Hartville, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 15.3 °C (high). Annual precipitation averages 1038.3 Millimeters. Hartville 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.1 °C | 0.9 °C | 73.66 mm |
| February | -6.4 °C | 2.6 °C | 58.42 mm |
| March | -2.1 °C | 7.8 °C | 80.77 mm |
| April | 3.9 °C | 15.4 °C | 93.98 mm |
| May | 9.8 °C | 21.3 °C | 102.87 mm |
| June | 14.9 °C | 25.9 °C | 113.79 mm |
| July | 17 °C | 28.1 °C | 103.89 mm |
| August | 16.1 °C | 27.3 °C | 91.69 mm |
| September | 12.2 °C | 23.7 °C | 88.9 mm |
| October | 6.2 °C | 16.9 °C | 82.8 mm |
| November | 0.8 °C | 9.7 °C | 75.18 mm |
| December | -3.8 °C | 3.7 °C | 72.39 mm |
| Annual | 5.1 °C | 15.3 °C | 1038.34 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |