Average annual temperature is 8.1 °C
Absolute maximum temperature: 32.1 °C
Absolute minimum temperature: -31.2 °C
Number of sunny days: 131 days
Number of rainy days: 189 days
Number of snow days: 45 days
Look at detailed online map of Town of Grantham
* Weather data for Town of Grantham 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) | 7.3 | 10.0 | 9.1 | 25.5 | 29.9 | 32.1 | 30.0 | 25.3 | 29.8 | 27.3 | 14.5 | 13.5 |
| Average daytime temperature (°C) | 1.4 | 1.2 | 3.8 | 12.9 | 18.6 | 21.4 | 25.5 | 22.7 | 21.1 | 15.7 | 5.4 | 4.3 |
| Average temperature (°C) | -2.2 | -4.5 | -0.8 | 7.1 | 12.3 | 16.3 | 20.9 | 18.1 | 16.4 | 11.2 | 0.9 | 0.3 |
| Average night temperature (°C) | -5.5 | -9.5 | -5.0 | 2.4 | 6.5 | 12.0 | 17.2 | 14.3 | 12.6 | 7.7 | -2.5 | -2.4 |
| Absolute minimum temperature (°C) | -14.4 | -31.2 | -10.8 | -5.2 | -0.6 | 5.7 | 11.6 | 9.4 | 5.8 | -1.6 | -9.0 | -11.0 |
| 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) | 9.4 | 10.5 | 11.9 | 13.4 | 14.7 | 15.4 | 15.1 | 13.9 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 9.0 | 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) | 3.2 | 6.1 | 6.6 | 7.6 | 11.3 | 8.3 | 10.1 | 9.9 | 8.1 | 6.1 | 6.3 | 4.3 |
| Precipitation (mm) | 109 | 47 | 92 | 79 | 75 | 162 | 226 | 147 | 82 | 105 | 51 | 146 |
| Sunny days | 7 | 11 | 10 | 14 | 19 | 4 | 3 | 8 | 15 | 13 | 14 | 13 |
| Rainy days | 11 | 7 | 10 | 16 | 12 | 26 | 28 | 23 | 15 | 18 | 9 | 14 |
| Snow days | 13 | 10 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 |
The best time to visit Town of Grantham during the most sunny months:
Months with the longest average daylight duration in Town of Grantham:
The largest precipitation sum in Town of Grantham is at