South Charleston, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.4 °C (low) to 19.3 °C (high). Annual precipitation averages 1145.8 Millimeters. South Charleston 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 | -4.7 °C | 6.2 °C | 79.5 mm |
| February | -3.7 °C | 8.3 °C | 76.96 mm |
| March | -0.2 °C | 13.4 °C | 100.84 mm |
| April | 5.1 °C | 20.4 °C | 93.47 mm |
| May | 10.9 °C | 24.7 °C | 124.71 mm |
| June | 15.6 °C | 28.5 °C | 106.43 mm |
| July | 18 °C | 30.3 °C | 145.29 mm |
| August | 17.2 °C | 29.8 °C | 94.49 mm |
| September | 13.3 °C | 26.8 °C | 83.57 mm |
| October | 6.6 °C | 20.7 °C | 76.71 mm |
| November | 0.6 °C | 13.9 °C | 71.12 mm |
| December | -2.4 °C | 8.3 °C | 92.71 mm |
| Annual | 6.4 °C | 19.3 °C | 1145.8 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |