Forestville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.6 °C (low) to 14 °C (high). Annual precipitation averages 1168.4 Millimeters. Forestville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 0.3 °C | 89.92 mm |
| February | -7.4 °C | 1.4 °C | 65.53 mm |
| March | -3.7 °C | 5.9 °C | 78.23 mm |
| April | 2.2 °C | 13.1 °C | 94.49 mm |
| May | 8.7 °C | 19.4 °C | 93.22 mm |
| June | 14 °C | 24.5 °C | 97.03 mm |
| July | 16.6 °C | 26.6 °C | 106.17 mm |
| August | 15.9 °C | 25.9 °C | 100.84 mm |
| September | 12.3 °C | 22.7 °C | 112.78 mm |
| October | 6.3 °C | 16.2 °C | 117.6 mm |
| November | 1.1 °C | 8.9 °C | 107.7 mm |
| December | -3.7 °C | 3.2 °C | 104.9 mm |
| Annual | 4.6 °C | 14 °C | 1168.41 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |