Big Chimney, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.5 °C (low) to 19.1 °C (high). Annual precipitation averages 1164.3 Millimeters. Big Chimney 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 | -4.6 °C | 6.1 °C | 84.07 mm |
| February | -3.4 °C | 8.2 °C | 77.47 mm |
| March | 0 °C | 13.3 °C | 104.14 mm |
| April | 5.4 °C | 20.2 °C | 93.73 mm |
| May | 11.1 °C | 24.3 °C | 120.65 mm |
| June | 15.7 °C | 28.2 °C | 106.43 mm |
| July | 18.1 °C | 29.9 °C | 139.19 mm |
| August | 17.3 °C | 29.5 °C | 102.87 mm |
| September | 13.4 °C | 26.6 °C | 89.92 mm |
| October | 6.7 °C | 20.4 °C | 77.47 mm |
| November | 0.8 °C | 13.7 °C | 74.93 mm |
| December | -2.3 °C | 8.3 °C | 93.47 mm |
| Annual | 6.5 °C | 19.1 °C | 1164.34 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 |