average temperature in fairfax, va
CLIMATE OVERVIEW. Fairfax, Virginia, gets 42 inches of rain per year. The US average is 39. Snowfall is 21 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 76. On average, there are 198 sunny days per year in Fairfax, Virginia. The July high is around 87 degrees. The January low is 24. Sperling's comfort index for Fairfax is a 50 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.