| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| 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 48225 - Harper Woods, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 28 | 38 | 49 | 59 | 64 | 63 | 56 | 45 | 35 | 25 | 42 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 57 | 70 | 79 | 83 | 81 | 74 | 62 | 49 | 37 | 58 |
| Avg Precip (In.) | 1.8 | 1.82 | 2.45 | 3.2 | 2.93 | 3.33 | 3.38 | 3.5 | 3.39 | 2.53 | 2.78 | 2.46 | 33.56 |