Weather History for KIAD - December, 2012

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Thursday, December 13, 2012

  Actual Average Record
Temperature  
Mean Temperature 38 °F 37 °F  
Max Temperature 49 °F 46 °F 71 °F (1984)
Min Temperature 26 °F 28 °F 7 °F (1988)
Degree Days  
Heating Degree Days 27 28  
Month to date heating degree days 239 340  
Since 1 July heating degree days 1218 1256  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1436 1178  
Moisture  
Dew Point 24 °F    
Average Humidity 56    
Maximum Humidity 78    
Minimum Humidity 34    
Precipitation  
Precipitation 0.00 in 0.09 in 1.47 in (1996)
Month to date precipitation 0.20 1.39  
Year to date precipitation 32.95 39.97  
Snow  
Snow 0.00 in 0.10 in 8.80 in (1966)
Month to date snowfall 0.0 1.2  
Since 1 July snowfall T 1.7  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.42 in    
Wind  
Wind Speed 4 mph (NNW)    
Max Wind Speed 9 mph    
Max Gust Speed 12 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 13, 2012 Rise Set
Actual Time 7:20 AM EST 4:48 PM EST
Civil Twilight 6:50 AM EST 5:18 PM EST
Nautical Twilight 6:16 AM EST 5:51 PM EST
Astronomical Twilight 5:44 AM EST 6:24 PM EST
Moon 7:26 AM EST (12/13) 5:28 PM EST (12/13)
Length of Visible Light 10h 27m
Length of Day
9h 28m
New Moon, 0% of the Moon is Illuminated
Dec 13
New Moon
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 36.0 °F 30.3 °F 26.1 °F 67% 30.40 in 10.0 mi North 6.9 mph - N/A   Overcast
1:52 AM 36.0 °F 33.3 °F 26.1 °F 67% 30.41 in 10.0 mi North 3.5 mph - N/A   Overcast
2:52 AM 33.1 °F 30.0 °F 27.0 °F 78% 30.44 in 10.0 mi NW 3.5 mph - N/A   Overcast
3:52 AM 34.0 °F 29.8 °F 26.1 °F 73% 30.42 in 10.0 mi NNW 4.6 mph - N/A   Overcast
4:52 AM 33.1 °F 30.0 °F 25.0 °F 72% 30.43 in 10.0 mi NNW 3.5 mph - N/A   Partly Cloudy
5:52 AM 32.0 °F 26.4 °F 25.0 °F 75% 30.45 in 10.0 mi NNW 5.8 mph - N/A   Mostly Cloudy
6:52 AM 32.0 °F 28.7 °F 25.0 °F 75% 30.45 in 10.0 mi North 3.5 mph - N/A   Scattered Clouds
7:52 AM 30.9 °F 26.2 °F 24.1 °F 76% 30.45 in 10.0 mi NNW 4.6 mph - N/A   Partly Cloudy
8:52 AM 35.1 °F 29.3 °F 26.1 °F 70% 30.46 in 10.0 mi NNW 6.9 mph - N/A   Partly Cloudy
9:52 AM 39.0 °F 35.7 °F 26.1 °F 60% 30.48 in 10.0 mi North 4.6 mph - N/A   Partly Cloudy
10:52 AM 44.1 °F 42.5 °F 25.0 °F 47% 30.48 in 10.0 mi North 3.5 mph - N/A   Clear
11:52 AM 46.0 °F 41.9 °F 23.0 °F 40% 30.45 in 10.0 mi NE 8.1 mph - N/A   Clear
12:52 PM 46.9 °F - 21.0 °F 36% 30.42 in 10.0 mi Variable 3.5 mph - N/A   Clear
1:52 PM 46.9 °F - 19.9 °F 34% 30.41 in 10.0 mi WSW 3.5 mph - N/A   Clear
2:52 PM 48.0 °F - 21.0 °F 34% 30.39 in 10.0 mi North 4.6 mph - N/A   Clear
3:52 PM 46.9 °F - 19.9 °F 34% 30.39 in 10.0 mi NW 4.6 mph - N/A   Clear
4:52 PM 39.9 °F - 23.0 °F 51% 30.38 in 10.0 mi Calm Calm - N/A   Clear
6:52 PM 33.8 °F - 24.8 °F 70% 30.38 in 10.0 mi Calm Calm - N/A   Clear
7:52 PM 28.9 °F 23.9 °F 23.0 °F 78% 30.39 in 10.0 mi SE 4.6 mph - N/A   Clear
8:52 PM 28.9 °F - 23.0 °F 78% 30.39 in 10.0 mi Calm Calm - N/A   Clear
9:52 PM 30.0 °F - 21.9 °F 72% 30.37 in 10.0 mi Calm Calm - N/A   Clear
10:52 PM 28.0 °F 24.2 °F 21.9 °F 78% 30.36 in 10.0 mi SSW 3.5 mph - N/A   Clear
11:52 PM 28.0 °F - 21.9 °F 78% 30.36 in 10.0 mi Calm Calm - N/A   Clear