Station Overview Station Location
Station Number MD-MG-74 Latitude 39.074061
Station Name Rockville 0.6 SE Longitude -77.146312
County Montgomery Elevation (ft) 413



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 3.44 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Nov 11 3.56 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Dec 11 3.11 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Jan 12 2.92 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Feb 12 2.75 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
March 12 3.73 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
April 12 3.29 2.09 16 2.09 16 0.00 0 0 6 0 0.0 0 0
May 12 4.20 3.74 29 3.74 29 0.00 0 0 15 0 0.0 0 0
June 12 3.81 3.32 25 3.32 25 0.00 0 0 9 2 0.0 0 0
July 12 3.90 4.25 22 4.25 22 0.00 0 0 11 1 0.0 0 0
Aug 12 3.19 3.79 22 3.79 22 0.00 0 0 10 1 0.0 0 0
Sept 12 4.00 1.82 24 1.82 24 0.00 0 0 8 2 0.0 0 0
Water Year Totals: 41.90" 19.01" 138 days 19.01" 138 0.00" 0 days 0 59 days 6 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
10/1/2011
10/2/2011
10/3/2011
10/4/2011
10/5/2011
10/6/2011
10/7/2011
10/8/2011
10/9/2011
10/10/2011
10/11/2011
10/12/2011
10/13/2011
10/14/2011
10/15/2011
10/16/2011
10/17/2011
10/18/2011
10/19/2011
10/20/2011
10/21/2011
10/22/2011
10/23/2011
10/24/2011
10/25/2011
10/26/2011
10/27/2011
10/28/2011
10/29/2011
10/30/2011
10/31/2011
11/1/2011
11/2/2011
11/3/2011
11/4/2011
11/5/2011
11/6/2011
11/7/2011
11/8/2011
11/9/2011
11/10/2011
11/11/2011
11/12/2011
11/13/2011
11/14/2011
11/15/2011
11/16/2011
11/17/2011
11/18/2011
11/19/2011
11/20/2011
11/21/2011
11/22/2011
11/23/2011
11/24/2011
11/25/2011
11/26/2011
11/27/2011
11/28/2011
11/29/2011
11/30/2011
12/1/2011
12/2/2011
12/3/2011
12/4/2011
12/5/2011
12/6/2011
12/7/2011
12/8/2011
12/9/2011
12/10/2011
12/11/2011
12/12/2011
12/13/2011
12/14/2011
12/15/2011
12/16/2011
12/17/2011
12/18/2011
12/19/2011
12/20/2011
12/21/2011
12/22/2011
12/23/2011
12/24/2011
12/25/2011
12/26/2011
12/27/2011
12/28/2011
12/29/2011
12/30/2011
12/31/2011
Day of YearDaily PrcpMultiday Prcp
1/1/2012
1/2/2012
1/3/2012
1/4/2012
1/5/2012
1/6/2012
1/7/2012
1/8/2012
1/9/2012
1/10/2012
1/11/2012
1/12/2012
1/13/2012
1/14/2012
1/15/2012
1/16/2012
1/17/2012
1/18/2012
1/19/2012
1/20/2012
1/21/2012
1/22/2012
1/23/2012
1/24/2012
1/25/2012
1/26/2012
1/27/2012
1/28/2012
1/29/2012
1/30/2012
1/31/2012
2/1/2012
2/2/2012
2/3/2012
2/4/2012
2/5/2012
2/6/2012
2/7/2012
2/8/2012
2/9/2012
2/10/2012
2/11/2012
2/12/2012
2/13/2012
2/14/2012
2/15/2012
2/16/2012
2/17/2012
2/18/2012
2/19/2012
2/20/2012
2/21/2012
2/22/2012
2/23/2012
2/24/2012
2/25/2012
2/26/2012
2/27/2012
2/28/2012
2/29/2012
3/1/2012
3/2/2012
3/3/2012
3/4/2012
3/5/2012
3/6/2012
3/7/2012
3/8/2012
3/9/2012
3/10/2012
3/11/2012
3/12/2012
3/13/2012
3/14/2012
3/15/2012
3/16/2012
3/17/2012
3/18/2012
3/19/2012
3/20/2012
3/21/2012
3/22/2012
3/23/2012
3/24/2012
3/25/2012
3/26/2012
3/27/2012
3/28/2012
3/29/2012
3/30/2012
3/31/2012
Day of YearDaily PrcpMultiday Prcp
4/1/2012
4/2/2012
4/3/2012
4/4/2012
4/5/2012
4/6/2012
4/7/2012
4/8/2012
4/9/2012
4/10/2012
4/11/2012
4/12/2012
4/13/2012
4/14/2012
4/15/2012 0.00
4/16/2012 0.00
4/17/2012 0.00
4/18/2012 0.00
4/19/2012 0.26
4/20/2012 0.00
4/21/2012 0.00
4/22/2012 0.15
4/23/2012 1.29
4/24/2012 0.10
4/25/2012 0.00
4/26/2012 0.00
4/27/2012 0.10
4/28/2012 0.00
4/29/2012 0.19
4/30/2012 0.00
5/1/2012 0.11
5/2/2012 0.00
5/3/2012 0.00
5/4/2012 0.02
5/5/2012 0.00
5/6/2012 0.00
5/7/2012 0.00
5/8/2012 0.00
5/9/2012 0.35
5/10/2012 0.35
5/11/2012 0.00
5/12/2012 0.00
5/13/2012 0.00
5/14/2012 0.02
5/15/2012 1.06
5/16/2012 0.01
5/17/2012 0.00
5/18/2012 0.00
5/19/2012 0.00
5/20/2012
5/21/2012 0.23
5/22/2012 0.45
5/23/2012 0.02
5/24/2012 0.15
5/25/2012 0.02
5/26/2012 0.00
5/27/2012
5/28/2012 0.26
5/29/2012 0.00
5/30/2012 0.68
5/31/2012 0.01
6/1/2012 0.00
6/2/2012 1.25
6/3/2012 0.00
6/4/2012 0.00
6/5/2012 0.00
6/6/2012 0.00
6/7/2012 T
6/8/2012 0.02
6/9/2012 0.00
6/10/2012 0.00
6/11/2012 0.00
6/12/2012 0.08
6/13/2012 0.66
6/14/2012 0.01
6/15/2012 T
6/16/2012 0.00
6/17/2012 0.00
6/18/2012 0.09
6/19/2012 0.03
6/20/2012
6/21/2012
6/22/2012
6/23/2012
6/24/2012
6/25/2012 0.44
6/26/2012 0.00
6/27/2012 0.00
6/28/2012 0.00
6/29/2012 0.00
6/30/2012 0.74
Day of YearDaily PrcpMultiday Prcp
7/1/2012 0.00
7/2/2012 0.02
7/3/2012
7/4/2012 0.13
7/5/2012 0.00
7/6/2012 0.00
7/7/2012 0.00
7/8/2012
7/9/2012 0.15
7/10/2012 0.10
7/11/2012 0.00
7/12/2012 0.00
7/13/2012 0.00
7/14/2012 0.77
7/15/2012 0.01
7/16/2012 0.04
7/17/2012 0.00
7/18/2012 0.00
7/19/2012 T
7/20/2012 1.95
7/21/2012 0.82
7/22/2012 0.24
7/23/2012 0.02
7/24/2012
7/25/2012
7/26/2012
7/27/2012 0.00
7/28/2012
7/29/2012
7/30/2012
7/31/2012
8/1/2012
8/2/2012
8/3/2012
8/4/2012
8/5/2012
8/6/2012
8/7/2012
8/8/2012 0.00
8/9/2012 0.61
8/10/2012 0.69
8/11/2012 0.15
8/12/2012 0.69
8/13/2012 0.00
8/14/2012 0.05
8/15/2012 0.00
8/16/2012 0.00
8/17/2012 0.00
8/18/2012 0.14
8/19/2012 0.01
8/20/2012
8/21/2012
8/22/2012 0.00
8/23/2012 1.28
8/24/2012 0.00
8/25/2012 0.00
8/26/2012 T
8/27/2012 0.15
8/28/2012 0.02
8/29/2012 0.00
8/30/2012 0.00
8/31/2012 0.00
9/1/2012 0.00
9/2/2012 0.00
9/3/2012 0.05
9/4/2012 0.02
9/5/2012 0.00
9/6/2012
9/7/2012 0.03
9/8/2012
9/9/2012
9/10/2012
9/11/2012
9/12/2012 0.00
9/13/2012 0.00
9/14/2012 0.00
9/15/2012 0.00
9/16/2012 0.00
9/17/2012 0.00
9/18/2012 0.16
9/19/2012 0.94
9/20/2012 0.00
9/21/2012 0.00
9/22/2012
9/23/2012 0.02
9/24/2012 0.00
9/25/2012 0.00
9/26/2012 0.09
9/27/2012 T
9/28/2012 0.51
9/29/2012 T
9/30/2012 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
4/15/2012 7:00 AM 0.00 0.0 M M M
4/16/2012 7:00 AM 0.00 0.0 M M M
4/17/2012 7:00 AM 0.00 0.0 M M M Yesterday was mostly sunny and very warm. Temps reached into the 90's. Clear overnight.
4/18/2012 7:00 AM 0.00 0.0 M M M Partly cloudy. Temp in the mid 70s yesterday. Very cloudy right now.
4/19/2012 7:00 AM 0.26 0.0 M M M Rain started in the morning and ended last night. It rained lightly.
4/20/2012 7:02 AM 0.00 0.0 M M M
4/21/2012 7:02 AM 0.00 0.0 M M M
4/22/2012 7:00 AM 0.15 M M M M Rain happened sometime between 6:00pm and 10:00pm.
4/23/2012 7:08 AM 1.29 M M M M Rained continuously from about noon to midnight. Rain resumed sometime between midnight and 7am. It was raining at observation time.
4/24/2012 7:25 AM 0.10 M M M M Completely overcast with light rain to drizzle off and on throughout the day, except at about 3:30pm when it briefly rained hard. No accumulation overnight. Skies were mostly clear at observation time, with just high clouds.
4/25/2012 7:15 AM 0.00 0.0 M M M
4/26/2012 7:20 AM 0.00 0.0 M M M
4/27/2012 6:58 AM 0.10 M M M M We had two periods of light rain. The first was in the morning, starting at about 8am. No sure how long it lasted, but it definitely stopped sometime before noon. It started to rain again late in the evening (about 11pm). No rain at observation time. Skies mostly cloudy.
4/28/2012 7:00 AM 0.00 0.0 M M M
4/29/2012 7:05 AM 0.19 M M M M Gentle rain, off and on, Started after 3pm in the afternoon and continued past 11pm. Stopped sometime in the overnight. Sky is clear at observation time.
4/30/2012 7:11 AM 0.00 0.0 M M M
5/1/2012 7:09 AM 0.11 M M M M Rain started after 2:00 AM and paused a couple minutes ago. Looks like it may rain more any minute.
5/2/2012 7:08 AM 0.00 0.0 M M M
5/3/2012 7:05 AM 0.00 0.0 M M M Very over cast right now.
5/4/2012 7:19 AM 0.02 M M M M The rain came from a thunder storm.
5/5/2012 6:58 AM 0.00 0.0 M M M
5/6/2012 11:27 AM 0.00 0.0 M M M There was very light precipitation (drizzle) early this morning (around 6:30 am), but no accumulation.
5/7/2012 7:04 AM 0.00 0.0 M M M
5/8/2012 7:00 AM 0.00 0.0 M M M
5/9/2012 7:00 AM 0.35 M M M M It rained two times.
5/10/2012 7:00 AM 0.35 M M M M
5/11/2012 7:05 AM 0.00 0.0 M M M
5/12/2012 7:00 AM 0.00 0.0 M M M
5/13/2012 7:29 AM 0.00 0.0 M M M It was a little bit cloudy.
5/14/2012 7:10 AM 0.02 M M M M It is raining right now and rain started over night.
5/15/2012 7:00 AM 1.06 M M M M It rained all day yesterday
5/16/2012 7:35 AM 0.01 M M M M
5/17/2012 7:10 AM 0.00 0.0 M M M Wind with chilly breezes
5/18/2012 7:23 AM 0.00 0.0 M M M
5/19/2012 8:19 AM 0.00 0.0 M M M
5/21/2012 7:20 AM 0.23 M M M M Rain started at midnight.
5/22/2012 7:00 AM 0.45 M M M M Rained off and on, sometimes heavy most of the day yesterday. Heavy rainfall was mostly before noon. At 5pm accumulation was approximately 3 tenths of an inch. Additional rainfall overnight. Rain is falling right now, but very lightly.
5/23/2012 7:26 AM 0.02 M M M M
5/24/2012 7:00 AM 0.15 M M M M
5/25/2012 7:28 AM 0.02 M M M M
5/26/2012 7:06 AM 0.00 0.0 M M M
5/28/2012 7:00 AM 0.26 M M M M Heavy rain from a thunderstorm. Rain started at about 9pm and stopped by 9:20pm
5/29/2012 7:00 AM 0.00 0.0 M M M
5/30/2012 7:13 AM 0.68 M M M M We had a flash flood warning.
5/31/2012 7:29 AM 0.01 M M M M
6/1/2012 7:28 AM 0.00 0.0 M M M
6/2/2012 7:00 AM 1.25 M M M M We had a tornado watch and warning.
6/3/2012 7:33 AM 0.00 0.0 M M M
6/4/2012 7:07 AM 0.00 0.0 M M M
6/5/2012 7:07 AM 0.00 0.0 M M M
6/6/2012 7:15 AM 0.00 0.0 M M M
6/7/2012 7:00 AM T M M M M We had sprinkles
6/8/2012 7:13 AM 0.02 M M M M brief thunderstorm
6/9/2012 7:00 AM 0.00 0.0 M M M
6/10/2012 7:32 AM 0.00 0.0 M M M
6/11/2012 7:27 AM 0.00 0.0 M M M
6/12/2012 7:10 AM 0.08 M M M M
6/13/2012 7:30 AM 0.66 M M M M
6/14/2012 7:20 AM 0.01 M M M M
6/15/2012 7:49 AM T M M M M
6/16/2012 8:42 AM 0.00 0.0 M M M
6/17/2012 8:41 AM 0.00 0.0 M M M
6/18/2012 7:42 AM 0.09 M M M M
6/19/2012 7:30 AM 0.03 M M M M
6/25/2012 7:00 AM 0.44 M M M M
6/26/2012 7:54 AM 0.00 0.0 M M M
6/27/2012 7:52 AM 0.00 0.0 M M M
6/28/2012 7:57 AM 0.00 0.0 M M M
6/29/2012 7:59 AM 0.00 0.0 M M M
6/30/2012 8:00 AM 0.74 M M M M severe thunderstorm, began at about 10:30 pm. Heavy rain lasted for about 30 minutes
7/1/2012 7:00 AM 0.00 0.0 M M M
7/2/2012 7:00 AM 0.02 M M M M
7/4/2012 7:00 AM 0.13 M M M M
7/5/2012 7:57 AM 0.00 0.0 M M M
7/6/2012 7:00 AM 0.00 0.0 M M M
7/7/2012 7:42 AM 0.00 0.0 M M M
7/9/2012 7:40 AM 0.15 M M M M
7/10/2012 7:00 AM 0.10 M M M M
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 7:20 AM 0.00 0.0 M M M
7/14/2012 7:44 AM 0.77 M M M M
7/15/2012 8:58 AM 0.01 M M M M
7/16/2012 7:00 AM 0.04 M M M M
7/17/2012 7:33 AM 0.00 0.0 M M M
7/18/2012 7:00 AM 0.00 0.0 M M M
7/19/2012 7:10 AM T M M M M
7/20/2012 7:22 AM 1.95 M M M M
7/21/2012 7:14 AM 0.82 M M M M
7/22/2012 7:36 AM 0.24 M M M M
7/23/2012 6:00 AM 0.02 M M M M
7/27/2012 7:00 AM 0.00 0.0 M M M
8/8/2012 7:20 AM 0.00 0.0 M M M
8/9/2012 8:25 AM 0.61 M M M M
8/10/2012 8:18 AM 0.69 M M M M
8/11/2012 9:21 AM 0.15 M M M M
8/12/2012 8:50 AM 0.69 M M M M
8/13/2012 7:00 AM 0.00 0.0 M M M
8/14/2012 7:31 AM 0.05 M M M M
8/15/2012 7:58 AM 0.00 0.0 M M M
8/16/2012 9:33 AM 0.00 0.0 M M M
8/17/2012 7:00 AM 0.00 0.0 M M M
8/18/2012 7:51 AM 0.14 M M M M
8/19/2012 9:02 AM 0.01 M M M M
8/22/2012 7:37 AM 0.00 0.0 M M M
8/23/2012 6:03 AM 1.28 M M M M Heavy rain started at 6:40 PM. We checked the gauge at 7:05 PM and it read 0.94 inches.
8/24/2012 8:02 AM 0.00 0.0 M M M
8/25/2012 7:00 AM 0.00 0.0 M M M
8/26/2012 7:43 AM T M M M M
8/27/2012 7:09 AM 0.15 M M M M
8/28/2012 7:18 AM 0.02 M M M M
8/29/2012 7:22 AM 0.00 0.0 M M M
8/30/2012 7:11 AM 0.00 0.0 M M M
8/31/2012 7:13 AM 0.00 0.0 M M M
9/1/2012 8:30 AM 0.00 0.0 M M M
9/2/2012 7:16 AM 0.00 0.0 M M M
9/3/2012 7:36 AM 0.05 M M M M
9/4/2012 7:08 AM 0.02 M M M M
9/5/2012 7:03 AM 0.00 0.0 M M M
9/7/2012 7:36 AM 0.03 M M M M
9/12/2012 7:20 AM 0.00 0.0 M M M
9/13/2012 7:20 AM 0.00 0.0 M M M
9/14/2012 7:36 AM 0.00 0.0 M M M
9/15/2012 7:05 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 0.16 M M M M
9/19/2012 6:56 AM 0.94 M M M M
9/20/2012 7:01 AM 0.00 0.0 M M M
9/21/2012 7:00 AM 0.00 0.0 M M M
9/23/2012 9:52 AM 0.02 M M M M
9/24/2012 7:20 AM 0.00 0.0 M M M
9/25/2012 7:28 AM 0.00 0.0 M M M
9/26/2012 7:02 AM 0.09 M M M M
9/27/2012 7:27 AM T M M M M
9/28/2012 7:36 AM 0.51 M M M M
9/29/2012 7:00 AM T M M M M
9/30/2012 8:05 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