| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50ae - Mio Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48647 - Mio, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 7 | 17 | 30 | 40 | 50 | 54 | 52 | 45 | 35 | 26 | 15 | 32 |
| Avg Max Temp (°F) | 27 | 30 | 40 | 53 | 67 | 77 | 81 | 78 | 69 | 57 | 43 | 31 | 55 |
| Avg Precip (In.) | 1.66 | 1.22 | 1.77 | 2.12 | 2.41 | 2.64 | 3.01 | 3.56 | 2.96 | 2.29 | 1.97 | 1.67 | 27.3 |