| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°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: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 57a - Maumee Lake Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48045 - Harrison Township, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 19 | 27 | 37 | 47 | 57 | 62 | 61 | 53 | 43 | 33 | 24 | 40 |
| Avg Max Temp (°F) | 31 | 33 | 43 | 55 | 68 | 77 | 81 | 79 | 72 | 60 | 47 | 36 | 57 |
| Avg Precip (In.) | 1.88 | 1.82 | 2.35 | 2.98 | 2.86 | 3.14 | 3.44 | 3.19 | 3.26 | 2.22 | 2.65 | 2.54 | 32.32 |