.7 M 1.5 M About 2 inches on the ground peak. Snow ended gradually, by 11:00 AM.
12/23/2017 7:00 AM 0.00 0.0 0.00 0.5 M Enough sun yesterday to do significant melting in sunny areas.
12/24/2017 7:00 AM 0.23 3.4 0.25 3.5 M Snow accompanied by wind at times.
12/25/2017 7:00 AM 0.00 0.0 0.00 3.0 M
12/26/2017 7:00 AM T T T 2.0 M
12/27/2017 7:00 AM T T T 2.0 M Light flurries mostly floating through the air through most of the day without accumulation
12/28/2017 7:00 AM 0.00 0.0 0.00 T M Warm wind started about 10 AM with a rapid 30 degree temperature rise; stayed above 40 degrees all night.
12/29/2017 7:00 AM 0.00 0.0 0.00 T M Snow cover limited to areas sheltered from wind and sunshine.
12/30/2017 7:00 AM T T T T M
12/31/2017 7:00 AM T 0.1 T T M Still patchy snow in shaded/wind protected areas, as well as a skiff from last night. Light flurries through the morning yesterday.
1/1/2018 7:00 AM T T T T M
1/2/2018 7:00 AM 0.00 0.0 0.00 T M Foggy and frosty yesterday morning.
1/3/2018 7:00 AM 0.00 0.0 0.00 T M Snow on the ground unchanged for the past several days: patchy in the shady and wind protected areas.
1/4/2018 7:00 AM 0.00 0.0 0.00 T M Temperature finally a little warmer, reaching 50 degrees, but backyard snow is essentially unchanged at patchy.
1/5/2018 7:00 AM 0.00 0.0 0.00 T M
1/6/2018 7:00 AM 0.00 0.0 0.00 T M Snow is finally visibly thinner in the back yard (mostly about 1") and clear patches getting larger. Maybe 25% coverage in this shaded/sheltered area (none in sunny/exposed areas)
1/7/2018 7:00 AM 0.00 0.0 0.00 T M
1/8/2018 7:00 AM 0.00 0.0 0.00 T M Very small patches in the back yard now.
1/9/2018 7:00 AM 0.00 0.0 0.00 T T Temperature mostly over 50 degrees from shortly after midnight until about 6 AM, but still a small trace of snow left in the back yard.
1/10/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
1/11/2018 7:00 AM 0.02 0.0 0.00 0.0 0.00
1/12/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
1/13/2018 7:00 AM 0.00 0.0 M M M
1/14/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
1/15/2018 7:00 AM T T T T T Light snow at observation time
1/16/2018 7:00 AM 0.06 0.7 M 1.0 M No rain noted
1/17/2018 7:00 AM 0.00 0.0 0.00 0.5 M
1/18/2018 7:00 AM 0.00 0.0 0.00 T M
1/19/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00 56 degrees at observation time, winds under 10 mph
1/20/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
1/21/2018 7:00 AM 0.34 3.2 0.32 3.0 M
1/22/2018 7:00 AM 0.18 1.7 0.20 4.0 M Snowfall faded out somewhere in the early afternoon.
1/23/2018 7:00 AM 0.00 0.0 0.00 3.0 M
1/24/2018 7:00 AM 0.00 0.0 0.00 2.0 M
1/25/2018 7:00 AM 0.00 0.0 0.00 20.0 M
1/26/2018 7:00 AM 0.00 0.0 0.00 1.5 M
1/28/2018 7:00 AM 0.00 0.0 0.00 1.0 M Snow becoming patchy in sunny areas; still over 2 inches in shaded/wind protected areas
1/29/2018 7:00 AM 0.00 0.0 0.00 0.5 M Estimated snow on the ground, based on range of 2 inches in most protected areas to patchy or clear in less protected areas.
1/30/2018 7:00 AM 0.00 0.0 0.00 T M One inch of snow remains in sheltered areas
2/1/2018 7:00 AM 0.04 0.6 0.04 0.5 0.04
2/3/2018 7:00 AM 0.00 0.0 0.00 T M
2/4/2018 7:00 AM T T T T T
2/5/2018 7:00 AM T T T T T Minimal patches of snow in the most shady, protected areas.
2/6/2018 7:00 AM T T T T T Beautiful rainbow to the west during 7:15 AM shower; trace amount of precip then; about a quarter teaspoon of flurries in the cylinder this morning from unknown time. Snow patches in the sheltered/shady back yard are gone.
2/7/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
2/8/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
2/9/2018 7:00 AM T T T T T very fine snow mixed with misting rain near observation time.
2/10/2018 7:00 AM 0.07 1.1 0.07 1.0 0.07 A light, freezing falling mist in the morning, starting before observation time and continuing until after 8:45 AM; snow beginning by 6:30 PM, with streets white by 9:00 PM Still snowing at observation time.
2/11/2018 7:00 AM 0.07 0.7 M 1.5 M Snow gradually tapered off mid-afternoon
2/12/2018 7:00 AM 0.00 0.0 0.00 T M Sunny areas are clear; mostly less than 1" in shady areas.
2/13/2018 7:00 AM T T T T M Less than one inch of snow on about 1/3 to 1/4 of surface area. light snow, mostly flurries, may have amounted to almost .1 at one time, all gone this morning.
2/14/2018 7:00 AM 0.00 0.0 0.00 T T small patches of snow left in the shade
2/16/2018 7:00 AM 0.03 0.3 0.03 0.5 0.03 Depth ranging from .1 to .5 that I noticed, depending how the snow swirled. Streets and sidewalks mostly clear.
2/17/2018 7:00 AM 0.00 0.0 0.00 T T Windy through the night with warmer temperatures. A small amount of snow is left in the most protected areas only.
2/18/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
2/19/2018 7:00 AM 0.04 0.9 0.02 1.0 M Ground noted to be wet 11:30 PM; some snow on the ground by 3:30; coming down hard at observation time.
2/20/2018 7:00 AM 0.47 5.6 0.44 6.0 0.44 High 2.3 degrees at midnight; 0.2 at observation time. Clear blue skies.
2/21/2018 7:00 AM 0.00 0.0 0.00 4.5 M Continues cold, but mostly sunny.
2/22/2018 7:00 AM 0.00 0.0 0.00 4.0 M
2/23/2018 7:00 AM 0.00 0.0 0.00 3.0 0.43
2/24/2018 7:00 AM 0.15 2.4 0.15 4.5 M
2/25/2018 7:00 AM 0.00 0.0 0.00 3.0 M Cold wind starting early afternoon yesterday blew the snow. 1-3 inches on the ground in sunny/open areas; up to 5 or more in shaded/sheltered areas.
2/26/2018 7:00 AM 0.00 0.0 0.00 2.0 M
2/27/2018 7:00 AM 0.00 0.0 0.00 1.0 M
2/28/2018 7:00 AM 0.00 0.0 0.00 0.5 M Snow is finally getting patchy, and mostly clear in sunny areas.
3/1/2018 7:00 AM 0.00 0.0 0.00 T M
3/2/2018 7:00 AM 0.00 0.0 0.00 T M
3/3/2018 7:00 AM 0.00 0.0 0.00 T T
3/4/2018 7:00 AM 0.00 0.0 0.00 T T
3/5/2018 7:00 AM 0.00 0.0 0.00 T T
3/6/2018 7:00 AM 0.00 0.0 0.00 T T Snow only in the most wind and sun protected areas
3/7/2018 7:00 AM 0.00 0.0 0.00 T T
3/8/2018 7:00 AM 0.00 0.0 0.00 T T Snow still 1-2 inches deep and frozen in in the most protected areas.
3/9/2018 7:00 AM 0.00 0.0 0.00 T T
3/10/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/11/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/12/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/13/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/14/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/16/2018 7:00 AM 0.16 0.0 0.00 0.0 0.00 Gray skies and a few drops at 4 PM; sudden onset of hard rain (.46 inch per hour in 5 minutes ending 8:00 PM) 7:56 PM
3/17/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/18/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/19/2018 7:00 AM 0.80 0.8 M 1.0 M There is a significant layer of frozen slush under the snow on the snowboard and other surfaces. Street and sidewalks clear. Rain/snow mix changed to all snow about 7 PM
3/20/2018 7:00 AM T T T T T
3/21/2018 7:00 AM 0.00 0.0 0.00 T T Snow is gone except in the shadiest, most wind sheltered areas.
3/22/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/23/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/24/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/25/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
3/26/2018 7:00 AM 0.03 0.0 0.00 0.0 0.00 A little foggy this morning; dry and breezy yesterday.
3/27/2018 7:00 AM 0.64 2.1 0.33 1.5 M Rain mixed with snow by 6:15 amid approx 10 degree temperature drop (45 to 35 F.) over half an hour. No accumulation on pavement or concrete surfaces.
3/28/2018 7:00 AM 0.00 0.0 0.00 T T Small patches of snow only
3/29/2018 7:00 AM 0.50 1.4 M 1.0 M Snow depth peaked between 2 and 3 inches before melting exceeded snowfall. Initially rain; mixed with snow by 2:15, all snow by 3:15. No accumulation on paved/concrete surfaces.
3/30/2018 7:00 AM 0.01 T T T T Small patches still left from previous snow; heavy frost on plant and wood surfaces
3/31/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/1/2018 7:00 AM 0.02 T T T T rain-snow mix at still falling at 7 AM
4/2/2018 7:00 AM T T T 0.0 0.00
4/3/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/4/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/5/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/6/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/7/2018 7:00 AM 0.18 0.9 0.10 0.5 M Snow board measurement on top of ice.
4/8/2018 7:00 AM T T T 0.0 0.00
4/9/2018 7:00 AM 0.04 0.0 0.00 0.0 0.00
4/10/2018 7:00 AM 0.03 0.2 M T M Changed to all snow shortly after 7 AM. Brief accumulation measured about 8:00 AM
4/12/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00 Strongest measured gust 41 mph about 1:30 PM; wind gauge somewhat sheltered by trees.
4/13/2018 7:00 AM 0.03 0.0 0.00 0.0 0.00 Noisy, brief shower about 3:30 AM
4/14/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/15/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00 Continued wind, mostly 5-10 mph (measured) through the day, which died about 8 PM
4/16/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/17/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/18/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00 Maybe the windiest day since we have lived here, nearly 40 years. Three wind gusts measured above 50 mph between 2 and 4 PM; large pine tree broken off ten feet up a few houses away; we're going to have to water.
4/20/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/21/2018 7:00 AM 0.31 1.2 0.18 1.0 M Initial .02 of rain between 4:10 and 4:45; another light band and some sunshine. Most of the moisture overnight.
4/22/2018 7:00 AM 0.08 0.0 0.00 0.0 0.00 Rain snow mix without accumulation through most of the morning, tapering off gradually
4/23/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/24/2018 7:00 AM 0.21 0.3 0.08 T M Thundershower at 2:09 PM lasted 10 minutes, with .04 of rain. Cleared and sunny after. About 8:00 PM it was misting rain; large snowflakes observed about 3 AM. Light Rain/snow at observation time.
4/25/2018 7:00 AM 0.24 M M M M
4/26/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/27/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/28/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
4/30/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/1/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/2/2018 7:00 AM T 0.0 0.00 0.0 0.00 Trace just after 7 AM yesterday morning and about 7 AM this morning; very dark sky to the north (toward Niwot) about 1 PM, but no precipitation noted.
5/3/2018 7:00 AM 1.15 0.0 0.00 0.0 0.00
5/4/2018 7:00 AM 0.52 0.0 0.00 0.0 0.00 Major storm ended gradually between 1 and 1:30 PM after steady, light rain all morning. A few stray drops about 6:30 PM apparently from a passing thunderstorm.
5/5/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/6/2018 7:00 AM T 0.0 0.00 0.0 0.00 A few drops accompanied by gusts of cool wind, lasting approx. 10 minutes.
5/7/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/9/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/10/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/11/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/12/2018 7:00 AM 0.06 0.0 0.00 0.0 0.00
5/13/2018 7:00 AM 0.46 0.0 0.00 0.0 0.00 Very steady light rain through the morning. According to electronic rain gauge, rain rate was over 4 inches per hour for at least one 5 minute period. Although we were not home, leaf debris was left in the road indicating water across the road. No indication of hail on the hail board.
5/14/2018 7:00 AM 0.89 0.0 0.00 0.0 0.00 Two hail storms, one beginning 6:11 with heavy rain (hail report filed), one beginning 8:59 lasting about 10 minutes with slightly larger hail, mostly hard, white 1/2 inch, report not filed because of lightning, still damage mostly to tender leaves.
5/15/2018 7:00 AM 0.02 0.0 0.00 0.0 0.00 mostly cloudy all day
5/16/2018 7:00 AM 0.00 M M M M
5/17/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/18/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/19/2018 7:00 AM 1.56 0.0 0.00 0.0 0.00 three waves of hail accompanied by heavy rain and lightning. Rain rate briefly 4.84 at 4:30 PM on Weatherlink for Vantage Vue.
5/20/2018 7:00 AM 0.09 M M M M
5/21/2018 7:00 AM 0.06 0.0 0.00 0.0 0.00
5/22/2018 7:00 AM 0.00 0.0 0.00 0.0 0.00
5/23/2018 7:00 AM 0.06 0.0 0.00 0.0 0.00 Lots of thunder from storms that missed us.
5/24/2018 7:00 AM T 0.0 0.00 0.0 0.00
5/25/2018 7:00 AM 0.00 0.0 M M M
5/26/2018 7:00 AM 0.00 0.0 M M M
5/27/2018 7:00 AM 0.00 0.0 M M M
5/28/2018 7:00 AM 0.00 0.0 M M M
5/29/2018 7:00 AM 0.06 M M M M
5/30/2018 7:00 AM 0.02 0.0 M M M
6/1/2018 7:00 AM 0.00 0.0 M M M
6/2/2018 7:00 AM 0.00 0.0 M M M
6/3/2018 7:00 AM 0.00 0.0 M M M
6/4/2018 7:00 AM 0.00 0.0 M M M
6/6/2018 7:00 AM 0.00 0.0 M M M At least one gust measured at approx. 30 mph about 6:30 PM brought neighbor's leaves in the yard, but no precipitation noted.
6/7/2018 7:00 AM T M M M M
6/8/2018 7:00 AM 0.00 0.0 M M M
6/9/2018 7:00 AM 0.00 0.0 M M M
6/10/2018 7:00 AM 0.00 0.0 M M M Strong winds for about 15 minutes (measured at max. 31 mph) about 7:30 PM. No sign of any thunderstorms around.
6/11/2018 7:00 AM 0.00 0.0 M M M
6/12/2018 7:00 AM 0.00 0.0 M M M
6/13/2018 7:00 AM 0.00 0.0 M M M
6/14/2018 7:00 AM 0.00 0.0 M M M
6/15/2018 7:00 AM 0.00 0.0 M M M
6/16/2018 7:00 AM 0.02 M M M M Two separate .01 showers afternoon and evening.
6/17/2018 7:00 AM T M M M M
6/18/2018 7:00 AM 0.40 M M M M A series of showere
6/19/2018 7:00 AM 0.66 M M M M Light rain in the morning with .01 accumulation. We had an approximately 2 hour series of storms, 5:45-7:45, which included approximately 6 hail segments with small to 1/4 inch white hail, minor leaf damage; two heavy to very heavy but short duration rain segments, and considerable thunder and nearby cloud to ground lightening.
6/20/2018 7:00 AM 0.35 M M M M Short Hail storm with wind driven hail badly stripped/tore plants, especially with larger leaves, like sunflowers and catalpa tree, knocked down many small twigs and leaves from trees, small dents in vehicles. One inch of hail on the ground in open areas, drifted to approx. 5 inches against the house. Included a few hailstones of one inch, but mostly 1/2 inch or smaller. Slightly over 1 inch of water in nearly straight sided bucked that caught the hail.
6/21/2018 7:00 AM 0.00 0.0 M M M
6/22/2018 7:00 AM 0.00 0.0 M M M
6/23/2018 7:00 AM 0.00 0.0 M M M
6/24/2018 7:00 AM T M M M M
6/25/2018 7:00 AM 0.05 M M M M
6/26/2018 7:00 AM 0.00 0.0 M M M
6/27/2018 7:00 AM 0.00 0.0 M M M
6/28/2018 7:00 AM 0.00 0.0 M M M
6/29/2018 7:00 AM 0.00 0.0 M M M High temperature recorded as 100.8 on VUE
6/30/2018 7:00 AM 0.00 0.0 M M M
7/1/2018 7:00 AM 0.18 M M M M
7/2/2018 7:00 AM 0.00 0.0 M M M
7/3/2018 7:00 AM 0.00 0.0 M M M
7/4/2018 7:00 AM 0.00 0.0 M M M
7/5/2018 7:00 AM 0.00 0.0 M M M
7/6/2018 7:00 AM 0.26 M M M M
7/7/2018 7:00 AM 0.00 0.0 M M M
7/8/2018 7:00 AM 0.00 0.0 M M M
7/9/2018 7:00 AM 0.00 0.0 M M M
7/10/2018 7:00 AM 0.00 0.0 M M M
7/11/2018 7:00 AM 0.00 0.0 M M M
7/12/2018 7:00 AM 0.00 0.0 M M M
7/13/2018 7:00 AM 0.00 0.0 M M M
7/14/2018 7:00 AM 0.00 0.0 M M M
7/15/2018 7:00 AM 0.00 0.0 M M M
7/16/2018 7:00 AM 0.17 M M M M Light sprinkles early,several small showers through the day,cool and cloudy all day.
7/17/2018 7:00 AM 0.00 0.0 M M M
7/18/2018 7:00 AM T 0.0 0.00 0.0 0.00 two drops in the gauge.
7/19/2018 7:00 AM 0.00 0.0 M M M
7/20/2018 7:00 AM 0.00 M M M M
7/23/2018 7:00 AM 0.05 M M M M
7/24/2018 7:00 AM 1.12 0.0 0.00 0.0 0.00 Two bands of hard rain plus bands of showers. Per VUE, .42 inches in 10 minutes between 3:35 and 3:45 PM; another with rain rate above 1 inch/hr for 10 minutes about 5 PM. Street flooding on the heavy side of "usual". No hail included.
7/25/2018 7:00 AM 0.00 0.0 M M M
7/26/2018 7:00 AM 0.71 M M M M Two brief but intense showers, the lighter one about 6:45 PM with .37 accumulation, .20 of it in 5 minutes between 6:50 and 6:55, the second about 2 AM, with most of the rest of the accumulation in less than 10 minutes.
7/27/2018 7:00 AM T M M M M
7/28/2018 7:00 AM 0.01 M M M M
7/29/2018 7:00 AM 0.03 M M M M Various light showers through the afternoon/evening
7/30/2018 7:00 AM 0.01 M M M M Cool and cloudy all day but only a small shower or two. Cool wind with about ten degree temperature drop about 6 PM.
7/31/2018 7:00 AM 0.00 0.0 M M M
8/1/2018 7:00 AM 0.00 0.0 M M M
8/2/2018 7:00 AM 0.00 0.0 M M M
8/3/2018 7:00 AM T M M M M
8/4/2018 7:00 AM 0.07 M M M M
8/8/2018 7:00 AM 0.00 0.0 M M M
8/9/2018 7:00 AM 0.00 0.0 M M M
8/10/2018 7:00 AM 0.00 0.0 M M M
8/11/2018 7:00 AM 0.00 0.0 M M M
8/13/2018 7:00 AM 0.00 0.0 M M M
8/15/2018 7:00 AM 0.58 M M M M 3 separate short but heavy showers between 6:30 and 9 PM, with a light shower between 4:30 and 5 PM
8/16/2018 7:00 AM 0.00 M M M 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 M M
8/19/2018 7:00 AM 0.09 M M M M lots of noise, but only small showers, .04 about noon to 1 pm, .03 8 pm, and .02 11 pm.
8/20/2018 7:00 AM 0.01 M M M M
8/21/2018 7:00 AM 0.00 0.0 M M M
8/22/2018 7:00 AM 0.02 M M M M First shower (.01) shortly after observation time yesterday, another probably in the night.
8/23/2018 7:00 AM 0.00 0.0 M M M
8/24/2018 7:00 AM 0.00 0.0 M M M
8/25/2018 7:00 AM 0.00 0.0 M M M
8/26/2018 7:00 AM 0.00 0.0 M M M
8/27/2018 7:00 AM 0.00 0.0 M M M Wind, and thunder and lightning north and south, but no rain.
8/29/2018 7:00 AM 0.00 0.0 M M M
8/30/2018 7:00 AM 0.00 0.0 M M M
9/1/2018 7:00 AM 0.00 0.0 M M M
9/2/2018 7:00 AM 0.00 0.0 M M M
9/3/2018 7:00 AM 0.00 0.0 M M M
9/4/2018 7:00 AM 0.00 0.0 M M M
9/5/2018 7:00 AM 0.65 M M M M
9/6/2018 7:00 AM 0.02 M M M M
9/7/2018 7:00 AM 0.02 M M M M
9/8/2018 7:00 AM 0.00 0.0 M M M Fog forming at observation time.
9/9/2018 7:00 AM T M M M M
9/10/2018 7:00 AM T M M M M Light trace 4:52 PM at least, possibly other times
9/11/2018 7:00 AM 0.00 0.0 M M M
9/12/2018 7:00 AM T M M M M
9/13/2018 7:00 AM 0.00 0.0 M M M
9/14/2018 7:00 AM 0.00 0.0 M M M
9/15/2018 7:00 AM 0.00 0.0 M M M
9/16/2018 7:00 AM 0.00 0.0 M M M
9/17/2018 7:00 AM 0.00 0.0 M M M
9/18/2018 7:00 AM T M M M M A minimal trace made it to the ground a couple times in the late afternoon/evening, would not have been noticed if I hadn't been outside.
9/19/2018 7:00 AM 0.00 0.0 M M M
9/20/2018 7:00 AM 0.03 M M M M A cool, cloudy morning today
9/21/2018 7:00 AM 0.00 0.0 M M M
9/23/2018 7:00 AM 0.00 0.0 M M M
9/24/2018 7:00 AM 0.00 0.0 M M M
9/25/2018 7:00 AM T M M M M Almost enough to make the sidewalk wet
9/26/2018 7:00 AM 0.00 0.0 M M M
9/27/2018 7:00 AM 0.00 0.0 M M M
9/29/2018 7:00 AM 0.00 0.0 M M M
9/30/2018 7:00 AM 0.00 0.0 M M M Cool and cloudy, no precip.



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
5/13/2018 6:10 PM Rapid melting prevented much accumulation on ground 1/2" Grape 1/4" Pea Size Rice Hard|White Ice 11 1min minor leaf damage Continuous True After rain After smaller hail .25
5/18/2018 3:59 PM More light hail starting as I write this, 4:16 PM 3/8" 1/4" Pea Size Rice Mixed 12 1min no damage Intermittent False After rain After smaller hail
5/18/2018 4:16 PM 3/8" 1/4" Pea Size Rice Hard|White Ice 9 1min minor leaf damage Continuous True After rain Same time as smaller hail vertical
6/19/2018 12:31 PM Came at least a 45 degree angle from the north; high wind gust measured 24 mph. 1" Quarter Size 1/2" Grape 1/4" Pea Size Hard|Clear Ice|White Ice 5 1min shredded leaves.car dents Continuous False After rain After smaller hail 0 1.0