| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50aa - Menominee-Drummond Lakeshore |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49757 - Mackinac Island, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 11 | 19 | 31 | 42 | 52 | 59 | 58 | 50 | 39 | 30 | 19 | 35 |
| Avg Max Temp (°F) | 25 | 27 | 35 | 46 | 59 | 69 | 76 | 74 | 65 | 53 | 41 | 31 | 50 |
| Avg Precip (In.) | 1.79 | 1.24 | 1.92 | 2.34 | 2.53 | 2.55 | 2.84 | 3.21 | 3.57 | 2.86 | 2.43 | 2.06 | 29.33 |