Fairfax, Virginia gets 43 inches of rain, on average, per year. The US average is 39 inches of rain per year.
Fairfax averages 21 inches of snow per year. The US average is 26 inches of snow per year.
On average, there are 198 sunny days per year in Fairfax. The US average is 205 sunny days.
Summer High: the July high is around 83 degrees
Winter Low: the January low is 23
Sperling's Comfort Index for Fairfax is a 50 out of 100
A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
YOU SHOULD KNOW
Fairfax gets some kind of precipitation, on average, 116 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.