| 2023 Hardiness Zone: | Zone 6a: -10°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 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| 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 49401 - Allendale, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 26 | 35 | 46 | 55 | 60 | 58 | 51 | 40 | 32 | 22 | 38 |
| Avg Max Temp (°F) | 30 | 33 | 43 | 55 | 68 | 77 | 81 | 79 | 72 | 60 | 46 | 35 | 57 |
| Avg Precip (In.) | 2.28 | 1.53 | 2.42 | 3.22 | 3.26 | 3.45 | 3.16 | 3.87 | 3.91 | 2.94 | 3.29 | 2.79 | 36.14 |