| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| 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 48708 - Bay City, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 15 | 24 | 35 | 47 | 56 | 60 | 59 | 51 | 41 | 31 | 21 | 38 |
| Avg Max Temp (°F) | 28 | 31 | 41 | 54 | 68 | 77 | 82 | 79 | 71 | 60 | 45 | 34 | 56 |
| Avg Precip (In.) | 1.66 | 1.27 | 2.09 | 2.96 | 3.04 | 3.07 | 2.36 | 3.36 | 4.26 | 2.63 | 2.65 | 1.8 | 31.15 |