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Fairfax County, Virginia, gets 43 inches of rain per year. The US average is 39. Snowfall is 19 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 109.

On average, there are 199 sunny days per year in Fairfax County, Virginia. The July high is around 85 degrees. The January low is 25. Sperling's comfort index for Fairfax County is a 51 out of 100, where a higher score indicates a more comfortable year-around 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.

  CLIMATEFairfax, VirginiaUnited States
  Rainfall (in.)  42.939.2
  Snowfall (in.)  19.425.8
  Precipitation Days  109102
  Sunny Days  199205
  Avg. July High  85.386.1
  Avg. Jan. Low  24.722.6
  Comfort Index (higher=better)  5154
  UV Index  44.3
  Elevation ft.  2661,443


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