Average annual temperature is 10.2 °C
Absolute maximum temperature: 32.8 °C
Absolute minimum temperature: -22.2 °C
Number of sunny days: 165 days
Number of rainy days: 173 days
Number of snow days: 27 days
Look at detailed online map of Ionia County
* Weather data for Ionia 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) | 8.8 | 11.9 | 17.1 | 26.3 | 31.9 | 32.8 | 32.5 | 31.8 | 31.3 | 28.4 | 16.5 | 13.4 |
| Average daytime temperature (°C) | 2.4 | 3.9 | 6.6 | 15.5 | 22.1 | 27.6 | 27.4 | 25.6 | 22.8 | 15.7 | 8.4 | 6.1 |
| Average temperature (°C) | -0.7 | -1.2 | 1.5 | 8.9 | 14.8 | 20.6 | 21.9 | 20.0 | 17.7 | 11.3 | 3.7 | 3.0 |
| Average night temperature (°C) | -3.2 | -5.5 | -2.5 | 3.5 | 7.9 | 13.8 | 16.7 | 15.2 | 13.2 | 7.8 | 0.0 | 0.8 |
| Absolute minimum temperature (°C) | -22.2 | -18.2 | -10.6 | -5.6 | 0.9 | 8.0 | 12.3 | 7.7 | 6.7 | -0.5 | -8.1 | -5.9 |
| 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) | 9.4 | 10.5 | 11.9 | 13.4 | 14.6 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 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) | 3.0 | 6.5 | 6.3 | 9.0 | 10.4 | 11.7 | 11.8 | 10.4 | 7.8 | 6.0 | 6.4 | 3.3 |
| Precipitation (mm) | 60 | 93 | 99 | 95 | 17 | 48 | 150 | 173 | 43 | 118 | 61 | 56 |
| Sunny days | 7 | 14 | 12 | 13 | 22 | 16 | 11 | 14 | 16 | 8 | 18 | 14 |
| Rainy days | 13 | 10 | 13 | 16 | 9 | 14 | 20 | 17 | 14 | 22 | 9 | 16 |
| Snow days | 11 | 4 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 1 |
The best time to visit Ionia County during the most sunny months:
Months with the longest average daylight duration in Ionia County:
The largest precipitation sum in Ionia County is at