Apalachin, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.7 °C (low) to 14.3 °C (high). Annual precipitation averages 1036.3 Millimeters. Apalachin 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.3 °C | 0.1 °C | 63.5 mm |
| February | -9 °C | 1.4 °C | 54.61 mm |
| March | -5.1 °C | 6.2 °C | 77.72 mm |
| April | 0.9 °C | 13.6 °C | 90.93 mm |
| May | 7.1 °C | 20.4 °C | 86.87 mm |
| June | 12.2 °C | 25.1 °C | 109.47 mm |
| July | 14.7 °C | 27.2 °C | 97.54 mm |
| August | 13.9 °C | 26.8 °C | 104.65 mm |
| September | 10 °C | 22.8 °C | 101.35 mm |
| October | 3.9 °C | 15.8 °C | 99.57 mm |
| November | -1.2 °C | 8.7 °C | 74.68 mm |
| December | -5.4 °C | 2.9 °C | 75.44 mm |
| Annual | 2.7 °C | 14.3 °C | 1036.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |