Heuvelton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 12.5 °C (high). Annual precipitation averages 981.7 Millimeters. Heuvelton is located in USDA Plant Hardiness Zone 5a. 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 | -12.9 °C | -3.2 °C | 73.66 mm |
| February | -12.3 °C | -1.8 °C | 59.69 mm |
| March | -6.5 °C | 3.2 °C | 64.01 mm |
| April | 1.1 °C | 11.6 °C | 82.04 mm |
| May | 7.7 °C | 19.2 °C | 82.3 mm |
| June | 13 °C | 24 °C | 92.2 mm |
| July | 15.7 °C | 26.7 °C | 92.71 mm |
| August | 14.6 °C | 25.9 °C | 85.09 mm |
| September | 10.1 °C | 21.9 °C | 90.17 mm |
| October | 4.2 °C | 14.3 °C | 100.08 mm |
| November | -1.5 °C | 7.2 °C | 80.26 mm |
| December | -8 °C | 0.4 °C | 79.5 mm |
| Annual | 2.1 °C | 12.5 °C | 981.71 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |