Station Overview Station Location
Station Number MD-MG-103 Latitude 39.152565
Station Name Dickerson 6.6 SW Longitude -77.510361
County Montgomery Elevation (ft) 228



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 19 3.19 4.25 31 4.25 31 0.00 0 0 13 2 0.0 0 0
Nov 19 3.40 2.33 30 2.33 28 0.00 2 1 8 1 0.0 0 0
Dec 19 2.94 3.71 31 3.71 31 0.00 0 0 14 1 1.5 2 2
Jan 20 2.58 3.46 31 3.46 31 0.00 0 0 10 3 2.3 1 1
Feb 20 2.53 3.31 29 3.31 29 0.00 0 0 16 2 0.0 0 0
March 20 3.52 2.49 31 2.49 31 0.00 0 0 18 3 0.0 0 0
April 20 3.32 4.20 30 4.20 30 0.00 0 0 17 2 0.0 0 0
May 20 4.46 2.68 31 2.68 31 0.00 0 0 10 2 0.0 0 0
June 20 3.77 5.79 30 5.79 30 0.00 0 0 11 2 0.0 0 0
July 20 3.65 2.39 29 2.39 22 0.00 7 0 6 2 0.0 0 0
Aug 20 3.22 8.71 32 8.71 26 0.00 6 3 19 1 0.0 0 0
Sept 20 3.89 3.00 30 3.00 28 0.00 2 1 8 2 0.0 0 0
Water Year Totals: 40.47" 46.32" 365 days 46.32" 348 0.00" 17 days 5 150 days 23 days 3.8" 3 days 3 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
10/1/2019 0.43
10/2/2019 0.00
10/3/2019 0.00
10/4/2019 0.00
10/5/2019 0.00
10/6/2019 0.00
10/7/2019 0.01
10/8/2019 0.31
10/9/2019 0.04
10/10/2019 0.01
10/11/2019 0.00
10/12/2019 T
10/13/2019 T
10/14/2019 0.00
10/15/2019 0.00
10/16/2019 0.00
10/17/2019 0.96
10/18/2019 0.00
10/19/2019 0.00
10/20/2019 0.16
10/21/2019 0.37
10/22/2019 0.00
10/23/2019 0.41
10/24/2019 0.00
10/25/2019 0.00
10/26/2019 0.00
10/27/2019 0.63
10/28/2019 0.54
10/29/2019 0.01
10/30/2019 0.00
10/31/2019 0.37
11/1/2019 1.27
11/2/2019 0.00
11/3/2019 0.00
11/4/2019 0.00
11/5/2019 0.00
11/6/2019 0.00
11/7/2019 0.00
11/8/2019 0.14
11/9/2019 0.00
11/10/2019 0.00
11/11/2019 0.00
11/12/2019 0.11
11/13/2019 T
11/14/2019 0.00
11/15/2019 0.00
11/16/2019 0.00
11/17/2019 0.00
11/18/2019 0.01
11/19/2019 0.05
11/20/2019 0.00
11/21/2019 0.00
11/22/2019 0.00
11/23/2019 0.00
11/24/2019 0.73
11/25/2019 0.01
11/26/2019 0.00
11/27/2019 0.01
11/28/2019 **
11/29/2019 0.00
11/30/2019 0.00
12/1/2019 0.07
12/2/2019 0.43
12/3/2019 0.03
12/4/2019 0.06
12/5/2019 T
12/6/2019 0.00
12/7/2019 0.01
12/8/2019 0.00
12/9/2019 0.00
12/10/2019 0.70
12/11/2019 0.31
12/12/2019 0.00
12/13/2019 0.00
12/14/2019 0.19
12/15/2019 0.63
12/16/2019 0.16
12/17/2019 0.44
12/18/2019 0.03
12/19/2019 0.00
12/20/2019 0.00
12/21/2019 0.00
12/22/2019 0.00
12/23/2019 0.00
12/24/2019 0.00
12/25/2019 0.00
12/26/2019 0.00
12/27/2019 0.00
12/28/2019 0.00
12/29/2019 0.00
12/30/2019 0.53
12/31/2019 0.12
Day of YearDaily PrcpMultiday Prcp
1/1/2020 0.00
1/2/2020 0.00
1/3/2020 0.18
1/4/2020 0.20
1/5/2020 0.18
1/6/2020 0.00
1/7/2020 0.00
1/8/2020 0.30
1/9/2020 0.00
1/10/2020 0.00
1/11/2020 T
1/12/2020 0.28
1/13/2020 0.00
1/14/2020 0.04
1/15/2020 0.07
1/16/2020 T
1/17/2020 0.00
1/18/2020 T
1/19/2020 0.42
1/20/2020 0.00
1/21/2020 0.00
1/22/2020 0.00
1/23/2020 0.00
1/24/2020 0.00
1/25/2020 1.68
1/26/2020 0.11
1/27/2020 0.00
1/28/2020 0.00
1/29/2020 0.00
1/30/2020 0.00
1/31/2020 0.00
2/1/2020 0.01
2/2/2020 0.11
2/3/2020 0.01
2/4/2020 T
2/5/2020 0.01
2/6/2020 0.29
2/7/2020 0.65
2/8/2020 0.17
2/9/2020 0.00
2/10/2020 0.04
2/11/2020 0.46
2/12/2020 0.08
2/13/2020 0.24
2/14/2020 0.02
2/15/2020 0.00
2/16/2020 0.00
2/17/2020 0.00
2/18/2020 0.00
2/19/2020 0.01
2/20/2020 0.00
2/21/2020 0.00
2/22/2020 0.00
2/23/2020 0.00
2/24/2020 0.00
2/25/2020 0.18
2/26/2020 0.16
2/27/2020 0.87
2/28/2020 0.00
2/29/2020 T
3/1/2020 0.00
3/2/2020 0.00
3/3/2020 0.18
3/4/2020 0.08
3/5/2020 0.01
3/6/2020 0.00
3/7/2020 T
3/8/2020 0.00
3/9/2020 0.00
3/10/2020 0.01
3/11/2020 0.05
3/12/2020 0.01
3/13/2020 0.33
3/14/2020 0.01
3/15/2020 0.29
3/16/2020 0.00
3/17/2020 0.02
3/18/2020 0.00
3/19/2020 0.56
3/20/2020 0.00
3/21/2020 T
3/22/2020 0.00
3/23/2020 0.05
3/24/2020 0.16
3/25/2020 0.02
3/26/2020 0.24
3/27/2020 0.01
3/28/2020 0.35
3/29/2020 0.11
3/30/2020 T
3/31/2020 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2020 0.25
4/2/2020 0.01
4/3/2020 0.00
4/4/2020 0.00
4/5/2020 0.00
4/6/2020 0.02
4/7/2020 0.00
4/8/2020 0.14
4/9/2020 0.14
4/10/2020 0.01
4/11/2020 0.00
4/12/2020 0.00
4/13/2020 1.35
4/14/2020 0.25
4/15/2020 0.17
4/16/2020 0.00
4/17/2020 0.00
4/18/2020 0.07
4/19/2020 0.01
4/20/2020 0.00
4/21/2020 T
4/22/2020 T
4/23/2020 0.00
4/24/2020 0.78
4/25/2020 0.04
4/26/2020 0.39
4/27/2020 0.23
4/28/2020 0.00
4/29/2020 0.07
4/30/2020 0.27
5/1/2020 1.25
5/2/2020 0.00
5/3/2020 0.00
5/4/2020 0.32
5/5/2020 0.00
5/6/2020 0.25
5/7/2020 0.13
5/8/2020 0.00
5/9/2020 0.20
5/10/2020 0.00
5/11/2020 0.00
5/12/2020 0.00
5/13/2020 0.00
5/14/2020 0.00
5/15/2020 T
5/16/2020 0.00
5/17/2020 0.00
5/18/2020 0.00
5/19/2020 0.00
5/20/2020 0.00
5/21/2020 0.00
5/22/2020 0.04
5/23/2020 0.34
5/24/2020 0.00
5/25/2020 0.00
5/26/2020 T
5/27/2020 0.00
5/28/2020 0.01
5/29/2020 0.06
5/30/2020 0.08
5/31/2020 0.00
6/1/2020 0.00
6/2/2020 T
6/3/2020 0.00
6/4/2020 0.00
6/5/2020 1.00
6/6/2020 0.89
6/7/2020 0.00
6/8/2020 0.00
6/9/2020 0.00
6/10/2020 0.00
6/11/2020 0.84
6/12/2020 0.21
6/13/2020 0.00
6/14/2020 0.00
6/15/2020 0.00
6/16/2020 0.00
6/17/2020 0.00
6/18/2020 0.54
6/19/2020 0.09
6/20/2020 0.12
6/21/2020 T
6/22/2020 0.00
6/23/2020 1.10
6/24/2020 0.40
6/25/2020 0.00
6/26/2020 0.59
6/27/2020 0.00
6/28/2020 0.00
6/29/2020 0.01
6/30/2020 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2020 0.05
7/2/2020 0.00
7/3/2020 0.00
7/4/2020 0.00
7/5/2020 0.00
7/6/2020 T
7/7/2020 0.02
7/8/2020 0.00
7/9/2020 0.00
7/10/2020 0.00
7/11/2020 0.00
7/12/2020 0.00
7/13/2020 0.02
7/14/2020 T
7/15/2020 0.00
7/16/2020 0.00
7/17/2020 0.00
7/18/2020 0.00
7/19/2020 0.00
7/20/2020 M
7/21/2020 0.21
7/22/2020
7/23/2020 1.19
7/24/2020 0.90
7/25/2020 **
7/26/2020 **
7/27/2020 **
7/28/2020 **
7/29/2020 **
7/30/2020 **
7/31/2020 **
8/1/2020 0.44 0.00
8/2/2020 **
8/3/2020 **
8/4/2020 M 0.00
8/5/2020 0.54
8/6/2020 0.26
8/7/2020 1.90
8/8/2020 0.01
8/9/2020 0.00
8/10/2020 0.00
8/11/2020 0.00
8/12/2020 0.00
8/13/2020 1.71
8/14/2020 0.07
8/15/2020 0.64
8/16/2020 1.05
8/17/2020 0.02
8/18/2020 0.12
8/19/2020 0.20
8/20/2020 0.01
8/21/2020 0.00
8/22/2020 0.05
8/23/2020 0.11
8/24/2020 0.10
8/25/2020 T
8/26/2020 0.02
8/27/2020 **
8/28/2020 0.00
8/29/2020 0.93
8/30/2020 0.53
8/31/2020 0.00
9/1/2020 0.85
9/2/2020 0.25
9/3/2020
9/4/2020 0.53
9/5/2020 0.00
9/6/2020 0.00
9/7/2020 0.00
9/8/2020 0.00
9/9/2020 0.00
9/10/2020 0.58
9/11/2020 0.11
9/12/2020 0.00
9/13/2020 T
9/14/2020 0.00
9/15/2020 0.00
9/16/2020 0.00
9/17/2020 0.00
9/18/2020 0.04
9/19/2020 0.00
9/20/2020 0.00
9/21/2020 0.00
9/22/2020 0.00
9/23/2020 0.00
9/24/2020 0.00
9/25/2020 0.00
9/26/2020 0.19
9/27/2020 T
9/28/2020 **
9/29/2020 0.00 0.00
9/30/2020 0.45



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2019 7:00 AM 0.43 M M M M I don't know when the rain stopped. It was sometime by mid-morning.
10/2/2019 7:30 AM 0.00 0.0 M M M
10/3/2019 7:30 AM 0.00 0.0 M M M
10/4/2019 7:30 AM 0.00 0.0 M M M
10/5/2019 7:30 AM 0.00 0.0 M M M
10/6/2019 7:30 AM 0.00 0.0 M M M
10/7/2019 7:00 AM 0.01 M M M M I don't know what time it rained. However I was at the Dickerson Conservation Park nearby and at 1152 a very light rain occurred and it lasted till 1200.
10/8/2019 7:30 AM 0.31 M M M M Rain began sometime after 2000.
10/9/2019 7:30 AM 0.04 M M M M
10/10/2019 7:30 AM 0.01 M M M M
10/11/2019 7:30 AM 0.00 0.0 M M M
10/12/2019 7:30 AM T 0.0 M M M CORRECTED REPORT due to a note in my phone: On 10/11 at 1516 there was a very light rain for about 10 minutes.
10/13/2019 7:30 AM T M M M M Sometime late yesterday AM it rained lightly.
10/14/2019 7:30 AM 0.00 0.0 M M M Fog limited visibility to about 300 feet.
10/15/2019 7:30 AM 0.00 0.0 M M M
10/16/2019 7:30 AM 0.00 0.0 M M M
10/17/2019 7:30 AM 0.96 M M M M The rain was kind of steady the whole time. The last time we have a half inch or greater was August.
10/18/2019 7:30 AM 0.00 0.0 M M M
10/19/2019 7:30 AM 0.00 0.0 M M M The temp dropped to 33.8°F, but there was frost in the low lying fields.
10/20/2019 7:45 AM 0.16 M M M M
10/21/2019 7:30 AM 0.37 M M M M
10/22/2019 7:30 AM 0.00 0.0 M M M
10/23/2019 7:30 AM 0.41 0.0 M M M Fog at about 5' above ground with visibility at ~750-1000'. At the Potomac River there was fog covering it. NOTE: I lost my sheet with the data for this collection.
10/24/2019 7:30 AM 0.00 0.0 M M M Fog reduced visibility to about 100-150'.
10/25/2019 7:30 AM 0.00 0.0 M M M
10/26/2019 7:30 AM 0.00 0.0 M M M
10/27/2019 7:45 AM 0.63 M M M M There was very light rain between 10:53 and 1120 and then again at 1151-1205. The current rain began at 0255 and is on-going. No flooding yet but the pond is filling up.
10/28/2019 7:45 AM 0.54 M M M M It was raining when yesterday's recording was taken.
10/29/2019 7:30 AM 0.01 M M M M
10/30/2019 7:30 AM 0.00 0.0 M M M
10/31/2019 7:30 AM 0.37 M M M M Very light rain began at 1551 and continued off-and-on, then by 1716 it went to a bit harder and steady into the night.
11/1/2019 7:30 AM 1.27 M M M M The greatest wind gust was 25MPH from the NNW at 2315. This storm came from the westerly direction. Check MD-MG-120, which had greater rain. Our house, although several hundred feet from the rain gauge shielded the westerly blowing rain from the gauge on the pool fence. SKYWARN report submitted yesterday with a final today. There were some large tree branches down.
11/2/2019 7:30 AM 0.00 0.0 M M M
11/3/2019 7:30 AM 0.00 0.0 M M M
11/4/2019 7:30 AM 0.00 0.0 M M M 100% frost.
11/5/2019 7:30 AM 0.00 0.0 M M M Fog decreased visibility to about 500-750 feet.
11/6/2019 7:30 AM 0.00 0.0 M M M
11/7/2019 7:30 AM 0.00 0.0 M M M
11/8/2019 7:30 AM 0.14 M M M M
11/9/2019 7:30 AM 0.00 0.0 M M M FRost report.
11/10/2019 7:30 AM 0.00 0.0 M M M
11/11/2019 7:30 AM 0.00 0.0 M M M Frost report.
11/12/2019 7:30 AM 0.11 M M M M
11/13/2019 7:30 AM T T T M M Scattered flurries yesterday between 1400 and 1700. It melted before it even hit the ground.
11/14/2019 7:30 AM 0.00 0.0 M M M Frost report.
11/15/2019 7:30 AM 0.00 0.0 M M M Frost report.
11/16/2019 7:30 AM 0.00 0.0 M M M No frost although temp is at 24°F.
11/17/2019 7:30 AM 0.00 0.0 M M M
11/18/2019 7:00 AM 0.01 M M M M
11/19/2019 7:30 AM 0.05 M M M M
11/20/2019 7:30 AM 0.00 0.0 M M M
11/21/2019 7:30 AM 0.00 0.0 M M M
11/22/2019 7:30 AM 0.00 0.0 M M M
11/23/2019 7:30 AM 0.00 0.0 M M M Frost report.
11/24/2019 7:30 AM 0.73 M M M M Rain began very lightly about 1730, but left nothing but traces. More active rain 1955.
11/25/2019 7:30 AM 0.01 M M M M Frost report.
11/26/2019 7:15 AM 0.00 0.0 M M M Frost report.
11/27/2019 7:30 AM 0.01 M M M M
11/30/2019 7:30 AM 0.00 0.0 M M M
12/1/2019 7:45 AM 0.07 M M M M It is misting very, very lightly.
12/2/2019 7:30 AM 0.43 M M M M
12/3/2019 7:15 AM 0.03 T T T T A few flurries - barely a trace at 1309.
12/4/2019 7:00 AM 0.06 0.0 M M M Frost report.
12/5/2019 7:30 AM T T T T T The pptn was due snow flurries at 0945-1000.
12/6/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/7/2019 7:30 AM 0.01 T T T T At 1135 just as I left (about 1-2 miles from this location) I saw snow flurries. My wife confirmed that the flurries began about the same time at this location. When I got outside of Poolesville, MD, about 8 miles from this location the flurries stopped and there was a light covering of white on the ground. The 0.01" of water is what was collected this AM at 0730. Frost report.
12/8/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/9/2019 7:30 AM 0.00 0.0 M M M
12/10/2019 7:30 AM 0.70 M M M M Light to moderate rain began at 0900 and continued throughout the day at the same rate, increasing and decreasing. The temp in the AM was around ~53°F and during the day yesterday it was in the 30s and 40s. This lower temp allowed for more CO2 be absorbed in the water. With the greater temp in the AM, I noticed a lot of CO2 bubbles at the edges and the top of the gauge, as would be expected.
12/11/2019 7:30 AM 0.31 0.4 0.04 0.4 0.04
12/12/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/13/2019 7:30 AM 0.00 0.0 M M M
12/14/2019 7:30 AM 0.19 M M M M The light rain began at 1000 and ended at 1340, then began again at 2225 and ended at 0010 on 12/14/19. MD-MG-120 gauge will be out of commission due to an medical procedure until I can go to the field again. At that point I will report all the rain.
12/15/2019 7:30 AM 0.63 M M M M
12/16/2019 7:30 AM 0.16 1.1 0.16 1.1 0.16 It was not snowing at the time of collection.
12/17/2019 7:45 AM 0.44 M M M M
12/18/2019 7:30 AM 0.03 M M M M
12/19/2019 7:30 AM 0.00 0.0 M M M
12/20/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/21/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/22/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/23/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/24/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/25/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/26/2019 7:30 AM 0.00 0.0 M M M Frost report.
12/27/2019 7:15 AM 0.00 0.0 M M M
12/28/2019 7:30 AM 0.00 0.0 M M M
12/29/2019 7:30 AM 0.00 0.0 M M M
12/30/2019 7:30 AM 0.53 M M M M It is misty and somewhat foggy.
12/31/2019 7:30 AM 0.12 M M M M
1/1/2020 7:30 AM 0.00 0.0 M M M
1/2/2020 7:30 AM 0.00 0.0 M M M Frost report.
1/3/2020 7:30 AM 0.18 M M M M Rain has stopped for now.
1/4/2020 7:30 AM 0.20 M M M M
1/5/2020 7:30 AM 0.18 M M M M Cannot report when the rain stopped. This rain was off and on in the PM.
1/6/2020 7:30 AM 0.00 0.0 M M M Nothing to report. Sorry I missed this reporting on the 6th.
1/7/2020 7:30 AM 0.00 0.0 M M M Frost report.
1/8/2020 7:30 AM 0.30 2.3 0.30 2.3 0.30 Snow began at this location ~1200 and ended ~1715. On the snow board the avg depth was 2.3" and melted snow was 0.30" water. The NWS advised this location of a Snow Squal Warning at 0800 on 8 Jan. I looked across the river and saw heavy, low lying clouds-snow to the WNW and moving northward along the Potomac River. By 0820 the snow and clouds moved up the river and were no longer visible from my location. At 0804 to the WNW and NW I could not see the tree line across the river, but there was no snow at this location.
1/9/2020 7:30 AM 0.00 0.0 M M M
1/10/2020 7:30 AM 0.00 0.0 M M M
1/11/2020 7:45 AM T M M M M There was a very, very light rain for about 45 minutes.
1/12/2020 7:30 AM 0.28 M M M M Besides the rain times below, there was a mist of rain between ~0800 and ~0830.
1/13/2020 7:30 AM 0.00 0.0 M M M Dew left 0.01" water in the rain gauge.
1/14/2020 7:45 AM 0.04 M M M M It is raining at this time. There is slight flooding because the ground is already saturated and there was standing water before the rain came.
1/15/2020 7:30 AM 0.07 M M M M
1/16/2020 7:30 AM T M M M M
1/17/2020 7:30 AM 0.00 0.0 M M M
1/18/2020 7:30 AM T T T T T There was only a dusting for snow.
1/19/2020 7:30 AM 0.42 M M M M Ice particles or graupel were falling. Later rain came and coated things with ice. This continued until about 0230.
1/20/2020 7:30 AM 0.00 0.0 M M M
1/21/2020 7:30 AM 0.00 0.0 M M M
1/22/2020 7:30 AM 0.00 0.0 M M M Frost report.
1/23/2020 7:30 AM 0.00 0.0 M M M Frost report.
1/24/2020 7:30 AM 0.00 0.0 M M M
1/25/2020 7:45 AM 1.68 M M M M It is raining lightly. River Road has about 1-2 inches of water covering the entire road. SKYWARN report submitted.
1/26/2020 7:30 AM 0.11 M M M M Frost report.
1/27/2020 7:30 AM 0.00 0.0 M M M
1/28/2020 7:30 AM 0.00 0.0 M M M
1/29/2020 7:30 AM 0.00 0.0 M M M
1/30/2020 7:30 AM 0.00 0.0 M M M Frost report.
1/31/2020 7:30 AM 0.00 0.0 M M M
2/1/2020 7:30 AM 0.01 M M M M Frost report.
2/2/2020 7:30 AM 0.11 M M M M
2/3/2020 7:30 AM 0.01 M M M M Rained lightly; time unknown.
2/4/2020 7:30 AM T M M M M It is raining lightly.
2/5/2020 7:30 AM 0.01 M M M M It is misting at the collection time.
2/6/2020 7:30 AM 0.29 M M M M COMMENT ABOUT PRECIPITATION TIME: Since it was misting yesterday at collection time, 0730, below I placed 0730 as beginning of pptn. The heavier, though not much, rain began about 2045 yesterday.
2/7/2020 7:30 AM 0.65 M M M M As I walked to the rain gauge, it was raining steadily but lightly, then the sky opened up. It was drenching! The wind was very, very strong - max gust was 21 MPH ESE. The wind was changing during this period from gust of 7 MPH at 0655 S, to SW and SE, to N and W and NW. During the 5-10 minutes of a downpour there was 0.10 inches of rain. Rain came down yesterday nearly all day, although it was quite light and perhaps misting. River Road is a virtual river (again - the water comes from the fields!).
2/8/2020 7:30 AM 0.17 T T T T It snowed for 5-10 minutes at 2000 last night. We were surprised. There is a lot of standing water still.
2/9/2020 7:30 AM 0.00 0.0 M M M Frost report.
2/10/2020 7:40 AM 0.04 M M M M It was raining lightly during the collection.
2/11/2020 8:00 AM 0.46 M M M M Minor flooding is continuous from the last rain.
2/12/2020 7:30 AM 0.08 M M M M
2/13/2020 7:15 AM 0.24 M M M M It was misting when the AM measurement was taken.
2/14/2020 7:30 AM 0.02 M M M M
2/15/2020 7:30 AM 0.00 0.0 M M M Frost report.
2/16/2020 7:30 AM 0.00 0.0 M M M
2/17/2020 7:30 AM 0.00 0.0 M M M Frost report.
2/18/2020 7:30 AM 0.00 0.0 M M M
2/19/2020 7:30 AM 0.01 M M M M Only a very light rain.
2/20/2020 7:30 AM 0.00 0.0 M M M
2/21/2020 7:30 AM 0.00 0.0 M M M
2/22/2020 7:30 AM 0.00 0.0 M M M Frost report.
2/23/2020 7:30 AM 0.00 0.0 M M M Frost report.
2/24/2020 7:30 AM 0.00 0.0 M M M Frost report.
2/25/2020 7:30 AM 0.18 M M M M It was raining lightly when this measurement was taken.
2/26/2020 7:30 AM 0.16 M M M M Foggy. Visibility 1/2 mile. Not rainy now.
2/27/2020 7:30 AM 0.87 M M M M It was very windy during the night hours with lots of rain and thunder.
2/28/2020 7:30 AM 0.00 0.0 M M M
2/29/2020 7:30 AM T T T T T Scattered flurries beginning at 0935.
3/1/2020 7:30 AM 0.00 0.0 M M M
3/2/2020 7:30 AM 0.00 0.0 M M M
3/3/2020 7:30 AM 0.18 M M M M Blowing wind and light rain.
3/4/2020 7:30 AM 0.08 M M M M It was extremely windy yesterday afternoon and evening.
3/5/2020 7:30 AM 0.01 M M M M
3/6/2020 7:30 AM 0.00 0.0 M M M
3/7/2020 7:30 AM T M M M M For about 5-10 minutes at 1525 there was a light sprinkle.
3/8/2020 7:30 AM 0.00 0.0 M M M Frost report.
3/9/2020 7:30 AM 0.00 0.0 M M M
3/10/2020 7:30 AM 0.01 M M M M
3/11/2020 7:30 AM 0.05 M M M M
3/12/2020 7:30 AM 0.01 M M M M
3/13/2020 7:30 AM 0.33 M M M M
3/14/2020 7:30 AM 0.01 M M M M
3/15/2020 8:00 AM 0.29 M M M M It had rained lightly since yesterday evening. No rain now.
3/16/2020 7:30 AM 0.00 0.0 M M M Frost report.
3/17/2020 7:30 AM 0.02 M M M M
3/18/2020 7:30 AM 0.00 0.0 M M M
3/19/2020 7:30 AM 0.56 M M M M There is minor flooding on River Road and especially in the farm fields. This is due to the already present high ground water.
3/20/2020 7:30 AM 0.00 0.0 M M M
3/21/2020 7:30 AM T M M M M I am reporting a day late, but the data was taken at 0730 on 3/21. There were two periods when I was working outside that I felt rain drops from the S-SW. It was 1147-1149 and 1209-1211.
3/22/2020 7:30 AM 0.00 0.0 M M M
3/23/2020 8:00 AM 0.05 M M M M It was raining during this measurement. No record when the rain began, except that it was before or by 0700.
3/24/2020 7:30 AM 0.16 M M M M Rain was very light in the AM at collection time yesterday, and picked up at 0800. It continued off-and-on during the day.
3/25/2020 7:30 AM 0.02 M M M M It was not raining at the time of this measurement.
3/26/2020 7:30 AM 0.24 M M M M
3/27/2020 7:30 AM 0.01 M M M M
3/28/2020 7:35 AM 0.35 M M M M During the rain collection, I heard thunder and it is continuing as I write this report. It is also raining lightly. Rain had continued during the morning hours off-and-on. There is some flooding in the fields due to the high ground water that existed prior to the rain.
3/29/2020 7:30 AM 0.11 M M M M
3/30/2020 7:30 AM T M M M M I recorded a Trace for rain, but I suspect it is due to the every dew everywhere.
3/31/2020 7:30 AM 0.00 0.0 M M M
4/1/2020 7:30 AM 0.25 M M M M No flooding but there was still standing water in the fields.
4/2/2020 7:30 AM 0.01 M M M M A very light rain around 1300. Frost report.
4/3/2020 7:30 AM 0.00 0.0 M M M
4/4/2020 7:30 AM 0.00 0.0 M M M
4/5/2020 7:30 AM 0.00 0.0 M M M Fog with visibility at 0700 at just below tree level ~1500' towards the Potomac River. By 0730 the fog moved closer to house and the tree line height was no longer visible with ground level visibility ~300-500'.
4/6/2020 7:30 AM 0.02 0.0 M M M
4/7/2020 7:30 AM 0.00 0.0 M M M
4/8/2020 7:30 AM 0.14 M M M M That was one heck of a thunderstorm this AM. On the Acu-Rite Lightning Detector there were 41 strikes in 6 miles. That's a record since I got it last year. However the amount of rain was minimal. There were two periods of light rain, perhaps a trace at 1330 and 1735. The bulk of the rain and lightning activity came around 0300-0430.
4/9/2020 7:30 AM 0.14 M M M M Fog with visibility to about 1500+ feet.
4/10/2020 7:30 AM 0.01 M M M M There was a short period of light rain around 1030 and 1145. It was extremely windy with frequent gusts over 20MPH and constant gusts over 10MPH at 1 minute intervals between ~1210 and 1753. During the hours of darkness there was frequent periods of wind over 15MPH, but over 10 minute periods as opposed during the day which was every minute.
4/11/2020 7:30 AM 0.00 0.0 M M M Frost report of 0, although temp between 0450 and 0525 the temp was below freezing.
4/12/2020 7:30 AM 0.00 0.0 M M M
4/13/2020 7:45 AM 1.35 M M M M It is raining steadily and moderately during this collection. SKYWARN report submitted.
4/14/2020 7:30 AM 0.25 M M M M At 1345 there was briefly light rain, then I looked off due west toward the Potomac River and the rain was so heavy there that I could not see the trees, which were about 1/2 mile way at most. Then in one minute the heavy rain came. It stopped at 1355. There was a lot of thunder and 28 lightning strikes as recorded on the AcuRite Lightning Detector. This station recorded 0.07" less than the MD-MG-120. I am not surprised because as the rain came from the W, the house probably shielded some of the rain fall. I have seen that happen in the past.
4/15/2020 7:30 AM 0.17 M M M M There was light intermittent rain from Tuesday PM till early Wednesday AM.
4/16/2020 7:30 AM 0.00 0.0 M M M
4/17/2020 7:30 AM 0.00 0.0 M M M
4/18/2020 7:30 AM 0.07 M M M M
4/19/2020 7:30 AM 0.01 M M M M
4/20/2020 7:30 AM 0.00 0.0 M M M
4/21/2020 7:30 AM T 0.0 M M M This is a rewritten report, as I lost my note from pptn activity on 4/20. At 1146 the wind picked up, while the sky was very, very dark directly across the Potomac River, as though it was already raining there. At 1204 I left a few drops of rain. This lasted for no more than 4 or 5 minutes. The sun came out at 1220.
4/22/2020 7:30 AM T M M M M At 1145 the wind picked up a lot. At 1156 a few drops of rain came down for a few minutes, perhaps 3 or 4, from the dark cloud nearly over head. At 1215 the sun came out. Heavy wind began again at 1320 and happened throughout the afternoon.
4/23/2020 7:30 AM 0.00 0.0 M M M
4/24/2020 7:45 AM 0.78 M M M M Rain began very lightly then picked up a bit.
4/25/2020 7:30 AM 0.04 M M M M
4/26/2020 7:30 AM 0.39 M M M M IT was raining very lightly at this location, but not at MD-MG-120. (I could see rain drops on the pool here, but not in the standing water at MD-MG-120.
4/27/2020 7:30 AM 0.23 M M M M
4/28/2020 7:30 AM 0.00 0.0 M M M
4/29/2020 7:30 AM 0.07 M M M M It rained about noon then in the later afternoon to early evening. Fog visibility about 0630 was about 1000' and by ~0715 it lifted.
4/30/2020 7:30 AM 0.27 M M M M
5/1/2020 7:30 AM 1.25 M M M M Typical street flooding occurred, as with any rain about 3/4"+. SKYWARN report submitted. It rained steadily and practically all day. Rain stopped between 1700 and 2220.
5/2/2020 7:30 AM 0.00 0.0 M M M
5/3/2020 7:30 AM 0.00 0.0 M M M No rain yet, although it was predicted to occur by now.
5/4/2020 7:30 AM 0.32 M M M M Very light blowing rain @1030-1032, then `2100 to ~2140.
5/5/2020 7:30 AM 0.00 0.0 M M M
5/6/2020 7:30 AM 0.25 M M M M A very light fog westward toward the river. It was raining during this collection.
5/7/2020 7:30 AM 0.13 M M M M The majority of the rain came between 1010 and 1045 as indicated below. However at 1919 for about 20 minutes light rain occurred but it was not picked up by my digital rain gauge.
5/8/2020 7:30 AM 0.00 0.0 M M M
5/9/2020 7:30 AM 0.20 M M M M There was an initial period of light rain ~0815-0825. Then it began moderately and off-and-on between 1125 and 2130.
5/10/2020 7:30 AM 0.00 0.0 M M M
5/11/2020 7:30 AM 0.00 0.0 M M M
5/12/2020 7:30 AM 0.00 0.0 M M M
5/13/2020 7:30 AM 0.00 0.0 M M M
5/14/2020 7:30 AM 0.00 0.0 M M M
5/15/2020 7:30 AM T 0.0 M M M Two times yesterday while I was working outside, I felt a few rain drops for a couple of minutes. The times were 1041 and 1518.
5/16/2020 7:30 AM 0.00 0.0 M M M Yesterday was the highest temp we have had since last summer. It was 91.4°F.
5/17/2020 7:30 AM 0.00 0.0 M M M
5/18/2020 7:30 AM 0.00 0.0 M M M Rain was expected by this AM, but nothing transpired (yet!).
5/19/2020 7:30 AM 0.00 0.0 M M M
5/20/2020 7:30 AM 0.00 0.0 M M M
5/21/2020 7:30 AM 0.00 0.0 M M M
5/22/2020 7:30 AM 0.04 M M M M
5/23/2020 7:30 AM 0.34 M M M M
5/24/2020 7:30 AM 0.00 0.0 M M M
5/25/2020 7:30 AM 0.00 0.0 M M M
5/26/2020 7:30 AM T M M M M There were a few sprinkles due to an overhead cloud. Fog reduced visibility around 0700 to 500 feet.
5/27/2020 7:30 AM 0.00 0.0 M M M
5/28/2020 7:15 AM 0.01 M M M M No rain during collection.
5/29/2020 7:30 AM 0.06 M M M M Light rain about 0745.
5/30/2020 7:30 AM 0.08 M M M M
5/31/2020 7:30 AM 0.00 0.0 M M M
6/1/2020 7:30 AM 0.00 0.0 M M M
6/2/2020 7:30 AM T M M M M Very light and short rain during collection period.
6/3/2020 7:30 AM 0.00 0.0 M M M
6/4/2020 7:30 AM 0.00 0.0 M M M
6/5/2020 7:30 AM 1.00 M M M M Skywarn report. There were 193 lightning strikes on my Acu-Rite lightning detector.
6/6/2020 7:30 AM 0.89 M M M M We had 65 lightning strikes distances 1 to ~7+ miles. Light sprinkles began exactly at 1518. There was no collections of water, since it was so dry. The heaviest pptn was for about 5 minutes at 1610 delivering 0.15".
6/7/2020 7:30 AM 0.00 0.0 M M M
6/8/2020 7:30 AM 0.00 0.0 M M M
6/9/2020 7:30 AM 0.00 0.0 M M M
6/10/2020 7:30 AM 0.00 0.0 M M M
6/11/2020 7:30 AM 0.84 M M M M CORRECTION TO OBSERVATION NOTES AND TIME WAS ADDED. There were over 200 lightning strikes during the storm all within 1 mile of this location. Afterward, there were another 63 at a distance up to 7 miles. My Acu-Rite Lightning Detector goes to max of "200". More details on time as the data is collected later. Light rain began at 1735 for 2 minutes. Heavier and more continuous rain began at 1840.
6/12/2020 7:30 AM 0.21 0.0 M M M CORRECTION TO THE AMOUNT OF RAIN. From 0 to 0.21". Rain times were added 6/14. At 0738 there was a light rain for about 12 minutes. Then heavier rain occurred at 0808 for 5 minutes and it became moderate till 0908.
6/13/2020 7:30 AM 0.00 0.0 M M M
6/14/2020 7:30 AM 0.00 0.0 M M M
6/15/2020 7:30 AM 0.00 0.0 M M M
6/16/2020 7:30 AM 0.00 0.0 M M M
6/17/2020 7:30 AM 0.00 0.0 M M M
6/18/2020 7:30 AM 0.54 M M M M There was no heavy period of rain, just steady. The first drops were felt at 1605, then the more steady rain began at 1740.
6/19/2020 7:30 AM 0.09 M M M M There were a few drops at 1448 from dark clouds overhead leaving 0.03". No record (yet) as to when the rest of the rain came this AM. Once data is recovered, I shall amend this report.
6/20/2020 7:30 AM 0.12 M M M M It rained off and on between 1038 and 1545.
6/21/2020 7:30 AM T M M M M
6/22/2020 7:30 AM 0.00 0.0 M M M
6/23/2020 7:30 AM 1.10 M M M M SKYWARN report submitted. I was in Poolesville, MD at 1452, when a few drops fell for no greater than 5 minutes. As I left town going W on MD#107 I noticed that on the road there was evidence of a lot of rain coming down a few minutes earlier. When I was five miles from this location, there was no more sign of any pptn. At this location, the rain came quickly and swiftly at 1536. In checking the Acu-Rite Lightning detector and there were 198 strikes in one mile. At 1612, the rain subsided and I still heard thunder. At 1823 there were 58 lightning strikes at 1 mile and very, very heavy rain came with very heavy wind. The wind tore the solar cover off of the pool and knocked down one, twelve inch diameter tree by the pond. The wind tore the solar cover off of the pool and knocked down one, twelve inch diameter tree by the pond. At 1825 the rain was coming down so thickly, I could not see the fence lines due W and due E from my house. There was a total over over 578 lightning strikes in one to 13 miles. Most occurred in one mile
6/24/2020 7:30 AM 0.40 M M M M Although my digital rain gauge indicated that rain began at 2220, it may have started lightly before that because the rain gauge only reported 0.23". It was a windy storm with lightning. There were 98 lightning strikes within 1 mile of this location.
6/25/2020 7:30 AM 0.00 0.0 M M M
6/26/2020 7:30 AM 0.59 M M M M This is late a late report, but rain record was taken at 0730. A few drops occurred at 1336-1343. The big and heavy rain occurred at 1741-1802, then it stopped and the sun came out. It was all very strange. During the heavy rain there were 78 lightning strikes within 1 mile. Total strikes including after it stopped raining were 93. During the heavy rain at 1741, it was coming down so heavily that I was not able to see the trees about 1000 feet due W along the C&O Canal.
6/27/2020 7:30 AM 0.00 0.0 M M M 1 lightning strike over night at 19 miles.
6/28/2020 7:30 AM 0.00 0.0 M M M
6/29/2020 7:30 AM 0.01 M M M M Light rain in the AM.
6/30/2020 7:30 AM 0.00 0.0 M M M
7/1/2020 7:30 AM 0.05 M M M M
7/2/2020 7:30 AM 0.00 0.0 M M M There were 4 lightning strikes in the previous 24 hour period with the last one(s) 15 miles away.
7/3/2020 7:30 AM 0.00 0.0 M M M
7/4/2020 7:30 AM 0.00 0.0 M M M
7/5/2020 7:30 AM 0.00 0.0 M M M
7/6/2020 7:30 AM T M M M M First blowing rain from SE-SW with lots of thunder about 1600. Then at 1843 for 2 minutes, light rain.
7/7/2020 7:30 AM 0.02 M M M M Thuderstorm during the night across the Potomac River. Some thunder in the late afternoon and early evening.
7/8/2020 7:30 AM 0.00 0.0 M M M
7/9/2020 7:30 AM 0.00 0.0 M M M There was a thunderstorm nearby but there was no pptn at this location. Acu-Rite Lightning detector: 29 strikes, 12 miles.
7/10/2020 7:30 AM 0.00 0.0 M M M
7/11/2020 7:30 AM 0.00 0.0 M M M One lightning strike in 15 miles in past 24 hours.
7/12/2020 7:30 AM 0.00 0.0 M M M
7/13/2020 7:30 AM 0.02 M M M M 1619-1624: Light rain; 1815-1835: medium intensity rain.
7/14/2020 7:30 AM T 0.0 M M M A few sprinkles during the afternoon.
7/15/2020 7:30 AM 0.00 0.0 M M M
7/16/2020 7:30 AM 0.00 0.0 M M M
7/17/2020 7:30 AM 0.00 0.0 M M M
7/18/2020 7:30 AM 0.00 0.0 M M M
7/19/2020 7:30 AM 0.00 0.0 M M M
7/20/2020 7:30 AM M 0.0 M M M Added info on 8/9 although collected on 7/20 for 7/19-20. Heavy rain at 1640. Heard thunder all over. Rain lasted till about 1755.
7/21/2020 7:30 AM 0.21 M M M M This additional info was added on 8/9 for 7/21 from notes for the period. Rain between 1557 and 1755.
7/23/2020 7:30 AM 1.19 M M M M SKYWARN report. At 1437 There was rain and thunder across the Potomac River. At 1456 very heavy rain hit Poolesville, MD, where I was at that time. As I drove home I noticed a lot of evidence of rain on the road and at this location. NFI. At 1846 I had light rain and heard some thunder.
7/24/2020 7:30 AM 0.90 M M M M It was still raining at collection time off and on.
8/1/2020 7:30 AM 0.44 M M M M
8/4/2020 7:30 AM M M M M M
8/5/2020 7:30 AM 0.54 M M M M
8/6/2020 7:30 AM 0.26 M M M M
8/7/2020 7:30 AM 1.90 M M M M Heavy fog with visibility to ~500' SKYWARN report issued. 40 lightning strikes.
8/8/2020 7:30 AM 0.01 M M M M
8/9/2020 7:30 AM 0.00 0.0 M M M
8/10/2020 7:30 AM 0.00 0.0 M M M Fog created limited visibility at ~500'.
8/11/2020 7:30 AM 0.00 0.0 M M M
8/12/2020 7:30 AM 0.00 0.0 M M M
8/13/2020 7:15 AM 1.71 0.0 M M M SKYWARN REPORT SUBMITTED. Last night's rain was intense and fierce from the east and not the west which is typical for this area. Rain in both gauges were the same within 0.01". It began @1825 with medium rain and thunder&lightning. There were well over 440 lightning strikes. Most of the rain fell within 30 minutes. Lastly it was raining lightly during this reading.
8/14/2020 7:30 AM 0.07 M M M M This data was collected on the day as indicated but reported today, 8/15/20, and is accurate. I am having difficulty with reporting due to family medical issues. There were 8 lightning strikes.
8/15/2020 7:00 AM 0.64 M M M M There was one lightning strike at 19 miles.
8/16/2020 8:00 AM 1.05 M M M M SKYWARN REPORT submitted. Rain began at 1028 and it rained nearly all day. More rain began about 1805. There were two lightning strikes recorded, both about 15 miles from this location.
8/17/2020 7:30 AM 0.02 M M M M My initial report for this date was in error.
8/18/2020 8:00 AM 0.12 M M M M At 1643 there was heavy rain at this location. The sun to the west was shining and there must have been a rainbow as someone east of this location saw it around our location.
8/19/2020 7:46 AM 0.20 M M M M It is still raining lightly. The next reading, for MD-MG-120, at 0749, the rain had stopped.
8/20/2020 7:30 AM 0.01 M M M M
8/21/2020 7:30 AM 0.00 0.0 M M M
8/22/2020 7:30 AM 0.05 M M M M Fog reduced visibiity to ~300'
8/23/2020 7:30 AM 0.11 M M M M Fog in AM; reduced visibility to ~800'.
8/24/2020 6:45 AM 0.10 M M M M Rain started lightly then at 1838 it came down heavily for a few minutes. There were 17 lightning strikes.
8/25/2020 7:00 AM T M M M M There were 18 lightning strikes.
8/26/2020 7:30 AM 0.02 M M M M There were 62 lightning strikes. When it rained it was intense for less than one minute then nothing. Elsewhere in the late afternoon while I was in Germantown, MD and Poolesville, MD there was intense rain with large drops.
8/29/2020 7:30 AM 0.93 M M M M At 1100 for a few minutes there was a very, very light rain. Then at 1649 the heavier rain began and tapered off to medium intensity.
8/30/2020 7:30 AM 0.53 M M M M
8/31/2020 7:30 AM 0.00 0.0 M M M Just before 0730, there was one lightning strike about 21 miles away.
9/1/2020 7:30 AM 0.85 M M M M
9/2/2020 7:30 AM 0.25 M M M M Although this report is late, the data collected was on the date and time as recorded. I've had caretaking duties with my wife. There were two periods of rain: 2140-0020 and 0415 to 0505, with the latter leaving 0.09".
9/4/2020 7:45 AM 0.53 M M M M The first period of rain was from 1550 to 1630 and the second was from 2015 to 2035, leaving 0.03" this last time. During the first period storm the max wind gust was 23MPH. There was 173 lightning strikes in 12 miles.
9/5/2020 7:30 AM 0.00 0.0 M M M No rain although there was evidence of it around us.
9/6/2020 7:30 AM 0.00 0.0 M M M One lightning strike in 3 miles.
9/7/2020 7:30 AM 0.00 0.0 M M M
9/8/2020 7:30 AM 0.00 0.0 M M M
9/9/2020 7:30 AM 0.00 0.0 M M M
9/10/2020 7:30 AM 0.58 M M M M The data was collected at 0730 on Sep 10th, despite being reported today. A few drops of rain began at 1409.
9/11/2020 7:30 AM 0.11 M M M M The data was collected at 0730 on Sep 10th, despite being reported today.
9/12/2020 7:30 AM 0.00 0.0 M M M
9/13/2020 7:30 AM T 0.0 M M M There was some very light rain 0920-0930.
9/14/2020 7:30 AM 0.00 0.0 M M M
9/15/2020 7:30 AM 0.00 0.0 M M M
9/16/2020 7:30 AM 0.00 0.0 M M M
9/17/2020 7:30 AM 0.00 0.0 M M M Fog reduced visibility to 200-250'.
9/18/2020 7:30 AM 0.04 M M M M Data collection was taken at time represented here.
9/19/2020 7:30 AM 0.00 0.0 M M M
9/20/2020 7:30 AM 0.00 0.0 M M M There were two lightning strikes recorded over night.
9/21/2020 7:30 AM 0.00 0.0 M M M
9/22/2020 6:40 AM 0.00 0.0 M M M Fog is limiting visibility to 100-150'.
9/23/2020 7:30 AM 0.00 0.0 M M M
9/24/2020 7:30 AM 0.00 0.0 M M M
9/25/2020 7:30 AM 0.00 0.0 M M M Fog limiting visibility to 300-350'.
9/26/2020 7:30 AM 0.19 M M M M
9/27/2020 7:30 AM T M M M M
9/29/2020 7:30 AM 0.00 0.0 M M M Although the reporting is late, the data was taken at 0730 yesterday.
9/30/2020 7:30 AM 0.45 M M M M Brief very light rain 1216, then more, but still light rain blowing from the W, across the Potomac River, began at 1430.



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
11/28/2019 11/29/2019 7:30 AM 2 0.00 M M
7/25/2020 8/01/2020 7:30 AM 8 0.00 M M
8/2/2020 8/04/2020 7:30 AM 3 0.00 M M
8/27/2020 8/28/2020 7:30 AM 2 0.00 M M
9/28/2020 9/29/2020 7:30 AM 2 0.00 M M



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