Summitville, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 16.3 °C (high). Annual precipitation averages 1040.9 Millimeters. Summitville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 2 °C | 78.23 mm |
| February | -6.4 °C | 3.7 °C | 61.98 mm |
| March | -2.3 °C | 9.2 °C | 80.52 mm |
| April | 3.4 °C | 16.6 °C | 92.96 mm |
| May | 8.9 °C | 22.1 °C | 101.6 mm |
| June | 14 °C | 26.7 °C | 108.2 mm |
| July | 16.2 °C | 28.7 °C | 103.63 mm |
| August | 15.1 °C | 28.2 °C | 90.17 mm |
| September | 11.4 °C | 24.8 °C | 93.98 mm |
| October | 5.2 °C | 17.9 °C | 78.49 mm |
| November | 0.2 °C | 10.7 °C | 71.88 mm |
| December | -4 °C | 4.7 °C | 79.25 mm |
| Annual | 4.5 °C | 16.3 °C | 1040.89 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |