Cassville, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 17.3 °C (high). Annual precipitation averages 1184.7 Millimeters. 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 | -5.8 °C | 4 °C | 89.66 mm |
| February | -4.9 °C | 5.8 °C | 81.53 mm |
| March | -1.3 °C | 10.9 °C | 99.57 mm |
| April | 4 °C | 18.1 °C | 100.33 mm |
| May | 9.6 °C | 22.8 °C | 116.84 mm |
| June | 14.3 °C | 26.8 °C | 115.32 mm |
| July | 16.7 °C | 28.8 °C | 125.98 mm |
| August | 15.8 °C | 28.2 °C | 101.35 mm |
| September | 12.1 °C | 25.1 °C | 91.69 mm |
| October | 5.7 °C | 18.6 °C | 84.07 mm |
| November | 0.4 °C | 12 °C | 83.06 mm |
| December | -3.2 °C | 6.3 °C | 95.25 mm |
| Annual | 5.3 °C | 17.3 °C | 1184.65 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |