Dulles Airport, VA

3:52 AM EDT on June 28, 2017 (GMT -0400)
Washington Dulles International

Weather History for KIAD - December, 2012

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Monday, December 17, 2012

  Actual Average Record
Temperature  
Mean Temperature 49 °F 36 °F  
Max Temperature 53 °F 45 °F 70 °F (1984)
Min Temperature 45 °F 27 °F 3 °F (1989)
Degree Days  
Heating Degree Days 16 29  
Month to date heating degree days 326 455  
Since 1 July heating degree days 1305 1371  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1436 1178  
Moisture  
Dew Point 48 °F    
Average Humidity 93    
Maximum Humidity 100    
Minimum Humidity 86    
Precipitation  
Precipitation 0.04 in 0.09 in 0.75 in (2000)
Month to date precipitation 0.24 1.77  
Year to date precipitation 32.99 40.35  
Snow  
Snow 0.00 in 0.10 in 4.30 in (1973)
Month to date snowfall 0.0 1.7  
Since 1 July snowfall T 2.2  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 29.74 in    
Wind  
Wind Speed 5 mph (SE)    
Max Wind Speed 14 mph    
Max Gust Speed 16 mph    
Visibility 2 miles    
Events Fog , Rain    
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. 17, 2012 Rise Set
Actual Time 7:22 AM EST 4:49 PM EST
Civil Twilight 6:52 AM EST 5:19 PM EST
Nautical Twilight 6:19 AM EST 5:53 PM EST
Astronomical Twilight 5:46 AM EST 6:25 PM EST
Moon 10:32 AM EST (12/17) 10:06 PM EST (12/17)
Length of Visible Light 10h 26m
Length of Day
9h 26m
Waxing Crescent, 24% of the Moon is Illuminated
Dec 17
Waxing Crescent
Dec 20
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
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 46.0 °F - 45.0 °F 96% 29.83 in 5.0 mi Calm Calm - N/A   Overcast
1:52 AM 46.0 °F 44.8 °F 44.1 °F 93% 29.83 in 6.0 mi SE 3.5 mph - N/A   Overcast
2:19 AM 46.4 °F 42.9 °F 44.6 °F 93% 29.81 in 0.5 mi SE 6.9 mph - 0.00 in Rain Light Rain
2:52 AM 46.0 °F 42.5 °F 45.0 °F 96% 29.85 in 0.5 mi NNW 6.9 mph - 0.01 in   Overcast
3:52 AM 46.0 °F - 45.0 °F 96% 29.83 in 0.2 mi Calm Calm - 0.00 in   Overcast
4:52 AM 46.0 °F - 45.0 °F 96% 29.81 in 0.2 mi Calm Calm - N/A Fog Fog
5:52 AM 46.0 °F - 45.0 °F 96% 29.82 in 0.2 mi Calm Calm - N/A   Overcast
6:52 AM 46.0 °F 44.8 °F 45.0 °F 96% 29.82 in 0.2 mi North 3.5 mph - N/A Fog Fog
7:44 AM 46.4 °F 45.2 °F 46.4 °F 100% 29.83 in 0.2 mi NNW 3.5 mph - N/A Fog Fog
7:52 AM 45.0 °F 42.6 °F 45.0 °F 100% 29.84 in 0.1 mi NW 4.6 mph - N/A Fog Fog
7:59 AM 46.4 °F 44.3 °F 44.6 °F 93% 29.84 in 0.2 mi NW 4.6 mph - N/A Fog Fog
8:02 AM 44.6 °F 43.1 °F 44.6 °F 100% 29.84 in 0.1 mi NNW 3.5 mph - N/A Fog Fog
8:52 AM 46.0 °F - 46.0 °F 100% 29.84 in 0.2 mi Calm Calm - N/A Fog Fog
9:52 AM 46.9 °F - 46.0 °F 97% 29.86 in 0.2 mi North 4.6 mph - N/A   Overcast
10:52 AM 46.9 °F - 46.9 °F 100% 29.84 in 0.5 mi ENE 4.6 mph - N/A   Overcast
11:52 AM 48.0 °F - 46.9 °F 96% 29.83 in 0.5 mi Calm Calm - N/A   Overcast
12:52 PM 50.0 °F - 46.9 °F 89% 29.77 in 0.5 mi East 5.8 mph - N/A   Overcast
1:29 PM 50.0 °F - 48.2 °F 94% 29.76 in 1.5 mi East 4.6 mph - N/A   Overcast
1:38 PM 50.0 °F - 48.2 °F 94% 29.75 in 1.5 mi ESE 4.6 mph - N/A   Overcast
1:52 PM 51.1 °F - 48.0 °F 89% 29.75 in 1.5 mi SE 6.9 mph - N/A   Overcast
2:52 PM 51.1 °F - 48.0 °F 89% 29.74 in 1.5 mi ESE 3.5 mph - N/A   Overcast
3:52 PM 51.1 °F - 48.0 °F 89% 29.71 in 1.5 mi SE 9.2 mph - N/A   Overcast
4:42 PM 50.0 °F - 48.2 °F 94% 29.70 in 0.5 mi SSE 6.9 mph - N/A   Overcast
4:52 PM 50.0 °F - 48.9 °F 96% 29.70 in 0.5 mi SSE 8.1 mph - N/A   Overcast
7:52 PM 51.1 °F - 50.0 °F 96% 29.62 in 0.5 mi SE 10.4 mph - N/A   Overcast
8:52 PM 52.0 °F - 51.1 °F 97% 29.60 in 0.5 mi SE 9.2 mph - 0.00 in Fog Light Drizzle
9:52 PM 52.0 °F - 51.1 °F 97% 29.57 in 0.5 mi SSE 4.6 mph - 0.02 in   Light Drizzle
9:56 PM 51.8 °F - 51.8 °F 100% 29.58 in 1.5 mi Variable 3.5 mph - 0.00 in   Light Drizzle
10:09 PM 53.6 °F - 51.8 °F 94% 29.58 in 1.5 mi SSW 5.8 mph - 0.01 in   Light Drizzle
10:18 PM 53.6 °F - 51.8 °F 94% 29.58 in 7.0 mi South 6.9 mph - 0.01 in   Light Drizzle
10:52 PM 53.1 °F - 52.0 °F 96% 29.58 in 7.0 mi South 8.1 mph - 0.01 in   Overcast
11:23 PM 53.6 °F - 51.8 °F 94% 29.56 in 6.0 mi SSW 6.9 mph - 0.00 in Rain Light Rain
11:52 PM 53.1 °F - 52.0 °F 96% 29.55 in 5.0 mi SW 3.5 mph - 0.00 in   Overcast