Average annual temperature is 10.9 °C
Absolute maximum temperature: 32.5 °C
Absolute minimum temperature: -20.3 °C
Number of sunny days: 159 days
Number of rainy days: 187 days
Number of snow days: 19 days
Look at detailed online map of Grafton
* Weather data for Grafton 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) | 14.7 | 16.5 | 17.9 | 27.4 | 30.0 | 32.4 | 31.7 | 30.8 | 32.5 | 28.7 | 17.2 | 16.9 |
| Average daytime temperature (°C) | 4.0 | 6.6 | 7.8 | 15.8 | 21.5 | 26.6 | 28.3 | 26.6 | 23.7 | 16.8 | 9.9 | 7.6 |
| Average temperature (°C) | 0.5 | 0.3 | 2.7 | 9.4 | 14.4 | 20.1 | 22.7 | 20.8 | 18.6 | 12.4 | 4.7 | 4.0 |
| Average night temperature (°C) | -2.6 | -4.3 | -1.3 | 3.8 | 7.9 | 13.8 | 17.3 | 15.9 | 14.1 | 8.8 | 0.5 | 1.3 |
| Absolute minimum temperature (°C) | -20.1 | -20.3 | -7.3 | -4.3 | 1.0 | 8.2 | 13.1 | 8.2 | 7.7 | -3.5 | -7.5 | -4.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 13.0 | 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 | 13.8 | 12.5 | 11.1 | 9.8 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.0 | 7.5 | 6.7 | 8.7 | 10.9 | 11.6 | 11.7 | 10.6 | 8.9 | 6.0 | 6.6 | 3.6 |
| Precipitation (mm) | 81 | 101 | 102 | 115 | 31 | 39 | 121 | 113 | 46 | 78 | 34 | 54 |
| Sunny days | 8 | 14 | 10 | 12 | 21 | 15 | 7 | 15 | 15 | 12 | 20 | 10 |
| Rainy days | 15 | 11 | 16 | 18 | 10 | 15 | 24 | 16 | 15 | 19 | 8 | 20 |
| Snow days | 8 | 3 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 |
The best time to visit Grafton during the most sunny months:
The largest precipitation sum in Grafton is at