Average annual temperature is 14.6 °C
Absolute maximum temperature: 38.3 °C
Absolute minimum temperature: -8.9 °C
Number of sunny days: 187 days
Number of rainy days: 177 days
Number of snow days: 1 day
Look at detailed online map of Prince William County
* Weather data for Prince William County 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) | 19.1 | 24.1 | 27.5 | 31.8 | 30.3 | 33.0 | 38.3 | 34.3 | 37.1 | 28.7 | 26.5 | 17.3 |
| Average daytime temperature (°C) | 10.4 | 13.0 | 14.2 | 22.9 | 23.3 | 28.0 | 32.4 | 30.9 | 27.0 | 21.6 | 14.0 | 10.9 |
| Average temperature (°C) | 5.8 | 7.1 | 7.7 | 15.5 | 16.7 | 21.4 | 25.7 | 24.5 | 21.1 | 15.4 | 7.8 | 5.8 |
| Average night temperature (°C) | 2.2 | 2.4 | 2.5 | 9.5 | 10.7 | 15.5 | 20.7 | 19.5 | 16.3 | 10.5 | 3.3 | 1.9 |
| Absolute minimum temperature (°C) | -3.1 | -8.9 | -4.5 | 1.1 | 5.9 | 11.1 | 17.8 | 15.1 | 9.6 | 5.4 | -5.2 | -3.8 |
| 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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 13.6 | 12.4 | 11.2 | 10.1 | 9.5 |
| 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) | 5.2 | 6.4 | 7.7 | 9.1 | 10.5 | 11.1 | 12.0 | 11.0 | 8.6 | 8.7 | 7.7 | 5.6 |
| Precipitation (mm) | 63 | 57 | 62 | 108 | 44 | 85 | 110 | 61 | 121 | 36 | 50 | 171 |
| Sunny days | 15 | 16 | 15 | 17 | 15 | 13 | 10 | 12 | 14 | 19 | 23 | 18 |
| Rainy days | 15 | 12 | 16 | 13 | 16 | 17 | 21 | 19 | 16 | 12 | 7 | 13 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Prince William County during the most sunny months:
The largest precipitation sum in Prince William County is at