Average annual temperature is 12.7 °C
Absolute maximum temperature: 34.5 °C
Absolute minimum temperature: -11.1 °C
Number of sunny days: 178 days
Number of rainy days: 181 days
Number of snow days: 6 days
Look at detailed online map of Borough of Cornwall
* Weather data for Borough of Cornwall 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) | 16.7 | 18.9 | 19.5 | 30.1 | 30.3 | 34.5 | 34.0 | 30.8 | 33.3 | 27.2 | 21.2 | 15.9 |
| Average daytime temperature (°C) | 7.9 | 9.5 | 10.6 | 19.5 | 22.7 | 26.3 | 29.7 | 27.7 | 23.8 | 18.9 | 11.0 | 8.4 |
| Average temperature (°C) | 4.2 | 4.0 | 4.9 | 13.1 | 15.9 | 20.1 | 24.2 | 22.6 | 19.1 | 13.8 | 5.8 | 4.4 |
| Average night temperature (°C) | 1.4 | -0.4 | 0.3 | 7.7 | 9.5 | 14.7 | 19.5 | 18.2 | 15.0 | 9.6 | 1.6 | 1.2 |
| Absolute minimum temperature (°C) | -4.6 | -11.1 | -6.3 | 0.3 | 2.7 | 9.9 | 16.2 | 14.6 | 9.5 | 2.6 | -5.9 | -4.7 |
| 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 | 14.0 | 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) | 4.8 | 6.8 | 7.3 | 9.1 | 11.5 | 10.8 | 12.1 | 10.6 | 8.0 | 8.2 | 7.7 | 4.3 |
| Precipitation (mm) | 88 | 38 | 66 | 139 | 18 | 110 | 112 | 120 | 119 | 67 | 74 | 143 |
| Sunny days | 11 | 16 | 12 | 15 | 22 | 12 | 7 | 13 | 17 | 21 | 20 | 12 |
| Rainy days | 20 | 10 | 18 | 15 | 9 | 18 | 24 | 18 | 13 | 10 | 9 | 17 |
| Snow days | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Borough of Cornwall during the most sunny months:
The largest precipitation sum in Borough of Cornwall is at