Station Overview Station Location
Station Number CO-BO-306 Latitude 40.10444444
Station Name Niwot 0.9 NE Longitude -105.1438889
County Boulder Elevation (ft) 5141



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 1.02 1.72 24 0.41 16 1.31 8 3 5 0 0.0 0 1
Nov 17 0.85 0.51 12 0.48 6 0.03 6 2 3 0 0.0 0 0
Dec 17 0.58 0.01 20 0.01 3 0.00 17 0 1 0 1.0 1 0
Jan 18 0.42 0.30 25 0.00 11 0.30 14 4 0 0 0.0 0 0
Feb 18 0.50 0.33 19 0.19 13 0.14 6 2 4 1 0.0 0 0
March 18 1.55 0.76 21 0.76 9 0.00 12 1 2 1 0.0 0 0
April 18 1.85 1.68 29 0.34 13 1.34 16 4 3 0 0.0 0 0
May 18 2.33 4.18 8 1.15 2 3.03 6 3 2 0 0.0 0 0
June 18 1.79 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
July 18 1.32 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Aug 18 1.37 0.00 1 0.00 0 0.00 1 0 0 0 0.0 0 0
Sept 18 1.45 1.35 32 0.04 8 1.31 24 7 1 1 0.0 0 0
Water Year Totals: 15.03" 10.84" 191 days 3.38" 81 7.46" 110 days 26 21 days 3 days 1.0" 1 days 1 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 **
10/2/2017 0.84
10/3/2017 0.04
10/4/2017 0.00
10/5/2017 0.00
10/6/2017 0.00
10/7/2017 **
10/8/2017 **
10/9/2017 0.47
10/10/2017 0.24
10/11/2017 M
10/12/2017 0.00
10/13/2017
10/14/2017
10/15/2017
10/16/2017
10/17/2017 0.00
10/18/2017 0.00
10/19/2017 0.00
10/20/2017 0.01
10/21/2017 **
10/22/2017 **
10/23/2017 0.00
10/24/2017 0.00
10/25/2017 0.00
10/26/2017 0.00
10/27/2017 0.04
10/28/2017
10/29/2017
10/30/2017 0.00
10/31/2017 0.08
11/1/2017 **
11/2/2017 **
11/3/2017 0.00
11/4/2017 **
11/5/2017 **
11/6/2017 0.03
11/7/2017 0.34
11/8/2017 0.09
11/9/2017 0.05
11/10/2017
11/11/2017
11/12/2017
11/13/2017
11/14/2017
11/15/2017 0.00
11/16/2017
11/17/2017 0.00
11/18/2017
11/19/2017
11/20/2017
11/21/2017
11/22/2017
11/23/2017
11/24/2017
11/25/2017
11/26/2017
11/27/2017
11/28/2017 M
11/29/2017 0.00
11/30/2017
12/1/2017
12/2/2017
12/3/2017
12/4/2017
12/5/2017
12/6/2017
12/7/2017 0.00
12/8/2017 0.00
12/9/2017
12/10/2017
12/11/2017
12/12/2017
12/13/2017
12/14/2017 0.01
12/15/2017 **
12/16/2017 **
12/17/2017 **
12/18/2017 **
12/19/2017 **
12/20/2017 **
12/21/2017 **
12/22/2017 **
12/23/2017 **
12/24/2017 **
12/25/2017 **
12/26/2017 **
12/27/2017 **
12/28/2017 **
12/29/2017 **
12/30/2017 **
12/31/2017 **
Day of YearDaily PrcpMultiday Prcp
1/1/2018 **
1/2/2018 **
1/3/2018 **
1/4/2018 0.21
1/5/2018
1/6/2018
1/7/2018 **
1/8/2018 M
1/9/2018 0.00
1/10/2018 0.00
1/11/2018 0.00
1/12/2018 **
1/13/2018 **
1/14/2018 **
1/15/2018 **
1/16/2018 0.09
1/17/2018 0.00
1/18/2018 0.00
1/19/2018
1/20/2018
1/21/2018
1/22/2018
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 **
1/29/2018 T
1/30/2018 0.00
1/31/2018 0.00
2/1/2018 0.03
2/2/2018 0.04
2/3/2018
2/4/2018
2/5/2018 0.10
2/6/2018 T
2/7/2018 0.00
2/8/2018 0.00
2/9/2018 0.00
2/10/2018 **
2/11/2018 **
2/12/2018 0.12
2/13/2018 0.02
2/14/2018 0.00
2/15/2018
2/16/2018
2/17/2018
2/18/2018
2/19/2018
2/20/2018
2/21/2018 0.00
2/22/2018 0.00
2/23/2018 0.00
2/24/2018 **
2/25/2018 **
2/26/2018 0.02
2/27/2018
2/28/2018 0.00
3/1/2018 0.00
3/2/2018 0.00
3/3/2018
3/4/2018
3/5/2018
3/6/2018 T
3/7/2018
3/8/2018
3/9/2018 0.00
3/10/2018 **
3/11/2018 **
3/12/2018 0.00
3/13/2018
3/14/2018 0.00
3/15/2018
3/16/2018 0.16
3/17/2018
3/18/2018
3/19/2018 0.60
3/20/2018
3/21/2018 0.00
3/22/2018 0.00
3/23/2018 **
3/24/2018 **
3/25/2018 **
3/26/2018 **
3/27/2018 **
3/28/2018 **
3/29/2018 **
3/30/2018 **
3/31/2018 **
Day of YearDaily PrcpMultiday Prcp
4/1/2018 **
4/2/2018 0.83
4/3/2018
4/4/2018
4/5/2018 0.00
4/6/2018 0.00
4/7/2018 **
4/8/2018 **
4/9/2018 0.15
4/10/2018 0.00
4/11/2018 0.00
4/12/2018 0.00
4/13/2018 0.01
4/14/2018 **
4/15/2018 **
4/16/2018 0.00 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 **
4/22/2018 **
4/23/2018 0.36
4/24/2018 0.22
4/25/2018 0.11
4/26/2018 **
4/27/2018 **
4/28/2018 **
4/29/2018 **
4/30/2018 **
5/1/2018 0.00
5/2/2018 0.02
5/3/2018 1.13
5/4/2018
5/5/2018
5/6/2018
5/7/2018
5/8/2018
5/9/2018
5/10/2018
5/11/2018
5/12/2018 **
5/13/2018 **
5/14/2018 1.68
5/15/2018
5/16/2018
5/17/2018
5/18/2018
5/19/2018
5/20/2018 **
5/21/2018 1.35
5/22/2018
5/23/2018
5/24/2018
5/25/2018
5/26/2018
5/27/2018
5/28/2018
5/29/2018
5/30/2018
5/31/2018
6/1/2018
6/2/2018
6/3/2018
6/4/2018
6/5/2018
6/6/2018
6/7/2018
6/8/2018
6/9/2018
6/10/2018
6/11/2018
6/12/2018
6/13/2018
6/14/2018
6/15/2018
6/16/2018
6/17/2018
6/18/2018
6/19/2018
6/20/2018
6/21/2018
6/22/2018
6/23/2018
6/24/2018
6/25/2018
6/26/2018
6/27/2018
6/28/2018
6/29/2018
6/30/2018
Day of YearDaily PrcpMultiday Prcp
7/1/2018
7/2/2018
7/3/2018
7/4/2018
7/5/2018
7/6/2018
7/7/2018
7/8/2018
7/9/2018
7/10/2018
7/11/2018
7/12/2018
7/13/2018
7/14/2018
7/15/2018
7/16/2018
7/17/2018
7/18/2018
7/19/2018
7/20/2018
7/21/2018
7/22/2018
7/23/2018
7/24/2018
7/25/2018
7/26/2018
7/27/2018
7/28/2018
7/29/2018
7/30/2018
7/31/2018
8/1/2018
8/2/2018
8/3/2018
8/4/2018
8/5/2018
8/6/2018
8/7/2018
8/8/2018
8/9/2018
8/10/2018
8/11/2018
8/12/2018
8/13/2018
8/14/2018
8/15/2018
8/16/2018
8/17/2018
8/18/2018
8/19/2018
8/20/2018
8/21/2018
8/22/2018
8/23/2018
8/24/2018
8/25/2018
8/26/2018
8/27/2018
8/28/2018
8/29/2018
8/30/2018
8/31/2018 **
9/1/2018 **
9/2/2018 **
9/3/2018 **
9/4/2018 **
9/5/2018 **
9/6/2018 M 0.81
9/7/2018 **
9/8/2018 **
9/9/2018 **
9/10/2018 **
9/11/2018 **
9/12/2018 0.00
9/13/2018 0.00
9/14/2018 0.00
9/15/2018 **
9/16/2018 **
9/17/2018 **
9/18/2018 0.01
9/19/2018 **
9/20/2018 0.17
9/21/2018 0.00
9/22/2018
9/23/2018
9/24/2018 0.04
9/25/2018 T
9/26/2018 0.00
9/27/2018 0.00
9/28/2018 0.00
9/29/2018 **
9/30/2018 **



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/3/2017 8:30 AM 0.04 M M M M The gauge was foggy and there was a trace of condensation.
10/4/2017 7:00 AM 0.00 0.0 M M M Mr. Hollins late start cool, damp cloudy
10/5/2017 7:00 AM 0.00 0.0 M M M cold, damp, breezy. Mr. H
10/6/2017 7:00 AM 0.00 0.0 M M M cloudy, mild and still Mr H
10/10/2017 7:36 AM 0.24 M M 0.5 M The water in the gauge was partially frozen.
10/11/2017 7:41 AM M M M M M It looks like the water was caused by frosted snow that melted. (edit: daily precip changed from 0.09" to NA due to comment above. PG)
10/12/2017 7:36 AM 0.00 0.0 M M M yellow substance from leaves, chilly, wet morning.
10/17/2017 7:00 AM 0.00 0.0 M M M Cold and dry, you could see your own breath. -Drake Morgan&Maraya Haynes
10/18/2017 7:30 AM 0.00 0.0 M M M Cloudy, cool, dry. Sidney Ryan
10/19/2017 7:32 AM 0.00 0.0 M M M Spider inside making spider webs - Lizeth G
10/20/2017 7:00 AM 0.01 M M M M Chilly, cloudy
10/24/2017 7:30 AM 0.00 0.0 M M M Cold, sunny morning
10/25/2017 7:36 AM 0.00 0.0 M M M No water accululation anywhere, tube sllightly off center. Clear weather. -Drake Morgan
10/26/2017 7:00 AM 0.00 0.0 M M M Is is a cool and clear morning Nicholas Baca
10/27/2017 7:45 AM 0.04 M M M M Brought tube in, let snow melt
10/30/2017 7:00 AM 0.00 0.0 M M M Some water but not enough for a measurement. Cold, cloudy Diana webster
10/31/2017 7:00 AM 0.08 M M M M Cold, dry air with snow on the ground (Brandon Barton)
11/7/2017 7:00 AM 0.34 M M M M Cold, bright, snowy
11/8/2017 7:30 AM 0.09 M M M M Cold, glumly, and snowy.
11/9/2017 7:00 AM 0.05 M M M M Cold, sunny
11/15/2017 7:00 AM 0.00 0.0 M M M Sunny and cold -Luis cuevas, leo
11/17/2017 7:30 AM 0.00 0.0 M M M Mild, overcast to the west, Jared
11/28/2017 7:00 AM M M M M M Cold [edit: observer entered .60 and could have been .06. Changed to NA and wrote to volunteer to verify. CoCoStaff NN]
11/29/2017 7:42 AM 0.00 0.0 M M M Frost on the grass. Cold air with some clouds in the sky. Brandon Barton
12/7/2017 7:36 AM 0.00 0.0 M M M Clear sky, breezy, chilly. Drake Morgan
12/8/2017 7:30 AM 0.00 0.0 M M M Cold and a bit cloudy, observer: Alex H
12/14/2017 7:00 AM 0.01 1.0 M M M About an inch of snow on the ground, very cold
1/9/2018 7:00 AM 0.00 0.0 M M M mild, cool partly cloudy, Mr H
1/10/2018 7:20 AM 0.00 0.0 M M M Chilly morning. Beautiful sunrise. Brigid M
1/11/2018 7:48 AM 0.00 0.0 M M M Gloomy, chilly, brisk, dewy, Jensen Douillard and Thomas Bounds
1/17/2018 7:00 AM 0.00 0.0 M M M Frost on the gage. Cold morning with snow on the ground. Brandon Barton
1/18/2018 7:00 AM 0.00 0.0 M M M Cold morning. Snow has mostly melted on the ground. Brandon Barton
1/23/2018 7:00 AM 0.00 0.0 M M M Na
1/24/2018 7:28 AM 0.00 0.0 M M M
1/25/2018 7:29 AM 0.00 0.0 M M M Cold, clear skies - Cayman Kline
1/26/2018 8:35 AM 0.00 0.0 M M M Cold and dry -jared
1/30/2018 7:27 AM 0.00 0.0 M M M It’s an oddly warm morning with a nice sunrise. Brigid M
1/31/2018 7:00 AM 0.00 0.0 M M M There was a lunar eclipse this morning
2/1/2018 7:00 AM 0.03 M M M M {EDIT: Observer reported 0.30 for new precip. QPE data and surrounding reports of T to 0.05 indicate this could be a decimal typo. Changed report of 0.30 to NA until observer can be contacted to verify. Submission Time Before EDIT: 2/01/2018 7:56 AM CoCoSTAFF DNT} (daily precip changed to 0.03". PG)
2/2/2018 7:35 AM 0.04 M M M M Still snow on the floor
2/5/2018 7:41 AM 0.10 M M M M
2/6/2018 7:00 AM T M M M M Cold and cloudy. Grass was frosted and light fog.
2/7/2018 7:00 AM 0.00 0.0 M M M cold, clear, Mr. H
2/8/2018 7:25 AM 0.00 0.0 M M M Chilly, dry - Cayman Kline
2/9/2018 7:00 AM 0.00 0.0 M M M There’s nothing in the rain gauge, but there’s mist
2/13/2018 7:30 AM 0.02 M M M M Frosty, clear skies, sunny
2/14/2018 7:30 AM 0.00 0.0 M M M ~50 degrees F this morning
2/21/2018 7:30 AM 0.00 0.0 M M M Cold, icy
2/22/2018 7:00 AM 0.00 0.0 M M M Cold and crisp, Mr H
2/23/2018 7:00 AM 0.00 0.0 M M M Cold, clear and sunny. Mr H
2/28/2018 7:35 AM 0.00 0.0 M M M Still a little snow and ice on the ground
3/1/2018 8:36 AM 0.00 0.0 M M M Sunny morning, chilly outside
3/2/2018 8:00 AM 0.00 0.0 M M M Clear day, slightly cool
3/6/2018 8:10 AM T M M M M there was a dead ant inside. Sunny but chilly. Kind of windy. -Brisa and Lizeth
3/9/2018 7:00 AM 0.00 0.0 M M M Mild, no wind partly cloudy. Mr H
3/14/2018 7:00 AM 0.00 0.0 M M M Small ants in the rain guage. Brandon Barton
3/16/2018 8:00 AM 0.16 M M M M Cool morning, slightly overcast
3/19/2018 8:30 AM 0.60 M M M M Cloudy, Chilly
3/21/2018 7:00 AM 0.00 0.0 M M M cool, clear, no wind
3/22/2018 7:48 AM 0.00 0.0 M M M Cloudy outside , sort of chilly . -Angel J.
4/5/2018 8:00 AM 0.00 0.0 M M M Clear Cold morning
4/6/2018 7:30 AM 0.00 0.0 M M M
4/10/2018 8:00 AM 0.00 0.0 M M M Cool, breezy and clear. Mr. H
4/11/2018 7:00 AM 0.00 0.0 M M M Mild, breezy and dry
4/12/2018 7:28 AM 0.00 0.0 M M M Warm morning. Very tired. Brigid M
4/13/2018 7:30 AM 0.01 M M M M Barely enough water in container to make a measurement. Cloudy, slightly foggy. -Drake Morgan P.I. Block 5
4/16/2018 7:30 AM 0.00 0.0 M M M Cloudy, cool
4/17/2018 7:31 AM 0.00 0.0 M M M Very clear sky. Small amount of wind. 60 degree weather. -Drake Morgan P.I. Block 5
4/18/2018 7:30 AM 0.00 0.0 M M M Nice morning. There was a bug in the gauge. Brigid M
4/19/2018 7:31 AM 0.00 0.0 M M M Clear sky. Chilly morning.
4/20/2018 7:25 AM 0.00 0.0 M M M Bug in gauge. Cool morning. Brigid M
4/24/2018 7:00 AM 0.22 M M M M cold, cloudy, wet snow drizzle. Fo' shizzle
4/25/2018 7:30 AM 0.11 M M M M ~ freezing this morning
5/2/2018 7:00 AM 0.02 M M M M cold drizzle, cloudy MrH
5/3/2018 7:33 AM 1.13 M M M M Very raining.
9/6/2018 7:00 AM M 0.0 M M M Tuesday night rainstorm, today is cool, cloudy and dew on grass. Janyce. {EDIT: Observer reported 0.81 for new precip. QPE data, notes, and surrounding reports of 0.00 to 0.02 indicate this could be a multi-day report. Changed report of 0.81 to NA until observer can be contacted to verify. Submission Time Before EDIT: 9/06/2018 8:40 AM CoCoSTAFF DNT}
9/13/2018 7:00 AM 0.00 0.0 M M M dry, mild and no precipitation. MrH
9/14/2018 7:00 AM 0.00 0.0 M M M Cool, dry, and clear. MrH
9/21/2018 7:00 AM 0.00 0.0 M M M Cool, damp and overcast. Not even a trace in the gauge. MrH
9/24/2018 7:00 AM 0.04 M M M M Cloudy, slightly windy, grass is damp.-EC
9/25/2018 7:00 AM T M M M M Cooler, breezy and tiny bit of moisture in the bottom. MrH
9/26/2018 7:00 AM 0.00 0.0 M M M Cold, cloudy -Hanna s
9/27/2018 7:00 AM 0.00 0.0 M M M Cool, dry and clear MrH
9/28/2018 7:00 AM 0.00 0.0 M M M Cool, overcast, and dry. MrH



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
9/30/2017 10/02/2017 7:37 AM 3 0.84 M 0.00 It's raining, cold
10/7/2017 10/09/2017 7:35 AM 3 0.47 1.1 M Ice crystals suspended in melted snow/rain
10/21/2017 10/23/2017 7:00 AM 3 0.00 M M It was cold - Kalya
11/1/2017 11/03/2017 8:00 AM 3 0.00 T T Cold
11/4/2017 11/06/2017 7:00 AM 3 0.03 M M Cold, cloudy. Beads of water on outside.
12/15/2017 1/04/2018 7:00 AM 21 0.21 M M Post holiday reading. Mr H
1/7/2018 1/08/2018 7:00 AM 2 M M M
1/12/2018 1/16/2018 8:53 AM 5 0.09 M M Nice long weekend. Gauge was frozen so it had to thaw. Brigid Mead
1/27/2018 1/29/2018 7:00 AM 3 T M M Frost covered gauge. Mr. H
2/10/2018 2/12/2018 7:30 AM 3 0.12 0.8 M Water completely frozen in the tube
2/24/2018 2/26/2018 8:20 AM 3 0.02 M M Brisk outside, bright and amazing sunrise. - Davin
3/10/2018 3/12/2018 7:45 AM 3 0.00 0.0 0.00 Their was no changes during the weekend no more snow.Brayan
3/23/2018 4/02/2018 7:00 AM 11 0.83 M M Back from spring break a lot of rain and some snow
4/7/2018 4/09/2018 7:41 AM 3 0.15 M M Light amount of snow during time of recording. -drake morgan block 5
4/14/2018 4/16/2018 7:38 AM 3 0.00 M M Several bugs in gauge. Warm morning. Brigid M
4/21/2018 4/23/2018 7:31 AM 3 0.36 M M Lots of condensation on containers. Very wet ground. -Drake Morgan Block 5
4/26/2018 5/01/2018 7:30 AM 6 0.00 M M Grey clouds. Chilly. -Drake m block 5
5/12/2018 5/14/2018 7:00 AM 3 1.68 M M wet, cloudy, cold. MrH
5/20/2018 5/21/2018 7:30 AM 2 1.35 M M Dewy, partly cloudy
8/31/2018 9/04/2018 7:00 AM 5 0.08 M M cool, overcast, bugs in rain gauge. MrH
9/3/2018 9/04/2018 7:00 AM 2 0.08 M M Cool out, overcast, bugs in the rain gauge
9/4/2018 9/06/2018 7:00 AM 3 0.81 M M Tuesday night rainstorm, today is cool, cloudy and dew on grass. MrH
9/7/2018 9/10/2018 7:00 AM 4 0.16 M M cool, clear, spider in gauge. MrH
9/10/2018 9/12/2018 7:00 AM 3 0.00 M M warm, dry and clear MrH
9/15/2018 9/18/2018 7:00 AM 4 0.01 M M cool, clear, minimal water in gauge. MrH
9/19/2018 9/20/2018 7:00 AM 2 0.17 M M warm, overcast, damp. MrH
9/29/2018 10/01/2018 7:00 AM 3 0.02 M M Cool, overcast and damp. MrH



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