Station Overview Station Location
Station Number CO-BO-479 Latitude 40.108589
Station Name Niwot 1.0 NNE Longitude -105.146366
County Boulder Elevation (ft) 5045



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 1.49 25 1.49 25 0.00 0 0 6 0 0.0 0 0
Nov 17 0.84 0.09 21 0.09 21 0.00 0 0 4 1 0.0 0 0
Dec 17 0.58 0.00 15 0.00 15 0.00 0 0 0 0 0.0 0 0
Jan 18 0.43 0.00 14 0.00 14 0.00 0 0 0 0 0.0 0 0
Feb 18 0.50 0.00 1 0.00 1 0.00 0 0 0 0 0.0 0 0
March 18 1.54 0.00 1 0.00 1 0.00 0 0 0 0 0.0 0 0
April 18 1.85 0.83 8 0.83 8 0.00 0 0 4 0 0.0 0 0
May 18 2.32 4.39 22 2.99 18 1.40 4 1 10 1 0.0 0 0
June 18 1.80 2.39 18 0.19 14 2.20 4 1 3 0 0.0 0 0
July 18 1.32 1.86 27 1.86 27 0.00 0 0 8 2 0.0 0 0
Aug 18 1.39 0.64 27 0.59 22 0.05 5 1 4 3 0.0 0 0
Sept 18 1.45 0.73 21 0.73 21 0.00 0 0 3 4 0.0 0 0
Water Year Totals: 15.04" 12.42" 200 days 8.77" 187 3.65" 13 days 3 42 days 11 days 0.0" 0 days 0 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 0.03
10/2/2017 0.74
10/3/2017 0.41
10/4/2017
10/5/2017
10/6/2017 0.00
10/7/2017 0.00
10/8/2017 0.00
10/9/2017 0.27
10/10/2017 0.00
10/11/2017 0.00
10/12/2017 0.00
10/13/2017
10/14/2017 0.00
10/15/2017
10/16/2017 0.00
10/17/2017
10/18/2017 0.00
10/19/2017
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 0.03
10/28/2017 0.00
10/29/2017 0.00
10/30/2017 0.01
10/31/2017 0.00
11/1/2017 0.05
11/2/2017 0.00
11/3/2017 0.00
11/4/2017 0.00
11/5/2017 0.02
11/6/2017 0.01
11/7/2017
11/8/2017
11/9/2017
11/10/2017 0.00
11/11/2017
11/12/2017 0.00
11/13/2017 0.00
11/14/2017 0.00
11/15/2017 0.00
11/16/2017
11/17/2017 0.00
11/18/2017
11/19/2017 0.00
11/20/2017
11/21/2017 0.00
11/22/2017 0.01
11/23/2017 0.00
11/24/2017 0.00
11/25/2017
11/26/2017 0.00
11/27/2017 0.00
11/28/2017
11/29/2017 T
11/30/2017 0.00
12/1/2017
12/2/2017
12/3/2017 0.00
12/4/2017 0.00
12/5/2017
12/6/2017
12/7/2017
12/8/2017 0.00
12/9/2017 0.00
12/10/2017 0.00
12/11/2017
12/12/2017
12/13/2017 0.00
12/14/2017
12/15/2017
12/16/2017 0.00
12/17/2017
12/18/2017
12/19/2017
12/20/2017
12/21/2017
12/22/2017 0.00
12/23/2017 0.00
12/24/2017
12/25/2017 0.00
12/26/2017 0.00
12/27/2017 0.00
12/28/2017
12/29/2017 0.00
12/30/2017 0.00
12/31/2017 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2018 0.00
1/2/2018 0.00
1/3/2018 0.00
1/4/2018
1/5/2018
1/6/2018 0.00
1/7/2018 0.00
1/8/2018
1/9/2018
1/10/2018
1/11/2018 0.00
1/12/2018 0.00
1/13/2018 0.00
1/14/2018 0.00
1/15/2018 0.00
1/16/2018
1/17/2018 0.00
1/18/2018 0.00
1/19/2018 0.00
1/20/2018
1/21/2018
1/22/2018
1/23/2018 0.00
1/24/2018
1/25/2018
1/26/2018
1/27/2018
1/28/2018
1/29/2018
1/30/2018
1/31/2018
2/1/2018
2/2/2018
2/3/2018
2/4/2018
2/5/2018
2/6/2018
2/7/2018
2/8/2018
2/9/2018 0.00
2/10/2018
2/11/2018
2/12/2018
2/13/2018
2/14/2018
2/15/2018
2/16/2018
2/17/2018
2/18/2018
2/19/2018
2/20/2018
2/21/2018
2/22/2018
2/23/2018
2/24/2018
2/25/2018
2/26/2018
2/27/2018
2/28/2018
3/1/2018
3/2/2018
3/3/2018
3/4/2018
3/5/2018
3/6/2018
3/7/2018
3/8/2018
3/9/2018
3/10/2018
3/11/2018
3/12/2018
3/13/2018
3/14/2018
3/15/2018
3/16/2018
3/17/2018
3/18/2018
3/19/2018
3/20/2018
3/21/2018
3/22/2018
3/23/2018 0.00
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
4/3/2018
4/4/2018
4/5/2018
4/6/2018
4/7/2018
4/8/2018
4/9/2018
4/10/2018
4/11/2018
4/12/2018
4/13/2018
4/14/2018
4/15/2018
4/16/2018
4/17/2018
4/18/2018
4/19/2018
4/20/2018
4/21/2018 0.10
4/22/2018 0.28
4/23/2018
4/24/2018 0.19
4/25/2018 0.26
4/26/2018
4/27/2018 0.00
4/28/2018 0.00
4/29/2018 0.00
4/30/2018 0.00
5/1/2018 **
5/2/2018 **
5/3/2018 **
5/4/2018 1.40
5/5/2018
5/6/2018
5/7/2018
5/8/2018
5/9/2018 0.00
5/10/2018
5/11/2018
5/12/2018 0.06
5/13/2018 0.28
5/14/2018 1.04
5/15/2018 T
5/16/2018 0.00
5/17/2018
5/18/2018 0.00
5/19/2018 1.23
5/20/2018 0.08
5/21/2018 0.05
5/22/2018 0.00
5/23/2018 0.16
5/24/2018
5/25/2018 0.02
5/26/2018
5/27/2018 0.00
5/28/2018 0.00
5/29/2018 0.05
5/30/2018 0.00
5/31/2018 0.02
6/1/2018 0.00
6/2/2018 0.00
6/3/2018
6/4/2018
6/5/2018 0.00
6/6/2018 0.00
6/7/2018 0.00
6/8/2018
6/9/2018 0.00
6/10/2018
6/11/2018
6/12/2018
6/13/2018 0.00
6/14/2018 0.00
6/15/2018
6/16/2018 0.01
6/17/2018 **
6/18/2018 **
6/19/2018 **
6/20/2018 2.20
6/21/2018 0.00
6/22/2018 0.01
6/23/2018
6/24/2018
6/25/2018 0.17
6/26/2018
6/27/2018
6/28/2018
6/29/2018 0.00
6/30/2018 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2018 0.02
7/2/2018 0.00
7/3/2018 0.00
7/4/2018 0.00
7/5/2018 0.00
7/6/2018 0.00
7/7/2018 0.00
7/8/2018
7/9/2018 0.00
7/10/2018
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 0.20
7/17/2018 0.00
7/18/2018 T
7/19/2018 0.00
7/20/2018 0.00
7/21/2018 0.00
7/22/2018 0.00
7/23/2018 0.02
7/24/2018 0.67
7/25/2018 T
7/26/2018 0.85
7/27/2018 0.06
7/28/2018 0.01
7/29/2018 0.03
7/30/2018
7/31/2018
8/1/2018 0.00
8/2/2018 **
8/3/2018 **
8/4/2018 **
8/5/2018 **
8/6/2018 0.05
8/7/2018 T
8/8/2018 0.00
8/9/2018 0.00
8/10/2018 0.00
8/11/2018
8/12/2018 0.00
8/13/2018 0.00
8/14/2018 0.00
8/15/2018 0.28
8/16/2018
8/17/2018 0.00
8/18/2018 0.00
8/19/2018 0.29
8/20/2018 0.01
8/21/2018
8/22/2018 T
8/23/2018 0.01
8/24/2018 0.00
8/25/2018
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
9/2/2018 T
9/3/2018
9/4/2018 0.00
9/5/2018 0.68
9/6/2018 0.01
9/7/2018 T
9/8/2018 T
9/9/2018 0.00
9/10/2018
9/11/2018
9/12/2018 0.00
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 0.04
9/21/2018 0.00
9/22/2018 0.00
9/23/2018
9/24/2018 0.00
9/25/2018 T
9/26/2018
9/27/2018
9/28/2018
9/29/2018 0.00
9/30/2018



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2017 8:00 AM 0.03 M M M M
10/2/2017 7:00 AM 0.74 M M M M
10/3/2017 7:00 AM 0.41 M M M M
10/6/2017 7:00 AM 0.00 0.0 M M M
10/7/2017 7:00 AM 0.00 0.0 M M M
10/8/2017 7:00 AM 0.00 0.0 M M M
10/9/2017 7:35 AM 0.27 M M M M Rain started at approx. 8pm on 10/8 and changed over to snow sometime overnight.
10/10/2017 7:00 AM 0.00 0.0 M M M
10/11/2017 8:00 AM 0.00 0.0 M M M
10/12/2017 7:00 AM 0.00 0.0 M M M
10/14/2017 7:00 AM 0.00 0.0 M M M
10/16/2017 8:00 AM 0.00 0.0 M M M
10/18/2017 7:00 AM 0.00 0.0 M M M
10/20/2017 7:00 AM 0.00 0.0 M M M
10/21/2017 7:00 AM 0.00 0.0 M M M
10/22/2017 7:00 AM 0.00 0.0 M M M
10/23/2017 7:00 AM 0.00 0.0 M M M
10/24/2017 7:00 AM 0.00 0.0 M M M
10/25/2017 7:00 AM 0.00 0.0 M M M
10/26/2017 7:00 AM 0.00 0.0 M M M
10/27/2017 7:00 AM 0.03 M M M M
10/28/2017 7:00 AM 0.00 0.0 M M M
10/29/2017 7:00 AM 0.00 0.0 M M M
10/30/2017 7:15 AM 0.01 M M M M Freezing drizzle
10/31/2017 7:00 AM 0.00 0.0 M M M
11/1/2017 7:00 AM 0.05 M M M M Melted snow
11/2/2017 7:00 AM 0.00 0.0 M M M
11/3/2017 7:00 AM 0.00 0.0 M M M
11/4/2017 7:00 AM 0.00 0.0 M M M
11/5/2017 7:00 AM 0.02 M M M M Not sure if moisture fell as rain or snow. Was rain/drizzle at 7am. Moisture collected in the large cylinder (without inner measurer or cap) and measured with inner cylinder.
11/6/2017 7:00 AM 0.01 M M M M
11/10/2017 7:00 AM 0.00 0.0 M M M
11/12/2017 7:00 AM 0.00 0.0 M M M
11/13/2017 7:00 AM 0.00 0.0 M M M
11/14/2017 7:00 AM 0.00 0.0 M M M
11/15/2017 7:00 AM 0.00 0.0 M M M
11/17/2017 7:00 AM 0.00 0.0 M M M
11/19/2017 7:00 AM 0.00 0.0 M M M
11/21/2017 7:00 AM 0.00 0.0 M M M
11/22/2017 7:00 AM 0.01 M M M M
11/23/2017 7:00 AM 0.00 0.0 M M M
11/24/2017 7:00 AM 0.00 0.0 M M M
11/26/2017 7:00 AM 0.00 0.0 M M M
11/27/2017 7:00 AM 0.00 0.0 M M M
11/29/2017 7:00 AM T M M M M
11/30/2017 7:00 AM 0.00 0.0 M M M
12/3/2017 7:00 AM 0.00 0.0 M M M
12/4/2017 7:00 AM 0.00 0.0 M M M
12/8/2017 7:00 AM 0.00 0.0 M M M
12/9/2017 7:00 AM 0.00 0.0 M M M
12/10/2017 7:00 AM 0.00 0.0 M M M
12/13/2017 7:00 AM 0.00 0.0 M M M
12/16/2017 7:00 AM 0.00 0.0 M M M
12/22/2017 7:00 AM 0.00 0.0 M M M
12/23/2017 7:00 AM 0.00 0.0 M M M
12/25/2017 7:00 AM 0.00 0.0 M M M
12/26/2017 7:00 AM 0.00 0.0 M M M very light snow starting at 7:15am
12/27/2017 7:00 AM 0.00 0.0 M M M
12/29/2017 7:00 AM 0.00 0.0 M M M
12/30/2017 7:00 AM 0.00 0.0 M M M Very slight dusting of snow.
12/31/2017 7:00 AM 0.00 0.0 M M M Very light snow falling at 7am.
1/1/2018 7:00 AM 0.00 0.0 M M M
1/2/2018 7:00 AM 0.00 0.0 M M M
1/3/2018 7:00 AM 0.00 0.0 M M M
1/6/2018 7:00 AM 0.00 0.0 M M M
1/7/2018 7:00 AM 0.00 0.0 M M M
1/11/2018 7:00 AM 0.00 0.0 M M M Rain fell during the day on 1/10. Inner cylinder wasn't installed in rain gauge, but a secondary automated gauge recorded 0.00, so a trace of rain at best.
1/12/2018 7:00 AM 0.00 0.0 M M M
1/13/2018 7:00 AM 0.00 0.0 M M M
1/14/2018 7:00 AM 0.00 0.0 M M M
1/15/2018 7:00 AM 0.00 0.0 M M M Very light snow at 7am with no more than a light dusting on the ground. By 8:30 moderate snow falling with approximately 1/2" on the ground.
1/17/2018 7:00 AM 0.00 0.0 M M M
1/18/2018 7:00 AM 0.00 0.0 M M M
1/19/2018 7:00 AM 0.00 0.0 M M M
1/23/2018 7:00 AM 0.00 0.0 M M M
2/9/2018 7:00 AM 0.00 0.0 M M M
3/23/2018 7:00 AM 0.00 0.0 M M M
4/21/2018 7:00 AM 0.10 M M M M Mostly snow falling at 7:00am with about 1" on grassy surfaces.
4/22/2018 7:00 AM 0.28 M M M M
4/24/2018 7:45 AM 0.19 M M M M
4/25/2018 8:00 AM 0.26 M M M M
4/27/2018 7:00 AM 0.00 0.0 M M M
4/28/2018 7:00 AM 0.00 0.0 M M M
4/29/2018 7:00 AM 0.00 0.0 M M M
4/30/2018 7:00 AM 0.00 0.0 M M M
5/9/2018 7:00 AM 0.00 0.0 M M M
5/12/2018 7:00 AM 0.06 M M M M
5/13/2018 7:30 AM 0.28 M M M M
5/14/2018 7:00 AM 1.04 M M M M Not sure I've seen such continual and consistent lightning, for so long, as I did from about 8pm-9:30. There didn't seem to be more than 1-2 seconds during that period where I didn't see and/or hear it. We also had 2-3 periods of short, pea sized hail maybe lasting a few minutes each, with no accumulation.
5/15/2018 7:00 AM T M M M M
5/16/2018 7:00 AM 0.00 0.0 M M M
5/18/2018 7:00 AM 0.00 0.0 M M M
5/19/2018 7:00 AM 1.23 M M M M
5/20/2018 7:30 AM 0.08 M M M M
5/21/2018 7:00 AM 0.05 M M M M
5/22/2018 7:00 AM 0.00 0.0 M M M
5/23/2018 7:00 AM 0.16 M M M M
5/25/2018 7:00 AM 0.02 M 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 7:30 AM 0.05 M M M M
5/30/2018 7:00 AM 0.00 0.0 M M M
5/31/2018 7:25 AM 0.02 M M M M
6/1/2018 7:00 AM 0.00 0.0 M M M
6/2/2018 6:30 AM 0.00 0.0 M M M
6/5/2018 7:00 AM 0.00 0.0 M M M
6/6/2018 7:00 AM 0.00 0.0 M M M
6/7/2018 7:00 AM 0.00 0.0 M M M
6/9/2018 7:00 AM 0.00 0.0 M M M
6/13/2018 7:00 AM 0.00 0.0 M M M
6/14/2018 7:00 AM 0.00 0.0 M M M
6/16/2018 7:45 AM 0.01 M M M M
6/21/2018 7:15 AM 0.00 0.0 M M M
6/22/2018 7:45 AM 0.01 M M M M
6/25/2018 6:45 AM 0.17 M M M M
6/29/2018 7:00 AM 0.00 0.0 M M M
6/30/2018 7:00 AM 0.00 0.0 M M M
7/1/2018 7:00 AM 0.02 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 7:22 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 0.00 0.0 M M M
7/7/2018 7:00 AM 0.00 0.0 M M M
7/9/2018 7:00 AM 0.00 0.0 M M M
7/11/2018 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 6:22 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 0.20 M M M M
7/17/2018 7:00 AM 0.00 0.0 M M M
7/18/2018 7:00 AM T M M M M
7/19/2018 7:00 AM 0.00 0.0 M M M
7/20/2018 7:30 AM 0.00 0.0 M M M
7/21/2018 7:00 AM 0.00 0.0 M M M
7/22/2018 7:00 AM 0.00 0.0 M M M
7/23/2018 7:10 AM 0.02 M M M M
7/24/2018 7:00 AM 0.67 M M M M
7/25/2018 7:30 AM T M M M M
7/26/2018 7:00 AM 0.85 M M M M Rain started around 5pm 7/25 and ended approximately at 7pm. Around .4" at that point but another cell moved through around 2am 7/26 dropping another .45". Not sure the duration of that rain event.
7/27/2018 7:00 AM 0.06 M M M M
7/28/2018 7:15 AM 0.01 M M M M
7/29/2018 7:00 AM 0.03 M M M M
8/1/2018 7:00 AM 0.00 0.0 M M M
8/7/2018 7:00 AM T 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
8/12/2018 7:00 AM 0.00 0.0 M M M
8/13/2018 6:35 AM 0.00 0.0 M M M
8/14/2018 7:00 AM 0.00 0.0 M M M
8/15/2018 7:15 AM 0.28 M M M M
8/17/2018 7:00 AM 0.00 0.0 M M M
8/18/2018 7:00 AM 0.00 0.0 M M M
8/19/2018 7:10 AM 0.29 M M M M All but .02 fell with the storm that rolled though starting around 9:30pm Unbelievable amounts of lightning. The .02" of rain fell in the morning of 8/18 - around 11am or so.
8/20/2018 9:30 AM 0.01 M M M M
8/22/2018 7:20 AM T M M M M
8/23/2018 7:00 AM 0.01 M M M M
8/24/2018 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 T M M M M
8/28/2018 7:00 AM 0.00 0.0 M M M
8/29/2018 6:50 AM 0.00 0.0 M M M
8/30/2018 7:00 AM 0.00 0.0 M M M
8/31/2018 6:45 AM 0.00 0.0 M M M
9/2/2018 7:00 AM T M M M M
9/4/2018 6:45 AM 0.00 0.0 M M M
9/5/2018 7:00 AM 0.68 M M M M
9/6/2018 7:00 AM 0.01 M M M M
9/7/2018 7:00 AM T M M M M
9/8/2018 7:00 AM T M M M M
9/9/2018 8:00 AM 0.00 0.0 M M M
9/12/2018 7:00 AM 0.00 0.0 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 0.00 0.0 M M M
9/19/2018 7:00 AM 0.00 0.0 M M M
9/20/2018 7:00 AM 0.04 M M M M
9/21/2018 7:00 AM 0.00 0.0 M M M
9/22/2018 7:45 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
9/29/2018 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
5/1/2018 5/04/2018 7:00 AM 4 1.40 M M
6/17/2018 6/20/2018 7:00 AM 4 2.20 M M
8/2/2018 8/06/2018 7:00 AM 5 0.05 M M



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