Dover, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.4 °C (high). Annual precipitation averages 1112.8 Millimeters. Dover is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.3 °C | 3.9 °C | 75.18 mm |
| February | -4.7 °C | 5.5 °C | 62.48 mm |
| March | -0.4 °C | 10.4 °C | 96.27 mm |
| April | 5.3 °C | 17.4 °C | 84.33 mm |
| May | 10.8 °C | 22.8 °C | 101.6 mm |
| June | 16.1 °C | 27.5 °C | 99.06 mm |
| July | 18.5 °C | 29.9 °C | 108.46 mm |
| August | 17.4 °C | 29.1 °C | 98.55 mm |
| September | 13.4 °C | 25.3 °C | 122.68 mm |
| October | 7.2 °C | 18.7 °C | 98.04 mm |
| November | 1.6 °C | 12.3 °C | 77.22 mm |
| December | -2.6 °C | 6.3 °C | 88.9 mm |
| Annual | 6.4 °C | 17.4 °C | 1112.77 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |