Station Overview Station Location
Station Number CO-JF-240 Latitude 39.817103
Station Name Arvada 3.8 W Longitude -105.177416
County Jefferson Elevation (ft) 5599



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 09 1.13 2.67 31 2.67 31 0.00 0 0 11 1 23.0 3 3
Nov 09 1.00 0.96 30 0.00 27 0.96 3 1 0 0 0.0 0 4
Dec 09 0.66 0.75 31 0.75 31 0.00 0 0 9 1 16.9 9 20
Jan 10 0.47 0.18 31 0.18 31 0.00 0 0 2 2 3.9 2 7
Feb 10 0.54 0.95 28 0.95 28 0.00 0 0 9 2 16.3 9 18
March 10 1.61 1.96 31 1.96 31 0.00 0 0 9 1 21.2 7 9
April 10 2.19 3.45 30 3.45 30 0.00 0 0 9 4 5.8 4 4
May 10 2.37 1.53 31 1.53 31 0.00 0 0 6 4 1.7 2 2
June 10 2.04 2.34 30 2.34 30 0.00 0 0 6 2 0.0 0 0
July 10 1.60 1.50 31 1.50 31 0.00 0 0 9 4 0.0 0 0
Aug 10 2.02 1.96 31 1.96 31 0.00 0 0 12 3 0.0 0 0
Sept 10 1.17 0.08 30 0.08 30 0.00 0 0 2 1 0.0 0 0
Water Year Totals: 16.80" 18.33" 365 days 17.37" 362 0.96" 3 days 1 84 days 25 days 88.8" 36 days 67 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
10/1/2009 0.00
10/2/2009 0.00
10/3/2009 0.00
10/4/2009 0.00
10/5/2009 T
10/6/2009 0.20
10/7/2009 0.00
10/8/2009 0.02
10/9/2009 0.06
10/10/2009 0.06
10/11/2009 0.00
10/12/2009 0.00
10/13/2009 0.00
10/14/2009 0.00
10/15/2009 0.00
10/16/2009 0.00
10/17/2009 0.00
10/18/2009 0.00
10/19/2009 0.00
10/20/2009 0.00
10/21/2009 0.25
10/22/2009 0.18
10/23/2009 0.00
10/24/2009 0.00
10/25/2009 0.03
10/26/2009 0.07
10/27/2009 0.00
10/28/2009 0.81
10/29/2009 0.65
10/30/2009 0.34
10/31/2009 0.00
11/1/2009 0.00
11/2/2009 0.00
11/3/2009 0.00
11/4/2009 0.00
11/5/2009 0.00
11/6/2009 0.00
11/7/2009 0.00
11/8/2009 0.00
11/9/2009 0.00
11/10/2009 0.00
11/11/2009 0.00
11/12/2009 0.00
11/13/2009 0.00
11/14/2009 **
11/15/2009 **
11/16/2009 0.96
11/17/2009 0.00
11/18/2009 0.00
11/19/2009 0.00
11/20/2009 0.00
11/21/2009 0.00
11/22/2009 0.00
11/23/2009 0.00
11/24/2009 0.00
11/25/2009 0.00
11/26/2009 0.00
11/27/2009 0.00
11/28/2009 0.00
11/29/2009 0.00
11/30/2009 0.00
12/1/2009 0.00
12/2/2009 0.06
12/3/2009 0.14
12/4/2009 0.00
12/5/2009 0.00
12/6/2009 0.10
12/7/2009 0.02
12/8/2009 0.03
12/9/2009 0.01
12/10/2009 0.00
12/11/2009 0.00
12/12/2009 0.00
12/13/2009 0.00
12/14/2009 0.00
12/15/2009 0.00
12/16/2009 0.00
12/17/2009 0.00
12/18/2009 0.00
12/19/2009 0.00
12/20/2009 0.00
12/21/2009 0.00
12/22/2009 0.00
12/23/2009 0.13
12/24/2009 0.24
12/25/2009 0.00
12/26/2009 T
12/27/2009 0.02
12/28/2009 0.00
12/29/2009 0.00
12/30/2009 0.00
12/31/2009 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2010 0.00
1/2/2010 0.00
1/3/2010 0.00
1/4/2010 T
1/5/2010 0.00
1/6/2010 0.00
1/7/2010 0.16
1/8/2010 0.00
1/9/2010 0.00
1/10/2010 0.00
1/11/2010 0.00
1/12/2010 0.00
1/13/2010 0.00
1/14/2010 0.00
1/15/2010 0.00
1/16/2010 0.00
1/17/2010 0.00
1/18/2010 0.00
1/19/2010 0.00
1/20/2010 0.00
1/21/2010 0.00
1/22/2010 0.00
1/23/2010 0.00
1/24/2010 0.00
1/25/2010 0.00
1/26/2010 0.00
1/27/2010 0.00
1/28/2010 0.02
1/29/2010 T
1/30/2010 0.00
1/31/2010 0.00
2/1/2010 0.00
2/2/2010 0.00
2/3/2010 0.00
2/4/2010 0.00
2/5/2010 T
2/6/2010 0.00
2/7/2010 T
2/8/2010 0.23
2/9/2010 0.06
2/10/2010 0.00
2/11/2010 0.00
2/12/2010 0.00
2/13/2010 0.00
2/14/2010 0.17
2/15/2010 0.01
2/16/2010 0.00
2/17/2010 0.00
2/18/2010 0.00
2/19/2010 0.14
2/20/2010 0.13
2/21/2010 0.04
2/22/2010 0.06
2/23/2010 0.00
2/24/2010 0.00
2/25/2010 0.00
2/26/2010 0.11
2/27/2010 0.00
2/28/2010 0.00
3/1/2010 0.05
3/2/2010 0.00
3/3/2010 0.00
3/4/2010 0.00
3/5/2010 0.00
3/6/2010 0.00
3/7/2010 0.00
3/8/2010 0.01
3/9/2010 0.00
3/10/2010 T
3/11/2010 0.01
3/12/2010 0.00
3/13/2010 0.00
3/14/2010 0.00
3/15/2010 0.24
3/16/2010 0.00
3/17/2010 0.00
3/18/2010 0.00
3/19/2010 0.23
3/20/2010 0.36
3/21/2010 0.00
3/22/2010 0.00
3/23/2010 0.00
3/24/2010 0.99
3/25/2010 0.03
3/26/2010 0.00
3/27/2010 0.04
3/28/2010 0.00
3/29/2010 0.00
3/30/2010 0.00
3/31/2010 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2010 0.00
4/2/2010 T
4/3/2010 0.00
4/4/2010 0.00
4/5/2010 0.00
4/6/2010 0.02
4/7/2010 0.13
4/8/2010 T
4/9/2010 0.00
4/10/2010 0.00
4/11/2010 0.00
4/12/2010 0.00
4/13/2010 0.00
4/14/2010 0.00
4/15/2010 0.00
4/16/2010 0.00
4/17/2010 0.00
4/18/2010 0.01
4/19/2010 0.00
4/20/2010 0.00
4/21/2010 T
4/22/2010 0.92
4/23/2010 0.63
4/24/2010 1.29
4/25/2010 T
4/26/2010 0.18
4/27/2010 0.00
4/28/2010 0.00
4/29/2010 0.24
4/30/2010 0.03
5/1/2010 0.00
5/2/2010 0.00
5/3/2010 0.00
5/4/2010 0.00
5/5/2010 0.00
5/6/2010 0.00
5/7/2010 0.06
5/8/2010 0.00
5/9/2010 0.00
5/10/2010 0.00
5/11/2010 0.00
5/12/2010 0.73
5/13/2010 0.06
5/14/2010 0.17
5/15/2010 0.31
5/16/2010 T
5/17/2010 0.00
5/18/2010 T
5/19/2010 T
5/20/2010 0.00
5/21/2010 0.00
5/22/2010 0.00
5/23/2010 0.00
5/24/2010 0.00
5/25/2010 0.00
5/26/2010 0.00
5/27/2010 T
5/28/2010 0.00
5/29/2010 0.00
5/30/2010 0.20
5/31/2010 0.00
6/1/2010 0.00
6/2/2010 0.00
6/3/2010 0.00
6/4/2010 0.00
6/5/2010 0.00
6/6/2010 T
6/7/2010 0.00
6/8/2010 0.00
6/9/2010 0.00
6/10/2010 0.00
6/11/2010 0.09
6/12/2010 1.46
6/13/2010 0.39
6/14/2010 0.26
6/15/2010 0.02
6/16/2010 0.00
6/17/2010 0.00
6/18/2010 0.00
6/19/2010 0.00
6/20/2010 0.00
6/21/2010 T
6/22/2010 0.00
6/23/2010 0.00
6/24/2010 0.00
6/25/2010 0.00
6/26/2010 0.00
6/27/2010 0.12
6/28/2010 0.00
6/29/2010 0.00
6/30/2010 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2010 0.00
7/2/2010 0.00
7/3/2010 T
7/4/2010 0.00
7/5/2010 0.38
7/6/2010 0.00
7/7/2010 0.31
7/8/2010 0.23
7/9/2010 0.09
7/10/2010 0.00
7/11/2010 T
7/12/2010 0.00
7/13/2010 0.00
7/14/2010 0.00
7/15/2010 0.31
7/16/2010 0.00
7/17/2010 0.00
7/18/2010 0.00
7/19/2010 0.00
7/20/2010 T
7/21/2010 0.11
7/22/2010 T
7/23/2010 0.04
7/24/2010 0.00
7/25/2010 0.00
7/26/2010 0.00
7/27/2010 0.00
7/28/2010 0.02
7/29/2010 0.00
7/30/2010 0.01
7/31/2010 0.00
8/1/2010 0.00
8/2/2010 0.03
8/3/2010 0.03
8/4/2010 0.01
8/5/2010 0.00
8/6/2010 0.10
8/7/2010 0.75
8/8/2010 0.04
8/9/2010 T
8/10/2010 0.33
8/11/2010 T
8/12/2010 0.00
8/13/2010 0.02
8/14/2010 0.00
8/15/2010 0.00
8/16/2010 0.00
8/17/2010 0.01
8/18/2010 0.00
8/19/2010 0.00
8/20/2010 0.51
8/21/2010 0.00
8/22/2010 0.00
8/23/2010 0.00
8/24/2010 0.12
8/25/2010 0.01
8/26/2010 0.00
8/27/2010 0.00
8/28/2010 0.00
8/29/2010 0.00
8/30/2010 0.00
8/31/2010 T
9/1/2010 0.00
9/2/2010 0.00
9/3/2010 0.00
9/4/2010 0.00
9/5/2010 0.00
9/6/2010 0.00
9/7/2010 0.00
9/8/2010 0.00
9/9/2010 0.02
9/10/2010 0.00
9/11/2010 0.00
9/12/2010 0.00
9/13/2010 0.00
9/14/2010 0.00
9/15/2010 0.00
9/16/2010 0.00
9/17/2010 0.00
9/18/2010 0.00
9/19/2010 0.00
9/20/2010 0.00
9/21/2010 0.00
9/22/2010 T
9/23/2010 0.06
9/24/2010 0.00
9/25/2010 0.00
9/26/2010 0.00
9/27/2010 0.00
9/28/2010 0.00
9/29/2010 0.00
9/30/2010 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2009 7:00 AM 0.00 0.0 M M M
10/2/2009 7:00 AM 0.00 0.0 M M M
10/3/2009 7:00 AM 0.00 0.0 M M M
10/4/2009 7:00 AM 0.00 0.0 M M M
10/5/2009 7:00 AM T M M M M A small amount of intermittent mist/drizzle occurred after sunset as cloud cover set in.
10/6/2009 7:00 AM 0.20 M M M M Light rain/drizzle begins around 2 PM and continues intermittently through 5 PM.
10/7/2009 7:00 AM 0.00 0.0 M M M
10/8/2009 7:00 AM 0.02 M M M M Drizzle begins in the early morning hours and was occurring at the time of this observation.
10/9/2009 7:00 AM 0.06 M M M M
10/10/2009 7:00 AM 0.06 M M M M
10/11/2009 7:00 AM 0.00 0.0 M M M
10/12/2009 7:00 AM 0.00 0.0 M M M
10/13/2009 7:00 AM 0.00 0.0 M M M
10/14/2009 7:00 AM 0.00 0.0 M M M Rare occurrence, for the Colorado Front Range, of moderate fog at the time of observation.
10/15/2009 7:00 AM 0.00 0.0 M M M
10/16/2009 7:00 AM 0.00 0.0 M M M
10/17/2009 7:00 AM 0.00 0.0 M M M
10/18/2009 7:00 AM 0.00 0.0 M M M
10/19/2009 7:00 AM 0.00 0.0 M M M
10/20/2009 7:00 AM 0.00 0.0 M M M
10/21/2009 7:00 AM 0.25 T 0.02 T 0.02 Drizzle, heavy at times, begins around 4 PM and continues through the night. Drizzle changes to snow sometime after midnight. Snowing at time of observation.
10/22/2009 7:00 AM 0.18 M M M M Snow at beginning of observation period changing to rain/snow mix during mid-morning. Precipitation becomes intermittent at 2 PM before ending at 6 PM. Snow cover amounted only to a trace on the ground and melted quickly. No snow remained at the time of the observation (7 AM).
10/23/2009 7:00 AM 0.00 0.0 M M M
10/24/2009 7:00 AM 0.00 0.0 M M M
10/25/2009 7:00 AM 0.03 M M M M
10/26/2009 7:00 AM 0.07 M M M M Intermittent Snow showers through out Sunday 10/25/09. At times, snow showers were heavy but only for a brief period (< 10 mins).
10/27/2009 7:00 AM 0.00 0.0 M M M
10/28/2009 7:00 AM 0.81 4.7 0.60 4.7 0.60 Precipitation began at rain at 6 PM and switched to snow at 7:45 PM. It was still snowing heavily at time of observation.
10/29/2009 7:00 AM 0.65 16.3 0.55 17.7 1.15 Precipitation began as rain at 6:00 PM on 10/27/09. It changed to snow at 7:45 PM on 10/27/09 and continues to snow up to today's observation time. Total snowfall received is 21.0 inches since storm began. 17.7 inches is snow cover after snow has settled.
10/30/2009 7:00 AM 0.34 2.0 0.25 14.5 M Total snow from Front Range storm that began at 6 PM on 10/27/09 and ended at 6:20 PM on 10/29/09 was 23.3 inches. Snow reported on ground is less due to settling and melting.
10/31/2009 7:00 AM 0.00 0.0 M M M
11/1/2009 7:00 AM 0.00 0.0 M M M
11/2/2009 7:00 AM 0.00 0.0 M M M
11/3/2009 7:00 AM 0.00 0.0 M M M
11/4/2009 7:00 AM 0.00 0.0 M M M
11/5/2009 7:00 AM 0.00 0.0 M M M
11/6/2009 7:00 AM 0.00 0.0 M M M
11/7/2009 7:00 AM 0.00 0.0 M M M
11/8/2009 7:00 AM 0.00 0.0 M M M
11/9/2009 7:00 AM 0.00 0.0 M M M
11/10/2009 7:00 AM 0.00 0.0 M M M
11/11/2009 7:00 AM 0.00 0.0 M M M
11/12/2009 7:00 AM 0.00 0.0 M M M
11/13/2009 7:00 AM 0.00 0.0 M M M
11/17/2009 7:00 AM 0.00 0.0 0.00 6.0 0.76
11/18/2009 7:00 AM 0.00 0.0 0.00 3.0 0.59
11/19/2009 7:00 AM 0.00 0.0 0.00 1.5 M
11/20/2009 7:00 AM 0.00 0.0 0.00 0.5 M Just an average of one half inch of snow cover left on the ground from the 11/15/09 snow event. Snow cover measurement taken from snow remaining in shaded areas.
11/21/2009 7:00 AM 0.00 0.0 M M M
11/22/2009 7:00 AM 0.00 0.0 M M M
11/23/2009 7:00 AM 0.00 0.0 M M M
11/24/2009 7:00 AM 0.00 0.0 M M M
11/25/2009 7:00 AM 0.00 0.0 M M M
11/26/2009 7:00 AM 0.00 0.0 M M M
11/27/2009 7:00 AM 0.00 0.0 M M M
11/28/2009 7:00 AM 0.00 0.0 M M M
11/29/2009 7:00 AM 0.00 0.0 M M M
11/30/2009 7:00 AM 0.00 0.0 M M M
12/1/2009 7:00 AM 0.00 0.0 M M M
12/2/2009 7:00 AM 0.06 1.8 0.06 2.0 0.06 Light snowfall during the time of observation.
12/3/2009 7:00 AM 0.14 3.4 0.16 4.5 M
12/4/2009 7:00 AM 0.00 0.0 0.00 3.5 0.27
12/5/2009 7:00 AM 0.00 0.0 0.00 2.5 0.14
12/6/2009 7:00 AM 0.10 2.5 0.10 4.5 M Snowing at the time of observation.
12/7/2009 7:00 AM 0.02 0.7 0.02 4.5 M
12/8/2009 7:00 AM 0.03 0.5 0.02 4.5 M
12/9/2009 7:00 AM 0.01 0.1 0.01 4.5 M Very light snow off and on during the day with some brief periods of sun. Very cold for Arvada area with the temperature stay at 5 above through out the day. Skies clear at nightfall and temperature pluments to 10 below.
12/10/2009 7:00 AM 0.00 0.0 0.00 4.0 M
12/11/2009 7:00 AM 0.00 0.0 M M M
12/12/2009 7:00 AM 0.00 0.0 0.00 3.0 M
12/13/2009 7:00 AM 0.00 0.0 0.00 2.0 M
12/14/2009 7:00 AM 0.00 0.0 0.00 1.0 M
12/15/2009 7:00 AM 0.00 0.0 0.00 0.5 M Total Snow measured in shaded area of station area.
12/16/2009 7:00 AM 0.00 0.0 0.00 0.5 M
12/17/2009 7:00 AM 0.00 0.0 0.00 T M
12/18/2009 7:00 AM 0.00 0.0 M M M
12/19/2009 7:00 AM 0.00 0.0 M M M
12/20/2009 7:00 AM 0.00 0.0 M M M
12/21/2009 7:00 AM 0.00 0.0 M M M
12/22/2009 7:00 AM 0.00 0.0 M M M
12/23/2009 7:00 AM 0.13 2.1 0.13 2.1 0.13 Snowing during observation.
12/24/2009 7:00 AM 0.24 5.6 0.24 7.5 M Clear skies and cold temperatures.
12/25/2009 7:00 AM 0.00 0.0 0.00 6.0 M Total snow amount affected by wind blowing snow in the area.
12/26/2009 7:00 AM T T T 4.0 M
12/27/2009 7:00 AM 0.02 0.2 0.02 4.0 M Snowing at beginning of observation period.
12/28/2009 7:00 AM 0.00 0.0 0.00 3.5 M
12/29/2009 7:00 AM 0.00 0.0 M M M
12/30/2009 7:00 AM 0.00 0.0 M M M
12/31/2009 7:00 AM 0.00 0.0 M M M
1/1/2010 7:00 AM 0.00 0.0 M M M
1/2/2010 7:00 AM 0.00 0.0 M M M
1/3/2010 7:00 AM 0.00 0.0 M M M
1/4/2010 7:00 AM T T T 2.0 M Brief snow flurries. Most of snow stayed in the foothills west of observation location.
1/5/2010 7:00 AM 0.00 0.0 M M M
1/6/2010 7:00 AM 0.00 0.0 0.00 T M Mild Temperatures at time of observation. 42 F at 7 AM. Frontal passage just minutes away from reaching this location.
1/7/2010 7:00 AM 0.16 3.7 0.16 3.7 0.16 Very dry snow. Frontal passage occurred between 7 and 7:30 AM. Temperature drop from 43 F to 27 F in 90 minutes. Temperature was in single digits by 4 PM.
1/8/2010 7:00 AM 0.00 0.0 0.00 2.5 M Sunny but very cold. -3 F at 7 AM.
1/9/2010 7:00 AM 0.00 0.0 0.00 2.0 M
1/10/2010 7:00 AM 0.00 0.0 0.00 1.5 M
1/11/2010 7:00 AM 0.00 0.0 0.00 1.0 M Total Snow depth measured in shadow areas.
1/12/2010 7:00 AM 0.00 0.0 0.00 T M
1/13/2010 7:00 AM 0.00 0.0 M M M
1/14/2010 7:00 AM 0.00 0.0 M M M
1/15/2010 7:00 AM 0.00 0.0 M M M
1/16/2010 7:00 AM 0.00 0.0 M M M
1/17/2010 7:00 AM 0.00 0.0 M M M
1/18/2010 7:00 AM 0.00 0.0 M M M
1/19/2010 7:00 AM 0.00 0.0 M M M
1/20/2010 7:00 AM 0.00 0.0 M M M
1/21/2010 7:00 AM 0.00 0.0 M M M
1/22/2010 7:00 AM 0.00 0.0 M M M
1/23/2010 7:00 AM 0.00 0.0 M M M
1/24/2010 7:00 AM 0.00 0.0 M M M
1/25/2010 7:00 AM 0.00 0.0 M M M
1/26/2010 7:00 AM 0.00 0.0 M M M
1/27/2010 7:00 AM 0.00 0.0 M M M
1/28/2010 7:00 AM 0.02 0.2 0.02 0.2 0.02 Intermittent flurries through out the night.
1/29/2010 7:00 AM T T T T M
1/30/2010 7:00 AM 0.00 0.0 M M M
1/31/2010 7:00 AM 0.00 0.0 M M M
2/1/2010 7:00 AM 0.00 0.0 M M M
2/2/2010 7:00 AM 0.00 0.0 M M M
2/3/2010 7:00 AM 0.00 0.0 M M M
2/4/2010 7:00 AM 0.00 0.0 M M M
2/5/2010 7:00 AM T T T T T Very brief snow flurries during 7 AM hour. Just a few snow flakes observed each minute.
2/6/2010 7:00 AM 0.00 0.0 M M M
2/7/2010 7:00 AM T T T T T Snowfall began just 15 minutes prior to the measurement being taken at 7 AM.
2/8/2010 7:00 AM 0.23 2.2 0.19 2.2 0.19 Snowing for 24 hours and snowing at time of observation. Snowfall was light during the 24 hours and there was melting of the snow during the day. It resulted in only about one inch on the ground at sunset. However the snow began to accumulate after sunset until the measurement was taken at 7 AM.
2/9/2010 7:00 AM 0.06 3.0 0.06 4.5 0.11 Persistent light snowshowers through out the day.
2/10/2010 7:00 AM 0.00 0.0 0.00 3.0 M
2/11/2010 7:00 AM 0.00 0.0 0.00 2.5 M
2/12/2010 7:00 AM 0.00 0.0 0.00 2.0 M
2/13/2010 7:00 AM 0.00 0.0 0.00 1.0 M
2/14/2010 7:00 AM 0.17 3.6 0.17 4.0 M Very light snowfall at time of observation.
2/15/2010 7:00 AM 0.01 0.1 0.01 2.0 M Very lightly snowing at the beginning of the observation period.
2/16/2010 7:00 AM 0.00 0.0 0.00 1.5 M
2/17/2010 7:00 AM 0.00 0.0 0.00 1.0 M
2/18/2010 7:00 AM 0.00 0.0 0.00 0.5 M Average total snow depth measured in shaded areas. Bare spots in observation area.
2/19/2010 7:00 AM 0.14 1.4 0.12 1.5 0.12 A few snowflakes falling at time of observation.
2/20/2010 7:00 AM 0.13 1.8 0.13 3.0 M Snowfall was light until 3:45 PM then increased in intensity until 5 PM. After 5 PM, snowfall diminished to light flurries and continued at this lower rate through the night. It snowed off and on during the entire day.
2/21/2010 7:00 AM 0.04 1.0 0.04 3.0 M Very light snowfall off and on during the entire observation period.
2/22/2010 7:00 AM 0.06 1.7 0.07 4.0 M Snow flurries through out the day. A brief snow squall came through the area at 3:45 PM and brought moderate snowfall to the observation location for 15 minutes. Light snow flurries returned at 4 PM and continued until the early morning hours.
2/23/2010 7:00 AM 0.00 0.0 0.00 3.0 M
2/24/2010 7:00 AM 0.00 0.0 0.00 2.5 M
2/25/2010 7:00 AM 0.00 0.0 M M M
2/26/2010 7:00 AM 0.11 1.5 0.10 2.5 M Snowed over night
2/27/2010 7:00 AM 0.00 0.0 0.00 T M
2/28/2010 7:00 AM 0.00 0.0 0.00 T M
3/1/2010 7:00 AM 0.05 0.9 0.05 1.0 0.05 Much of the snow melted as it hit the ground. Accumulated only in grassy areas. Melting very quickly at time of observation. Skies are clear.
3/2/2010 7:00 AM 0.00 0.0 0.00 T M
3/3/2010 7:00 AM 0.00 0.0 0.00 T M
3/4/2010 7:00 AM 0.00 0.0 M M M
3/5/2010 7:00 AM 0.00 0.0 M M M
3/6/2010 7:00 AM 0.00 0.0 M M M
3/7/2010 7:00 AM 0.00 0.0 M M M
3/8/2010 7:00 AM 0.01 0.0 0.00 0.0 0.00 Precipitation fell as rain during the overnight hours.
3/9/2010 7:00 AM 0.00 0.0 M M M
3/10/2010 7:00 AM T 0.0 0.00 0.0 0.00 A few drops or rain observed around 2 PM.
3/11/2010 7:00 AM 0.01 0.1 0.01 T M
3/12/2010 7:00 AM 0.00 0.0 M M M
3/13/2010 7:00 AM 0.00 0.0 M M M
3/14/2010 7:00 AM 0.00 0.0 M M M
3/15/2010 7:00 AM 0.24 0.3 0.01 0.5 0.01 Snow and rain mixed through the day Sunday, March 14 as observation station was located right at the demarkcation line between rain and snow. Snow melted as it reached the ground with only a small amount remaining on the ground after dark.
3/16/2010 7:00 AM 0.00 0.0 M M M
3/17/2010 7:00 AM 0.00 0.0 M M M
3/18/2010 7:00 AM 0.00 0.0 M M M
3/19/2010 7:00 AM 0.23 2.8 0.15 3.0 0.15 Snow began at 4:45 AM and was snowing at the time of obsevation. All precpitation fell as snow.
3/20/2010 7:00 AM 0.36 6.1 0.47 9.0 M Snowing at the beginning of observation period. Heaviest snow fall between 2 and 3 PM. Melted core more than observed melted snow equivalent but measurement was taken correctly.
3/21/2010 7:00 AM 0.00 0.0 0.00 5.0 M
3/22/2010 7:00 AM 0.00 0.0 0.00 0.5 0.04
3/23/2010 7:00 AM 0.00 0.0 0.00 T M
3/24/2010 7:00 AM 0.99 10.7 1.18 11.0 1.18 Precipitation began as rain at 2:15 PM and changed over to snow at 4:45 PM. It was still snowing at time of observation. Thunder was observed during the time it rained.
3/25/2010 7:00 AM 0.03 0.3 0.03 5.0 M Lightly snowing at the beginning of the observation period.
3/26/2010 7:00 AM 0.00 0.0 0.00 2.5 M
3/27/2010 7:00 AM 0.04 0.0 0.00 0.0 M A mixture of rain and snow during the late afternoon. It was of brief duration beginning as rain and then changing to moderate snow flurries before ending. Snow melted as it hit the ground.
3/28/2010 7:00 AM 0.00 0.0 M M M
3/29/2010 7:00 AM 0.00 0.0 M M M
3/30/2010 7:00 AM 0.00 0.0 M M M
3/31/2010 7:00 AM 0.00 0.0 M M M
4/1/2010 7:00 AM 0.00 0.0 M M M
4/2/2010 7:00 AM T M M M M Just a few drops of rain with frontal passage.
4/3/2010 7:00 AM 0.00 0.0 M M M
4/4/2010 7:00 AM 0.00 0.0 M M M
4/5/2010 7:00 AM 0.00 0.0 M M M
4/6/2010 7:00 AM 0.02 0.0 0.00 0.0 0.00 Light rain fell during the very early morning hours. Duration information derived from radar time lapse images.
4/7/2010 7:00 AM 0.13 2.7 0.16 2.5 0.16 Mild Thundershower from 7:00 to 07:30 AM. 0.02 inches fell durinh tundershower and then snow begins over night and is snowing at time of observation.
4/8/2010 7:00 AM T T T T M Snowing at the beginning of observation period but it quickly ended leaving only a trace of additional precipitation from snowstorm that started the previous day.
4/9/2010 7:00 AM 0.00 0.0 M M M
4/10/2010 7:00 AM 0.00 0.0 M M M
4/11/2010 7:00 AM 0.00 0.0 M M M
4/12/2010 7:00 AM 0.00 0.0 M M M
4/13/2010 7:00 AM 0.00 0.0 M M M
4/14/2010 7:00 AM 0.00 0.0 M M M
4/15/2010 7:00 AM 0.00 0.0 M M M
4/16/2010 7:00 AM 0.00 0.0 M M M
4/17/2010 7:00 AM 0.00 0.0 M M M
4/18/2010 7:00 AM 0.01 0.0 0.00 0.0 0.00 Drizzle to very light rain fell intermitently between 10 AM and 7 PM. Rain occurred very briefly during the time period and then stopped only to occur again later in the day.
4/19/2010 7:00 AM 0.00 0.0 M M M
4/20/2010 7:00 AM 0.00 0.0 M M M
4/21/2010 7:00 AM T 0.0 0.00 0.0 0.00 A few drops of rain occurred intermittently mainly during the morning hours
4/22/2010 7:00 AM 0.92 0.0 0.00 0.0 0.00 Moderate Thundershower began at 07:50 PM. Graupel fell between 08:00 PM and 08:05 PM. Moderate rain showers occurred through out the night.
4/23/2010 7:00 AM 0.63 0.0 0.00 0.0 0.00 Moderate rains intermittently through out the day and night
4/24/2010 7:00 AM 1.29 2.1 0.18 2.0 0.18 Mixture od snow and rain through out the day. Snow falls from 11 AM until 1 PM then changes back to rain. At the same time, temperature falls from 39 F to 34 F before returning to 39 F after 1 PM. Snow cover melts after precipitation changes back to rain.
4/25/2010 7:00 AM T M M M M Trace of rain fell as a residual to storm that left 3 inches of rain over last three days.
4/26/2010 7:00 AM 0.18 0.6 0.02 0.6 0.02 Light rain begins at 6:45 PM and changes to snow over night.
4/27/2010 7:00 AM 0.00 0.0 M M M
4/28/2010 7:00 AM 0.00 0.0 M M M
4/29/2010 7:00 AM 0.24 0.4 0.02 0.4 0.02 Rain changed to snow at 6:15 AM. Snow at time of observation. Rain began at 10:30 PM but was not continuous.
4/30/2010 7:00 AM 0.03 T T 0.0 0.00
5/1/2010 7:00 AM 0.00 0.0 M M M
5/2/2010 7:00 AM 0.00 0.0 M M M
5/3/2010 7:00 AM 0.00 0.0 M M M
5/4/2010 7:00 AM 0.00 0.0 M M M
5/5/2010 7:00 AM 0.00 0.0 M M M No precipitation but sustained winds of 20 mph or more occurred during the afternoon and early evening.
5/6/2010 7:00 AM 0.00 0.0 M M M
5/7/2010 7:00 AM 0.06 0.3 0.01 0.5 0.01 Light rain during the early evening then very light snow over night.
5/8/2010 7:00 AM 0.00 0.0 M M M
5/9/2010 7:00 AM 0.00 0.0 M M M
5/10/2010 7:00 AM 0.00 0.0 M M M
5/11/2010 7:00 AM 0.00 0.0 M M M
5/12/2010 7:00 AM 0.73 1.4 0.31 1.5 0.31 Off and on drizzle begins about 3 PM in the afternoon and then a cold steady rain begins at 4:40 PM. The rain switches to snow at 11 PM before ending at sometime during the night.
5/13/2010 7:00 AM 0.06 T 0.01 T 0.01 Light rain mixed wth snow with a trace of accumlation on ground. Snow melts within one hour of accumulation. Time of preciptation not recorded.
5/14/2010 7:00 AM 0.17 M M M M Scattered rain showers in area begin at 4:30 PM but becomes steady at 10:15 PM and continue though part of the night. Ends at 1:30 AM but this time is an estimate.
5/15/2010 7:00 AM 0.31 M M M M Light rain during late afternoon then a break in the rain before rain showers occurring over night.
5/16/2010 7:00 AM T M M M M
5/17/2010 7:00 AM 0.00 0.0 M M M
5/18/2010 7:00 AM T M M M M Scattered cumulus congestus clouds produced localized downpours of rain in the area. At observation location, only a few big drops of rain as clouds drifted slowly to the east.
5/19/2010 7:00 AM T M M M M Thundershowers developed over the observation area and moved to the northeast. Only a brief period of rain left a trace.
5/20/2010 7:00 AM 0.00 0.0 M M M
5/21/2010 7:00 AM 0.00 0.0 M M M
5/22/2010 7:00 AM 0.00 0.0 M M M
5/23/2010 7:00 AM 0.00 0.0 M M M
5/24/2010 7:00 AM 0.00 0.0 M M M
5/25/2010 7:00 AM 0.00 0.0 M M M
5/26/2010 7:00 AM 0.00 0.0 M M M
5/27/2010 7:00 AM T M M M M Very brief, light rain as thundershowers passed to the north of observation location.
5/28/2010 7:00 AM 0.00 0.0 M M M
5/29/2010 7:00 AM 0.00 0.0 M M M
5/30/2010 7:00 AM 0.20 M M M M Afternoon thundershower over observation location. Time of occurrence unknown.
5/31/2010 7:00 AM 0.00 0.0 M M M
6/1/2010 7:00 AM 0.00 0.0 M M M
6/2/2010 7:00 AM 0.00 0.0 M M M
6/3/2010 7:00 AM 0.00 0.0 M M M
6/4/2010 7:00 AM 0.00 0.0 M M M
6/5/2010 7:00 AM 0.00 0.0 M M M
6/6/2010 7:00 AM T M M M M Brief very light rain from convective activity in the area. No thunder or lightning observed.
6/7/2010 7:00 AM 0.00 0.0 M M M
6/8/2010 7:00 AM 0.00 0.0 M M M
6/9/2010 7:00 AM 0.00 0.0 M M M
6/10/2010 7:00 AM 0.00 0.0 M M M
6/11/2010 7:00 AM 0.09 M M M M
6/12/2010 7:00 AM 1.46 M M M M Rain through out the day due to upslope conditions. Rain is heavy at times.
6/13/2010 7:00 AM 0.39 M M M M Rain off and on through the day.
6/14/2010 7:00 AM 0.26 M M M M Light rain in the morning then a break in the weather before rain begins again at 7:45 PM
6/15/2010 7:00 AM 0.02 0.0 M M M A brief shower in the afternoon.
6/16/2010 7:00 AM 0.00 0.0 M M M
6/17/2010 7:00 AM 0.00 0.0 M M M
6/18/2010 7:00 AM 0.00 0.0 M M M
6/19/2010 7:00 AM 0.00 0.0 M M M
6/20/2010 7:00 AM 0.00 0.0 M M M
6/21/2010 7:00 AM T M M M M A few drops of rain from passing cumulus congestus clouds.
6/22/2010 7:00 AM 0.00 0.0 M M M
6/23/2010 7:00 AM 0.00 0.0 M M M
6/24/2010 7:00 AM 0.00 0.0 M M M
6/25/2010 7:00 AM 0.00 0.0 M M M
6/26/2010 7:00 AM 0.00 0.0 M M M
6/27/2010 7:00 AM 0.12 M M M M Light afternoon thundershowers pass through the area.
6/28/2010 7:00 AM 0.00 0.0 M M M
6/29/2010 7:00 AM 0.00 0.0 M M M
6/30/2010 7:00 AM 0.00 0.0 M M M
7/1/2010 7:00 AM 0.00 0.0 M M M
7/2/2010 7:00 AM 0.00 0.0 M M M
7/3/2010 7:00 AM T M M M M
7/4/2010 7:00 AM 0.00 0.0 M M M
7/5/2010 7:00 AM 0.38 M M M M
7/6/2010 7:00 AM 0.00 0.0 M M M
7/7/2010 7:00 AM 0.31 M M M M
7/8/2010 7:00 AM 0.23 M M M M
7/9/2010 7:00 AM 0.09 M M M M
7/10/2010 7:00 AM 0.00 0.0 M M M
7/11/2010 7:00 AM T M M M M
7/12/2010 7:00 AM 0.00 0.0 M M M
7/13/2010 7:00 AM 0.00 0.0 M M M
7/14/2010 7:00 AM 0.00 0.0 M M M
7/15/2010 7:00 AM 0.31 M M M M High base Thundershower provided for a surprizing amount of precipitation
7/16/2010 7:00 AM 0.00 0.0 M M M
7/17/2010 7:00 AM 0.00 0.0 M M M
7/18/2010 7:00 AM 0.00 0.0 M M M
7/19/2010 7:00 AM 0.00 0.0 M M M
7/20/2010 7:00 AM T M M M M Thundershower moved from west to east and just south of observation area. This resulted in only a few drops of rain at observation location.
7/21/2010 7:00 AM 0.11 M M M M Afternoon thundershower.
7/22/2010 7:00 AM T M M M M
7/23/2010 7:00 AM 0.04 M M M M Brief afternoon thundershower.
7/24/2010 7:00 AM 0.00 0.0 M M M
7/25/2010 7:00 AM 0.00 0.0 M M M
7/26/2010 7:00 AM 0.00 0.0 M M M
7/27/2010 7:00 AM 0.00 0.0 M M M
7/28/2010 7:00 AM 0.02 M M M M Brief Thundershower passing through the area during the afternoon.
7/29/2010 7:00 AM 0.00 0.0 M M M
7/30/2010 7:00 AM 0.01 M M M M Few droplets of rain from outflow of thindershower.
7/31/2010 7:00 AM 0.00 0.0 M M M
8/1/2010 7:00 AM 0.00 0.0 M M M
8/2/2010 7:00 AM 0.03 M M M M A brief period of rain from thundershowers coming down from the foothills.
8/3/2010 7:00 AM 0.03 M M M M Weak thundershower near sunset gave a small amount of rain. Brief rain ocurred after the thundershower off and on until about 10 PM.
8/4/2010 7:00 AM 0.01 M M M M Very light rain briefly occurred after sunset.
8/5/2010 7:00 AM 0.00 0.0 M M M
8/6/2010 7:00 AM 0.10 M M M M Light rain from mild thundershower.
8/7/2010 7:00 AM 0.75 M M M M Cloudburst from thundershower cell drifting from west to east.
8/8/2010 7:00 AM 0.04 M M M M Brief very light rain at sunset.
8/9/2010 7:00 AM T M M M M Drizzle occuring at the end of the observation period.
8/10/2010 7:00 AM 0.33 M M M M Thundershowers from monsoon moisture during late afternoon.
8/11/2010 7:00 AM T M M M M Very brief shower passed over the observation area. No thunder or lightning observed.
8/12/2010 7:00 AM 0.00 0.0 M M M
8/13/2010 7:00 AM 0.02 M M M M Brief rain towards late afternoon.
8/14/2010 7:00 AM 0.00 0.0 M M M
8/15/2010 7:00 AM 0.00 0.0 M M M
8/16/2010 7:00 AM 0.00 0.0 M M M
8/17/2010 7:00 AM 0.01 M M M M Weak thundershower around 5 PM providing very little rain.
8/18/2010 7:00 AM 0.00 0.0 M M M
8/19/2010 7:00 AM 0.00 0.0 M M M
8/20/2010 7:00 AM 0.51 M M M M Two thundershowers passed over the observation location. The first shower dropped rain from 3:47 until 4:23 PM and precipitation amounted to 0.19 inches. A second stronger shower began at 08:03 PM and ended at 08:27 PM. It dropped 0.32 inches. The second shower showed signs of developing a wall cloud but because of the shower's development late in the day the wall cloud never fully matured.
8/21/2010 7:00 AM 0.00 0.0 M M M
8/22/2010 7:00 AM 0.00 0.0 M M M
8/23/2010 7:00 AM 0.00 0.0 M M M
8/24/2010 7:00 AM 0.12 M M M M Rain occurred during two separate events over the last 24 hours. A brief thundershower occurred during the 3 PM hour dropping 0.02 inches of rain. Upslope conditions developed over night and it began raining at 3:45 AM and continues through the end of the observation time.
8/25/2010 7:00 AM 0.01 M M M M Brief afternoon precipitation event from a passing shower.
8/26/2010 7:00 AM 0.00 0.0 M M M
8/27/2010 7:00 AM 0.00 0.0 M M M
8/28/2010 7:00 AM 0.00 0.0 M M M
8/29/2010 7:00 AM 0.00 0.0 M M M
8/30/2010 7:00 AM 0.00 0.0 M M M
8/31/2010 7:00 AM T M M M M A trace of rain during the noon hour from a cumulus congestus cloud passing overhead.
9/1/2010 7:00 AM 0.00 0.0 M M M No rain at observation site but I did observed development of a cumulonimbus cloud just to the east and south of site. This turned into a mild thunderstorm cell which traveled to the north and east. Rain fell at a moderate rate for about 5 minutes at 57th and Wadsworth Avenue. Estimate that at least 0.07 inches fell during this 5 minute period.
9/2/2010 7:00 AM 0.00 0.0 M M M
9/3/2010 7:00 AM 0.00 0.0 M M M
9/4/2010 7:00 AM 0.00 0.0 M M M
9/5/2010 7:00 AM 0.00 0.0 M M M
9/6/2010 7:00 AM 0.00 0.0 M M M
9/7/2010 7:00 AM 0.00 0.0 M M M
9/8/2010 7:00 AM 0.00 0.0 M M M
9/9/2010 7:00 AM 0.02 M M M M Light rain occurred briefly from high based shower clouds. No thunder observed.
9/10/2010 7:00 AM 0.00 0.0 M M M
9/11/2010 7:00 AM 0.00 0.0 M M M
9/12/2010 7:00 AM 0.00 0.0 M M M
9/13/2010 7:00 AM 0.00 0.0 M M M
9/14/2010 7:00 AM 0.00 0.0 M M M
9/15/2010 7:00 AM 0.00 0.0 M M M
9/16/2010 7:00 AM 0.00 0.0 M M M
9/17/2010 7:00 AM 0.00 0.0 M M M
9/18/2010 7:00 AM 0.00 0.0 M M M
9/19/2010 7:00 AM 0.00 0.0 M M M
9/20/2010 7:00 AM 0.00 0.0 M M M
9/21/2010 7:00 AM 0.00 0.0 M M M No rain collected at site however thundestorm cell passed 5 miles to the south of observation location. Frequent lightning, a micro burst and brief heavy rain occurred at the Wheatridge/Arvada city limit (44th and Youngfield). Precipitation began at 6:25 PM and continued until 6:45 PM.
9/22/2010 7:00 AM T M M M M Mild thundershowers beginning at 5PM and lasting until 9 PM. However rain from these individuals thundershower cells was spotty. One cell would drift over the area and produce a few drops of rain. The next cell would drift over the area and produce a few drops. This pattern of rainfall would continue until 9 PM. The cells never produced significant rain at observation location. However, a good thunder shower occurred in downtown Denver at 5 PM and another in Broomfield around 8:30 PM.
9/23/2010 7:00 AM 0.06 M M M M Drizzle during the 5/6 PM hour resulted in 0.05 of inch. Another 0.01 fell during the early morning hours ending at 06:15 AM.
9/24/2010 7:00 AM 0.00 0.0 M M M
9/25/2010 7:00 AM 0.00 0.0 M M M
9/26/2010 7:00 AM 0.00 0.0 M M M
9/27/2010 7:00 AM 0.00 0.0 M M M
9/28/2010 7:00 AM 0.00 0.0 M M M
9/29/2010 7:00 AM 0.00 0.0 M M M
9/30/2010 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
11/14/2009 11/16/2009 7:00 AM 3 0.96 8.6 0.75 Snow depth was first measured at 12:30 PM on 11/15/09 when precipitation event was about to end. The depth was 9.1 inches. At 7 AM on 11/16/09, snow had settled to 8.6 inches.



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
4/21/2010 8:00 PM Pad was not exposed to this hail event. The 5 minute hail event was comprized of all graupel Rice Rice Rice Soft|White Ice 5 1min no damage Continuous True After rain Same time as smaller hail 10-20 0