Charleston, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.4 °C (low) to 19.4 °C (high). Annual precipitation averages 1129.8 Millimeters. 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 | 6.3 °C | 79.25 mm |
| February | -3.6 °C | 8.4 °C | 74.93 mm |
| March | -0.1 °C | 13.6 °C | 100.33 mm |
| April | 5.2 °C | 20.5 °C | 89.66 mm |
| May | 10.9 °C | 24.8 °C | 120.9 mm |
| June | 15.7 °C | 28.6 °C | 102.36 mm |
| July | 18 °C | 30.4 °C | 143 mm |
| August | 17.3 °C | 29.9 °C | 98.55 mm |
| September | 13.5 °C | 27 °C | 84.84 mm |
| October | 6.7 °C | 20.9 °C | 75.69 mm |
| November | 0.6 °C | 14.1 °C | 69.85 mm |
| December | -2.3 °C | 8.5 °C | 90.42 mm |
| Annual | 6.4 °C | 19.4 °C | 1129.78 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |