Fairfax, VA Weather & Climate Normals
Fairfax's real weather, in one number
Fairfax, VA scores 48/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Fairfax's hottest and coldest months
Fairfax's hottest month is Jul, averaging 77°F; its coldest is Jan, averaging 34°F, a 43.3°F swing across the year, a middling gap by national standards.
Fairfax's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 43°F | 25°F | 2.94in | 6.9in |
| Feb | 46°F | 27°F | 2.61in | 7in |
| Mar | 55°F | 34°F | 3.5in | 3.9in |
| Apr | 67°F | 43°F | 3.47in | 0.1in |
| May | 75°F | 53°F | 4.72in | 0in |
| Jun | 83°F | 62°F | 4.3in | 0in |
| Jul | 88°F | 67°F | 4.15in | 0in |
| Aug | 86°F | 65°F | 3.53in | 0in |
| Sep | 79°F | 58°F | 3.94in | 0in |
| Oct | 68°F | 45°F | 3.65in | 0in |
| Nov | 57°F | 36°F | 3.13in | 0.3in |
| Dec | 47°F | 29°F | 3.3in | 2.8in |
Apr, May, Jun, Sep, and Oct are the best time to see Fairfax at its mildest; the rest of the year, plan around Jul's heat and Jan's cold.
Rain and snow in Fairfax
Fairfax averages 43.24in of precipitation a year across roughly 121 days with measurable rain or snow, and 21in of snow a year.
Where Fairfax ranks
Fairfax ranks 2343 of 4876 US cities in this dataset for comfort score, and 51 of 63 within VA. About 26,340 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Washington Dc Dulles Ap, VA US, 10.7 miles from Fairfax, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station