Weather History for KIAD - December, 2012

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Tuesday, December 18, 2012

  Actual Average Record
Temperature  
Mean Temperature 45 °F 36 °F  
Max Temperature 58 °F 45 °F 76 °F (2006)
Min Temperature 31 °F 26 °F 3 °F (1989)
Degree Days  
Heating Degree Days 20 29  
Month to date heating degree days 346 484  
Since 1 July heating degree days 1325 1400  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1436 1178  
Moisture  
Dew Point 41 °F    
Average Humidity 74    
Maximum Humidity 100    
Minimum Humidity 47    
Precipitation  
Precipitation T in 0.09 in 2.92 in (1977)
Month to date precipitation 0.24 1.86  
Year to date precipitation 32.99 40.44  
Snow  
Snow 0.00 in 0.10 in 2.20 in (2009)
Month to date snowfall 0.0 1.8  
Since 1 July snowfall T 2.3  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 29.64 in    
Wind  
Wind Speed 10 mph (West)    
Max Wind Speed 28 mph    
Max Gust Speed 36 mph    
Visibility 7 miles    
Events Fog , Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 18, 2012 Rise Set
Actual Time 7:23 AM EST 4:49 PM EST
Civil Twilight 6:53 AM EST 5:19 PM EST
Nautical Twilight 6:19 AM EST 5:53 PM EST
Astronomical Twilight 5:47 AM EST 6:25 PM EST
Moon 11:05 AM EST (12/18) 11:10 PM EST (12/18)
Length of Visible Light 10h 26m
Length of Day
9h 26m
Waxing Crescent, 34% of the Moon is Illuminated
Dec 18
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
12:49 AM 53.6 °F - 51.8 °F 94% 29.54 in 8.0 mi SSW 8.1 mph - N/A   Overcast
12:52 AM 53.1 °F - 51.1 °F 93% 29.55 in 8.0 mi SW 6.9 mph - N/A   Overcast
1:34 AM 51.8 °F - 50.0 °F 94% 29.55 in 8.0 mi SW 11.5 mph 19.6 mph N/A   Overcast
1:52 AM 50.0 °F - 48.9 °F 96% 29.55 in 9.0 mi SSW 12.7 mph - N/A   Overcast
2:52 AM 50.0 °F - 48.9 °F 96% 29.56 in 6.0 mi SW 9.2 mph - N/A   Overcast
3:52 AM 48.9 °F - 48.0 °F 97% 29.55 in 7.0 mi SSW 5.8 mph - N/A   Overcast
4:52 AM 48.0 °F - 46.9 °F 96% 29.55 in 6.0 mi SSW 4.6 mph - N/A Fog Patches of Fog
5:52 AM 48.0 °F - 46.9 °F 96% 29.56 in 5.0 mi South 4.6 mph - N/A Fog Patches of Fog
6:52 AM 46.9 °F - 46.0 °F 97% 29.57 in 0.2 mi Calm Calm - N/A Fog Patches of Fog
7:52 AM 46.0 °F 44.8 °F 46.0 °F 100% 29.59 in 0.2 mi SSW 3.5 mph - N/A Fog Patches of Fog
8:52 AM 46.0 °F - 46.0 °F 100% 29.60 in 0.2 mi Calm Calm - N/A   Overcast
9:22 AM 46.4 °F 45.2 °F 46.4 °F 100% 29.61 in 0.2 mi West 3.5 mph - N/A   Mostly Cloudy
9:45 AM 48.2 °F - 46.4 °F 93% 29.61 in 0.2 mi Calm Calm - N/A   Scattered Clouds
9:52 AM 50.0 °F - 46.9 °F 89% 29.61 in 6.0 mi WNW 3.5 mph - N/A   Scattered Clouds
10:52 AM 55.9 °F - 44.1 °F 64% 29.61 in 10.0 mi West 11.5 mph - N/A   Scattered Clouds
11:52 AM 55.9 °F - 37.9 °F 51% 29.60 in 10.0 mi West 13.8 mph 24.2 mph N/A   Mostly Cloudy
12:52 PM 57.0 °F - 37.0 °F 47% 29.59 in 10.0 mi West 17.3 mph 28.8 mph N/A   Mostly Cloudy
1:17 PM 55.4 °F - 37.4 °F 51% 29.61 in 10.0 mi WNW 21.9 mph 29.9 mph 0.00 in Rain Light Rain
1:52 PM 55.0 °F - 36.0 °F 49% 29.63 in 10.0 mi NW 19.6 mph 35.7 mph 0.00 in   Mostly Cloudy
2:52 PM 53.1 °F - 35.1 °F 50% 29.66 in 10.0 mi WNW 20.7 mph 31.1 mph N/A   Scattered Clouds
3:52 PM 51.1 °F - 32.0 °F 48% 29.69 in 10.0 mi WNW 21.9 mph 32.2 mph N/A   Scattered Clouds
4:52 PM 48.0 °F - 32.0 °F 54% 29.71 in 10.0 mi WNW 23.0 mph 29.9 mph N/A   Mostly Cloudy
5:52 PM 46.9 °F - 32.0 °F 56% 29.73 in 10.0 mi WNW 16.1 mph - N/A   Scattered Clouds
6:52 PM 46.9 °F - 30.9 °F 54% 29.76 in 10.0 mi NW 18.4 mph 24.2 mph N/A   Clear
7:52 PM 45.0 °F 39.3 °F 30.9 °F 58% 29.78 in 10.0 mi NW 11.5 mph - N/A   Partly Cloudy
8:52 PM 43.0 °F 38.2 °F 30.9 °F 62% 29.81 in 10.0 mi NW 8.1 mph - N/A   Clear
9:52 PM 41.0 °F 37.1 °F 30.0 °F 65% 29.81 in 10.0 mi NW 5.8 mph - N/A   Clear
10:52 PM 37.0 °F - 28.9 °F 73% 29.81 in 10.0 mi Calm Calm - N/A   Scattered Clouds
11:52 PM 30.9 °F - 28.0 °F 89% 29.83 in 10.0 mi Calm Calm - N/A   Scattered Clouds