Fonda, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 14.2 °C (high). Annual precipitation averages 1085.6 Millimeters. Fonda is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | -0.6 °C | 80.52 mm |
| February | -8.9 °C | 1 °C | 64.52 mm |
| March | -4.4 °C | 5.7 °C | 83.82 mm |
| April | 2.1 °C | 13.6 °C | 88.39 mm |
| May | 8.6 °C | 20.8 °C | 89.66 mm |
| June | 13.7 °C | 25.3 °C | 114.81 mm |
| July | 16.5 °C | 27.8 °C | 109.47 mm |
| August | 15.5 °C | 27.1 °C | 99.82 mm |
| September | 11.4 °C | 23 °C | 89.92 mm |
| October | 4.9 °C | 16.2 °C | 99.31 mm |
| November | -0.6 °C | 8.5 °C | 82.55 mm |
| December | -5.6 °C | 2.3 °C | 82.8 mm |
| Annual | 3.6 °C | 14.2 °C | 1085.59 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |