| 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. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 56g - Lansing Loamy Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48855 - Howell, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 16 | 25 | 35 | 46 | 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.) | 1.65 | 1.5 | 2.25 | 2.94 | 2.76 | 3.27 | 2.81 | 3.34 | 3.45 | 2.4 | 2.63 | 2.15 | 31.18 |