Dover, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.4 °C (low) to 10.5 °C (high). Annual precipitation averages 1531.9 Millimeters. Dover is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.3 °C | -3.2 °C | 115.82 mm |
| February | -11.9 °C | -1.9 °C | 95 mm |
| March | -7.8 °C | 2.3 °C | 119.38 mm |
| April | -1.2 °C | 9.4 °C | 122.94 mm |
| May | 5.3 °C | 16.2 °C | 123.44 mm |
| June | 10.1 °C | 20.9 °C | 148.59 mm |
| July | 12.6 °C | 23.3 °C | 122.43 mm |
| August | 11.8 °C | 22.7 °C | 129.54 mm |
| September | 8.3 °C | 19.3 °C | 131.57 mm |
| October | 2 °C | 12.3 °C | 157.48 mm |
| November | -3.1 °C | 5.3 °C | 124.46 mm |
| December | -8.6 °C | -0.2 °C | 141.22 mm |
| Annual | 0.4 °C | 10.5 °C | 1531.87 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |