Average annual temperature is 17.7 °C
Absolute maximum temperature: 35.8 °C
Absolute minimum temperature: -3.7 °C
Number of sunny days: 173 days
Number of rainy days: 192 days
Look at detailed online map of Granthams
* Weather data for Granthams 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) | 23.4 | 27.2 | 27.9 | 29.4 | 29.7 | 31.5 | 34.6 | 35.8 | 34.7 | 28.8 | 26.1 | 22.9 |
| Average daytime temperature (°C) | 15.7 | 18.0 | 18.4 | 23.1 | 24.0 | 28.2 | 32.1 | 31.9 | 28.4 | 23.5 | 17.9 | 15.6 |
| Average temperature (°C) | 10.6 | 12.6 | 13.2 | 17.6 | 19.2 | 23.1 | 26.7 | 26.4 | 23.0 | 17.7 | 12.3 | 9.9 |
| Average night temperature (°C) | 6.5 | 8.5 | 8.9 | 13.3 | 15.2 | 18.9 | 22.8 | 22.5 | 19.0 | 13.3 | 8.4 | 5.9 |
| Absolute minimum temperature (°C) | -0.3 | -3.7 | -0.1 | 6.0 | 9.5 | 12.9 | 20.7 | 17.9 | 14.0 | 7.9 | -2.6 | -1.1 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.2 | 13.4 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.9 | 7.0 | 8.1 | 9.6 | 10.1 | 11.1 | 10.9 | 10.4 | 9.4 | 9.1 | 7.6 | 6.9 |
| Precipitation (mm) | 101 | 91 | 72 | 122 | 114 | 87 | 120 | 205 | 140 | 38 | 53 | 190 |
| Sunny days | 19 | 13 | 17 | 14 | 10 | 6 | 2 | 9 | 20 | 23 | 18 | 22 |
| Rainy days | 12 | 15 | 14 | 16 | 21 | 24 | 29 | 22 | 10 | 8 | 12 | 9 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Granthams is at