Stonewood, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.2 °C (low) to 17.7 °C (high). Annual precipitation averages 1230.4 Millimeters. Stonewood is located in USDA Plant Hardiness Zone 6b. 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 | -5.9 °C | 4.5 °C | 93.73 mm |
| February | -5 °C | 6.3 °C | 88.65 mm |
| March | -1.3 °C | 11.4 °C | 107.44 mm |
| April | 4.1 °C | 18.7 °C | 101.85 mm |
| May | 9.6 °C | 23.2 °C | 121.67 mm |
| June | 14.4 °C | 27.3 °C | 120.14 mm |
| July | 16.7 °C | 28.9 °C | 135.89 mm |
| August | 15.9 °C | 28.4 °C | 104.14 mm |
| September | 11.9 °C | 25.3 °C | 90.17 mm |
| October | 5.2 °C | 18.8 °C | 85.85 mm |
| November | -0.1 °C | 12.3 °C | 83.06 mm |
| December | -3.3 °C | 6.7 °C | 97.79 mm |
| Annual | 5.2 °C | 17.7 °C | 1230.38 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |