| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 57e - Saginaw Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48059 - Fort Gratiot, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 25 | 36 | 47 | 56 | 62 | 61 | 53 | 42 | 32 | 22 | 39 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 54 | 67 | 76 | 81 | 80 | 73 | 60 | 47 | 35 | 57 |
| Avg Precip (In.) | 1.8 | 1.59 | 2.22 | 2.97 | 2.73 | 3.2 | 2.9 | 3.05 | 3.46 | 2.44 | 2.79 | 2.16 | 31.31 |