Average annual temperature is 10.8 °C
Absolute maximum temperature: 32.4 °C
Absolute minimum temperature: -13.3 °C
Number of sunny days: 159 days
Number of rainy days: 193 days
Number of snow days: 13 days
Look at detailed online map of Borough of Williamstown
* Weather data for Borough of Williamstown 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) | 15.2 | 16.5 | 17.6 | 28.1 | 29.3 | 32.4 | 32.4 | 29.1 | 31.3 | 25.9 | 18.5 | 13.6 |
| Average daytime temperature (°C) | 5.7 | 7.5 | 8.3 | 17.3 | 20.4 | 24.0 | 27.9 | 25.8 | 22.1 | 16.8 | 8.8 | 6.3 |
| Average temperature (°C) | 2.2 | 1.8 | 2.8 | 11.0 | 13.7 | 18.1 | 22.3 | 20.6 | 17.3 | 12.2 | 4.0 | 2.7 |
| Average night temperature (°C) | -0.4 | -2.6 | -1.7 | 5.8 | 7.3 | 13.0 | 17.7 | 16.2 | 13.1 | 8.4 | 0.3 | -0.2 |
| Absolute minimum temperature (°C) | -6.8 | -13.3 | -8.4 | -2.5 | 1.1 | 7.2 | 13.5 | 11.9 | 7.7 | 0.1 | -7.6 | -5.7 |
| 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) | 9.6 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 4.4 | 6.6 | 7.3 | 8.9 | 11.5 | 10.9 | 12.1 | 10.6 | 8.7 | 7.7 | 7.4 | 4.2 |
| Precipitation (mm) | 100 | 37 | 72 | 113 | 18 | 98 | 115 | 111 | 109 | 69 | 56 | 115 |
| Sunny days | 10 | 14 | 10 | 16 | 17 | 11 | 6 | 9 | 17 | 16 | 20 | 13 |
| Rainy days | 18 | 10 | 18 | 14 | 14 | 19 | 25 | 22 | 13 | 15 | 9 | 16 |
| Snow days | 3 | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Borough of Williamstown during the most sunny months:
The largest precipitation sum in Borough of Williamstown is at