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 14 1.02 1.14 26 1.03 13 0.11 13 4 7 0 0.0 0 0
Nov 14 0.85 0.24 6 0.16 3 0.08 3 1 1 0 0.0 0 0
Dec 14 0.58 0.00 7 0.00 2 0.00 5 1 0 0 0.0 0 0
Jan 15 0.42 0.12 19 0.12 13 0.00 6 2 6 0 0.0 0 0
Feb 15 0.50 0.68 16 0.67 13 0.01 3 1 6 0 1.5 1 0
March 15 1.55 0.56 24 0.44 13 0.12 11 4 6 0 2.0 1 2
April 15 1.85 2.01 25 1.22 11 0.79 14 3 4 0 0.0 0 0
May 15 2.33 5.16 10 4.06 3 1.10 7 2 3 0 0.0 0 0
June 15 1.79 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
July 15 1.32 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Aug 15 1.37 0.64 12 0.49 5 0.15 7 2 3 0 0.0 0 0
Sept 15 1.45 0.76 34 0.46 18 0.30 16 5 7 1 0.0 0 0
Water Year Totals: 15.03" 11.31" 179 days 8.65" 94 2.66" 85 days 25 43 days 1 days 3.5" 2 days 2 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
10/1/2014 **
10/2/2014 0.10
10/3/2014 0.01
10/4/2014 **
10/5/2014 **
10/6/2014 0.00
10/7/2014 0.00
10/8/2014 0.00
10/9/2014 0.01
10/10/2014 0.95
10/11/2014 **
10/12/2014 **
10/13/2014 0.00 **
10/14/2014 0.00
10/15/2014 0.00
10/16/2014
10/17/2014
10/18/2014
10/19/2014
10/20/2014
10/21/2014 0.01
10/22/2014 0.01
10/23/2014 0.01
10/24/2014 0.00
10/25/2014 **
10/26/2014 **
10/27/2014 0.01
10/28/2014 0.03
10/29/2014 0.00
10/30/2014
10/31/2014 **
11/1/2014 **
11/2/2014 **
11/3/2014 0.08
11/4/2014
11/5/2014
11/6/2014
11/7/2014 0.00
11/8/2014
11/9/2014
11/10/2014
11/11/2014
11/12/2014
11/13/2014 0.16
11/14/2014
11/15/2014
11/16/2014
11/17/2014
11/18/2014
11/19/2014
11/20/2014
11/21/2014 0.00
11/22/2014
11/23/2014
11/24/2014
11/25/2014
11/26/2014
11/27/2014
11/28/2014
11/29/2014
11/30/2014
12/1/2014
12/2/2014
12/3/2014
12/4/2014
12/5/2014 0.00 **
12/6/2014 **
12/7/2014 **
12/8/2014 **
12/9/2014 0.00
12/10/2014
12/11/2014
12/12/2014
12/13/2014
12/14/2014
12/15/2014
12/16/2014 0.00
12/17/2014
12/18/2014
12/19/2014
12/20/2014
12/21/2014
12/22/2014
12/23/2014
12/24/2014
12/25/2014
12/26/2014
12/27/2014
12/28/2014
12/29/2014
12/30/2014
12/31/2014
Day of YearDaily PrcpMultiday Prcp
1/1/2015
1/2/2015
1/3/2015
1/4/2015
1/5/2015
1/6/2015 0.01
1/7/2015 0.02
1/8/2015 0.02
1/9/2015 0.02
1/10/2015
1/11/2015
1/12/2015
1/13/2015
1/14/2015 0.01
1/15/2015
1/16/2015 0.00
1/17/2015 **
1/18/2015 **
1/19/2015 0.00
1/20/2015 0.00
1/21/2015 0.00
1/22/2015 0.04
1/23/2015 0.00
1/24/2015 **
1/25/2015 **
1/26/2015 0.00
1/27/2015
1/28/2015 0.00
1/29/2015 0.00
1/30/2015 0.00
1/31/2015
2/1/2015
2/2/2015
2/3/2015 0.01
2/4/2015 0.15
2/5/2015 0.01
2/6/2015 **
2/7/2015 **
2/8/2015 0.01
2/9/2015 0.00
2/10/2015 0.00
2/11/2015 0.00
2/12/2015 0.00
2/13/2015 0.00
2/14/2015
2/15/2015
2/16/2015
2/17/2015 0.19
2/18/2015 0.02
2/19/2015 0.00
2/20/2015 0.00
2/21/2015
2/22/2015
2/23/2015
2/24/2015 0.29
2/25/2015
2/26/2015
2/27/2015
2/28/2015
3/1/2015 **
3/2/2015 0.12
3/3/2015 0.11
3/4/2015 0.11
3/5/2015
3/6/2015
3/7/2015
3/8/2015
3/9/2015 0.03
3/10/2015 0.00
3/11/2015 0.00
3/12/2015 0.00
3/13/2015 0.00
3/14/2015 **
3/15/2015 **
3/16/2015 0.00
3/17/2015 0.00
3/18/2015
3/19/2015 0.06
3/20/2015
3/21/2015 **
3/22/2015 **
3/23/2015 0.00
3/24/2015 0.00
3/25/2015 0.01
3/26/2015 0.12
3/27/2015 M
3/28/2015 **
3/29/2015 **
3/30/2015 0.00
3/31/2015 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2015
4/2/2015 0.00
4/3/2015
4/4/2015
4/5/2015
4/6/2015 **
4/7/2015 **
4/8/2015 **
4/9/2015 **
4/10/2015 **
4/11/2015 **
4/12/2015 0.00 **
4/13/2015 0.00 0.00
4/14/2015 0.00
4/15/2015 0.00
4/16/2015 0.00
4/17/2015 1.11
4/18/2015
4/19/2015
4/20/2015
4/21/2015 0.09
4/22/2015 0.00
4/23/2015 0.01
4/24/2015 0.01
4/25/2015 **
4/26/2015 **
4/27/2015 0.62
4/28/2015
4/29/2015
4/30/2015
5/1/2015 **
5/2/2015 **
5/3/2015 **
5/4/2015 0.32
5/5/2015
5/6/2015 0.22 **
5/7/2015 **
5/8/2015 0.78
5/9/2015
5/10/2015 3.00
5/11/2015
5/12/2015
5/13/2015
5/14/2015
5/15/2015
5/16/2015
5/17/2015
5/18/2015
5/19/2015 0.84
5/20/2015
5/21/2015
5/22/2015
5/23/2015
5/24/2015
5/25/2015
5/26/2015
5/27/2015
5/28/2015
5/29/2015
5/30/2015
5/31/2015
6/1/2015
6/2/2015
6/3/2015
6/4/2015
6/5/2015
6/6/2015
6/7/2015
6/8/2015
6/9/2015
6/10/2015
6/11/2015
6/12/2015
6/13/2015
6/14/2015
6/15/2015
6/16/2015
6/17/2015
6/18/2015
6/19/2015
6/20/2015
6/21/2015
6/22/2015
6/23/2015
6/24/2015
6/25/2015
6/26/2015
6/27/2015
6/28/2015
6/29/2015
6/30/2015
Day of YearDaily PrcpMultiday Prcp
7/1/2015
7/2/2015
7/3/2015
7/4/2015
7/5/2015
7/6/2015
7/7/2015
7/8/2015
7/9/2015
7/10/2015
7/11/2015
7/12/2015
7/13/2015
7/14/2015
7/15/2015
7/16/2015
7/17/2015
7/18/2015
7/19/2015
7/20/2015
7/21/2015
7/22/2015
7/23/2015
7/24/2015
7/25/2015
7/26/2015
7/27/2015
7/28/2015
7/29/2015
7/30/2015
7/31/2015
8/1/2015
8/2/2015
8/3/2015
8/4/2015
8/5/2015
8/6/2015
8/7/2015
8/8/2015
8/9/2015
8/10/2015
8/11/2015
8/12/2015
8/13/2015
8/14/2015
8/15/2015
8/16/2015
8/17/2015
8/18/2015
8/19/2015
8/20/2015
8/21/2015 0.00
8/22/2015
8/23/2015
8/24/2015
8/25/2015
8/26/2015 0.00
8/27/2015 0.09
8/28/2015 0.30 **
8/29/2015 **
8/30/2015 **
8/31/2015 0.10 0.05
9/1/2015 T **
9/2/2015 0.01 **
9/3/2015 0.02 T
9/4/2015 0.06
9/5/2015 **
9/6/2015 **
9/7/2015 **
9/8/2015 0.15
9/9/2015 0.21
9/10/2015 0.00
9/11/2015 0.00
9/12/2015 **
9/13/2015 **
9/14/2015 0.00
9/15/2015 0.00
9/16/2015 0.00
9/17/2015 0.05
9/18/2015 0.00
9/19/2015 **
9/20/2015 **
9/21/2015 M 0.15
9/22/2015 0.00
9/23/2015 0.00
9/24/2015 0.00
9/25/2015 0.00
9/26/2015 **
9/27/2015 **
9/28/2015 0.00 0.00
9/29/2015 0.06
9/30/2015 0.05



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/3/2014 8:30 AM 0.01 M M M M
10/7/2014 8:00 AM 0.00 0.0 M M M
10/8/2014 7:00 AM 0.00 0.0 M M M
10/9/2014 8:00 AM 0.01 M M M M
10/10/2014 7:15 AM 0.95 M M M M Crack in gauge leaks, inhibits full reading
10/13/2014 8:30 AM 0.00 0.0 M M M
10/15/2014 8:00 AM 0.00 0.0 M M M
10/21/2014 9:00 AM 0.01 M M M M Gauge caked in dirt
10/22/2014 7:00 AM 0.01 M M M M Cold, sunny
10/23/2014 7:10 AM 0.01 M M M M Bug in gauge
10/24/2014 9:30 AM 0.00 0.0 M M M Warm
10/28/2014 7:00 AM 0.03 M M M M Cold -- light rain last night
10/29/2014 7:15 AM 0.00 0.0 M M M Leaf in gauge
11/7/2014 7:00 AM 0.00 0.0 M M M Cloudy morning, but fairly warm.
11/13/2014 8:50 AM 0.16 M M M M Snow
11/21/2014 8:55 AM 0.00 0.0 M M M Clear skies
12/5/2014 7:20 AM 0.00 0.0 M M M No precipitation. No wind. Partially cloudy.
12/16/2014 7:00 AM 0.00 0.0 M M M Cool temperature out. (Read by Sophie H)
1/6/2015 7:00 AM 0.01 M M M M Cold with slight overcast
1/7/2015 7:00 AM 0.02 M M M M Cloudy with slight flurries of snow.
1/8/2015 1:00 PM 0.02 M M M M Mostly Cloudy, lite snowfall in afternoon, temp around 45 degrees read by Ellie.
1/9/2015 7:00 AM 0.02 M M M M dark, cloudy, hoare frost on side of gauge, read by Rocky
1/14/2015 7:00 AM 0.01 0.0 M M M CleAR sky and there is snow still on the ground
1/16/2015 11:55 AM 0.00 0.0 M M M Dry dirt lining bottom of gauge
1/20/2015 7:00 AM 0.00 0.0 M M M Clear sky dry windy - cameron
1/21/2015 7:00 AM 0.00 0.0 M M M Gauge bone dry, dark cloudy sky, it has just begun to snow, observed by Rocky
1/22/2015 7:00 AM 0.04 M M M M Clear skies, snow on ground, value reflects melted snow, observed by Lord Rocky
1/23/2015 7:00 AM 0.00 0.0 M M M Gauge dry, semi-clear skies, snow still on ground from yesterday, observed by Rocky and Melissa
1/28/2015 7:00 AM 0.00 0.0 M M M Clear sky's and very windy
1/29/2015 7:00 AM 0.00 0.0 M M M overcast
1/30/2015 7:00 AM 0.00 0.0 M M M Clear skys
2/3/2015 7:00 AM 0.01 M M M M cold,
2/4/2015 7:00 AM 0.15 1.5 M M M cold, windy, snowing, Rocky read the gauge
2/5/2015 7:00 AM 0.01 M M M M Day after snow storm, snow and mild winds, very very cold.
2/9/2015 7:00 AM 0.00 M M M M fairly warm
2/10/2015 7:00 AM 0.00 0.0 M M M Clear skies, warm weather, observed by Rocky
2/11/2015 7:00 AM 0.00 0.0 M M M Minimal condensation on the outside of gauge,cloudy sky, observed by Rocky
2/12/2015 7:00 AM 0.00 0.0 M M M Warm, pretty clear, few clouds
2/13/2015 7:00 AM 0.00 0.0 M M M Clear skies, observed by Rocky
2/17/2015 7:00 AM 0.19 M M M M (Morganne Gau) Sunny, snow on ground
2/18/2015 7:00 AM 0.02 M M M M There was ice in the gauge, snow on the ground, cold - cameron
2/19/2015 7:00 AM 0.00 0.0 M M M Clear skies, sunny, observed by Rocky
2/20/2015 7:00 AM 0.00 0.0 M M M Clear skies,sunny,gauge dry as bones, witnessed by local scientific observer, Rocky
2/24/2015 7:00 AM 0.29 M M M M Measurement reflects snowmelt, not all ofcompletely melted, brought in by Drake + measured by Rocky
3/3/2015 7:00 AM 0.11 M M 4.0 M Cold temperatures, but some snow gone
3/4/2015 7:00 AM 0.11 2.0 M 6.0 M New snow from overnight
3/9/2015 7:00 AM 0.03 M M M M Chilly with some snow on the ground. -Steven
3/10/2015 7:00 AM 0.00 0.0 M M M Clear skies, warmer temperature, observed by Rocky
3/11/2015 7:00 AM 0.00 0.0 M M M Clear skies, sun and moon visible
3/12/2015 7:00 AM 0.00 0.0 M M M Sunny, bone dry
3/13/2015 7:00 AM 0.00 0.0 M M M Sunny weather, dry gauge
3/17/2015 7:00 AM 0.00 0.0 M M M Cloudy and cold
3/19/2015 7:00 AM 0.06 M M M M Cloudy skies, lots of moisture, slight rain -Steven
3/24/2015 7:00 AM 0.00 0.0 M M M Cloudy and windy, but dry gauge/weather
3/25/2015 7:00 AM 0.01 M M M M Light sprinkle
3/26/2015 7:00 AM 0.12 0.0 M M M precipitation overnight, few clouds
3/27/2015 7:00 AM M M M M M Few clouds (Edit: Observer initially recorded 0.07" of precip. This is anomalously high for the region. Possible multi-day report. Changed precip to NA. Observer will be contacted. M.W.)
3/31/2015 7:00 AM 0.00 0.0 M M M Clear sky
4/2/2015 7:00 AM 0.00 0.0 M M M Three small insects- Drake and Cam
4/12/2015 7:00 AM 0.00 0.0 M M M Bright morning, clear sky
4/13/2015 7:00 AM 0.00 0.0 M M M Clear blue sky, slight breeze, warm temperate
4/14/2015 7:00 AM 0.00 0.0 M M M Windy, but cold
4/15/2015 7:00 AM 0.00 0.0 M M M Slightly cold and cloudy, dry weather
4/16/2015 7:00 AM 0.00 0.0 M M M No snow landed in or on rain gauge. No precipitation.
4/17/2015 7:00 AM 1.11 M M M M Clouds,constant rain, sometimes quick hail storms.
4/21/2015 7:00 AM 0.09 M M M M There was water In side of the rain gage holder (Edit: Observer initially recorded 0.94" of precip. This is anomalously high for the region. Possible multi-day or incorrect measurement. Changed precip to NA. Observer will be contacted. M.W.)
4/22/2015 7:00 AM 0.00 0.0 M M M Chilly morning, slight breeze, empty gauge
4/23/2015 7:00 AM 0.01 M M M M There was some condensation in the container- Cameron
4/24/2015 7:00 AM 0.01 M M M M Looks like it's about to rain, very cloudy
5/6/2015 12:40 PM 0.22 M M M M Bug in gauge
5/10/2015 7:00 AM 3.00 M M M M Sleat 36º
5/19/2015 7:00 AM 0.84 M M M M 2 Mosquitos in gauge, heavy rain
8/21/2015 7:00 AM 0.00 0.0 M M M
8/26/2015 7:00 AM 0.00 0.0 M M M
8/27/2015 7:00 AM 0.09 M M M M cool and cloudy
8/28/2015 9:00 AM 0.30 M M M M Mild and cloudy, no wind
8/31/2015 7:00 AM 0.10 M M M M Cloudy, warm temp, slight rain. -Sam Biles
9/1/2015 8:00 AM T M M M M Warm, sunny, no clouds. -Sam Biles
9/2/2015 9:00 AM 0.01 M M M M Clear, warm and no wind. Mr. Hollins
9/3/2015 7:00 AM 0.02 M M M M Cloudy, warm -Sam Biles
9/4/2015 6:55 AM 0.06 0.0 M M M Cool, light sun, not many clouds -Emily C.
9/9/2015 7:00 AM 0.21 M M M M
9/10/2015 7:00 AM 0.00 0.0 M M M Sunny, warm, not cloudy
9/11/2015 7:00 AM 0.00 0.0 M M M eric Fraley block 1
9/15/2015 7:12 AM 0.00 0.0 M M M theres some sort of dead bug in there. Light wind and overcast.
9/16/2015 9:00 AM 0.00 0.0 M M M Partly cloud and slight breeze.
9/17/2015 7:00 AM 0.05 M M M M sunny with few clouds in the sky. -chase balman
9/18/2015 7:00 AM 0.00 0.0 M M M sunny
9/21/2015 7:00 AM M M M M M Chilly temp., slight wind, no couds, damp. [edit: volunteer entered .15 and may have been a typo or meant to be a multi-day. Replaced with NA by CoCoStaff NN]
9/22/2015 7:00 AM 0.00 0.0 M M M Overcast skys,
9/23/2015 6:45 AM 0.00 0.0 M M M Cloudy, mild temperature, slight breeze. Scott Barto
9/24/2015 7:00 AM 0.00 0.0 M M M Temperature is cool. There are few clouds in the sky.
9/25/2015 7:00 AM 0.00 0.0 M M M Sunny. Slight cool breeze
9/28/2015 7:00 AM 0.00 0.0 M M M partly cloudy, cool, crisp fall air - Sadie Perry
9/29/2015 7:00 AM 0.06 M M M M Cool and cloudy.
9/30/2015 7:00 AM 0.05 M M M M Cool, cloudy



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
10/1/2014 10/02/2014 7:15 AM 2 0.10 M M Condensation on gauge
10/4/2014 10/06/2014 7:10 AM 3 0.00 M M Bug in gauge
10/11/2014 10/14/2014 7:15 AM 4 0.00 M M Droplets
10/25/2014 10/27/2014 7:10 AM 3 0.01 M M Leaf in gauge
10/31/2014 11/03/2014 7:00 AM 4 0.08 M M leaf in gauge. Zack B.
12/5/2014 12/09/2014 7:00 AM 5 0.00 M M
1/17/2015 1/19/2015 7:00 AM 3 0.00 M 0.00 Clear sky dry windy - cameron
1/24/2015 1/26/2015 7:00 AM 3 0.00 M M Clear skies, cool - Cam and Rocky
2/6/2015 2/08/2015 7:15 AM 3 0.01 M M
3/1/2015 3/02/2015 7:00 AM 2 0.12 5.5 M Overcast, precipitation frozen solid, observed by Rocky
3/14/2015 3/16/2015 7:00 AM 3 0.00 M M Semi clear skies
3/21/2015 3/23/2015 7:00 AM 3 0.00 M M Cold in morning, but most sunny, few clouds
3/28/2015 3/30/2015 7:00 AM 3 0.00 M M previous data incorrect, clear skies and slight breeze
4/6/2015 4/13/2015 7:00 AM 8 0.17 M M There was a dead fly in the rain gage
4/11/2015 4/13/2015 7:00 AM 3 0.00 M M Slightly chilly, clouds present
4/25/2015 4/27/2015 7:00 AM 3 0.62 M M started raining saturday, grey skies with a slight chill in air. reported by David Smith
5/1/2015 5/04/2015 7:00 AM 4 0.32 M M still raining cold drizzle. Mr. Hollins
5/6/2015 5/08/2015 9:00 AM 3 0.78 M M Consistent rain for two days. Mr. Hollins
8/28/2015 8/31/2015 7:00 AM 4 0.10 M M Cloudy, warm temp, slight rain. -Sam Biles
8/29/2015 8/31/2015 7:17 AM 3 0.05 M M Cold and cloudy
9/1/2015 9/03/2015 8:00 AM 3 T M M Warm, clouds -Sam Biles
9/5/2015 9/08/2015 8:00 AM 4 0.15 M M Warm sight wind -Sam Biles
9/12/2015 9/14/2015 8:00 AM 3 0.00 M M Sunny all weekend, very hot, no real cloud cover
9/19/2015 9/21/2015 7:00 AM 3 0.15 M M Chilly, slight wind, no clouds, damp
9/26/2015 9/28/2015 7:00 AM 3 0.00 M M Partly cloudy, cool



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