Wilton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.2 °F (low) to 58.1 °F (high). Annual precipitation averages 45.4 Inches. Wilton 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 | 13.9 °F | 31.4 °F | 3.31 in. |
| February | 15.0 °F | 34.4 °F | 2.62 in. |
| March | 24.0 °F | 43.3 °F | 3.41 in. |
| April | 35.7 °F | 57.8 °F | 3.77 in. |
| May | 47.3 °F | 70.0 °F | 3.68 in. |
| June | 56.4 °F | 78.0 °F | 4.57 in. |
| July | 61.1 °F | 82.6 °F | 4.84 in. |
| August | 59.6 °F | 80.7 °F | 4.04 in. |
| September | 51.9 °F | 73.6 °F | 3.63 in. |
| October | 40.7 °F | 60.7 °F | 4.36 in. |
| November | 30.7 °F | 47.9 °F | 3.35 in. |
| December | 21.6 °F | 36.7 °F | 3.83 in. |
| Annual | 38.2 °F | 58.1 °F | 45.41 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |