Station Overview Station Location
Station Number MD-MG-20 Latitude 39.1038
Station Name Colesville 1.1 NNW Longitude -77.012605
County Montgomery Elevation (ft) 440



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 3.55 2.19 3 2.19 3 0.00 0 0 3 0 0.0 0 0
Nov 09 3.55 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Dec 09 3.30 2.51 3 2.51 3 0.00 0 0 3 0 23.2 2 1
Jan 10 3.02 0.38 1 0.38 1 0.00 0 0 1 0 6.9 1 1
Feb 10 2.87 0.00 0 0.00 0 0.00 0 0 0 0 29.8 2 2
March 10 3.84 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
April 10 3.43 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
May 10 4.29 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
June 10 3.97 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
July 10 4.04 0.00 1 0.00 1 0.00 0 0 0 1 0.0 0 0
Aug 10 3.22 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Sept 10 4.07 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Water Year Totals: 43.15" 5.08" 8 days 5.08" 8 0.00" 0 days 0 7 days 1 days 59.9" 5 days 4 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
10/2/2009
10/3/2009
10/4/2009
10/5/2009
10/6/2009
10/7/2009
10/8/2009
10/9/2009
10/10/2009
10/11/2009
10/12/2009
10/13/2009
10/14/2009
10/15/2009
10/16/2009
10/17/2009
10/18/2009
10/19/2009
10/20/2009
10/21/2009
10/22/2009
10/23/2009
10/24/2009
10/25/2009 0.36
10/26/2009
10/27/2009 0.67
10/28/2009 1.16
10/29/2009
10/30/2009
10/31/2009
11/1/2009
11/2/2009
11/3/2009
11/4/2009
11/5/2009
11/6/2009
11/7/2009
11/8/2009
11/9/2009
11/10/2009
11/11/2009
11/12/2009
11/13/2009
11/14/2009
11/15/2009
11/16/2009
11/17/2009
11/18/2009
11/19/2009
11/20/2009
11/21/2009
11/22/2009
11/23/2009
11/24/2009
11/25/2009
11/26/2009
11/27/2009
11/28/2009
11/29/2009
11/30/2009
12/1/2009
12/2/2009
12/3/2009
12/4/2009
12/5/2009
12/6/2009 0.73
12/7/2009
12/8/2009
12/9/2009
12/10/2009
12/11/2009
12/12/2009
12/13/2009
12/14/2009
12/15/2009
12/16/2009
12/17/2009
12/18/2009
12/19/2009
12/20/2009 1.55
12/21/2009
12/22/2009
12/23/2009
12/24/2009
12/25/2009
12/26/2009
12/27/2009
12/28/2009
12/29/2009
12/30/2009
12/31/2009 0.23
Day of YearDaily PrcpMultiday Prcp
1/1/2010
1/2/2010
1/3/2010
1/4/2010
1/5/2010
1/6/2010
1/7/2010
1/8/2010
1/9/2010
1/10/2010
1/11/2010
1/12/2010
1/13/2010
1/14/2010
1/15/2010
1/16/2010
1/17/2010
1/18/2010
1/19/2010
1/20/2010
1/21/2010
1/22/2010
1/23/2010
1/24/2010
1/25/2010
1/26/2010
1/27/2010
1/28/2010
1/29/2010
1/30/2010
1/31/2010 0.38
2/1/2010
2/2/2010
2/3/2010
2/4/2010
2/5/2010
2/6/2010 M
2/7/2010 M
2/8/2010
2/9/2010
2/10/2010
2/11/2010
2/12/2010
2/13/2010
2/14/2010
2/15/2010
2/16/2010
2/17/2010
2/18/2010
2/19/2010
2/20/2010
2/21/2010
2/22/2010
2/23/2010
2/24/2010
2/25/2010
2/26/2010
2/27/2010
2/28/2010
3/1/2010
3/2/2010
3/3/2010
3/4/2010
3/5/2010
3/6/2010
3/7/2010
3/8/2010
3/9/2010
3/10/2010
3/11/2010
3/12/2010
3/13/2010
3/14/2010
3/15/2010
3/16/2010
3/17/2010
3/18/2010
3/19/2010
3/20/2010
3/21/2010
3/22/2010
3/23/2010
3/24/2010
3/25/2010
3/26/2010
3/27/2010
3/28/2010
3/29/2010
3/30/2010
3/31/2010
Day of YearDaily PrcpMultiday Prcp
4/1/2010
4/2/2010
4/3/2010
4/4/2010
4/5/2010
4/6/2010
4/7/2010
4/8/2010
4/9/2010
4/10/2010
4/11/2010
4/12/2010
4/13/2010
4/14/2010
4/15/2010
4/16/2010
4/17/2010
4/18/2010
4/19/2010
4/20/2010
4/21/2010
4/22/2010
4/23/2010
4/24/2010
4/25/2010
4/26/2010
4/27/2010
4/28/2010
4/29/2010
4/30/2010
5/1/2010
5/2/2010
5/3/2010
5/4/2010
5/5/2010
5/6/2010
5/7/2010
5/8/2010
5/9/2010
5/10/2010
5/11/2010
5/12/2010
5/13/2010
5/14/2010
5/15/2010
5/16/2010
5/17/2010
5/18/2010
5/19/2010
5/20/2010
5/21/2010
5/22/2010
5/23/2010
5/24/2010
5/25/2010
5/26/2010
5/27/2010
5/28/2010
5/29/2010
5/30/2010
5/31/2010
6/1/2010
6/2/2010
6/3/2010
6/4/2010
6/5/2010
6/6/2010
6/7/2010
6/8/2010
6/9/2010
6/10/2010
6/11/2010
6/12/2010
6/13/2010
6/14/2010
6/15/2010
6/16/2010
6/17/2010
6/18/2010
6/19/2010
6/20/2010
6/21/2010
6/22/2010
6/23/2010
6/24/2010
6/25/2010
6/26/2010
6/27/2010
6/28/2010
6/29/2010
6/30/2010
Day of YearDaily PrcpMultiday Prcp
7/1/2010
7/2/2010
7/3/2010
7/4/2010
7/5/2010
7/6/2010
7/7/2010
7/8/2010
7/9/2010
7/10/2010
7/11/2010
7/12/2010
7/13/2010
7/14/2010
7/15/2010
7/16/2010
7/17/2010
7/18/2010
7/19/2010
7/20/2010
7/21/2010 T
7/22/2010
7/23/2010
7/24/2010
7/25/2010
7/26/2010
7/27/2010
7/28/2010
7/29/2010
7/30/2010
7/31/2010
8/1/2010
8/2/2010
8/3/2010
8/4/2010
8/5/2010
8/6/2010
8/7/2010
8/8/2010
8/9/2010
8/10/2010
8/11/2010
8/12/2010
8/13/2010
8/14/2010
8/15/2010
8/16/2010
8/17/2010
8/18/2010
8/19/2010
8/20/2010
8/21/2010
8/22/2010
8/23/2010
8/24/2010
8/25/2010
8/26/2010
8/27/2010
8/28/2010
8/29/2010
8/30/2010
8/31/2010
9/1/2010
9/2/2010
9/3/2010
9/4/2010
9/5/2010
9/6/2010
9/7/2010
9/8/2010
9/9/2010
9/10/2010
9/11/2010
9/12/2010
9/13/2010
9/14/2010
9/15/2010
9/16/2010
9/17/2010
9/18/2010
9/19/2010
9/20/2010
9/21/2010
9/22/2010
9/23/2010
9/24/2010
9/25/2010
9/26/2010
9/27/2010
9/28/2010
9/29/2010
9/30/2010



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/25/2009 10:00 AM 0.36 M M M M Brief shower/sprinkles around midday on the 23rd. Light off and on late afternoon on the 23rd through early afternoon on the 24th. Brief moderate to heavy mid afternoon on the 24th. Some sunshine by late afternoon on the 24th. Storm total of 0.36" from midday on the 23rd till late afternoon on the 24th.
10/27/2009 10:00 AM 0.67 M M M M Light to moderate rain overnight/early morning
10/28/2009 10:00 AM 1.16 M M M M
12/6/2009 7:00 AM 0.73 M M M M rain began around 7AM and changed to snow 9AM-10AM. Big flakes and moderate snow morning. Lighter snow midday thru afternoon and ending early evening. Snow measured on deck table at 2.5" at 1PM and another 1.5" 1PM to ending around 8PM.
12/20/2009 7:00 AM 1.55 22.1 M 20.0 M 10.6" 9:15PM Dec 18 to noon Dec 19 3.8" noon Dec 19 to 2:10PM Dec 19 7.7" 2:10PM Dec 19 to 6AM Dec 20 Total= 22.1" second largest snow storm since 1984
12/31/2009 11:00 AM 0.23 1.1 M M M Precip probably began around 3-3:15AM as max temp of 32F overnight occurred around 3:15AM.
1/31/2010 9:00 AM 0.38 6.9 M 6.0 M 6.3" by 4:30PM Jan 30. Another 0.6" after 4:30PM till end.
2/6/2010 10:00 AM M 24.5 M 24.0 M 2" measured at 4:30PM Feb 5; another 7.5" 4:30PM Feb 5 to 10PM Feb 5; another 15" 10PM Feb 5 to 10AM Feb 6 for a total so far of 24.5".
2/7/2010 7:00 AM M 5.3 M 27.0 M Additional 4.5" 10AM-2PM Feb 6; additional 0.8" 2PM to 4:30PM total for storm=29.8"
7/21/2010 10:00 AM T M M M M Gust front with stronger winds around 8:30PM July 20 followed by a brief period of light rain.



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