Forestville, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 11.8 °C (high). Annual precipitation averages 796.1 Millimeters. Forestville is located in USDA Plant Hardiness Zone 5b. 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 | -12.1 °C | -3.7 °C | 39.12 mm |
| February | -11.3 °C | -2 °C | 27.18 mm |
| March | -6.1 °C | 3.8 °C | 42.42 mm |
| April | 0.2 °C | 10.3 °C | 76.71 mm |
| May | 6.6 °C | 17.6 °C | 83.57 mm |
| June | 12.1 °C | 23.2 °C | 90.93 mm |
| July | 14.8 °C | 26.1 °C | 94.23 mm |
| August | 14.3 °C | 25.3 °C | 88.14 mm |
| September | 10.1 °C | 21.1 °C | 80.01 mm |
| October | 3.8 °C | 13.6 °C | 76.71 mm |
| November | -1.9 °C | 6.2 °C | 54.1 mm |
| December | -7.9 °C | -0.5 °C | 42.93 mm |
| Annual | 1.9 °C | 11.8 °C | 796.05 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |