Casnovia, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.3 °F (low) to 55.9 °F (high). Annual precipitation averages 37.6 Inches. Casnovia 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.9 °F | 29.0 °F | 2.46 in. |
| February | 15.8 °F | 31.8 °F | 1.92 in. |
| March | 23.1 °F | 41.9 °F | 2.41 in. |
| April | 34.4 °F | 54.9 °F | 3.75 in. |
| May | 45.5 °F | 66.9 °F | 4.13 in. |
| June | 54.8 °F | 76.5 °F | 3.72 in. |
| July | 59.1 °F | 80.4 °F | 3.15 in. |
| August | 57.5 °F | 79.0 °F | 3.29 in. |
| September | 49.9 °F | 72.1 °F | 3.19 in. |
| October | 39.0 °F | 58.7 °F | 3.76 in. |
| November | 30.2 °F | 45.1 °F | 3.31 in. |
| December | 22.2 °F | 34.0 °F | 2.46 in. |
| Annual | 37.3 °F | 55.9 °F | 37.55 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |