Hanover, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16.5 °C (high). Annual precipitation averages 1068.6 Millimeters. Hanover is located in USDA Plant Hardiness Zone 6a. 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 | -6.9 °C | 2.3 °C | 81.53 mm |
| February | -5.9 °C | 4.1 °C | 63.75 mm |
| March | -1.6 °C | 9.7 °C | 89.15 mm |
| April | 4.2 °C | 17.1 °C | 100.08 mm |
| May | 9.9 °C | 22.4 °C | 104.14 mm |
| June | 14.9 °C | 26.9 °C | 117.09 mm |
| July | 16.9 °C | 28.8 °C | 107.7 mm |
| August | 15.8 °C | 28.1 °C | 93.73 mm |
| September | 11.7 °C | 24.7 °C | 83.31 mm |
| October | 5.3 °C | 18 °C | 73.66 mm |
| November | 0.1 °C | 10.9 °C | 75.69 mm |
| December | -3.9 °C | 4.8 °C | 78.74 mm |
| Annual | 5 °C | 16.5 °C | 1068.57 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |