| 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 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 57e - Saginaw Lake Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48655 - Saint Charles, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 14 | 23 | 35 | 46 | 54 | 59 | 56 | 49 | 38 | 29 | 20 | 36 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 57 | 70 | 79 | 83 | 81 | 73 | 61 | 46 | 34 | 57 |
| Avg Precip (In.) | 1.77 | 1.37 | 2.28 | 2.8 | 2.8 | 3.27 | 2.73 | 3.72 | 3.38 | 2.67 | 2.7 | 1.98 | 31.47 |