Station Overview Station Location
Station Number VA-FX-51 Latitude 38.903
Station Name Vienna 1.3 W Longitude -77.2836
County Fairfax Elevation (ft) 371



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 3.55 5.74 30 5.74 30 0.00 0 0 15 1 0.0 0 0
Nov 11 3.35 2.25 30 2.25 30 0.00 0 0 10 1 0.0 0 0
Dec 11 3.17 4.37 31 4.37 31 0.00 0 0 9 1 0.0 0 0
Jan 12 2.94 2.71 31 2.71 31 0.00 0 0 11 5 1.2 1 3
Feb 12 2.74 1.25 28 1.25 28 0.00 0 0 11 5 0.2 1 0
March 12 3.67 2.81 30 2.81 30 0.00 0 0 11 5 0.0 0 0
April 12 3.34 2.36 29 2.17 25 0.19 4 1 5 5 0.0 0 0
May 12 4.24 5.09 31 5.09 28 0.00 3 1 16 1 0.0 0 0
June 12 3.98 3.75 30 3.75 30 0.00 0 0 9 1 0.0 0 0
July 12 4.03 3.60 30 3.60 30 0.00 0 0 12 5 0.0 0 0
Aug 12 3.36 2.80 31 1.63 24 1.17 7 1 11 2 0.0 0 0
Sept 12 4.00 2.81 29 2.81 29 0.00 0 0 11 3 0.0 0 0
Water Year Totals: 42.37" 39.54" 360 days 38.18" 346 1.36" 14 days 3 131 days 35 days 1.4" 2 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
10/1/2011 0.03
10/2/2011 0.67
10/3/2011 0.09
10/4/2011 0.04
10/5/2011 T
10/6/2011 0.00
10/7/2011 0.00
10/8/2011 0.00
10/9/2011 0.00
10/10/2011 0.00
10/11/2011 0.00
10/12/2011 0.05
10/13/2011 1.02
10/14/2011 1.08
10/15/2011 0.27
10/16/2011 0.00
10/17/2011 0.00
10/18/2011 0.00
10/19/2011 0.53
10/20/2011 0.27
10/21/2011 0.00
10/22/2011 0.00
10/23/2011 0.00
10/24/2011 0.00
10/25/2011 0.14
10/26/2011
10/27/2011 0.20
10/28/2011 0.18
10/29/2011 0.62
10/30/2011 0.55
10/31/2011 0.00
11/1/2011 0.01
11/2/2011 0.00
11/3/2011 0.00
11/4/2011 0.00
11/5/2011 0.00
11/6/2011 0.00
11/7/2011 0.00
11/8/2011 0.00
11/9/2011 0.00
11/10/2011 0.00
11/11/2011 0.12
11/12/2011 0.00
11/13/2011 0.00
11/14/2011 0.00
11/15/2011 0.00
11/16/2011 0.15
11/17/2011 0.26
11/18/2011 T
11/19/2011 0.00
11/20/2011 0.00
11/21/2011 0.08
11/22/2011 0.28
11/23/2011 0.77
11/24/2011 0.04
11/25/2011 0.00
11/26/2011 0.00
11/27/2011 0.00
11/28/2011 0.00
11/29/2011 0.01
11/30/2011 0.53
12/1/2011 0.00
12/2/2011 0.00
12/3/2011 0.00
12/4/2011 0.00
12/5/2011 0.00
12/6/2011 0.02
12/7/2011 1.01
12/8/2011 1.67
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 0.03
12/17/2011 0.00
12/18/2011 0.00
12/19/2011 0.00
12/20/2011 0.00
12/21/2011 0.00
12/22/2011 0.10
12/23/2011 0.97
12/24/2011 0.01
12/25/2011 0.00
12/26/2011 0.00
12/27/2011 0.00
12/28/2011 0.55
12/29/2011 0.00
12/30/2011 T
12/31/2011 0.01
Day of YearDaily PrcpMultiday Prcp
1/1/2012 0.00
1/2/2012 0.07
1/3/2012 T
1/4/2012 T
1/5/2012 0.00
1/6/2012 0.00
1/7/2012 0.00
1/8/2012 0.00
1/9/2012 0.00
1/10/2012 0.12
1/11/2012 0.00
1/12/2012 1.18
1/13/2012 0.11
1/14/2012 0.00
1/15/2012 0.00
1/16/2012 0.00
1/17/2012 0.09
1/18/2012 0.14
1/19/2012 0.00
1/20/2012 T
1/21/2012 0.32
1/22/2012 0.00
1/23/2012 T
1/24/2012 0.07
1/25/2012 0.00
1/26/2012 0.01
1/27/2012 0.32
1/28/2012 0.28
1/29/2012 0.00
1/30/2012 T
1/31/2012 0.00
2/1/2012 0.01
2/2/2012 0.08
2/3/2012 0.03
2/4/2012 0.00
2/5/2012 0.12
2/6/2012 T
2/7/2012 0.00
2/8/2012 0.00
2/9/2012 0.13
2/10/2012
2/11/2012 0.15
2/12/2012 0.02
2/13/2012 0.00
2/14/2012 0.00
2/15/2012 T
2/16/2012 0.00
2/17/2012 0.18
2/18/2012 0.00
2/19/2012 0.00
2/20/2012 T
2/21/2012 0.00
2/22/2012 0.00
2/23/2012 0.01
2/24/2012 T
2/25/2012 0.51
2/26/2012 0.01
2/27/2012 0.00
2/28/2012 0.00
2/29/2012 T
3/1/2012 1.40
3/2/2012 0.00
3/3/2012 0.78
3/4/2012 0.01
3/5/2012 0.00
3/6/2012 T
3/7/2012 0.00
3/8/2012 0.00
3/9/2012 0.01
3/10/2012 0.00
3/11/2012 0.00
3/12/2012 0.00
3/13/2012 0.01
3/14/2012 0.00
3/15/2012 0.00
3/16/2012 0.00
3/17/2012 0.03
3/18/2012 T
3/19/2012 T
3/20/2012 0.02
3/21/2012 T
3/22/2012 T
3/23/2012 0.00
3/24/2012 0.00
3/25/2012 0.50
3/26/2012 0.02
3/27/2012 0.00
3/28/2012 0.00
3/29/2012 0.02
3/30/2012
3/31/2012 0.01
Day of YearDaily PrcpMultiday Prcp
4/1/2012 0.00
4/2/2012 **
4/3/2012 **
4/4/2012 **
4/5/2012 0.19
4/6/2012
4/7/2012 0.00
4/8/2012 0.00
4/9/2012 0.00
4/10/2012 T
4/11/2012 0.00
4/12/2012 T
4/13/2012 0.00
4/14/2012 0.00
4/15/2012 0.00
4/16/2012 0.00
4/17/2012 0.00
4/18/2012 0.00
4/19/2012 0.28
4/20/2012 0.00
4/21/2012 0.00
4/22/2012 0.29
4/23/2012 1.20
4/24/2012 0.17
4/25/2012 0.00
4/26/2012 T
4/27/2012 T
4/28/2012 0.00
4/29/2012 0.23
4/30/2012 T
5/1/2012 0.14
5/2/2012 0.02
5/3/2012 0.01
5/4/2012 0.00
5/5/2012 0.52
5/6/2012 T
5/7/2012 0.00
5/8/2012 0.00
5/9/2012 0.13
5/10/2012 0.35
5/11/2012 0.00
5/12/2012 0.00
5/13/2012 0.00
5/14/2012 0.09
5/15/2012 0.98
5/16/2012 0.04
5/17/2012 0.00
5/18/2012 **
5/19/2012 **
5/20/2012 0.00
5/21/2012 0.26
5/22/2012 0.26
5/23/2012 0.32
5/24/2012 0.83
5/25/2012 0.05
5/26/2012 0.00
5/27/2012 0.00
5/28/2012 0.29
5/29/2012 0.00
5/30/2012 0.80
5/31/2012 0.00
6/1/2012 0.01
6/2/2012 2.37
6/3/2012 0.00
6/4/2012 T
6/5/2012 0.00
6/6/2012 0.00
6/7/2012 0.00
6/8/2012 0.00
6/9/2012 0.00
6/10/2012 0.00
6/11/2012 0.00
6/12/2012 0.06
6/13/2012 0.31
6/14/2012 0.00
6/15/2012 0.00
6/16/2012 0.00
6/17/2012 0.00
6/18/2012 0.32
6/19/2012 0.06
6/20/2012 0.00
6/21/2012 0.00
6/22/2012 0.00
6/23/2012 0.05
6/24/2012 0.00
6/25/2012 0.00
6/26/2012 0.01
6/27/2012 0.00
6/28/2012 0.00
6/29/2012 0.00
6/30/2012 0.56
Day of YearDaily PrcpMultiday Prcp
7/1/2012 T
7/2/2012 0.00
7/3/2012 0.00
7/4/2012 0.34
7/5/2012 0.00
7/6/2012 0.00
7/7/2012 0.00
7/8/2012 0.00
7/9/2012 0.46
7/10/2012 0.01
7/11/2012 1.39
7/12/2012 0.00
7/13/2012 0.01
7/14/2012 0.06
7/15/2012 0.01
7/16/2012 0.05
7/17/2012 T
7/18/2012 0.00
7/19/2012 0.00
7/20/2012 0.64
7/21/2012 0.39
7/22/2012 0.22
7/23/2012 0.02
7/24/2012 T
7/25/2012 T
7/26/2012 0.00
7/27/2012 0.00
7/28/2012 0.00
7/29/2012 T
7/30/2012 0.00
7/31/2012
8/1/2012 0.04
8/2/2012 0.03
8/3/2012 0.00
8/4/2012 0.00
8/5/2012 0.00
8/6/2012 0.03
8/7/2012 0.01
8/8/2012 0.00
8/9/2012 0.29
8/10/2012 **
8/11/2012 **
8/12/2012 **
8/13/2012 **
8/14/2012 **
8/15/2012 **
8/16/2012 1.17
8/17/2012 0.00
8/18/2012 0.43
8/19/2012 0.00
8/20/2012 0.14
8/21/2012 0.09
8/22/2012 T
8/23/2012 0.00
8/24/2012 0.00
8/25/2012 0.00
8/26/2012 0.17
8/27/2012 0.37
8/28/2012 0.03
8/29/2012 T
8/30/2012 0.00
8/31/2012 0.00
9/1/2012 T
9/2/2012 0.08
9/3/2012 0.22
9/4/2012 0.02
9/5/2012 0.00
9/6/2012 0.00
9/7/2012 0.08
9/8/2012 T
9/9/2012 0.77
9/10/2012 0.00
9/11/2012 0.00
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
9/18/2012 0.19
9/19/2012 0.74
9/20/2012 0.00
9/21/2012 0.00
9/22/2012 0.00
9/23/2012 T
9/24/2012 0.00
9/25/2012 0.00
9/26/2012 0.01
9/27/2012 0.03
9/28/2012 0.66
9/29/2012 0.01
9/30/2012 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2011 8:30 AM 0.03 M M M M raining at time of measurement
10/2/2011 8:30 AM 0.67 M M M M light rain through most of the day, yesterday
10/3/2011 7:15 AM 0.09 M M M M
10/4/2011 7:00 AM 0.04 M M M M
10/5/2011 7:30 AM T M M M M
10/6/2011 8:00 AM 0.00 0.0 M M M
10/7/2011 8:00 AM 0.00 0.0 M M M
10/8/2011 8:00 AM 0.00 0.0 M M M
10/9/2011 8:00 AM 0.00 0.0 M M M
10/10/2011 8:00 AM 0.00 0.0 M M M
10/11/2011 7:45 AM 0.00 0.0 M M M
10/12/2011 8:00 AM 0.05 M M M M
10/13/2011 8:00 AM 1.02 M M M M Occasional showers through the last 24 hours, a few rumbles of thunder
10/14/2011 7:10 AM 1.08 M M M M Very heavy rain and some wind, from about 5:45 - 6:15 pm yesterday. Tornado warning for just a few miles west of me. Many thunderstorms in the evening. Lost power from 6 - 11 p.m.
10/15/2011 8:30 AM 0.27 M M M M
10/16/2011 8:00 AM 0.00 0.0 M M M
10/17/2011 8:00 AM 0.00 0.0 M M M
10/18/2011 8:00 AM 0.00 0.0 M M M
10/19/2011 8:00 AM 0.53 M M M M
10/20/2011 7:15 AM 0.27 M M M M
10/21/2011 8:00 AM 0.00 0.0 M M M
10/22/2011 8:00 AM 0.00 0.0 M M M
10/23/2011 8:00 AM 0.00 0.0 M M M
10/24/2011 8:00 AM 0.00 0.0 M M M
10/25/2011 7:00 AM 0.14 M M M M
10/27/2011 7:10 AM 0.20 M M M M
10/28/2011 7:15 AM 0.18 M M M M
10/29/2011 9:20 AM 0.62 M M M M Temperature just above freezing, no snow this time
10/30/2011 9:00 AM 0.55 T M T M The first winter storm here began as rain in the mid-morning. Temperature dropped in the afternoon, and it changed over to snow around 3 PM, till it ended around 6 PM. Most melted immediately on the ground. A little left this morning in the shadiest spots.
10/31/2011 7:20 AM 0.00 0.0 M M M
11/1/2011 7:00 AM 0.01 M M M M
11/2/2011 8:00 AM 0.00 0.0 M M M
11/3/2011 8:00 AM 0.00 0.0 M M M
11/4/2011 8:00 AM 0.00 0.0 M M M
11/5/2011 8:00 AM 0.00 0.0 M M M
11/6/2011 8:00 AM 0.00 0.0 M M M
11/7/2011 8:00 AM 0.00 0.0 M M M
11/8/2011 7:45 AM 0.00 0.0 M M M
11/9/2011 8:00 AM 0.00 0.0 M M M
11/10/2011 8:00 AM 0.00 0.0 M M M
11/11/2011 6:45 AM 0.12 M M M M
11/12/2011 8:00 AM 0.00 0.0 M M M
11/13/2011 8:00 AM 0.00 0.0 M M M
11/14/2011 7:15 AM 0.00 0.0 M M M
11/15/2011 7:15 AM 0.00 0.0 M M M
11/16/2011 7:15 AM 0.15 M M M M
11/17/2011 8:00 AM 0.26 M M M M
11/18/2011 8:00 AM T M M M M A few sprinkles, yesterday morning
11/19/2011 8:00 AM 0.00 0.0 M M M
11/20/2011 8:00 AM 0.00 0.0 M M M
11/21/2011 7:15 AM 0.08 M M M M
11/22/2011 8:30 AM 0.28 M M M M light to moderate rain, during most of the previous 24 hours
11/23/2011 7:15 AM 0.77 M M M M
11/24/2011 8:00 AM 0.04 M M M M
11/25/2011 8:00 AM 0.00 0.0 M M M
11/26/2011 8:00 AM 0.00 0.0 M M M
11/27/2011 8:00 AM 0.00 0.0 M M M
11/28/2011 8:00 AM 0.00 0.0 M M M
11/29/2011 7:15 AM 0.01 M M M M
11/30/2011 7:00 AM 0.53 M M M M
12/1/2011 8:00 AM 0.00 0.0 M M M
12/2/2011 8:00 AM 0.00 0.0 M M M
12/3/2011 8:00 AM 0.00 0.0 M M M
12/4/2011 8:00 AM 0.00 0.0 M M M
12/5/2011 8:00 AM 0.00 0.0 M M M
12/6/2011 8:00 AM 0.02 M M M M
12/7/2011 8:00 AM 1.01 M M M M
12/8/2011 7:15 AM 1.67 M M M M Steady moderate rain through most of yesterday
12/9/2011 8:00 AM 0.00 0.0 M M M
12/10/2011 8:00 AM 0.00 0.0 M M M
12/11/2011 8:00 AM 0.00 0.0 M M M
12/12/2011 8:00 AM 0.00 0.0 M M M
12/13/2011 7:15 AM 0.00 0.0 M M M
12/14/2011 8:00 AM 0.00 0.0 M M M
12/15/2011 8:00 AM 0.00 0.0 M M M
12/16/2011 8:30 AM 0.03 M M M M A little light rain yesterday afternoon
12/17/2011 8:00 AM 0.00 0.0 M M M
12/18/2011 8:00 AM 0.00 0.0 M M M
12/19/2011 7:45 AM 0.00 0.0 M M M
12/20/2011 8:00 AM 0.00 0.0 M M M
12/21/2011 7:00 AM 0.00 0.0 M M M
12/22/2011 8:00 AM 0.10 M M M M light rain through much of the daylit hours yesterday
12/23/2011 8:00 AM 0.97 M M M M moderate to heavy rain during the night
12/24/2011 9:00 AM 0.01 M M M M
12/25/2011 8:00 AM 0.00 0.0 M M M
12/26/2011 8:00 AM 0.00 0.0 M M M
12/27/2011 8:00 AM 0.00 0.0 M M M
12/28/2011 8:00 AM 0.55 M M M M Moderate rain through most of the daylight hours yesterday.
12/29/2011 8:00 AM 0.00 0.0 M M M
12/30/2011 8:00 AM T T M T M A little snow yesterday mid-afternoon, melted immediately
12/31/2011 8:00 AM 0.01 M M M M
1/1/2012 8:00 AM 0.00 0.0 M M M
1/2/2012 8:00 AM 0.07 M M M M A mid-afternoon shower yesterday.
1/3/2012 8:00 AM T T T 0.0 M very light flurries yesterday afternoon
1/4/2012 8:00 AM T 0.0 M M M Another day of very light snow "showers". Temperature this morning at 7 AM was 10 degrees F.
1/5/2012 8:00 AM 0.00 0.0 M M M
1/6/2012 8:00 AM 0.00 0.0 M M M
1/7/2012 8:00 AM 0.00 0.0 M M M
1/8/2012 8:00 AM 0.00 0.0 M M M
1/9/2012 8:00 AM 0.00 0.0 M M M
1/10/2012 8:00 AM 0.12 T 0.12 T M A surprise snow yesterday afternoon (not in the predictions), a few hours of big fat flakes. Mostly melted on contact with roads and sidewalks. Some left on open grassy areas at time of report.
1/11/2012 8:00 AM 0.00 0.0 M M M
1/12/2012 8:00 AM 1.18 M M M M steady rain from about noon till midnight
1/13/2012 7:15 AM 0.11 M M M M
1/14/2012 8:00 AM 0.00 0.0 M M M
1/15/2012 8:00 AM 0.00 0.0 M M M
1/16/2012 8:00 AM 0.00 0.0 M M M
1/17/2012 7:25 AM 0.09 M M M M periodic light rain overnight, another batch of rain starting at time of reading
1/18/2012 8:00 AM 0.14 M M M M light to moderate rain, yesterday morning
1/19/2012 7:15 AM 0.00 0.0 M M M
1/20/2012 8:00 AM T M M M M
1/21/2012 9:00 AM 0.32 1.2 M 1.2 M Snow began before 10 PM. A glaze of ice this morning on top. About 0.1" of ice on twigs at time of reading.
1/22/2012 8:00 AM 0.00 0.0 M 1.0 M Icy snow largely unmelted from yesterday.
1/23/2012 7:30 AM T M M 0.9 M A few snowflakes yesterday morning, followed by mist/drizzle through most of the rest of the day and evening. Fog at time of report.
1/24/2012 7:30 AM 0.07 M M M M rain and drizzle nearly all day yesterday, fog at time of report. just a few small piles of shoveled snow remain.
1/25/2012 8:00 AM 0.00 0.0 M M M
1/26/2012 8:00 AM 0.01 M M M M brief pre-dawn shower
1/27/2012 7:25 AM 0.32 M M M M rain overnight, and a heavy downpour just before time of reading
1/28/2012 8:00 AM 0.28 M M M M rain with a bit of thunder, yesterday mid-morning
1/29/2012 8:00 AM 0.00 0.0 M M M
1/30/2012 8:00 AM T M M M M A few snowflakes last night
1/31/2012 8:00 AM 0.00 0.0 M M M
2/1/2012 7:10 AM 0.01 M M M M light rain before sunrise
2/2/2012 7:30 AM 0.08 M M M M
2/3/2012 7:15 AM 0.03 M M M M
2/4/2012 8:00 AM 0.00 0.0 M M M
2/5/2012 8:30 AM 0.12 M M M M
2/6/2012 8:00 AM T M M M M
2/7/2012 8:00 AM 0.00 0.0 M M M
2/8/2012 8:00 AM 0.00 0.0 M M M
2/9/2012 8:00 AM 0.13 M M M M Wet snow late afternoon and evening, mostly melted immediately.
2/11/2012 7:30 AM 0.15 0.2 M M M
2/12/2012 9:00 AM 0.02 T M M M A few light snow flurries accompanied a very strong cold front yesterday. Snow blew sideways by very high winds overnight.
2/13/2012 8:00 AM 0.00 0.0 M M M A little snow left in shady spots
2/14/2012 7:25 AM 0.00 0.0 M M M A little snow remains in shady spots
2/15/2012 7:15 AM T M M M M A couple of passing light showers yesterday
2/16/2012 7:25 AM 0.00 0.0 M M M
2/17/2012 8:00 AM 0.18 M M M M light rain through much of the day yesterday
2/18/2012 8:00 AM 0.00 0.0 M M M
2/19/2012 8:00 AM 0.00 0.0 M M M
2/20/2012 8:00 AM T 0.0 M M M Missed out on the storm that passed just to our south.
2/21/2012 7:15 AM 0.00 0.0 M M M
2/22/2012 8:00 AM 0.00 0.0 M M M
2/23/2012 7:15 AM 0.01 M M M M light rain in the middle of the night
2/24/2012 8:30 AM T M M M M
2/25/2012 7:15 AM 0.51 M M M M Most fell between 1:30 and 2:30 p.m., quite heavy downpour to start
2/26/2012 9:00 AM 0.01 M M M M includes a brief snow flurry yesterday morning
2/27/2012 7:15 AM 0.00 0.0 M M M
2/28/2012 8:00 AM 0.00 0.0 M M M
2/29/2012 7:15 AM T M M M M Just starting to rain
3/1/2012 7:30 AM 1.40 M M M M Heavy rain in the late morning, intermittent showers the rest of the day
3/2/2012 8:00 AM 0.00 0.0 M M M
3/3/2012 8:00 AM 0.78 M M M M Rain started mid-afternoon. Some heavy downpours particularly in late evening, some thunder around 11 PM
3/4/2012 8:00 AM 0.01 M M M M
3/5/2012 8:00 AM 0.00 0.0 M M M
3/6/2012 8:00 AM T M M M M A few snowflakes yesterday mid-morning
3/7/2012 8:00 AM 0.00 0.0 M M M
3/8/2012 7:15 AM 0.00 0.0 M M M
3/9/2012 8:00 AM 0.01 M M M M light rain after midnight
3/10/2012 8:00 AM 0.00 0.0 M M M
3/11/2012 8:00 AM 0.00 0.0 M M M
3/12/2012 7:20 AM 0.00 0.0 M M M
3/13/2012 8:00 AM 0.01 M M M M
3/14/2012 8:00 AM 0.00 0.0 M M M
3/15/2012 8:00 AM 0.00 0.0 M M M
3/16/2012 8:00 AM 0.00 0.0 M M M
3/17/2012 7:25 AM 0.03 M M M M
3/18/2012 8:00 AM T M M M M misting at time of reading
3/19/2012 8:00 AM T M M M M
3/20/2012 8:00 AM 0.02 M M M M
3/21/2012 8:00 AM T M M M M
3/22/2012 8:00 AM T M M M M Another foggy morning
3/23/2012 8:00 AM 0.00 0.0 M M M
3/24/2012 8:00 AM 0.00 0.0 M M M
3/25/2012 9:00 AM 0.50 M M M M
3/26/2012 8:00 AM 0.02 M M M M
3/27/2012 7:30 AM 0.00 0.0 M M M
3/28/2012 8:00 AM 0.00 0.0 M M M
3/29/2012 9:00 AM 0.02 M M M M Mid-afternoon line of "storms" went through, a little thunder but not much to it here
3/31/2012 8:00 AM 0.01 M M M M
4/1/2012 8:00 AM 0.00 0.0 M M M
4/7/2012 8:00 AM 0.00 0.0 M M M
4/8/2012 8:00 AM 0.00 0.0 M M M
4/9/2012 8:00 AM 0.00 0.0 M M M
4/10/2012 8:00 AM T M M M M
4/11/2012 8:00 AM 0.00 0.0 M M M
4/12/2012 8:00 AM T M M M M
4/13/2012 8:00 AM 0.00 0.0 M M M
4/14/2012 7:45 AM 0.00 0.0 M M M
4/15/2012 8:00 AM 0.00 0.0 M M M
4/16/2012 8:00 AM 0.00 0.0 M M M
4/17/2012 8:00 AM 0.00 0.0 M M M
4/18/2012 7:30 AM 0.00 0.0 M M M
4/19/2012 8:00 AM 0.28 M M M M Steady light rain almost all day yesterday. Light enough so it all was probably absorbed, no run-off, as we've had such a dry spring.
4/20/2012 6:45 AM 0.00 0.0 M M M
4/21/2012 8:00 AM 0.00 0.0 M M M
4/22/2012 8:30 AM 0.29 M M M M Light rain began 7 PM through most of the evening, then started again early morning
4/23/2012 7:15 AM 1.20 M M M M
4/24/2012 7:45 AM 0.17 M M M M light rain for most of the daylight hours yesterday, but not much to show for it
4/25/2012 7:45 AM 0.00 0.0 M M M
4/26/2012 7:00 AM T M M M M
4/27/2012 8:00 AM T M M M M
4/28/2012 8:00 AM 0.00 0.0 M M M
4/29/2012 8:30 AM 0.23 M M M M
4/30/2012 8:00 AM T M M M M
5/1/2012 8:10 AM 0.14 M M M M
5/2/2012 8:00 AM 0.02 M M M M
5/3/2012 8:00 AM 0.01 M M M M
5/4/2012 8:00 AM 0.00 0.0 M M M
5/5/2012 9:00 AM 0.52 M M M M A brief deluge from a late-morning thunderstorm.
5/6/2012 9:00 AM T M M M M
5/7/2012 8:00 AM 0.00 0.0 M M M
5/8/2012 8:00 AM 0.00 0.0 M M M
5/9/2012 8:00 AM 0.13 M M M M Gentle afternoon rain
5/10/2012 7:45 AM 0.35 M M M M Nice, soaking rain, between 5 p.m. and midnight
5/11/2012 8:00 AM 0.00 0.0 M M M
5/12/2012 7:30 AM 0.00 0.0 M M M
5/13/2012 8:00 AM 0.00 0.0 M M M
5/14/2012 7:30 AM 0.09 M M M M A lovely steady rain, started around midnight
5/15/2012 7:30 AM 0.98 M M M M Steady, soaking rain through most of yesterday.
5/16/2012 7:45 AM 0.04 M M M M
5/17/2012 8:00 AM 0.00 0.0 M M M
5/21/2012 7:15 AM 0.26 M M M M rain started early this morning
5/22/2012 2:00 PM 0.26 M M M M
5/23/2012 7:30 AM 0.32 M M M M Not at my station, but: Major flooding yesterday in the southern part of Fairfax county, particularly the Occoquan River on the border. Water level up several feet, much detritus in the river.
5/24/2012 7:15 AM 0.83 M M M M A couple of thunderstorms...more of which passed just a mile to the north
5/25/2012 8:00 AM 0.05 M M M M Evening thunderstorm with gentle rain
5/26/2012 8:00 AM 0.00 0.0 M M M
5/27/2012 9:00 AM 0.00 0.0 M M M
5/28/2012 8:00 AM 0.29 M M M M A brief but strong storm rolled past after sunset
5/29/2012 8:00 AM 0.00 0.0 M M M
5/30/2012 7:30 AM 0.80 M M M M Very heavy rain from about 8:00 to 8:15 yesterday evening (about 1/2"), with a thunderstorm, tapering off for a couple hours
5/31/2012 8:00 AM 0.00 0.0 M M M
6/1/2012 7:15 AM 0.01 M M M M Very light early-morning rain
6/2/2012 9:00 AM 2.37 M M M M A series of intense thunderstorms, from about 3 - 11 p.m.
6/3/2012 8:00 AM 0.00 0.0 M M M
6/4/2012 8:00 AM T M M M M
6/5/2012 8:00 AM 0.00 0.0 M M M
6/6/2012 8:00 AM 0.00 0.0 M M M
6/7/2012 8:00 AM 0.00 0.0 M M M
6/8/2012 7:30 AM 0.00 0.0 M M M Saw scattered rainclouds heading our way on the radar, but they'd evaporate or move aside to rain somewhere else!
6/9/2012 8:00 AM 0.00 0.0 M M M
6/10/2012 8:00 AM 0.00 0.0 M M M
6/11/2012 8:00 AM 0.00 0.0 M M M
6/12/2012 8:00 AM 0.06 M M M M Gentle pre-dawn rain
6/13/2012 7:30 AM 0.31 M M M M periods of moderate rain, but no thunderstorms
6/14/2012 8:00 AM 0.00 0.0 M M M
6/15/2012 8:00 AM 0.00 0.0 M M M
6/16/2012 8:00 AM 0.00 0.0 M M M
6/17/2012 7:15 AM 0.00 0.0 M M M
6/18/2012 8:45 AM 0.32 M M M M mostly from a pre-dawn shower; raining again at time of reading
6/19/2012 7:25 AM 0.06 M M M M
6/20/2012 7:30 AM 0.00 0.0 M M M
6/21/2012 8:00 AM 0.00 0.0 M M M
6/22/2012 8:00 AM 0.00 0.0 M M M very hot yesterday (100 F)
6/23/2012 9:00 AM 0.05 M M M M A moderate shower, a few rumbles of thunder. Many storms in the area as a cold front passed over, but they went elsewhere, not here.
6/24/2012 8:00 AM 0.00 0.0 M M M
6/25/2012 8:00 AM 0.00 0.0 M M M
6/26/2012 7:45 AM 0.01 M M M M Brief mid-day spattering
6/27/2012 8:00 AM 0.00 0.0 M M M
6/28/2012 8:00 AM 0.00 0.0 M M M
6/29/2012 8:00 AM 0.00 0.0 M M M
6/30/2012 8:00 AM 0.56 M M M M Severe thunderstorm with high winds hit around 10:30 pm. Many branches cracked off trees in our neighborhood. Our power out for 16 hours, about a million in DC metro still without power and temps around 100 again. Counting our blessings.
7/1/2012 8:45 AM T M M M M Very light shower before sunset. Electrical outages continue for over a million in the metro area, state of emergency in effect, from Friday night's storm.
7/2/2012 8:00 AM 0.00 0.0 M M M
7/3/2012 8:00 AM 0.00 0.0 M M M
7/4/2012 9:45 AM 0.34 M M M M evening thunderstorm
7/5/2012 8:00 AM 0.00 0.0 M M M
7/6/2012 8:00 AM 0.00 0.0 M M M
7/7/2012 8:00 AM 0.00 0.0 M M M
7/8/2012 8:00 AM 0.00 0.0 M M M
7/9/2012 8:00 AM 0.46 M M M M A couple of thunderstorms, starting late afternoon; drizzling at time of reading. Glad to see some precip.
7/10/2012 8:00 AM 0.01 M M M M
7/11/2012 8:00 AM 1.39 M M M M One of those quirky little summer storms that grow right overhead, out of nowhere, and then pour for an hour. This one had very slow movement.
7/12/2012 8:00 AM 0.00 0.0 M M M
7/13/2012 8:00 AM 0.01 M M M M
7/14/2012 8:00 AM 0.06 M M M M early morning shower
7/15/2012 8:00 AM 0.01 M M M M
7/16/2012 8:00 AM 0.05 M M M M
7/17/2012 8:30 AM T M M M M
7/18/2012 8:00 AM 0.00 0.0 M M M
7/19/2012 8:00 AM 0.00 0.0 M M M Plenty of storm clouds but no rain here
7/20/2012 8:45 AM 0.64 M M M M Thunderstorm beginning around 10:30 p.m., rained for a couple hours
7/21/2012 9:00 AM 0.39 M M M M
7/22/2012 8:50 AM 0.22 M M M M light rain and drizzle all day
7/23/2012 8:00 AM 0.02 M M M M drizzle, yesterday morning
7/24/2012 8:00 AM T 0.0 M M M a few sprinkles yesterday
7/25/2012 8:00 AM T M M M M
7/26/2012 8:00 AM 0.00 0.0 M M M
7/27/2012 9:00 AM 0.00 0.0 M M M The thunderstorms yesterday all passed us by - nada.
7/28/2012 8:00 AM 0.00 0.0 M M M
7/29/2012 8:00 AM T M M M M Felt a few drops when outside
7/30/2012 8:00 AM 0.00 0.0 M M M
8/1/2012 8:00 AM 0.04 M M M M
8/2/2012 8:00 AM 0.03 M M M M
8/3/2012 8:00 AM 0.00 0.0 M M M
8/4/2012 8:00 AM 0.00 0.0 M M M
8/5/2012 8:00 AM 0.00 0.0 M M M
8/6/2012 8:30 AM 0.03 M M M M Got just the edge of yesterday's storms. Very light rain at time of reading.
8/7/2012 8:00 AM 0.01 M M M M light rain yesterday morning
8/8/2012 8:00 AM 0.00 0.0 M M M
8/9/2012 8:30 AM 0.29 M M M M
8/17/2012 8:00 AM 0.00 0.0 M M M
8/18/2012 8:00 AM 0.43 M M M M overnight showers, fairly heavy at times
8/19/2012 8:00 AM 0.00 0.0 M M M
8/20/2012 8:30 AM 0.14 M M M M
8/21/2012 8:00 AM 0.09 M M M M
8/22/2012 8:00 AM T M M M M
8/23/2012 8:00 AM 0.00 0.0 M M M
8/24/2012 7:45 AM 0.00 0.0 M M M
8/25/2012 8:00 AM 0.00 0.0 M M M
8/26/2012 8:00 AM 0.17 M M M M
8/27/2012 8:00 AM 0.37 M M M M small scattered rainclouds and thunderstorms yesterday, most of which passed to our east
8/28/2012 7:45 AM 0.03 M M M M
8/29/2012 8:00 AM T M M M M
8/30/2012 8:00 AM 0.00 0.0 M M M
8/31/2012 8:00 AM 0.00 0.0 M M M
9/1/2012 8:00 AM T M M M M
9/2/2012 8:30 AM 0.08 M M M M Scattered remnant bits of Isaac
9/3/2012 8:20 AM 0.22 M M M M
9/4/2012 7:15 AM 0.02 M M M M
9/5/2012 8:00 AM 0.00 0.0 M M M
9/6/2012 7:15 AM 0.00 0.0 M M M
9/7/2012 7:15 AM 0.08 M M M M
9/8/2012 8:00 AM T M M M M
9/9/2012 8:30 AM 0.77 M M M M a strong front moved through around 3:30 pm, strong winds and a tornado reported a few miles away
9/10/2012 8:00 AM 0.00 0.0 M M M
9/11/2012 8:00 AM 0.00 0.0 M M M
9/12/2012 7:00 AM 0.00 0.0 M M M
9/13/2012 8:00 AM 0.00 0.0 M M M
9/14/2012 7:00 AM 0.00 0.0 M M M
9/15/2012 8:00 AM 0.00 0.0 M M M
9/16/2012 8:00 AM 0.00 0.0 M M M
9/18/2012 7:45 AM 0.19 M M M M Light rain at time of reading, storm clouds fast and low overhead
9/19/2012 7:15 AM 0.74 M M M M Rain through much of the day; heavy rain from about 3:30-4:00 p.m., but minor winds and little thunder
9/20/2012 8:00 AM 0.00 0.0 M M M
9/21/2012 8:00 AM 0.00 0.0 M M M
9/22/2012 8:00 AM 0.00 0.0 M M M
9/23/2012 8:00 AM T M M M M Just a few drops, as a small thunderstorm formed practically overhead and moved on
9/24/2012 8:00 AM 0.00 0.0 M M M
9/25/2012 8:00 AM 0.00 0.0 M M M
9/26/2012 8:30 AM 0.01 M M M M
9/27/2012 8:00 AM 0.03 M M M M Brief (but loud) thunderstorm around 11:30 pm
9/28/2012 7:15 AM 0.66 M M M M overnight thunderstorms
9/29/2012 8:45 AM 0.01 M M M M
9/30/2012 8:00 AM 0.00 0.0 M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
4/2/2012 4/05/2012 8:00 PM 4 0.19 M M
5/18/2012 5/20/2012 8:00 AM 3 0.00 M M
8/10/2012 8/16/2012 1:00 PM 7 1.17 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