Washington Dulles Airport

The tables below display average monthly climate and weather indicators in Washington Dulles Airport District of Columbia.

Temperature by: Fahrenheit / Centigrade

Washington Dulles Airport Temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Avg. Temperature30.633.643.252.762.271.075.674.267.155.145.435.453.8
Avg. Max Temperature40.143.854.665.174.382.887.085.578.967.756.745.065.1
Avg. Min Temperature21.023.331.840.350.059.264.162.855.442.434.225.842.5
Days with Max Temp of 90 F or Higher0.00.00.0< 0.51.05.012.08.03.0< 0.50.00.029.0
Days with Min Temp Below Freezing26.022.017.06.0< 0.50.00.00.0< 0.55.015.023.0114
 
Washington Dulles Airport Heating and Cooling Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Heating Degree Days10668796763691407.00.00.044.03195889185006
Cooling Degree Days0.00.00.00.053.018732928510712.00.00.0973
 
Washington Dulles Airport Precipitation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Precipitation (inches)2.72.83.23.14.03.93.53.93.43.23.33.240.2
Days with Precipitation 0.01 inch or More10.09.010.010.012.010.010.09.09.08.09.010.0118
Monthly Snowfall (inches)7.46.83.40.4< 0.05< 0.050.0< 0.050.00.01.23.522.7
 
Other Washington Dulles Airport Weather Indicators Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average Wind Speed8.28.69.08.87.46.86.25.86.26.67.67.77.4
Clear Days7.07.07.07.07.06.08.08.09.011.07.07.092.0
Partly Cloudy Days7.06.08.09.010.012.011.011.09.08.08.07.0105
Cloudy Days17.015.016.014.014.012.012.012.012.012.015.017.0168
Percent of Possible Sunshine0000000000000
Avg. Relative Humidity53.568.566.564.065.569.571.072.072.572.568.567.070.5

Weather information for other cities in District of Columbia

Portions of this site are based on the CIA World Fact Book, a public-domain work
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