Wilmington, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Annual precipitation averages 1479.3 Millimeters. Wilmington is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.5 °C | -1.7 °C | 106.93 mm |
| February | -12.7 °C | -0.4 °C | 95 mm |
| March | -8.2 °C | 4.1 °C | 115.57 mm |
| April | -1.5 °C | 11.1 °C | 115.82 mm |
| May | 4.8 °C | 17.8 °C | 115.82 mm |
| June | 9.9 °C | 22.8 °C | 140.72 mm |
| July | 12.4 °C | 25.2 °C | 120.4 mm |
| August | 11.3 °C | 24.5 °C | 123.19 mm |
| September | 7 °C | 20.8 °C | 136.4 mm |
| October | 1.3 °C | 13.7 °C | 153.16 mm |
| November | -3.6 °C | 7.1 °C | 118.36 mm |
| December | -8.8 °C | 1 °C | 137.92 mm |
| Annual | -0 °C | 12.2 °C | 1479.29 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |