Afton, 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 14.4 °C (high). Annual precipitation averages 1134.9 Millimeters. Afton is located in USDA Plant Hardiness Zone 5b. 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 | -9.6 °C | -0.2 °C | 77.72 mm |
| February | -9.1 °C | 1.2 °C | 65.53 mm |
| March | -5.3 °C | 6 °C | 84.07 mm |
| April | 0.8 °C | 14.3 °C | 95.25 mm |
| May | 7 °C | 21.3 °C | 97.54 mm |
| June | 12.1 °C | 25.7 °C | 122.94 mm |
| July | 14.7 °C | 27.8 °C | 110.49 mm |
| August | 13.9 °C | 26.9 °C | 112.27 mm |
| September | 10.1 °C | 23 °C | 102.62 mm |
| October | 4.2 °C | 16.2 °C | 103.38 mm |
| November | -1.1 °C | 8.4 °C | 80.52 mm |
| December | -5.4 °C | 2.7 °C | 82.55 mm |
| Annual | 2.7 °C | 14.4 °C | 1134.88 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |