| 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 55a - Clayey High Lime Till Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49221 - Adrian, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 26 | 36 | 46 | 55 | 60 | 58 | 50 | 39 | 30 | 21 | 38 |
| Avg Max Temp (°F) | 32 | 35 | 46 | 59 | 71 | 80 | 84 | 82 | 74 | 62 | 48 | 36 | 59 |
| Avg Precip (In.) | 1.9 | 1.81 | 2.63 | 3.3 | 3.38 | 3.73 | 3.12 | 3.72 | 3.46 | 2.51 | 2.87 | 2.64 | 35.07 |