Charles Town, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.1 °C (low) to 18.4 °C (high). Annual precipitation averages 1058.2 Millimeters. Charles Town 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 | -5 °C | 5.3 °C | 74.42 mm |
| February | -4.1 °C | 7.3 °C | 60.96 mm |
| March | -0.4 °C | 11.8 °C | 86.36 mm |
| April | 5.2 °C | 18.6 °C | 85.85 mm |
| May | 10.6 °C | 23.4 °C | 110.74 mm |
| June | 15.4 °C | 27.9 °C | 100.33 mm |
| July | 17.9 °C | 30.5 °C | 100.33 mm |
| August | 16.8 °C | 29.6 °C | 82.04 mm |
| September | 12.9 °C | 25.8 °C | 110.74 mm |
| October | 6.3 °C | 19.7 °C | 86.61 mm |
| November | 0.9 °C | 13.2 °C | 75.95 mm |
| December | -2.9 °C | 7.4 °C | 83.82 mm |
| Annual | 6.1 °C | 18.4 °C | 1058.15 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |