| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51m - Manistee-Leelanau Shore |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49635 - Frankfort, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 17 | 24 | 34 | 44 | 53 | 59 | 59 | 52 | 42 | 32 | 22 | 38 |
| Avg Max Temp (°F) | 28 | 31 | 40 | 51 | 64 | 73 | 77 | 76 | 68 | 57 | 44 | 33 | 54 |
| Avg Precip (In.) | 2.75 | 1.95 | 2.31 | 2.58 | 2.64 | 3.22 | 3.02 | 3.46 | 4.09 | 3.26 | 2.97 | 2.77 | 35.03 |