Wilmington, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 54.2 °F (high). Annual precipitation averages 40.9 Inches. Wilmington is located in USDA Plant Hardiness Zone 4b. 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 | 7.3 °F | 26.9 °F | 2.65 in. |
| February | 8.9 °F | 30.0 °F | 2.18 in. |
| March | 18.3 °F | 38.8 °F | 2.86 in. |
| April | 31.2 °F | 52.8 °F | 3.2 in. |
| May | 42.9 °F | 66.1 °F | 3.62 in. |
| June | 52.4 °F | 74.7 °F | 4.5 in. |
| July | 57.2 °F | 79.2 °F | 4.05 in. |
| August | 55.4 °F | 77.5 °F | 3.99 in. |
| September | 47.6 °F | 70.6 °F | 3.56 in. |
| October | 37.1 °F | 56.7 °F | 4.16 in. |
| November | 27.0 °F | 43.9 °F | 3.11 in. |
| December | 15.7 °F | 32.6 °F | 2.97 in. |
| Annual | 33.4 °F | 54.2 °F | 40.85 in. |
| 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |