| 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 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 56b - Elkhart Till Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49080 - Plainwell, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 26 | 35 | 46 | 55 | 59 | 58 | 50 | 40 | 31 | 21 | 38 |
| Avg Max Temp (°F) | 30 | 34 | 45 | 58 | 70 | 79 | 83 | 81 | 73 | 61 | 47 | 35 | 58 |
| Avg Precip (In.) | 2.36 | 1.72 | 2.55 | 3.49 | 3.5 | 3.8 | 3.59 | 3.86 | 4.08 | 3 | 3.32 | 2.9 | 38.16 |