Jacksonville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 13.8 °C (high). Annual precipitation averages 971.3 Millimeters. Jacksonville 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.2 °C | -0.3 °C | 57.66 mm |
| February | -8.4 °C | 1 °C | 49.78 mm |
| March | -4.7 °C | 5.4 °C | 70.36 mm |
| April | 1.4 °C | 13 °C | 84.07 mm |
| May | 7.7 °C | 20.1 °C | 81.28 mm |
| June | 12.7 °C | 24.5 °C | 101.09 mm |
| July | 15.2 °C | 26.9 °C | 100.84 mm |
| August | 14.4 °C | 26.3 °C | 95.25 mm |
| September | 10.5 °C | 22.4 °C | 98.3 mm |
| October | 4.9 °C | 15.4 °C | 92.96 mm |
| November | -0.2 °C | 8.6 °C | 73.15 mm |
| December | -5.1 °C | 2.6 °C | 66.55 mm |
| Annual | 3.3 °C | 13.8 °C | 971.29 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |