| 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 6a: -10F to -5F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| 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 48746 - Millington, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 15 | 24 | 34 | 45 | 54 | 59 | 57 | 50 | 39 | 31 | 20 | 37 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 57 | 70 | 79 | 83 | 80 | 73 | 60 | 46 | 34 | 57 |
| Avg Precip (In.) | 1.76 | 1.42 | 2.32 | 2.77 | 2.89 | 3.1 | 2.97 | 3.21 | 3.92 | 2.54 | 2.7 | 2.11 | 31.71 |