Clay, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.6 °F (low) to 65.6 °F (high). Annual precipitation averages 49.1 Inches. Clay 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 | 22.6 °F | 42.2 °F | 3.57 in. |
| February | 24.7 °F | 46.0 °F | 3.45 in. |
| March | 31.3 °F | 55.3 °F | 4.38 in. |
| April | 40.3 °F | 67.6 °F | 4.0 in. |
| May | 50.7 °F | 75.6 °F | 4.91 in. |
| June | 58.8 °F | 82.2 °F | 4.99 in. |
| July | 63.2 °F | 85.6 °F | 5.48 in. |
| August | 61.6 °F | 84.4 °F | 4.23 in. |
| September | 55.0 °F | 78.9 °F | 3.78 in. |
| October | 43.0 °F | 67.4 °F | 3.29 in. |
| November | 32.4 °F | 55.8 °F | 3.11 in. |
| December | 27.4 °F | 46.1 °F | 3.91 in. |
| Annual | 42.6 °F | 65.6 °F | 49.1 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |