Dover, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.1 °F (low) to 60.5 °F (high). Annual precipitation averages 48.9 Inches. Dover is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °F | 36.7 °F | 3.87 in. |
| February | 19.7 °F | 39.2 °F | 3.35 in. |
| March | 27.2 °F | 46.3 °F | 4.62 in. |
| April | 37.3 °F | 58.5 °F | 4.32 in. |
| May | 47.1 °F | 69.0 °F | 3.63 in. |
| June | 56.5 °F | 77.7 °F | 4.18 in. |
| July | 62.5 °F | 83.4 °F | 3.6 in. |
| August | 60.8 °F | 82.0 °F | 3.89 in. |
| September | 53.3 °F | 75.1 °F | 3.84 in. |
| October | 41.8 °F | 63.1 °F | 4.86 in. |
| November | 32.7 °F | 52.4 °F | 4.05 in. |
| December | 24.4 °F | 42.2 °F | 4.72 in. |
| Annual | 40.1 °F | 60.5 °F | 48.93 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |