| 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56g - Lansing Loamy Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49302 - Alto, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 16 | 25 | 35 | 46 | 55 | 60 | 58 | 50 | 39 | 30 | 21 | 37 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 56 | 69 | 78 | 82 | 80 | 72 | 59 | 45 | 34 | 57 |
| Avg Precip (In.) | 2.34 | 1.69 | 2.47 | 3.28 | 3.27 | 3.59 | 3.17 | 3.96 | 4.06 | 2.79 | 3.13 | 2.74 | 36.48 |