Average annual temperature is 6.3 °C
Absolute maximum temperature: 29.6 °C
Absolute minimum temperature: -34.2 °C
Number of sunny days: 122 days
Number of rainy days: 198 days
Number of snow days: 45 days
Look at detailed online map of Grafton County
* Weather data for Grafton County 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) | 5.9 | 6.1 | 5.7 | 23.6 | 27.7 | 29.6 | 27.6 | 23.2 | 27.5 | 24.7 | 11.9 | 10.8 |
| Average daytime temperature (°C) | -0.5 | -1.9 | 1.6 | 10.6 | 16.6 | 19.4 | 23.3 | 20.2 | 19.4 | 13.4 | 3.2 | 2.1 |
| Average temperature (°C) | -3.8 | -7.4 | -2.4 | 4.9 | 10.5 | 14.7 | 19.2 | 16.2 | 15.1 | 9.5 | -1.0 | -1.5 |
| Average night temperature (°C) | -7.0 | -12.7 | -6.1 | 0.6 | 5.0 | 10.7 | 15.8 | 12.9 | 11.6 | 6.2 | -4.3 | -4.2 |
| Absolute minimum temperature (°C) | -16.7 | -34.2 | -12.0 | -14.6 | -2.3 | 3.4 | 10.1 | 8.8 | 5.3 | -3.3 | -11.1 | -13.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.3 | 10.5 | 11.9 | 13.5 | 14.7 | 15.4 | 15.1 | 14.0 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 3.0 | 5.9 | 6.3 | 7.5 | 11.0 | 8.2 | 10.2 | 9.6 | 8.3 | 5.6 | 6.2 | 3.8 |
| Precipitation (mm) | 128 | 56 | 87 | 107 | 94 | 192 | 297 | 185 | 88 | 109 | 69 | 166 |
| Sunny days | 6 | 10 | 11 | 13 | 17 | 3 | 2 | 7 | 15 | 10 | 16 | 12 |
| Rainy days | 15 | 6 | 6 | 16 | 14 | 27 | 29 | 24 | 15 | 21 | 10 | 15 |
| Snow days | 10 | 12 | 14 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 4 |
The best time to visit Grafton County during the most sunny months:
Months with the longest average daylight duration in Grafton County:
The largest precipitation sum in Grafton County is at