Dover, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.8 °F (low) to 51 °F (high). Annual precipitation averages 60.3 Inches. 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 | 9.8 °F | 26.3 °F | 4.56 in. |
| February | 10.6 °F | 28.5 °F | 3.74 in. |
| March | 18.0 °F | 36.2 °F | 4.7 in. |
| April | 29.9 °F | 48.9 °F | 4.84 in. |
| May | 41.6 °F | 61.1 °F | 4.86 in. |
| June | 50.2 °F | 69.6 °F | 5.85 in. |
| July | 54.7 °F | 74.0 °F | 4.82 in. |
| August | 53.3 °F | 72.9 °F | 5.1 in. |
| September | 47.0 °F | 66.7 °F | 5.18 in. |
| October | 35.6 °F | 54.1 °F | 6.2 in. |
| November | 26.5 °F | 41.6 °F | 4.9 in. |
| December | 16.6 °F | 31.7 °F | 5.56 in. |
| Annual | 32.8 °F | 51 °F | 60.31 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |