| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 56g - Lansing Loamy Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48846 - Ionia, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 15 | 24 | 35 | 46 | 55 | 59 | 58 | 50 | 39 | 30 | 20 | 37 |
| Avg Max Temp (°F) | 28 | 32 | 42 | 56 | 69 | 78 | 82 | 80 | 72 | 59 | 45 | 33 | 56 |
| Avg Precip (In.) | 2 | 1.69 | 2.58 | 3.2 | 3.27 | 3.55 | 2.94 | 4.16 | 3.85 | 2.89 | 2.91 | 2.53 | 35.57 |