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. Temperature 30.6 33.6 43.2 52.7 62.2 71.0 75.6 74.2 67.1 55.1 45.4 35.4 53.8 Avg. Max Temperature 40.1 43.8 54.6 65.1 74.3 82.8 87.0 85.5 78.9 67.7 56.7 45.0 65.1 Avg. Min Temperature 21.0 23.3 31.8 40.3 50.0 59.2 64.1 62.8 55.4 42.4 34.2 25.8 42.5 Days with Max Temp of 90 F or Higher 0.0 0.0 0.0 < 0.5 1.0 5.0 12.0 8.0 3.0 < 0.5 0.0 0.0 29.0 Days with Min Temp Below Freezing 26.0 22.0 17.0 6.0 < 0.5 0.0 0.0 0.0 < 0.5 5.0 15.0 23.0 114     Washington Dulles Airport Heating and Cooling Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Heating Degree Days 1066 879 676 369 140 7.0 0.0 0.0 44.0 319 588 918 5006 Cooling Degree Days 0.0 0.0 0.0 0.0 53.0 187 329 285 107 12.0 0.0 0.0 973     Washington Dulles Airport Precipitation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Precipitation (inches) 2.7 2.8 3.2 3.1 4.0 3.9 3.5 3.9 3.4 3.2 3.3 3.2 40.2 Days with Precipitation 0.01 inch or More 10.0 9.0 10.0 10.0 12.0 10.0 10.0 9.0 9.0 8.0 9.0 10.0 118 Monthly Snowfall (inches) 7.4 6.8 3.4 0.4 < 0.05 < 0.05 0.0 < 0.05 0.0 0.0 1.2 3.5 22.7     Other Washington Dulles Airport Weather Indicators Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Average Wind Speed 8.2 8.6 9.0 8.8 7.4 6.8 6.2 5.8 6.2 6.6 7.6 7.7 7.4 Clear Days 7.0 7.0 7.0 7.0 7.0 6.0 8.0 8.0 9.0 11.0 7.0 7.0 92.0 Partly Cloudy Days 7.0 6.0 8.0 9.0 10.0 12.0 11.0 11.0 9.0 8.0 8.0 7.0 105 Cloudy Days 17.0 15.0 16.0 14.0 14.0 12.0 12.0 12.0 12.0 12.0 15.0 17.0 168 Avg. Relative Humidity 53.5 68.5 66.5 64.0 65.5 69.5 71.0 72.0 72.5 72.5 68.5 67.0 70.5

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