| 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. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56h - Interlobate Dead Ice Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49031 - Cassopolis, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 27 | 37 | 47 | 57 | 61 | 59 | 51 | 40 | 31 | 21 | 39 |
| Avg Max Temp (°F) | 31 | 35 | 46 | 58 | 70 | 79 | 83 | 81 | 74 | 62 | 47 | 35 | 58 |
| Avg Precip (In.) | 2.35 | 1.89 | 2.67 | 3.49 | 3.65 | 3.82 | 3.64 | 3.82 | 3.91 | 3.29 | 3.32 | 2.99 | 38.82 |