South Charleston, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.2 °C (high). Annual precipitation averages 1057.9 Millimeters. South Charleston 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 | -6.8 °C | 1.7 °C | 77.22 mm |
| February | -5.7 °C | 3.7 °C | 61.21 mm |
| March | -1.2 °C | 9.4 °C | 85.6 mm |
| April | 4.5 °C | 16.5 °C | 105.16 mm |
| May | 10.7 °C | 22.4 °C | 118.11 mm |
| June | 15.8 °C | 27 °C | 113.79 mm |
| July | 17.3 °C | 28.4 °C | 111 mm |
| August | 15.8 °C | 27.8 °C | 83.06 mm |
| September | 12.1 °C | 24.9 °C | 77.98 mm |
| October | 5.9 °C | 18.1 °C | 71.63 mm |
| November | 0.2 °C | 10.4 °C | 76.45 mm |
| December | -3.7 °C | 4.2 °C | 76.71 mm |
| Annual | 5.4 °C | 16.2 °C | 1057.92 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |