| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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 48439 - Grand Blanc, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 16 | 25 | 35 | 46 | 55 | 60 | 58 | 50 | 39 | 31 | 20 | 37 |
| Avg Max Temp (°F) | 29 | 33 | 43 | 56 | 69 | 78 | 82 | 79 | 72 | 60 | 46 | 34 | 57 |
| Avg Precip (In.) | 1.6 | 1.38 | 2.19 | 3.01 | 2.78 | 3.17 | 2.98 | 3.41 | 3.63 | 2.41 | 2.66 | 2.13 | 31.37 |