Dover, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.3 °C (high). Annual precipitation averages 1300.5 Millimeters. 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 | -6.4 °C | 2.8 °C | 95 mm |
| February | -5.9 °C | 4.1 °C | 79.25 mm |
| March | -1.8 °C | 8.8 °C | 110.24 mm |
| April | 4.3 °C | 15.9 °C | 99.31 mm |
| May | 9.7 °C | 21.4 °C | 101.09 mm |
| June | 14.9 °C | 26.2 °C | 140.72 mm |
| July | 17.6 °C | 29.3 °C | 114.3 mm |
| August | 16.8 °C | 28.2 °C | 120.4 mm |
| September | 12.6 °C | 24.3 °C | 122.94 mm |
| October | 6.2 °C | 17.7 °C | 111.76 mm |
| November | 1 °C | 11.3 °C | 89.92 mm |
| December | -3.1 °C | 5.6 °C | 115.57 mm |
| Annual | 5.5 °C | 16.3 °C | 1300.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |