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 11 1.13 1.37 31 1.37 31 0.00 0 0 5 1 6.5 2 4
Nov 11 1.00 0.56 30 0.56 30 0.00 0 0 2 1 7.0 1 3
Dec 11 0.66 1.31 31 1.31 31 0.00 0 0 8 1 25.2 8 26
Jan 12 0.47 0.25 31 0.25 31 0.00 0 0 5 1 4.9 5 5
Feb 12 0.54 1.40 29 1.40 29 0.00 0 0 7 2 25.2 8 22
March 12 1.61 0.00 31 0.00 31 0.00 0 0 0 6 0.0 0 0
April 12 2.19 1.19 30 1.19 30 0.00 0 0 6 0 2.2 3 3
May 12 2.37 1.90 31 1.90 31 0.00 0 0 7 2 0.0 0 0
June 12 2.04 0.17 30 0.17 30 0.00 0 0 5 4 0.0 0 0
July 12 1.60 2.43 31 2.43 31 0.00 0 0 12 4 0.0 0 0
Aug 12 2.02 0.56 31 0.56 31 0.00 0 0 4 3 0.0 0 0
Sept 12 1.17 1.72 30 1.72 30 0.00 0 0 5 2 0.0 0 0
Water Year Totals: 16.80" 12.86" 366 days 12.86" 366 0.00" 0 days 0 66 days 27 days 71.0" 27 days 63 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
10/1/2011 0.00
10/2/2011 0.00
10/3/2011 0.00
10/4/2011 0.00
10/5/2011 T
10/6/2011 0.00
10/7/2011 0.00
10/8/2011 0.16
10/9/2011 0.22
10/10/2011 0.00
10/11/2011 0.00
10/12/2011 0.00
10/13/2011 0.00
10/14/2011 0.00
10/15/2011 0.00
10/16/2011 0.00
10/17/2011 0.00
10/18/2011 0.03
10/19/2011 0.00
10/20/2011 0.00
10/21/2011 0.00
10/22/2011 0.00
10/23/2011 0.00
10/24/2011 0.00
10/25/2011 0.00
10/26/2011 0.75
10/27/2011 0.21
10/28/2011 0.00
10/29/2011 0.00
10/30/2011 0.00
10/31/2011 0.00
11/1/2011 0.00
11/2/2011 0.54
11/3/2011 0.02
11/4/2011 0.00
11/5/2011 0.00
11/6/2011 T
11/7/2011 0.00
11/8/2011 0.00
11/9/2011 0.00
11/10/2011 0.00
11/11/2011 0.00
11/12/2011 0.00
11/13/2011 0.00
11/14/2011 0.00
11/15/2011 0.00
11/16/2011 0.00
11/17/2011 0.00
11/18/2011 0.00
11/19/2011 0.00
11/20/2011 0.00
11/21/2011 0.00
11/22/2011 0.00
11/23/2011 0.00
11/24/2011 0.00
11/25/2011 0.00
11/26/2011 0.00
11/27/2011 0.00
11/28/2011 0.00
11/29/2011 0.00
11/30/2011 0.00
12/1/2011 0.27
12/2/2011 0.05
12/3/2011 0.14
12/4/2011 0.05
12/5/2011 0.08
12/6/2011 T
12/7/2011 0.00
12/8/2011 0.00
12/9/2011 0.00
12/10/2011 0.00
12/11/2011 0.00
12/12/2011 0.00
12/13/2011 0.00
12/14/2011 0.00
12/15/2011 0.00
12/16/2011 0.00
12/17/2011 0.00
12/18/2011 0.00
12/19/2011 0.00
12/20/2011 0.05
12/21/2011 0.00
12/22/2011 0.62
12/23/2011 0.05
12/24/2011 0.00
12/25/2011 0.00
12/26/2011 0.00
12/27/2011 0.00
12/28/2011 0.00
12/29/2011 0.00
12/30/2011 0.00
12/31/2011 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2012 0.00
1/2/2012 0.00
1/3/2012 0.00
1/4/2012 0.00
1/5/2012 0.00
1/6/2012 0.00
1/7/2012 0.00
1/8/2012 0.13
1/9/2012 0.00
1/10/2012 0.00
1/11/2012 0.02
1/12/2012 0.08
1/13/2012 0.00
1/14/2012 0.00
1/15/2012 0.00
1/16/2012 0.00
1/17/2012 0.01
1/18/2012 0.00
1/19/2012 0.00
1/20/2012 0.00
1/21/2012 0.00
1/22/2012 0.00
1/23/2012 0.00
1/24/2012 0.00
1/25/2012 T
1/26/2012 0.00
1/27/2012 0.00
1/28/2012 0.01
1/29/2012 0.00
1/30/2012 0.00
1/31/2012 0.00
2/1/2012 0.00
2/2/2012 0.00
2/3/2012 0.63
2/4/2012 0.27
2/5/2012 T
2/6/2012 0.00
2/7/2012 0.08
2/8/2012 0.01
2/9/2012 0.00
2/10/2012 0.00
2/11/2012 0.05
2/12/2012 T
2/13/2012 0.00
2/14/2012 0.00
2/15/2012 0.00
2/16/2012 0.00
2/17/2012 0.00
2/18/2012 0.00
2/19/2012 0.00
2/20/2012 0.00
2/21/2012 0.00
2/22/2012 0.00
2/23/2012 0.35
2/24/2012 0.01
2/25/2012 0.00
2/26/2012 0.00
2/27/2012 0.00
2/28/2012 0.00
2/29/2012 0.00
3/1/2012 0.00
3/2/2012 T
3/3/2012 T
3/4/2012 0.00
3/5/2012 0.00
3/6/2012 0.00
3/7/2012 T
3/8/2012 T
3/9/2012 0.00
3/10/2012 0.00
3/11/2012 0.00
3/12/2012 T
3/13/2012 0.00
3/14/2012 0.00
3/15/2012 0.00
3/16/2012 0.00
3/17/2012 0.00
3/18/2012 0.00
3/19/2012 T
3/20/2012 0.00
3/21/2012 0.00
3/22/2012 0.00
3/23/2012 0.00
3/24/2012 0.00
3/25/2012 0.00
3/26/2012 0.00
3/27/2012 0.00
3/28/2012 0.00
3/29/2012 0.00
3/30/2012 0.00
3/31/2012 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2012 0.00
4/2/2012 0.00
4/3/2012 0.14
4/4/2012 0.28
4/5/2012 0.00
4/6/2012 0.00
4/7/2012 0.00
4/8/2012 0.00
4/9/2012 0.00
4/10/2012 0.00
4/11/2012 0.00
4/12/2012 0.13
4/13/2012 0.00
4/14/2012 0.00
4/15/2012 0.52
4/16/2012 0.09
4/17/2012 0.00
4/18/2012 0.00
4/19/2012 0.00
4/20/2012 0.00
4/21/2012 0.00
4/22/2012 0.00
4/23/2012 0.00
4/24/2012 0.00
4/25/2012 0.00
4/26/2012 0.00
4/27/2012 0.03
4/28/2012 0.00
4/29/2012 0.00
4/30/2012 0.00
5/1/2012 0.00
5/2/2012 0.00
5/3/2012 0.00
5/4/2012 0.00
5/5/2012 0.00
5/6/2012 0.01
5/7/2012 0.38
5/8/2012 0.32
5/9/2012 0.00
5/10/2012 0.00
5/11/2012 0.00
5/12/2012 0.21
5/13/2012 0.15
5/14/2012 0.00
5/15/2012 0.00
5/16/2012 0.00
5/17/2012 0.00
5/18/2012 0.00
5/19/2012 T
5/20/2012 0.34
5/21/2012 T
5/22/2012 0.00
5/23/2012 0.00
5/24/2012 0.49
5/25/2012 0.00
5/26/2012 0.00
5/27/2012 0.00
5/28/2012 0.00
5/29/2012 0.00
5/30/2012 0.00
5/31/2012 0.00
6/1/2012 0.00
6/2/2012 T
6/3/2012 0.02
6/4/2012 0.00
6/5/2012 0.00
6/6/2012 0.00
6/7/2012 0.05
6/8/2012 0.00
6/9/2012 0.00
6/10/2012 0.00
6/11/2012 0.00
6/12/2012 0.00
6/13/2012 0.00
6/14/2012 0.00
6/15/2012 0.00
6/16/2012 T
6/17/2012 T
6/18/2012 0.00
6/19/2012 0.00
6/20/2012 0.00
6/21/2012 0.00
6/22/2012 0.00
6/23/2012 0.00
6/24/2012 0.00
6/25/2012 T
6/26/2012 0.00
6/27/2012 0.06
6/28/2012 0.03
6/29/2012 0.00
6/30/2012 0.01
Day of YearDaily PrcpMultiday Prcp
7/1/2012 0.00
7/2/2012 0.00
7/3/2012 0.01
7/4/2012 T
7/5/2012 0.00
7/6/2012 0.00
7/7/2012 0.75
7/8/2012 0.13
7/9/2012 0.49
7/10/2012 0.06
7/11/2012 0.00
7/12/2012 0.00
7/13/2012 0.00
7/14/2012 0.00
7/15/2012 0.00
7/16/2012 T
7/17/2012 0.20
7/18/2012 0.02
7/19/2012 0.00
7/20/2012 0.00
7/21/2012 0.00
7/22/2012 0.00
7/23/2012 0.00
7/24/2012 0.01
7/25/2012 0.02
7/26/2012 0.00
7/27/2012 T
7/28/2012 0.56
7/29/2012 T
7/30/2012 0.12
7/31/2012 0.06
8/1/2012 0.36
8/2/2012 0.03
8/3/2012 0.00
8/4/2012 0.00
8/5/2012 0.00
8/6/2012 0.00
8/7/2012 0.00
8/8/2012 0.00
8/9/2012 0.00
8/10/2012 0.00
8/11/2012 T
8/12/2012 0.16
8/13/2012 0.00
8/14/2012 0.00
8/15/2012 0.00
8/16/2012 0.00
8/17/2012 0.00
8/18/2012 0.00
8/19/2012 0.00
8/20/2012 0.00
8/21/2012 0.00
8/22/2012 0.00
8/23/2012 0.01
8/24/2012 0.00
8/25/2012 0.00
8/26/2012 0.00
8/27/2012 0.00
8/28/2012 T
8/29/2012 0.00
8/30/2012 T
8/31/2012 0.00
9/1/2012 0.00
9/2/2012 T
9/3/2012 0.00
9/4/2012 0.00
9/5/2012 0.00
9/6/2012 0.00
9/7/2012 0.00
9/8/2012 0.00
9/9/2012 0.00
9/10/2012 0.00
9/11/2012 0.00
9/12/2012 0.71
9/13/2012 0.45
9/14/2012 0.00
9/15/2012 0.00
9/16/2012 0.00
9/17/2012 0.00
9/18/2012 0.00
9/19/2012 0.00
9/20/2012 0.00
9/21/2012 0.00
9/22/2012 0.00
9/23/2012 0.00
9/24/2012 0.00
9/25/2012 T
9/26/2012 0.28
9/27/2012 0.26
9/28/2012 0.02
9/29/2012 0.00
9/30/2012 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2011 7:00 AM 0.00 0.0 M M M
10/2/2011 7:00 AM 0.00 0.0 M M M
10/3/2011 7:00 AM 0.00 0.0 M M M
10/4/2011 7:00 AM 0.00 0.0 M M M
10/5/2011 7:00 AM T M M M M A few drops of rain as high base shower clouds moved over station.
10/6/2011 7:00 AM 0.00 0.0 M M M
10/7/2011 7:00 AM 0.00 0.0 M M M
10/8/2011 7:00 AM 0.16 M M M M Upslope precipitation starts during the nightime prior to observation at 7 AM.
10/9/2011 7:00 AM 0.22 M M M M light upslope precipitation through out most of the day. Light rain at the time of the beginning of observation period.
10/10/2011 7:00 AM 0.00 0.0 M M M
10/11/2011 7:00 AM 0.00 0.0 M M M
10/12/2011 7:00 AM 0.00 0.0 M M M
10/13/2011 7:00 AM 0.00 0.0 M M M
10/14/2011 7:00 AM 0.00 0.0 M M M
10/15/2011 7:00 AM 0.00 0.0 M M M
10/16/2011 7:00 AM 0.00 0.0 M M M
10/17/2011 7:00 AM 0.00 0.0 M M M
10/18/2011 7:00 AM 0.03 M M M M Very light rain from a fast moving weather system. The system brought colder temperatures and our first frost to the area this morning.
10/19/2011 7:00 AM 0.00 0.0 M M M
10/20/2011 7:00 AM 0.00 0.0 M M M
10/21/2011 7:00 AM 0.00 0.0 M M M
10/22/2011 7:00 AM 0.00 0.0 M M M
10/23/2011 7:00 AM 0.00 0.0 M M M
10/24/2011 7:00 AM 0.00 0.0 M M M
10/25/2011 7:00 AM 0.00 0.0 M M M
10/26/2011 7:00 AM 0.75 5.0 0.60 5.0 0.60 Precipitation event began as rain at 04:10 PM and changed to snow at 8:05 PM. Rainfall from 4:10 PM through 8 PM amounted to 0.16. Remainder of precipitation total was melted snow. Snowing at the end of observation period (7 AM, Wednesday, 10/26/11).
10/27/2011 7:00 AM 0.21 1.5 0.16 6.5 M Snowing at beginning of observation and precipitation event was a continuation of previous day's snow storm.
10/28/2011 7:00 AM 0.00 0.0 M 4.0 M
10/29/2011 7:00 AM 0.00 0.0 M 0.5 M Total snow depth measured in shaded area. Bare ground in 70% of the area within 250 foot radius of the observation area.
10/30/2011 7:00 AM 0.00 0.0 M 0.0 M
10/31/2011 7:00 AM 0.00 0.0 M M M
11/1/2011 7:00 AM 0.00 0.0 M M M
11/2/2011 7:00 AM 0.54 7.0 0.53 7.0 0.53 Precipitation began as very light rain with thunder and lightning observed from 07:30 PM until 8:15 PM. Rain switched to snow at that point and continued through the night. It was snowing at time of observation. Total rainfall was 0.01 before it switched to snowfall.
11/3/2011 7:00 AM 0.02 T 0.02 3.5 M Snow in the morning and then becoming partly sunny in the afternoon.
11/4/2011 7:00 AM 0.00 0.0 M 2.0 M
11/5/2011 7:00 AM 0.00 0.0 M T M
11/6/2011 7:00 AM T T M M M A trace of mixed rain and snow on a cold blustery day with traces of precipitaion falling all around the metro Denver area.
11/7/2011 7:00 AM 0.00 0.0 M M M
11/8/2011 7:00 AM 0.00 0.0 M M M
11/9/2011 7:00 AM 0.00 0.0 M M M
11/10/2011 7:00 AM 0.00 0.0 M M M
11/11/2011 7:00 AM 0.00 0.0 M M M
11/12/2011 7:00 AM 0.00 0.0 M M M
11/13/2011 7:00 AM 0.00 0.0 M M M
11/14/2011 7:00 AM 0.00 0.0 M M M
11/15/2011 7:00 AM 0.00 0.0 M M M
11/16/2011 7:00 AM 0.00 0.0 M M M
11/17/2011 7:00 AM 0.00 0.0 M M M
11/18/2011 7:00 AM 0.00 0.0 M M M
11/19/2011 7:00 AM 0.00 0.0 M M M
11/20/2011 7:00 AM 0.00 0.0 M M M
11/21/2011 7:00 AM 0.00 0.0 M M M
11/22/2011 7:00 AM 0.00 0.0 M M M
11/23/2011 7:00 AM 0.00 0.0 M M M
11/24/2011 7:00 AM 0.00 0.0 M M M
11/25/2011 7:00 AM 0.00 0.0 M M M
11/26/2011 7:00 AM 0.00 0.0 M M M
11/27/2011 7:00 AM 0.00 0.0 M M M
11/28/2011 7:00 AM 0.00 0.0 M M M
11/29/2011 7:00 AM 0.00 0.0 M M M
11/30/2011 7:00 AM 0.00 0.0 M M M
12/1/2011 7:00 AM 0.27 5.5 0.31 5.5 0.31 Snow began during the night. Snowing at time of observation.
12/2/2011 7:00 AM 0.05 1.3 0.05 5.5 M
12/3/2011 7:00 AM 0.14 4.2 0.15 7.5 M
12/4/2011 7:00 AM 0.05 0.8 0.09 8.0 M
12/5/2011 7:00 AM 0.08 1.0 0.09 8.0 M
12/6/2011 7:00 AM T M M 7.0 M
12/7/2011 7:00 AM 0.00 0.0 0.00 8.0 M
12/8/2011 7:00 AM 0.00 0.0 M 5.0 M
12/9/2011 7:00 AM 0.00 0.0 M 3.5 M
12/10/2011 7:00 AM 0.00 0.0 M 3.0 M
12/11/2011 7:00 AM 0.00 0.0 M 3.0 M
12/12/2011 7:00 AM 0.00 0.0 M 2.0 M
12/13/2011 7:00 AM 0.00 0.0 M 2.0 M
12/14/2011 7:00 AM 0.00 0.0 M 1.0 M
12/15/2011 7:00 AM 0.00 0.0 M 0.5 M
12/16/2011 7:00 AM 0.00 0.0 M 0.0 M
12/17/2011 7:00 AM 0.00 0.0 M M M
12/18/2011 7:00 AM 0.00 0.0 M M M
12/19/2011 7:00 AM 0.00 0.0 M M M
12/20/2011 7:00 AM 0.05 0.7 0.06 0.5 0.06 Very light snow consisting of granular shaped snow.
12/21/2011 7:00 AM 0.00 0.0 0.00 0.5 M
12/22/2011 7:00 AM 0.62 11.3 0.71 11.0 0.71 Moderate snow at time of observation.
12/23/2011 7:00 AM 0.05 0.4 0.05 10.5 M
12/24/2011 7:00 AM 0.00 0.0 M 9.0 M
12/25/2011 7:00 AM 0.00 0.0 M 9.0 M
12/26/2011 7:00 AM 0.00 0.0 M 9.0 M
12/27/2011 7:00 AM 0.00 0.0 M 8.0 M
12/28/2011 7:00 AM 0.00 0.0 M 4.5 M
12/29/2011 7:00 AM 0.00 0.0 M 2.0 M
12/30/2011 7:00 AM 0.00 0.0 M 1.5 M
12/31/2011 7:00 AM 0.00 0.0 M M M
1/1/2012 7:00 AM 0.00 0.0 M M M
1/2/2012 7:00 AM 0.00 0.0 M M M
1/3/2012 7:00 AM 0.00 0.0 M M M
1/4/2012 7:00 AM 0.00 0.0 M M M
1/5/2012 7:00 AM 0.00 0.0 M M M
1/6/2012 7:00 AM 0.00 0.0 M M M
1/7/2012 7:00 AM 0.00 0.0 M M M
1/8/2012 7:00 AM 0.13 1.0 0.11 1.0 0.11
1/9/2012 7:00 AM 0.00 0.0 0.00 0.5 M
1/10/2012 7:00 AM 0.00 0.0 0.00 T M
1/11/2012 7:00 AM 0.02 0.6 0.02 0.6 0.02 Snowing at the beginning of observation period.
1/12/2012 7:00 AM 0.08 3.1 0.13 3.0 0.13 Snowing at the beginning of observation period.
1/13/2012 7:00 AM 0.00 0.0 0.00 T M
1/14/2012 7:00 AM 0.00 0.0 M M M
1/15/2012 7:00 AM 0.00 0.0 M M M
1/16/2012 7:00 AM 0.00 0.0 M M M
1/17/2012 7:00 AM 0.01 0.1 0.01 0.0 0.01 Snow on the ground after the precipitation event was no more than a dusting.
1/18/2012 7:00 AM 0.00 0.0 M M M
1/19/2012 7:00 AM 0.00 0.0 M M M
1/20/2012 7:00 AM 0.00 0.0 M M M
1/21/2012 7:00 AM 0.00 0.0 M M M
1/22/2012 7:00 AM 0.00 0.0 M M M
1/23/2012 7:00 AM 0.00 0.0 M M M
1/24/2012 7:00 AM 0.00 0.0 M M M
1/25/2012 7:00 AM T T T T T Very light snow during the morning.
1/26/2012 7:00 AM 0.00 0.0 M M M
1/27/2012 7:00 AM 0.00 0.0 M M M
1/28/2012 7:00 AM 0.01 0.1 0.01 0.1 0.01 Very light snow during the mid part of the day.
1/29/2012 7:00 AM 0.00 0.0 M M M
1/30/2012 7:00 AM 0.00 0.0 M M M
1/31/2012 7:00 AM 0.00 0.0 M M M
2/1/2012 7:00 AM 0.00 0.0 M M M
2/2/2012 7:00 AM 0.00 0.0 M M M
2/3/2012 7:00 AM 0.63 10.0 0.63 10.0 0.63 Moderate Snow at time of observation.
2/4/2012 7:00 AM 0.27 5.5 0.27 14.0 M Light snow falling at time of observation. Snowing longer than 24 hour observation period.
2/5/2012 7:00 AM T T T 11.0 M
2/6/2012 7:00 AM 0.00 0.0 0.00 11.0 M
2/7/2012 7:00 AM 0.08 2.5 0.08 11.0 M Very light snow at time of observation.
2/8/2012 7:00 AM 0.01 0.2 0.01 10.0 M Snowing at the beginning of the observation.
2/9/2012 7:00 AM 0.00 0.0 0.00 9.0 M
2/10/2012 7:00 AM 0.00 0.0 0.00 7.0 M
2/11/2012 7:00 AM 0.05 1.5 0.05 8.0 M Snowing at the end of the observation period.
2/12/2012 7:00 AM T 1.5 0.05 8.0 M Snowing at beginning of observation period.
2/13/2012 7:00 AM 0.00 0.0 0.00 6.0 M
2/14/2012 7:00 AM 0.00 0.0 0.00 5.5 M
2/15/2012 7:00 AM 0.00 0.0 0.00 5.0 M
2/16/2012 7:00 AM 0.00 0.0 0.00 4.5 M
2/17/2012 7:00 AM 0.00 0.0 0.00 4.0 M Bare Spots in the snow cover.
2/18/2012 7:00 AM 0.00 0.0 0.00 4.0 M Bare spots in the snow cover.
2/19/2012 7:00 AM 0.00 0.0 0.00 3.5 M Bare spots in the snow cover.
2/20/2012 7:00 AM 0.00 0.0 0.00 3.0 M Bare spots in the snow cover.
2/21/2012 7:00 AM 0.00 0.0 0.00 3.0 M Bare spots in the snow cover.
2/22/2012 7:00 AM 0.00 0.0 M M M
2/23/2012 7:00 AM 0.35 3.5 0.35 4.0 M Snowing at time of observation.
2/24/2012 7:00 AM 0.01 0.5 0.01 4.0 M Snowing at the beginning of observation period.
2/25/2012 7:00 AM 0.00 0.0 0.00 2.0 M
2/26/2012 7:00 AM 0.00 0.0 M M M
2/27/2012 7:00 AM 0.00 0.0 M M M
2/28/2012 7:00 AM 0.00 0.0 M M M
2/29/2012 7:00 AM 0.00 0.0 M M M
3/1/2012 7:00 AM 0.00 0.0 M M M
3/2/2012 7:00 AM T T T T T Very light intermittent snow.
3/3/2012 7:00 AM T T T T T Very brief occasional snowflake here and there.
3/4/2012 7:00 AM 0.00 0.0 M M M
3/5/2012 7:00 AM 0.00 0.0 M M M
3/6/2012 7:00 AM 0.00 0.0 M M M
3/7/2012 7:00 AM T 0.0 0.00 0.0 0.00 Very light drizzle falling at time of observation. Temperature is 36 at time of observation but precipitation is liquid.
3/8/2012 7:00 AM T 0.0 0.00 0.0 0.00 Light drizzle through most of the morning. Drizzling at the beginning of the observation period. Did not observe any freezing precipitation.
3/9/2012 7:00 AM 0.00 0.0 M M M
3/10/2012 7:00 AM 0.00 0.0 M M M
3/11/2012 7:00 AM 0.00 0.0 M M M
3/12/2012 7:00 AM T M M M M Very light rain that wetted the sidewalks but amounted to only a trace.
3/13/2012 7:00 AM 0.00 0.0 M M M
3/14/2012 7:00 AM 0.00 0.0 M M M
3/15/2012 7:00 AM 0.00 0.0 M M M
3/16/2012 7:00 AM 0.00 0.0 M M M
3/17/2012 7:00 AM 0.00 0.0 M M M
3/18/2012 7:00 AM 0.00 0.0 M M M
3/19/2012 7:00 AM T 0.0 0.00 0.0 0.00 Brief light light shower after frontal passage that was accompanied by heavy winds.
3/20/2012 7:00 AM 0.00 0.0 M M M
3/21/2012 7:00 AM 0.00 0.0 M M M
3/22/2012 7:00 AM 0.00 0.0 M M M
3/23/2012 7:00 AM 0.00 0.0 M M M
3/24/2012 7:00 AM 0.00 0.0 M M M
3/25/2012 7:00 AM 0.00 0.0 M M M
3/26/2012 7:00 AM 0.00 0.0 M M M
3/27/2012 7:00 AM 0.00 0.0 M M M
3/28/2012 7:00 AM 0.00 0.0 M M M
3/29/2012 7:00 AM 0.00 0.0 M M M
3/30/2012 7:00 AM 0.00 0.0 M M M
3/31/2012 7:00 AM 0.00 0.0 M M M
4/1/2012 7:00 AM 0.00 0.0 M M M
4/2/2012 7:00 AM 0.00 0.0 M M M
4/3/2012 7:00 AM 0.14 0.7 0.05 0.7 0.05 Began as liquid drizzle before changing to snow. Drizzle off and on during the day before steady drizzle begins at 07:45 PM. Snowing at time of observation.
4/4/2012 7:00 AM 0.28 1.0 0.21 1.0 0.21 Snowing at the beginning of observation period
4/5/2012 7:00 AM 0.00 0.0 0.00 T T Trace of snow left in the shade areas.
4/6/2012 7:00 AM 0.00 0.0 M M M
4/7/2012 7:00 AM 0.00 0.0 M M M
4/8/2012 7:00 AM 0.00 0.0 M M M
4/9/2012 7:00 AM 0.00 0.0 M M M
4/10/2012 7:00 AM 0.00 0.0 M M M
4/11/2012 7:00 AM 0.00 0.0 M M M
4/12/2012 7:00 AM 0.13 M M M M Two thundershower events occurred during the observation period. The first event occurred at 4:45 PM and lasted for 15 minutes. Lightning and thunder were observed but only a trace of rain occurred. The second event occurred at 10:55 PM and lasted for 20 minutes. Brief heavy rains with frequent lightning occurred with a minor (one to two stones every second for the first 30 seconds of the event) amount of graupel. It is the second event for which the duration information is listed.
4/13/2012 7:00 AM 0.00 0.0 M M M
4/14/2012 7:00 AM 0.00 0.0 M M M
4/15/2012 7:00 AM 0.52 0.5 M 0.5 M Precipitation began as rain and changed over to snow at 11:35 PM. It did not snow for very long and ended at the time indicated in the duration information section of this report. Snow began to melt as it reached the ground but did accumulate to one half inch before melting. Snow melted before core value could be taken.
4/16/2012 7:00 AM 0.09 T M T M Rain mixed with snow pellets off and on during the duration of the precipitation event. Snow did not accumulate. No core values because snow melted as it reached the ground.
4/17/2012 7:00 AM 0.00 0.0 M M M
4/18/2012 7:00 AM 0.00 0.0 M M M
4/19/2012 7:00 AM 0.00 0.0 M M M
4/20/2012 7:00 AM 0.00 0.0 M M M
4/21/2012 7:00 AM 0.00 0.0 M M M
4/22/2012 7:00 AM 0.00 0.0 M M M
4/23/2012 7:00 AM 0.00 0.0 M M M
4/24/2012 7:00 AM 0.00 0.0 M M M
4/25/2012 7:00 AM 0.00 0.0 M M M
4/26/2012 7:00 AM 0.00 0.0 M M M
4/27/2012 7:00 AM 0.03 M M M M Thundershowers produce a moderate amount of lightning but little rain.
4/28/2012 7:00 AM 0.00 0.0 M M M
4/29/2012 7:00 AM 0.00 0.0 M M M
4/30/2012 7:00 AM 0.00 0.0 M M M
5/1/2012 7:00 AM 0.00 0.0 M M M
5/2/2012 7:00 AM 0.00 0.0 M M M
5/3/2012 7:00 AM 0.00 0.0 M M M
5/4/2012 7:00 AM 0.00 0.0 M M M
5/5/2012 7:00 AM 0.00 0.0 M M M
5/6/2012 7:00 AM 0.01 M M M M Light drizzle beginning just prior to the end of the observation period.
5/7/2012 7:00 AM 0.38 M M M M Upslope rain throughout the observation period.
5/8/2012 7:00 AM 0.32 T T 0.0 0.00 Upslope rain at beginning of observation period with a brief mixture of snow. The mix snow and rain lasted about 5 minutes and occurred around 10:30 AM. Rain event ended at 1:30 PM but a brief drizzle started again at about 09:10 PM and ended before midnight. The nightime drizzle produced 0.04 of precipitation and is included in the 0.32 total.
5/9/2012 7:00 AM 0.00 0.0 M M M
5/10/2012 7:00 AM 0.00 0.0 M M M
5/11/2012 7:00 AM 0.00 0.0 M M M
5/12/2012 7:00 AM 0.21 M M M M
5/13/2012 7:00 AM 0.15 M M M M
5/14/2012 7:00 AM 0.00 0.0 M M M
5/15/2012 7:00 AM 0.00 0.0 M M M
5/16/2012 7:00 AM 0.00 0.0 M M M
5/17/2012 7:00 AM 0.00 0.0 M M M
5/18/2012 7:00 AM 0.00 0.0 M M M
5/19/2012 7:00 AM T M M M M Very infrequent and brief drops of rain thriughout the aftenoon.
5/20/2012 7:00 AM 0.34 M M M M Upslope precipition with a steady light rain. Ended briefly from 2:15 PM until 4 PM then continues until late afternoon.
5/21/2012 7:00 AM T M M M M Very light rain briefly occurred in the afternoon. No thunder or lightning observed.
5/22/2012 7:00 AM 0.00 0.0 M M M
5/23/2012 7:00 AM 0.00 0.0 M M M
5/24/2012 7:00 AM 0.49 M M M M Upslope flow resulted in thundershowers during the evening hours. Thunder and lightning started at about 8:15 PM and lasted for about an hour. No hail observed.
5/25/2012 7:00 AM 0.00 0.0 M M M
5/26/2012 7:00 AM 0.00 0.0 M M M
5/27/2012 7:00 AM 0.00 0.0 M M M
5/28/2012 7:00 AM 0.00 0.0 M M M
5/29/2012 7:00 AM 0.00 0.0 M M M
5/30/2012 7:00 AM 0.00 0.0 M M M
5/31/2012 7:00 AM 0.00 0.0 M M M
6/1/2012 7:00 AM 0.00 0.0 M M M
6/2/2012 7:00 AM T M M M M A few drops from thundershowers in the early afternoon.
6/3/2012 7:00 AM 0.02 M M M M High based thundershowers produced a little precipitation.
6/4/2012 7:00 AM 0.00 0.0 M M M
6/5/2012 7:00 AM 0.00 0.0 M M M
6/6/2012 7:00 AM 0.00 0.0 M M M
6/7/2012 7:00 AM 0.05 M M M M Thundershowers developed late and provided rain in two separate occurrences. The first drops fell at 8:15 PM and produced 0.02. Then later at 10:45 PM an additional 0.03 inches fell. These storms moved to the southeast where much heavier rain and hail occurred. No hail observed at this location.
6/8/2012 7:00 AM 0.00 0.0 M M M
6/9/2012 7:00 AM 0.00 0.0 M M M
6/10/2012 7:00 AM 0.00 0.0 M M M
6/11/2012 7:00 AM 0.00 0.0 M M M
6/12/2012 7:00 AM 0.00 0.0 M M M
6/13/2012 7:00 AM 0.00 0.0 M M M
6/14/2012 7:00 AM 0.00 0.0 M M M
6/15/2012 7:00 AM 0.00 0.0 M M M
6/16/2012 7:00 AM T M M M M Few drops from high base thundershowers.
6/17/2012 7:00 AM T M M M M Thuundershowers in the produce a few drops.
6/18/2012 7:00 AM 0.00 0.0 M M M
6/19/2012 7:00 AM 0.00 0.0 M M M
6/20/2012 7:00 AM 0.00 0.0 M M M
6/21/2012 7:00 AM 0.00 0.0 M M M
6/22/2012 7:00 AM 0.00 0.0 M M M
6/23/2012 7:00 AM 0.00 0.0 M M M
6/24/2012 7:00 AM 0.00 0.0 M M M
6/25/2012 7:00 AM T M M M M High base thundershower produce rain but not enough to wet the streets.
6/26/2012 7:00 AM 0.00 0.0 M M M
6/27/2012 7:00 AM 0.06 M M M M Precipitation from afternoon thundershowers. Precipitation much more widespread over the western portion of the Denver metro area.
6/28/2012 7:00 AM 0.03 M M M M Brief rain from afternoon thundershowers.
6/29/2012 7:00 AM 0.00 0.0 M M M
6/30/2012 7:00 AM 0.01 M M M M Brief thundershower.
7/1/2012 7:00 AM 0.00 0.0 M M M
7/2/2012 7:00 AM 0.00 0.0 M M M
7/3/2012 7:00 AM 0.01 M M M M
7/4/2012 7:00 AM T M M M M
7/5/2012 7:00 AM 0.00 0.0 M M M
7/6/2012 7:00 AM 0.00 0.0 M M M
7/7/2012 7:00 AM 0.75 M M M M Moderate thundershowers in afternoon. No duration information recorded.
7/8/2012 7:00 AM 0.13 M M M M Clouded up early but rains did not begin until after 4 PM. No duration information recorded.
7/9/2012 7:00 AM 0.49 M M M M Beautiful rains began to fall in early afternoon. They were light to moderate in intensity and steady. The afternoon rains were accompanied by light thunder. The rain stopped about 8:05 PM and started up again after 11 PM. The rain which began at about 5 PM dropped 0.14 inches of rain by 8:05 PM. The overnight rain added another 0.35 inches.
7/10/2012 7:00 AM 0.06 M M M M Light rain during late morning. Much heavier rains in downtown Denver and longer ( 4 1/2 hours) in duration.
7/11/2012 7:00 AM 0.00 0.0 M M M
7/12/2012 7:00 AM 0.00 0.0 M M M
7/13/2012 7:00 AM 0.00 0.0 M M M
7/14/2012 7:00 AM 0.00 0.0 M M M
7/15/2012 7:00 AM 0.00 0.0 M M M
7/16/2012 7:00 AM T M M M M A few drops of rain.
7/17/2012 7:00 AM 0.20 M M M M A very mild thundershower pasted over the area during the early evening hours providing light rain over an exttended period of time. This was followed by intermittent light rain falling after dark. The times below reflect when the rain first started and the time when the last intermittent shower stopped.
7/18/2012 7:00 AM 0.02 M M M M Brief very light rain from passing clouds. No thunder or lightning observed.
7/19/2012 7:00 AM 0.00 0.0 M M M
7/20/2012 7:00 AM 0.00 0.0 M M M
7/21/2012 7:00 AM 0.00 0.0 M M M
7/22/2012 7:00 AM 0.00 0.0 M M M
7/23/2012 7:00 AM 0.00 0.0 M M M
7/24/2012 7:00 AM 0.01 M M M M Mild Thundershowers with windy conditions and little rain.
7/25/2012 7:00 AM 0.02 M M M M Late thundershower brought just a little rain.
7/26/2012 7:00 AM 0.00 0.0 M M M
7/27/2012 7:00 AM T M M M M
7/28/2012 7:00 AM 0.56 M M M M
7/29/2012 7:00 AM T M M M M Afternoon shower left a little rain.
7/30/2012 7:00 AM 0.12 M M M M A tenth of an inch fell between 1:10 and 1:17 (see my signifcant weather report. An additional 0.02 fell from 06:05 PM until 06:40 PM. A significant amount of rainfall was observed around 6:15 PM to the northwest but did not drift over this location.
7/31/2012 7:00 AM 0.06 M M M M Very light rain from thundershowers in the area.
8/1/2012 7:00 AM 0.36 M M M M Strong thunderstorm moved quickly over the area and produced graupel and heavy rain for a brief period of time. See significant weather report for July 31, 2012.
8/2/2012 7:00 AM 0.03 M M M M Brief rain from nearby thunder shower .
8/3/2012 7:00 AM 0.00 0.0 M M M
8/4/2012 7:00 AM 0.00 0.0 M M M
8/5/2012 7:00 AM 0.00 0.0 M M M
8/6/2012 7:00 AM 0.00 0.0 M M M
8/7/2012 7:00 AM 0.00 0.0 M M M
8/8/2012 7:00 AM 0.00 0.0 M M M
8/9/2012 7:00 AM 0.00 0.0 M M M
8/10/2012 7:00 AM 0.00 0.0 M M M
8/11/2012 7:00 AM T M M M M Trace of rain late evening. No thunder observed.
8/12/2012 7:00 AM 0.16 M M M M Fast moving thunder shower of moderate intensity passed through the area.
8/13/2012 7:00 AM 0.00 0.0 M M M
8/14/2012 7:00 AM 0.00 0.0 M M M
8/15/2012 7:00 AM 0.00 0.0 M M M
8/16/2012 7:00 AM 0.00 0.0 M M M
8/17/2012 7:00 AM 0.00 0.0 M M M
8/18/2012 7:00 AM 0.00 0.0 M M M
8/19/2012 7:00 AM 0.00 0.0 M M M
8/20/2012 7:00 AM 0.00 0.0 M M M
8/21/2012 7:00 AM 0.00 0.0 M M M
8/22/2012 7:00 AM 0.00 0.0 M M M
8/23/2012 7:00 AM 0.01 M M M M A very light rain during rush hour.
8/24/2012 7:00 AM 0.00 0.0 M M M
8/25/2012 7:00 AM 0.00 0.0 M M M
8/26/2012 7:00 AM 0.00 0.0 M M M
8/27/2012 7:00 AM 0.00 0.0 M M M
8/28/2012 7:00 AM T M M M M A few drops of rain from a passing cloud.
8/29/2012 7:00 AM 0.00 0.0 M M M
8/30/2012 7:00 AM T M M M M
8/31/2012 7:00 AM 0.00 0.0 M M M
9/1/2012 7:00 AM 0.00 0.0 M M M
9/2/2012 7:00 AM T M M M M
9/3/2012 7:00 AM 0.00 0.0 M M M
9/4/2012 7:00 AM 0.00 0.0 M M M
9/5/2012 7:00 AM 0.00 0.0 M M M
9/6/2012 7:00 AM 0.00 0.0 M M M
9/7/2012 7:00 AM 0.00 0.0 M M M
9/8/2012 7:00 AM 0.00 0.0 M M M
9/9/2012 7:00 AM 0.00 0.0 M M M
9/10/2012 7:00 AM 0.00 0.0 M M M
9/11/2012 7:00 AM 0.00 0.0 M M M
9/12/2012 7:00 AM 0.71 M M M M A much needed steady rain that increase in intensity until 4AM. It has maintained that intensity up to and through the observation time. Raining at time of observation.
9/13/2012 7:00 AM 0.45 M M M M Raining at the beginning of observation time period.
9/14/2012 7:00 AM 0.00 0.0 M M M
9/15/2012 7:00 AM 0.00 0.0 M M M
9/16/2012 7:00 AM 0.00 0.0 M M M
9/17/2012 7:00 AM 0.00 0.0 M M M
9/18/2012 7:00 AM 0.00 0.0 M M M
9/19/2012 7:00 AM 0.00 0.0 M M M
9/20/2012 7:00 AM 0.00 0.0 M M M
9/21/2012 7:00 AM 0.00 0.0 M M M
9/22/2012 7:00 AM 0.00 0.0 M M M
9/23/2012 7:00 AM 0.00 0.0 M M M
9/24/2012 7:00 AM 0.00 0.0 M M M
9/25/2012 7:00 AM T M M M M A brief drizzle just after the observation period begins.
9/26/2012 7:00 AM 0.28 M M M M Upslope precipitation begins late evening. Clouds and sun throughout the day.
9/27/2012 7:00 AM 0.26 M M M M A lot of convective activity beginning around 4 PM. It matured at around 8:30 PM and produced brief heavy rain.
9/28/2012 7:00 AM 0.02 0.0 M M M Light drizzle over night.
9/29/2012 7:00 AM 0.00 0.0 M M M
9/30/2012 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



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
7/31/2012 1:16 PM Hail was graupel NA NA 1/4" Pea Size Soft|White Ice 5 1min minor leaf damage Continuous True Same time as rain 10-20