| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56h - Interlobate Dead Ice Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48353 - Hartland, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 16 | 25 | 35 | 47 | 56 | 60 | 59 | 51 | 40 | 31 | 20 | 38 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 56 | 68 | 77 | 81 | 79 | 71 | 59 | 46 | 34 | 56 |
| Avg Precip (In.) | 1.64 | 1.54 | 2.22 | 2.92 | 2.81 | 3.24 | 2.7 | 3.25 | 3.28 | 2.27 | 2.55 | 2.19 | 30.62 |