Cassopolis, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 58 °F (high). Annual precipitation averages 40.1 Inches. Cassopolis is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.3 °F | 31.0 °F | 2.86 in. |
| February | 19.4 °F | 34.0 °F | 2.23 in. |
| March | 27.1 °F | 44.7 °F | 2.36 in. |
| April | 38.1 °F | 57.3 °F | 3.52 in. |
| May | 49.6 °F | 68.9 °F | 4.14 in. |
| June | 58.9 °F | 78.2 °F | 4.12 in. |
| July | 62.5 °F | 82.1 °F | 3.94 in. |
| August | 60.9 °F | 80.5 °F | 4.17 in. |
| September | 53.3 °F | 74.4 °F | 3.42 in. |
| October | 42.0 °F | 61.2 °F | 3.86 in. |
| November | 32.4 °F | 47.3 °F | 2.93 in. |
| December | 23.5 °F | 36.0 °F | 2.53 in. |
| Annual | 40.4 °F | 58 °F | 40.08 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |