Average annual temperature is 13.1 °C
Absolute maximum temperature: 36.8 °C
Absolute minimum temperature: -17.1 °C
Number of sunny days: 224 days
Number of rainy days: 127 days
Number of snow days: 14 days
Look at detailed online map of Fairfax
* Weather data for Fairfax United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 11.5 | 17.4 | 23.3 | 30.9 | 31.0 | 35.2 | 36.2 | 36.8 | 34.5 | 33.2 | 21.6 | 16.2 |
| Average daytime temperature (°C) | 3.8 | 8.2 | 10.8 | 19.8 | 26.1 | 29.8 | 29.5 | 29.7 | 28.3 | 20.1 | 12.7 | 8.1 |
| Average temperature (°C) | -0.6 | 0.9 | 4.4 | 12.5 | 19.4 | 23.8 | 24.4 | 24.5 | 22.2 | 14.6 | 6.8 | 3.5 |
| Average night temperature (°C) | -4.1 | -4.1 | -0.2 | 6.6 | 13.3 | 17.9 | 19.9 | 20.3 | 16.9 | 10.0 | 2.1 | 0.0 |
| Absolute minimum temperature (°C) | -14.4 | -17.1 | -10.0 | -2.7 | 3.3 | 11.4 | 14.8 | 13.8 | 11.3 | -3.9 | -6.5 | -5.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.0 | 7.8 | 7.6 | 10.0 | 11.5 | 12.7 | 11.1 | 11.1 | 10.9 | 7.9 | 6.7 | 5.3 |
| Precipitation (mm) | 36 | 57 | 31 | 66 | 78 | 85 | 98 | 77 | 20 | 61 | 19 | 53 |
| Sunny days | 19 | 21 | 20 | 20 | 16 | 17 | 13 | 16 | 22 | 15 | 24 | 21 |
| Rainy days | 5 | 6 | 10 | 9 | 15 | 13 | 18 | 15 | 8 | 15 | 5 | 8 |
| Snow days | 7 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 |
The best time to visit Fairfax during the most sunny months:
The largest precipitation sum in Fairfax is at