Average annual temperature is 11.3 °C
Absolute maximum temperature: 36.8 °C
Absolute minimum temperature: -24.4 °C
Number of sunny days: 203 days
Number of rainy days: 142 days
Number of snow days: 20 days
Look at detailed online map of Grinnell
* Weather data for Grinnell 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) | 12.2 | 12.1 | 22.4 | 26.6 | 30.5 | 31.5 | 33.7 | 36.8 | 34.0 | 31.0 | 17.7 | 13.9 |
| Average daytime temperature (°C) | 0.9 | 4.4 | 7.7 | 16.9 | 24.4 | 28.2 | 28.2 | 28.3 | 26.2 | 17.5 | 10.1 | 6.3 |
| Average temperature (°C) | -3.3 | -1.7 | 2.0 | 10.1 | 17.9 | 22.5 | 23.1 | 23.4 | 20.4 | 12.9 | 5.1 | 2.2 |
| Average night temperature (°C) | -6.3 | -6.2 | -2.3 | 4.8 | 11.9 | 17.1 | 18.2 | 18.9 | 15.6 | 8.9 | 1.0 | -0.7 |
| Absolute minimum temperature (°C) | -24.4 | -23.4 | -14.5 | -4.1 | 2.6 | 8.5 | 12.9 | 13.4 | 10.3 | -4.2 | -12.5 | -7.0 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.3 | 14.5 | 15.2 | 14.9 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.8 | 7.1 | 7.1 | 9.6 | 11.5 | 12.1 | 12.3 | 11.2 | 10.4 | 7.3 | 7.3 | 4.6 |
| Precipitation (mm) | 47 | 62 | 54 | 60 | 49 | 51 | 60 | 50 | 32 | 157 | 19 | 58 |
| Sunny days | 18 | 17 | 15 | 14 | 22 | 14 | 18 | 17 | 13 | 17 | 22 | 16 |
| Rainy days | 8 | 8 | 13 | 14 | 9 | 16 | 13 | 14 | 17 | 13 | 6 | 11 |
| Snow days | 5 | 3 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 4 |
The best time to visit Grinnell during the most sunny months:
The largest precipitation sum in Grinnell is at