| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| 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 48661 - West Branch, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 8 | 18 | 30 | 41 | 50 | 55 | 53 | 45 | 34 | 25 | 15 | 32 |
| Avg Max Temp (°F) | 27 | 30 | 41 | 54 | 68 | 77 | 81 | 78 | 70 | 58 | 43 | 31 | 55 |
| Avg Precip (In.) | 1.71 | 1.25 | 2.01 | 2.44 | 2.96 | 3.09 | 3.03 | 3.81 | 3.53 | 2.54 | 2.4 | 1.89 | 30.66 |