Average annual temperature is 10.7 °C
Absolute maximum temperature: 33.9 °C
Absolute minimum temperature: -14.5 °C
Number of sunny days: 153 days
Number of rainy days: 183 days
Number of snow days: 29 days
Look at detailed online map of Allegan County
* Weather data for Allegan 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) | 10.5 | 12.2 | 18.3 | 26.4 | 32.1 | 33.9 | 32.2 | 32.1 | 31.6 | 28.3 | 16.9 | 13.2 |
| Average daytime temperature (°C) | 3.1 | 4.1 | 7.0 | 15.3 | 21.5 | 27.0 | 27.6 | 26.2 | 23.5 | 16.0 | 9.0 | 6.5 |
| Average temperature (°C) | 0.3 | -0.3 | 2.0 | 9.0 | 15.1 | 20.4 | 22.0 | 20.7 | 18.3 | 11.9 | 4.5 | 3.6 |
| Average night temperature (°C) | -2.1 | -4.1 | -1.8 | 3.9 | 8.9 | 14.3 | 17.0 | 16.3 | 14.1 | 8.7 | 1.1 | 1.4 |
| Absolute minimum temperature (°C) | -14.5 | -14.3 | -9.5 | -4.7 | 1.7 | 8.1 | 13.0 | 10.3 | 8.6 | 0.5 | -7.9 | -2.9 |
| 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) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.9 | 12.5 | 11.1 | 9.8 | 9.1 |
| 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 | 9.0 |
| Sunshine mean duration (h) | 2.9 | 6.1 | 6.7 | 8.9 | 10.5 | 11.9 | 11.7 | 10.3 | 9.1 | 5.8 | 6.1 | 3.2 |
| Precipitation (mm) | 71 | 102 | 108 | 97 | 31 | 39 | 136 | 194 | 41 | 152 | 46 | 61 |
| Sunny days | 5 | 12 | 9 | 13 | 23 | 16 | 8 | 14 | 14 | 8 | 19 | 12 |
| Rainy days | 14 | 12 | 15 | 16 | 8 | 14 | 23 | 17 | 16 | 22 | 9 | 17 |
| Snow days | 12 | 4 | 7 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 2 |
The best time to visit Allegan County during the most sunny months:
The largest precipitation sum in Allegan County is at