Dulles Airport, VA

3:42 AM EDT on June 24, 2017 (GMT -0400)
Washington Dulles International

Weather History for KIAD - December, 2011

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Thursday, December 29, 2011

  Actual Average Record
Temperature  
Mean Temperature 32 °F 34 °F  
Max Temperature 41 °F 43 °F 78 °F (1984)
Min Temperature 22 °F 25 °F 7 °F (1977)
Degree Days  
Heating Degree Days 33 31  
Month to date heating degree days 681 820  
Since 1 July heating degree days 1486 1736  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1497 1178  
Moisture  
Dew Point 24 °F    
Average Humidity 71    
Maximum Humidity 88    
Minimum Humidity 54    
Precipitation  
Precipitation 0.00 in 0.08 in 1.27 in (2013)
Month to date precipitation 4.46 2.81  
Year to date precipitation 46.20 41.39  
Snow  
Snow T in 0.10 in 3.30 in (1962)
Month to date snowfall T 3.2  
Since 1 July snowfall 0.6 3.7  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.02 in    
Wind  
Wind Speed 3 mph (SSW)    
Max Wind Speed 12 mph    
Max Gust Speed 14 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Date:

Astronomy

Dec. 29, 2011 Rise Set
Actual Time 7:27 AM EST 4:55 PM EST
Civil Twilight 6:58 AM EST 5:25 PM EST
Nautical Twilight 6:24 AM EST 5:59 PM EST
Astronomical Twilight 5:52 AM EST 6:31 PM EST
Moon 10:23 AM EST (12/29) 10:27 PM EST (12/29)
Length of Visible Light 10h 27m
Length of Day
9h 27m
Waxing Crescent, 26% of the Moon is Illuminated
Dec 29
Waxing Crescent
Jan 1
First Quarter
Jan 9
Full
Jan 16
Last Quarter
Jan 23
New

Hourly Weather History & Observations

Time (EST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:52 AM 30.0 °F 23.2 °F 19.0 °F 64% 30.03 in 10.0 mi WNW 6.9 mph - N/A   Scattered Clouds
1:52 AM 28.9 °F 25.2 °F 19.0 °F 67% 30.04 in 10.0 mi WNW 3.5 mph - N/A   Partly Cloudy
2:52 AM 27.0 °F - 19.0 °F 72% 30.03 in 10.0 mi Calm Calm - N/A   Clear
3:52 AM 24.1 °F - 19.9 °F 84% 30.03 in 10.0 mi Calm Calm - N/A   Clear
4:52 AM 25.0 °F 20.7 °F 19.9 °F 81% 30.04 in 10.0 mi WNW 3.5 mph - N/A   Clear
5:52 AM 23.0 °F - 19.0 °F 85% 30.04 in 10.0 mi Calm Calm - N/A   Partly Cloudy
6:52 AM 25.0 °F - 21.0 °F 85% 30.06 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:52 AM 26.1 °F 21.9 °F 21.9 °F 84% 30.06 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
8:52 AM 28.9 °F - 24.1 °F 82% 30.08 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
9:52 AM 33.8 °F 30.8 °F 24.8 °F 70% 30.08 in 10.0 mi South 3.5 mph - N/A   Overcast
10:52 AM 35.6 °F 31.7 °F 23.0 °F 60% 30.06 in 10.0 mi SSE 4.6 mph - N/A   Mostly Cloudy
11:52 AM 37.4 °F 32.1 °F 24.8 °F 60% 30.04 in 10.0 mi SSW 6.9 mph - N/A   Overcast
12:52 PM 37.9 °F - 24.1 °F 57% 30.03 in 10.0 mi Calm Calm - N/A   Overcast
1:52 PM 37.9 °F 35.5 °F 26.1 °F 62% 30.01 in 10.0 mi North 3.5 mph - N/A   Overcast
2:52 PM 39.9 °F 34.5 °F 27.0 °F 60% 29.96 in 10.0 mi ESE 8.1 mph - N/A   Mostly Cloudy
3:52 PM 41.0 °F 35.8 °F 26.1 °F 55% 29.99 in 10.0 mi SSE 8.1 mph - N/A   Overcast
4:52 PM 39.2 °F 37.0 °F 26.6 °F 61% 29.97 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
5:52 PM 39.0 °F 36.8 °F 27.0 °F 62% 29.98 in 10.0 mi South 3.5 mph - N/A   Overcast
6:52 PM 39.0 °F 36.8 °F 28.0 °F 65% 29.99 in 10.0 mi South 3.5 mph - N/A   Overcast
7:52 PM 39.0 °F - 28.9 °F 67% 29.99 in 10.0 mi Calm Calm - N/A   Overcast
8:52 PM 37.9 °F 35.5 °F 28.9 °F 70% 29.97 in 10.0 mi South 3.5 mph - N/A   Overcast
9:52 PM 36.0 °F 31.1 °F 28.0 °F 73% 29.96 in 10.0 mi South 5.8 mph - N/A   Mostly Cloudy
10:52 PM 37.0 °F - 28.0 °F 70% 29.98 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
11:52 PM 33.8 °F 29.6 °F 26.6 °F 75% 29.96 in 10.0 mi NW 4.6 mph - N/A   Scattered Clouds