Gainesville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 12.2 °C (high). Annual precipitation averages 1118.6 Millimeters. Gainesville 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | -1.7 °C | 77.98 mm |
| February | -9.6 °C | -0.5 °C | 60.96 mm |
| March | -5.9 °C | 3.8 °C | 77.72 mm |
| April | 0.2 °C | 11.2 °C | 88.39 mm |
| May | 6.8 °C | 18.4 °C | 98.04 mm |
| June | 12.2 °C | 22.9 °C | 110.74 mm |
| July | 14.6 °C | 25.1 °C | 112.78 mm |
| August | 13.3 °C | 24.6 °C | 106.43 mm |
| September | 9.6 °C | 21 °C | 100.33 mm |
| October | 4.1 °C | 13.9 °C | 109.47 mm |
| November | -1.4 °C | 6.9 °C | 90.17 mm |
| December | -6.5 °C | 1.2 °C | 85.6 mm |
| Annual | 2.3 °C | 12.2 °C | 1118.61 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |