Cassville, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 63.1 °F (high). Annual precipitation averages 46.6 Inches. Cassville 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.5 °F | 39.2 °F | 3.53 in. |
| February | 23.1 °F | 42.5 °F | 3.21 in. |
| March | 29.6 °F | 51.7 °F | 3.92 in. |
| April | 39.2 °F | 64.5 °F | 3.95 in. |
| May | 49.2 °F | 73.1 °F | 4.6 in. |
| June | 57.8 °F | 80.3 °F | 4.54 in. |
| July | 62.0 °F | 83.8 °F | 4.96 in. |
| August | 60.5 °F | 82.8 °F | 3.99 in. |
| September | 53.7 °F | 77.1 °F | 3.61 in. |
| October | 42.3 °F | 65.4 °F | 3.31 in. |
| November | 32.8 °F | 53.6 °F | 3.27 in. |
| December | 26.3 °F | 43.3 °F | 3.75 in. |
| Annual | 41.5 °F | 63.1 °F | 46.64 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |