Average annual temperature is 12.6 °C
Absolute maximum temperature: 32.1 °C
Absolute minimum temperature: -11.0 °C
Number of sunny days: 147 days
Number of rainy days: 209 days
Number of snow days: 9 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) | 19.8 | 21.4 | 23.0 | 28.5 | 28.0 | 32.1 | 31.9 | 30.6 | 30.8 | 27.0 | 20.4 | 18.7 |
| Average daytime temperature (°C) | 9.4 | 12.2 | 12.2 | 19.5 | 21.5 | 25.2 | 28.4 | 26.9 | 23.7 | 18.7 | 12.5 | 9.9 |
| Average temperature (°C) | 4.4 | 5.9 | 6.0 | 12.6 | 15.3 | 19.1 | 22.9 | 21.5 | 18.4 | 13.5 | 6.7 | 5.1 |
| Average night temperature (°C) | 1.1 | 1.2 | 1.2 | 6.9 | 9.8 | 13.7 | 18.5 | 17.2 | 14.3 | 9.5 | 2.4 | 1.7 |
| Absolute minimum temperature (°C) | -6.1 | -11.0 | -8.6 | -0.1 | 2.4 | 8.2 | 14.4 | 11.7 | 8.3 | 1.6 | -7.2 | -5.2 |
| 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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.5 | 11.2 | 10.0 | 9.5 |
| 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) | 3.3 | 6.5 | 6.8 | 8.7 | 10.1 | 11.0 | 11.5 | 10.6 | 9.0 | 7.3 | 6.9 | 4.7 |
| Precipitation (mm) | 120 | 91 | 93 | 58 | 100 | 124 | 137 | 185 | 95 | 76 | 48 | 80 |
| Sunny days | 8 | 12 | 11 | 14 | 16 | 11 | 7 | 8 | 13 | 15 | 20 | 12 |
| Rainy days | 20 | 14 | 18 | 16 | 15 | 19 | 24 | 23 | 17 | 16 | 9 | 18 |
| Snow days | 3 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Grafton during the most sunny months:
The largest precipitation sum in Grafton is at