Average annual temperature is 11.1 °C
Absolute maximum temperature: 33.4 °C
Absolute minimum temperature: -24.7 °C
Number of sunny days: 165 days
Number of rainy days: 189 days
Number of snow days: 11 days
Look at detailed online map of Westborough
* Weather data for Westborough 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) | 12.2 | 15.0 | 15.7 | 31.8 | 29.9 | 32.6 | 32.1 | 29.1 | 33.4 | 28.2 | 18.3 | 16.0 |
| Average daytime temperature (°C) | 5.8 | 5.8 | 8.1 | 16.5 | 21.1 | 23.9 | 28.4 | 25.7 | 22.8 | 18.6 | 9.0 | 7.8 |
| Average temperature (°C) | 2.1 | 0.6 | 3.1 | 10.1 | 14.6 | 18.2 | 23.3 | 20.7 | 18.3 | 13.7 | 4.2 | 3.4 |
| Average night temperature (°C) | -1.1 | -4.1 | -1.1 | 5.2 | 8.9 | 13.7 | 19.2 | 16.8 | 14.9 | 9.9 | 0.5 | 0.1 |
| Absolute minimum temperature (°C) | -6.8 | -24.7 | -7.9 | -2.8 | 3.3 | 6.8 | 14.0 | 12.8 | 7.8 | 2.6 | -4.7 | -6.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.9 | 12.5 | 11.1 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.0 | 6.3 | 7.6 | 8.4 | 11.5 | 9.4 | 10.8 | 9.5 | 7.3 | 7.6 | 7.0 | 5.3 |
| Precipitation (mm) | 153 | 48 | 133 | 71 | 71 | 88 | 181 | 141 | 236 | 95 | 49 | 169 |
| Sunny days | 9 | 12 | 16 | 16 | 20 | 8 | 7 | 11 | 11 | 18 | 20 | 17 |
| Rainy days | 18 | 12 | 14 | 14 | 11 | 22 | 24 | 20 | 19 | 13 | 8 | 14 |
| Snow days | 4 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
The best time to visit Westborough during the most sunny months:
The largest precipitation sum in Westborough is at