Average annual temperature is 15.4 °C
Absolute maximum temperature: 42.7 °C
Absolute minimum temperature: -14.4 °C
Number of sunny days: 271 days
Number of rainy days: 87 days
Number of snow days: 7 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) | 11.5 | 13.6 | 16.4 | 31.5 | 31.6 | 33.7 | 42.7 | 39.8 | 35.7 | 30.8 | 24.7 | 17.7 |
| Average daytime temperature (°C) | 6.6 | 8.6 | 10.6 | 21.6 | 27.8 | 31.0 | 38.9 | 34.2 | 30.9 | 25.1 | 16.6 | 12.3 |
| Average temperature (°C) | 2.5 | 2.7 | 5.3 | 13.2 | 20.7 | 24.1 | 31.9 | 27.4 | 23.2 | 17.0 | 9.7 | 5.9 |
| Average night temperature (°C) | -0.6 | -2.1 | 1.1 | 5.7 | 12.8 | 16.0 | 22.7 | 20.2 | 15.7 | 9.2 | 3.8 | 0.9 |
| Absolute minimum temperature (°C) | -5.7 | -14.4 | -4.4 | -4.2 | 6.0 | 13.3 | 17.7 | 18.1 | 9.4 | 0.3 | -2.3 | -3.8 |
| 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 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.4 | 13.6 | 12.4 | 11.2 | 10.2 | 9.7 |
| 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) | 5.8 | 8.3 | 8.1 | 11.9 | 12.6 | 12.8 | 13.1 | 11.3 | 10.8 | 10.3 | 8.8 | 8.2 |
| Precipitation (mm) | 129 | 54 | 170 | 4 | 10 | 7 | 1 | 36 | 19 | 15 | 29 | 13 |
| Sunny days | 16 | 17 | 12 | 25 | 22 | 25 | 30 | 21 | 22 | 29 | 25 | 27 |
| Rainy days | 13 | 7 | 18 | 5 | 9 | 5 | 1 | 10 | 8 | 2 | 5 | 4 |
| Snow days | 2 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Grafton during the most sunny months:
The largest precipitation sum in Grafton is at