| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50ag - Newaygo Barrens |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49689 - Wellston, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 13 | 21 | 32 | 42 | 51 | 56 | 54 | 47 | 37 | 29 | 19 | 34 |
| Avg Max Temp (°F) | 28 | 32 | 42 | 55 | 68 | 77 | 81 | 79 | 71 | 59 | 45 | 33 | 56 |
| Avg Precip (In.) | 2.24 | 1.51 | 2.11 | 2.68 | 2.89 | 3.24 | 3.05 | 3.8 | 3.87 | 3.41 | 2.93 | 2.35 | 34.07 |