Big Sandy, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 42.9 °F (low) to 65.6 °F (high). Annual precipitation averages 46.7 Inches. Big Sandy is located in USDA Plant Hardiness Zone 7a. 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 | 23.3 °F | 42.7 °F | 3.58 in. |
| February | 25.7 °F | 47.1 °F | 3.32 in. |
| March | 31.4 °F | 55.8 °F | 4.19 in. |
| April | 40.4 °F | 68.2 °F | 4.37 in. |
| May | 50.5 °F | 75.1 °F | 4.73 in. |
| June | 59.4 °F | 81.6 °F | 4.48 in. |
| July | 63.6 °F | 84.7 °F | 5.22 in. |
| August | 62.6 °F | 83.5 °F | 3.94 in. |
| September | 55.6 °F | 78.6 °F | 3.23 in. |
| October | 43.0 °F | 67.7 °F | 2.85 in. |
| November | 32.3 °F | 55.9 °F | 2.91 in. |
| December | 27.2 °F | 46.1 °F | 3.91 in. |
| Annual | 42.9 °F | 65.6 °F | 46.73 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |