Washington National Airport

The tables below display average monthly climate and weather indicators in Washington National Airport District of Columbia. Temperature by: Fahrenheit / Centigrade Washington National Airport Temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Avg. Temperature 34.6 37.5 47.2 56.5 66.4 75.6 80.0 78.5 71.3 59.7 49.8 39.4 58.0 Avg. Max Temperature 42.3 45.9 56.5 66.7 76.2 84.7 88.5 86.9 80.1 69.1 58.3 47.0 66.9 Avg. Min Temperature 26.8 29.1 37.7 46.4 56.6 66.5 71.4 70.0 62.5 50.3 41.1 31.7 49.2 Days with Max Temp of 90 F or Higher 0.0 0.0 0.0 < 0.5 2.0 8.0 14.0 10.0 4.0 < 0.5 0.0 0.0 37.0 Days with Min Temp Below Freezing 22.0 18.0 8.0 1.0 0.0 0.0 0.0 0.0 0.0 < 0.5 5.0 15.0 69.0     Washington National Airport Heating and Cooling Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Heating Degree Days 942 770 552 264 60.0 0.0 0.0 0.0 14.0 195 456 794 4047 Cooling Degree Days 0.0 0.0 0.0 9.0 104 318 465 419 203 31.0 0.0 0.0 1549     Washington National Airport Precipitation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Precipitation (inches) 2.7 2.7 3.2 2.7 3.7 3.4 3.8 3.9 3.3 3.0 3.1 3.1 38.6 Days with Precipitation 0.01 inch or More 10.0 9.0 11.0 10.0 11.0 10.0 10.0 9.0 8.0 7.0 9.0 9.0 113 Monthly Snowfall (inches) 5.5 5.4 2.2 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 0.0 0.0 0.8 2.8 16.7     Other Washington National Airport Weather Indicators Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Average Wind Speed 10.0 10.3 10.9 10.5 9.3 8.9 8.3 8.1 8.3 8.7 9.4 9.6 9.4 Clear Days 7.0 7.0 7.0 7.0 7.0 7.0 7.0 9.0 10.0 11.0 8.0 8.0 96.0 Partly Cloudy Days 7.0 7.0 8.0 9.0 10.0 11.0 12.0 10.0 8.0 8.0 8.0 7.0 106 Cloudy Days 16.0 15.0 15.0 14.0 14.0 11.0 12.0 12.0 12.0 12.0 14.0 16.0 164 Percent of Possible Sunshine 46.0 50.0 55.0 57.0 58.0 64.0 62.0 62.0 61.0 59.0 51.0 46.0 56.0 Avg. Relative Humidity 54.0 63.0 62.0 60.0 61.5 64.5 64.5 66.5 68.0 67.5 64.0 63.0 66.0

Weather information for other cities in District of Columbia • Washington Dulles Airport Weather