Wallingford, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 13.5 °C (high). Annual precipitation averages 1109.5 Millimeters. 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 | -11.8 °C | -1.2 °C | 75.18 mm |
| February | -11.1 °C | 0.6 °C | 60.45 mm |
| March | -5.9 °C | 5.3 °C | 78.49 mm |
| April | 0.7 °C | 12.9 °C | 86.87 mm |
| May | 6.9 °C | 19.8 °C | 98.81 mm |
| June | 12.1 °C | 24.4 °C | 117.35 mm |
| July | 14.6 °C | 26.9 °C | 117.35 mm |
| August | 13.7 °C | 26 °C | 105.92 mm |
| September | 9.4 °C | 22.1 °C | 93.22 mm |
| October | 3.3 °C | 14.8 °C | 108.46 mm |
| November | -1.8 °C | 8.2 °C | 78.23 mm |
| December | -7.1 °C | 1.8 °C | 89.15 mm |
| Annual | 1.9 °C | 13.5 °C | 1109.48 mm |
| 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 : -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 |