Weather History for Fort Belvoir, VA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 64 °F 52 °F 41 °F
Mean Temperature 60 °F 42 °F 34 °F
Min Temperature 59 °F 32 °F 22 °F
Degree Days  
Heating Degree Days (base 65) 32 23 4 716
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 10 1 0 20
Dew Point  
Dew Point 63 °F 33 °F 11 °F
Precipitation  
Precipitation 2.92 in 0.15 in 0.00 in 4.51 in
Snowdepth - - - -
Wind  
Wind 29 mph 3 mph 0 mph
Gust Wind 39 mph 22 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.71 in 30.20 in 29.44 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 12, 2011 Rise Set
Actual Time 7:17 AM EST 4:47 PM EST
Civil Twilight 6:47 AM EST 5:17 PM EST
Nautical Twilight 6:14 AM EST 5:50 PM EST
Astronomical Twilight 5:41 AM EST 6:22 PM EST
Moon 6:55 PM EST (12/12) 8:47 AM EST (12/12)
Length of Visible Light 10h 29m
Length of Day
9h 30m
Waning Gibbous, 96% of the Moon is Illuminated
Dec 12
Waning Gibbous
Dec 17
Last Quarter
Dec 24
New
Jan 1
First Quarter
Jan 9
Full

Weather History Calendar

Precipitation Actual month total 4.51 Average Month Total: 2.71
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
51 | 29 0.00
Average:
52 | 32 0.09
Fog
Actual:
55 | 26 0.00
Average:
52 | 32 0.09
Clear
Actual:
50 | 28 0.00
Average:
51 | 32 0.09
Fog
Actual:
55 | 28 0.00
Average:
51 | 32 0.10
Partly Cloudy
Actual:
60 | 34 0.00
Average:
50 | 32 0.10
Rain
Actual:
62 | 59 0.26
Average:
50 | 32 0.10
Rain
Actual:
61 | 38 2.92
Average:
49 | 32 0.10
Scattered Clouds
Actual:
46 | 29 0.00
Average:
49 | 31 0.10
Clear
Actual:
50 | 27 0.00
Average:
48 | 31 0.11
Scattered Clouds
Actual:
46 | 28 0.00
Average:
48 | 31 0.10
Clear
Actual:
43 | 24 0.00
Average:
48 | 31 0.10
Scattered Clouds
Actual:
45 | 22 0.00
Average:
48 | 30 0.10
Clear
Actual:
51 | 24 0.00
Average:
47 | 30 0.10
Partly Cloudy
Actual:
49 | 30 0.00
Average:
47 | 30 0.10
Rain
Actual:
64 | 43 0.00
Average:
47 | 29 0.10
Partly Cloudy
Actual:
61 | 41 0.00
Average:
46 | 29 0.10
Partly Cloudy
Actual:
41 | 27 0.00
Average:
46 | 28 0.09
Partly Cloudy
Actual:
42 | 26 0.00
Average:
45 | 28 0.09
Partly Cloudy
Actual:
53 | 22 0.00
Average:
45 | 27 0.09
Rain
Actual:
57 | 42 0.00
Average:
44 | 27 0.09
Rain
Actual:
62 | 44 0.10
Average:
44 | 27 0.08
Rain
Actual:
60 | 42 0.48
Average:
44 | 26 0.08
Rain
Actual:
51 | 36 0.18
Average:
44 | 26 0.08
Scattered Clouds
Actual:
46 | 28 0.00
Average:
44 | 26 0.07
Scattered Clouds
Actual:
49 | 25 0.00
Average:
44 | 26 0.07
Scattered Clouds
Actual:
50 | 28 0.00
Average:
44 | 26 0.07
Rain
Actual:
53 | 31 0.57
Average:
44 | 26 0.07
Scattered Clouds
Actual:
47 | 28 0.00
Average:
44 | 26 0.07
Partly Cloudy
Actual:
43 | 24 0.00
Average:
44 | 26 0.06
Scattered Clouds
Actual:
53 | 27 0.00
Average:
44 | 26 0.06
Partly Cloudy
Actual:
61 | 40 0.00
Average:
44 | 27 0.06
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

2011 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Dec high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 51 40 29 30 27 24 94 59 38 30.37 30.29 30.15 10 10 10 14 8 21 0.00  
2 55 40 26 35 28 25 100 84 38 30.58 30.38 30.34 10 6 0 6 0 - 0.00 Fog
3 50 39 28 32 29 26 94 75 43 30.69 30.63 30.59 10 10 10 6 1 - 0.00  
4 55 42 28 45 35 28 100 94 54 30.58 30.53 30.41 10 5 0 8 0 - 0.00 Fog
5 60 47 34 55 44 34 99 87 66 30.40 30.30 30.17 10 10 7 7 0 - 0.00  
6 62 60 59 63 60 55 100 97 87 30.14 30.01 29.93 10 7 0 7 4 - 0.26 Fog , Rain
7 61 50 38 62 56 35 100 98 84 29.92 29.77 29.56 10 4 1 29 3 39 2.92 Rain
8 46 38 29 36 26 22 97 65 40 30.38 30.21 29.85 10 10 10 22 12 32 0.00  
9 50 38 27 36 31 27 99 81 45 30.36 30.31 30.24 10 10 10 8 1 - 0.00  
10 46 38 28 33 22 12 98 56 28 30.57 30.39 30.25 10 10 10 16 4 26 0.00  
11 43 34 24 22 18 11 88 63 27 30.71 30.64 30.57 10 10 10 6 0 - 0.00  
12 45 34 22 29 25 21 96 78 43 30.64 30.56 30.50 10 10 10 6 0 - 0.00  
13 51 38 24 28 25 22 96 68 31 30.50 30.45 30.40 10 10 10 13 2 20 0.00  
14 49 40 30 35 32 27 89 69 49 30.45 30.39 30.30 10 10 10 5 1 - 0.00  
15 64 54 43 51 42 33 69 60 50 30.28 30.04 29.90 10 10 10 12 6 20 0.00 Rain
16 61 51 41 51 30 21 88 51 34 30.27 30.15 29.90 10 10 10 18 7 24 0.00  
17 41 34 27 28 23 20 92 59 43 30.25 30.22 30.19 10 10 10 15 5 18 0.00  
18 42 34 26 29 24 22 88 68 44 30.37 30.30 30.24 10 10 10 14 4 21 0.00  
19 53 38 22 33 26 21 94 65 35 30.33 30.21 30.09 10 10 10 8 2 - 0.00  
20 57 50 42 39 36 32 87 66 45 30.19 30.14 30.09 10 10 10 6 1 - 0.00 Rain
21 62 53 44 61 53 40 100 90 81 30.10 29.93 29.83 10 10 4 10 3 - 0.10 Rain
22 60 51 42 55 47 41 100 96 53 30.16 30.03 29.84 10 3 0 10 0 16 0.48 Fog , Rain
23 51 44 36 50 45 31 100 88 52 30.27 29.95 29.78 10 8 2 21 6 25 0.18 Rain
24 46 37 28 38 27 19 93 66 36 30.48 30.41 30.25 10 10 10 20 4 26 0.00  
25 49 37 25 36 29 24 96 83 49 30.41 30.23 30.04 10 10 9 7 1 - 0.00  
26 50 39 28 28 25 23 92 54 38 30.36 30.27 30.07 10 10 10 20 8 28 0.00  
27 53 42 31 54 41 28 100 95 64 30.23 29.58 29.44 10 4 0 16 3 28 0.57 Fog , Rain
28 47 38 28 41 25 15 99 57 34 30.04 29.82 29.55 10 10 10 21 7 33 0.00  
29 43 34 24 31 25 19 92 71 48 30.11 30.04 29.99 10 10 10 6 2 - 0.00  
30 53 40 27 37 32 27 96 71 44 30.08 29.98 29.88 10 10 10 7 1 - 0.00  
31 61 51 40 44 39 36 95 63 39 30.14 29.96 29.85 10 10 10 15 4 23 0.00