Forestville, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39 °F (low) to 53.8 °F (high). Annual precipitation averages 33.2 Inches. Forestville 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 | 16.9 °F | 29.1 °F | 2.21 in. |
| February | 16.7 °F | 30.7 °F | 1.86 in. |
| March | 24.7 °F | 38.9 °F | 1.97 in. |
| April | 34.6 °F | 49.8 °F | 3.2 in. |
| May | 45.2 °F | 61.6 °F | 3.33 in. |
| June | 55.4 °F | 71.6 °F | 3.32 in. |
| July | 61.0 °F | 77.4 °F | 3.01 in. |
| August | 60.0 °F | 76.9 °F | 3.3 in. |
| September | 53.3 °F | 70.8 °F | 3.19 in. |
| October | 43.0 °F | 58.4 °F | 3.0 in. |
| November | 33.0 °F | 45.8 °F | 2.56 in. |
| December | 24.1 °F | 35.0 °F | 2.26 in. |
| Annual | 39 °F | 53.8 °F | 33.21 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |