| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 56d - Michigan Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49408 - Fennville, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 18 | 26 | 36 | 46 | 55 | 60 | 59 | 51 | 41 | 32 | 22 | 39 |
| Avg Max Temp (°F) | 30 | 34 | 44 | 56 | 68 | 77 | 81 | 79 | 72 | 60 | 47 | 35 | 57 |
| Avg Precip (In.) | 2.4 | 1.6 | 2.39 | 3.38 | 3.38 | 3.61 | 3.5 | 3.76 | 4.12 | 2.99 | 3.41 | 3.03 | 37.57 |