Wilmington, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.9 °F (low) to 53.9 °F (high). Annual precipitation averages 58.2 Inches. 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 | 9.5 °F | 29.0 °F | 4.21 in. |
| February | 9.1 °F | 31.3 °F | 3.74 in. |
| March | 17.2 °F | 39.3 °F | 4.55 in. |
| April | 29.3 °F | 52.0 °F | 4.56 in. |
| May | 40.6 °F | 64.0 °F | 4.56 in. |
| June | 49.8 °F | 73.0 °F | 5.54 in. |
| July | 54.3 °F | 77.3 °F | 4.74 in. |
| August | 52.3 °F | 76.1 °F | 4.85 in. |
| September | 44.6 °F | 69.5 °F | 5.37 in. |
| October | 34.4 °F | 56.7 °F | 6.03 in. |
| November | 25.5 °F | 44.7 °F | 4.66 in. |
| December | 16.1 °F | 33.8 °F | 5.43 in. |
| Annual | 31.9 °F | 53.9 °F | 58.24 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |