Climate in Fairfax County, Virginia

Fairfax County, Virginia gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Fairfax County averages 19 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 199 sunny days per year in Fairfax County. The US average is 205 sunny days.

Fairfax County gets some kind of precipitation, on average, 118 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.

Weather Highlights

Summer High: the July high is around 87 degrees
Winter Low: the January low is 25
Rain: averages 43 inches of rain a year
Snow: averages 19 inches of snow a year

BESTPLACES COMFORT INDEX

The annual BestPlaces Comfort Index for Fairfax County is 7.3 (10=best), which means it is about average compared to other places in Virginia.

July is the hottest month for Fairfax County with an average high temperature of 86.7°, which ranks it as about average compared to other places in Virginia. In Fairfax County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fairfax County are September, May and June.

January has the coldest nighttime temperatures for Fairfax County with an average of 24.9°. This is about average compared to other places in Virginia.

In Fairfax County, there are 23.6 days annually when the high temperature is over 90°, which is about average compared to other places in Virginia.

In Fairfax County, there are 92.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Virginia.

In Fairfax County, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Virginia.

May is the wettest month in Fairfax County with 4.4 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Autumn with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 43.1 inches in Fairfax County means that it is drier than most places in Virginia.

May is the rainiest month in Fairfax County with 11.9 days of rain, and October is the driest month with only 8.2 rainy days. There are 117.6 rainy days annually in Fairfax County, which is rainier than most places in Virginia. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 19.4 inches in Fairfax County means that it is snowier than most places in Virginia. January is the snowiest month in Fairfax County with 7.0 inches of snow, and 5 months of the year have significant snowfall.

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