Fairfax, VA
Climate overview — based on NOAA 1991-2020 normals from VIENNA, VA US.
Year-round temperatures (°F)
Climate summary
Fairfax has an annual average temperature of 54°F with about 43.6 inches of precipitation per year and 18.5 inches of snow. The warmest month is July (average high 83.8°F), and the coldest is January (average low 23.4°F). May is typically the wettest month (4.28 in) and February the driest (2.62 in). Snow typically falls from December through March.
Best time to visit Fairfax
Full guide →Climate change signal
All-time records →146 of 366 (39.9%) of Fairfax's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1920s | 0 | |
| 1940s | 6 | |
| 1950s | 0 | |
| 1960s | 0 | |
| 1970s | 0 | |
| 1980s | 0 | |
| 1990s | 47 | |
| 2000s | 89 | |
| 2010s | 180 | |
| 2020s | 44 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 42.3°F | 23.4°F | 32.9°F | 3.28 in | 6.5 in | 12 |
| February | 45.3°F | 24.3°F | 34.8°F | 2.62 in | 7.5 in | 9 |
| March | 53.3°F | 31.6°F | 42.4°F | 3.84 in | 2.0 in | 11 |
| April | 64.8°F | 41.2°F | 53.0°F | 3.39 in | — | 11 |
| May | 71.6°F | 52.1°F | 61.9°F | 4.28 in | — | 13 |
| June | 79.5°F | 61.0°F | 70.2°F | 4.13 in | — | 11 |
| July | 83.8°F | 66.6°F | 75.2°F | 4.26 in | — | 10 |
| August | 82.4°F | 64.9°F | 73.6°F | 3.54 in | — | 10 |
| September | 75.9°F | 57.1°F | 66.5°F | 4.16 in | — | 9 |
| October | 65.4°F | 45.2°F | 55.3°F | 3.51 in | — | 9 |
| November | 55.8°F | 34.6°F | 45.2°F | 3.13 in | 0.1 in | 9 |
| December | 46.2°F | 28.3°F | 37.2°F | 3.43 in | 2.4 in | 11 |
Climate twins of Fairfax
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).