Average annual temperature is 12.3 °C
Absolute maximum temperature: 34.9 °C
Absolute minimum temperature: -15.5 °C
Number of sunny days: 177 days
Number of rainy days: 179 days
Number of snow days: 9 days
Look at detailed online map of Cornish
* Weather data for Cornish 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) | 17.4 | 17.4 | 15.9 | 31.0 | 29.5 | 34.8 | 33.3 | 30.6 | 34.9 | 27.8 | 19.4 | 15.4 |
| Average daytime temperature (°C) | 7.7 | 8.4 | 9.9 | 18.8 | 22.6 | 26.1 | 29.8 | 27.4 | 24.1 | 19.0 | 10.5 | 8.4 |
| Average temperature (°C) | 3.9 | 2.8 | 4.3 | 12.2 | 15.4 | 19.7 | 24.0 | 22.0 | 19.0 | 13.8 | 5.4 | 4.2 |
| Average night temperature (°C) | 0.4 | -1.8 | -0.4 | 6.8 | 8.4 | 14.2 | 19.1 | 17.5 | 14.8 | 9.5 | 1.2 | 1.0 |
| Absolute minimum temperature (°C) | -4.7 | -15.5 | -7.4 | -2.1 | 3.2 | 8.5 | 14.2 | 13.3 | 8.4 | 3.9 | -4.9 | -5.4 |
| 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 | 10.6 | 11.9 | 13.3 | 14.5 | 15.0 | 14.8 | 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) | 4.5 | 6.7 | 7.2 | 8.6 | 11.6 | 10.3 | 11.6 | 9.7 | 8.1 | 7.9 | 7.3 | 4.3 |
| Precipitation (mm) | 126 | 41 | 71 | 107 | 36 | 101 | 133 | 90 | 119 | 47 | 70 | 186 |
| Sunny days | 13 | 15 | 14 | 15 | 21 | 13 | 10 | 11 | 14 | 17 | 19 | 15 |
| Rainy days | 16 | 9 | 17 | 15 | 10 | 17 | 21 | 20 | 16 | 14 | 10 | 14 |
| Snow days | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Cornish during the most sunny months:
The largest precipitation sum in Cornish is at