Weather History for Dulles Airport, VA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 62 °F 51 °F 40 °F
Mean Temperature 59 °F 42 °F 32 °F
Min Temperature 56 °F 31 °F 19 °F
Degree Days  
Heating Degree Days (base 65) 33 23 6 723
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 8 0 0 12
Dew Point  
Dew Point 61 °F 32 °F 12 °F
Precipitation  
Precipitation 2.14 in 0.17 in 0.00 in 4.46 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 29 mph 6 mph 0 mph
Gust Wind 41 mph 22 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.70 in 30.19 in 29.43 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 05, 2011 Rise Set
Actual Time 7:13 AM EST 4:47 PM EST
Civil Twilight 6:43 AM EST 5:17 PM EST
Nautical Twilight 6:10 AM EST 5:50 PM EST
Astronomical Twilight 5:37 AM EST 6:22 PM EST
Moon 1:42 PM EST (12/5) 2:34 AM EST (12/5)
Length of Visible Light 10h 33m
Length of Day
9h 34m
Waxing Gibbous, 79% of the Moon is Illuminated
Dec 5
Waxing Gibbous
Dec 10
Full
Dec 17
Last Quarter
Dec 24
New
Jan 1
First Quarter

Weather History Calendar

Precipitation Actual month total 4.46 Normal Month Total: 2.96
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
50 | 28 0.00
Average:
51 | 31 0.11
Scattered Clouds
Actual:
57 | 23 0.00
Average:
51 | 31 0.11
Partly Cloudy
Actual:
50 | 26 0.00
Average:
50 | 30 0.11
Fog
Actual:
55 | 29 0.00
Average:
50 | 30 0.11
Mostly Cloudy
Actual:
59 | 36 0.00
Average:
49 | 30 0.11
Rain
Actual:
62 | 56 0.21
Average:
49 | 29 0.11
Rain
Actual:
62 | 37 2.14
Average:
49 | 29 0.11
Partly Cloudy
Actual:
45 | 29 0.00
Average:
48 | 29 0.10
Partly Cloudy
Actual:
51 | 25 0.00
Average:
48 | 29 0.11
Partly Cloudy
Actual:
46 | 27 0.00
Average:
47 | 28 0.11
Clear
Actual:
42 | 21 0.00
Average:
47 | 28 0.10
Partly Cloudy
Actual:
44 | 19 0.00
Average:
47 | 28 0.11
Scattered Clouds
Actual:
50 | 22 0.00
Average:
46 | 28 0.09
Rain
Actual:
49 | 32 T
Average:
46 | 27 0.10
Rain
Actual:
62 | 42 T
Average:
46 | 27 0.09
Mostly Cloudy
Actual:
62 | 39 0.00
Average:
46 | 27 0.10
Partly Cloudy
Actual:
40 | 27 0.00
Average:
45 | 27 0.09
Partly Cloudy
Actual:
43 | 26 0.00
Average:
45 | 26 0.09
Partly Cloudy
Actual:
52 | 24 0.00
Average:
45 | 26 0.09
Mostly Cloudy
Actual:
56 | 43 0.00
Average:
45 | 26 0.08
Rain
Actual:
61 | 44 0.08
Average:
44 | 26 0.09
Rain
Actual:
60 | 40 1.12
Average:
44 | 26 0.09
Rain
Actual:
50 | 42 0.20
Average:
44 | 25 0.09
Rain
Actual:
45 | 28 T
Average:
44 | 25 0.09
Scattered Clouds
Actual:
49 | 24 0.00
Average:
44 | 25 0.09
Partly Cloudy
Actual:
48 | 31 0.00
Average:
43 | 25 0.09
Rain
Actual:
46 | 38 0.71
Average:
43 | 25 0.08
Partly Cloudy
Actual:
45 | 30 0.00
Average:
43 | 25 0.08
Partly Cloudy
Actual:
41 | 22 0.00
Average:
43 | 25 0.08
Partly Cloudy
Actual:
54 | 26 0.00
Average:
43 | 25 0.08
Rain
Actual:
59 | 37 T
Average:
43 | 24 0.07
 

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 50 39 28 29 27 25 85 62 39 30.35 30.29 30.15 10 10 10 15 7 20 0.00  
2 57 40 23 32 27 22 92 62 32 30.57 30.39 30.31 10 10 10 16 3 26 0.00  
3 50 38 26 31 28 23 92 71 50 30.68 30.61 30.57 10 10 6 8 3 16 0.00  
4 55 42 29 40 35 27 100 74 47 30.56 30.47 30.39 10 9 6 17 5 21 0.00 Fog
5 59 48 36 54 44 36 92 77 61 30.37 30.27 30.14 10 10 10 13 4 16 0.00  
6 62 59 56 61 59 55 100 90 80 30.11 30.01 29.90 10 9 4 15 8 22 0.21 Rain
7 62 50 37 61 50 34 100 93 86 29.90 29.75 29.58 10 4 1 28 10 36 2.14 Rain
8 45 37 29 32 25 22 92 69 45 30.35 30.19 29.88 10 10 10 25 8 41 0.00  
9 51 38 25 31 28 24 92 67 42 30.34 30.28 30.22 10 10 10 15 3 20 0.00  
10 46 37 27 29 21 13 82 58 33 30.55 30.38 30.25 10 10 10 20 8 32 0.00  
11 42 32 21 20 17 12 84 57 30 30.70 30.63 30.55 10 10 10 9 1 12 0.00  
12 44 32 19 29 23 17 92 69 45 30.63 30.55 30.48 10 10 8 13 1 15 0.00  
13 50 36 22 27 24 20 88 64 39 30.49 30.44 30.39 10 10 8 16 4 21 0.00  
14 49 41 32 34 31 28 89 70 50 30.44 30.37 30.27 10 10 10 9 3 14 T Rain
15 62 52 42 50 41 33 70 63 55 30.25 30.02 29.87 10 10 10 22 12 30 T Rain
16 62 51 39 50 29 24 77 58 39 30.25 30.14 29.88 10 10 10 28 11 36 0.00  
17 40 34 27 27 24 21 92 70 48 30.24 30.21 30.17 10 10 10 18 7 23 0.00  
18 43 35 26 25 24 22 84 65 45 30.35 30.28 30.21 10 10 10 15 5 21 0.00  
19 52 38 24 30 26 21 81 61 41 30.31 30.18 30.07 10 10 10 16 7 20 0.00  
20 56 50 43 39 36 32 71 61 51 30.18 30.12 30.08 10 10 10 8 3 13 0.00  
21 61 53 44 57 50 37 93 80 66 30.07 29.90 29.79 10 10 8 21 7 28 0.08 Fog , Rain
22 60 50 40 51 45 40 100 77 53 30.14 29.99 29.83 10 7 1 13 3 16 1.12 Fog , Rain
23 50 46 42 48 39 32 100 78 56 30.25 30.05 29.77 10 9 2 22 9 29 0.20 Rain
24 45 37 28 36 27 22 85 63 41 30.48 30.39 30.24 10 10 10 23 6 31 T Rain
25 49 37 24 32 26 22 92 69 46 30.40 30.20 30.03 10 10 9 12 4 15 0.00  
26 48 40 31 27 26 24 78 60 42 30.34 30.25 30.04 10 10 10 26 11 36 0.00  
27 46 42 38 43 37 26 100 78 55 30.20 29.69 29.43 10 6 0 15 7 23 0.71 Fog , Rain
28 45 38 30 34 25 17 92 68 43 30.03 29.80 29.54 10 10 10 29 13 37 0.00  
29 41 32 22 29 24 19 88 71 54 30.08 30.02 29.96 10 10 10 12 3 14 0.00  
30 54 40 26 37 31 25 92 68 44 30.05 29.96 29.86 10 10 10 12 3 17 0.00  
31 59 48 37 45 39 36 100 74 47 30.12 29.94 29.83 10 10 10 22 7 26 T Rain