Jeffersonville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 14.2 °C (high). Annual precipitation averages 1237 Millimeters. Jeffersonville is located in USDA Plant Hardiness Zone 6a. 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 | -10 °C | 0.1 °C | 85.85 mm |
| February | -9.3 °C | 1.8 °C | 65.79 mm |
| March | -5.1 °C | 6.3 °C | 87.63 mm |
| April | 0.8 °C | 13.9 °C | 99.82 mm |
| May | 6.7 °C | 20.3 °C | 110.74 mm |
| June | 11.9 °C | 24.7 °C | 130.81 mm |
| July | 14.5 °C | 27.3 °C | 121.41 mm |
| August | 13.6 °C | 26.2 °C | 112.52 mm |
| September | 9.7 °C | 22.5 °C | 118.36 mm |
| October | 3.4 °C | 15.8 °C | 118.62 mm |
| November | -1.7 °C | 8.9 °C | 85.34 mm |
| December | -6.1 °C | 2.7 °C | 100.08 mm |
| Annual | 2.4 °C | 14.2 °C | 1236.97 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |