Wallingford, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.5 °F (low) to 56.3 °F (high). Annual precipitation averages 43.7 Inches. Wallingford is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.8 °F | 29.8 °F | 2.96 in. |
| February | 12.1 °F | 33.1 °F | 2.38 in. |
| March | 21.4 °F | 41.6 °F | 3.09 in. |
| April | 33.3 °F | 55.2 °F | 3.42 in. |
| May | 44.4 °F | 67.7 °F | 3.89 in. |
| June | 53.7 °F | 75.9 °F | 4.62 in. |
| July | 58.3 °F | 80.5 °F | 4.62 in. |
| August | 56.6 °F | 78.8 °F | 4.17 in. |
| September | 48.9 °F | 71.7 °F | 3.67 in. |
| October | 38.0 °F | 58.7 °F | 4.27 in. |
| November | 28.7 °F | 46.7 °F | 3.08 in. |
| December | 19.3 °F | 35.3 °F | 3.51 in. |
| Annual | 35.5 °F | 56.3 °F | 43.68 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |