Cass, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.4 °F (low) to 59.9 °F (high). Annual precipitation averages 45.5 Inches. Cass is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.6 °F | 36.8 °F | 3.32 in. |
| February | 19.3 °F | 40.9 °F | 2.97 in. |
| March | 25.6 °F | 48.8 °F | 3.91 in. |
| April | 34.2 °F | 61.6 °F | 4.07 in. |
| May | 44.0 °F | 69.1 °F | 5.03 in. |
| June | 52.0 °F | 75.9 °F | 4.47 in. |
| July | 55.9 °F | 79.6 °F | 4.1 in. |
| August | 55.0 °F | 78.9 °F | 3.84 in. |
| September | 48.3 °F | 73.4 °F | 3.93 in. |
| October | 36.8 °F | 62.4 °F | 3.17 in. |
| November | 26.9 °F | 50.0 °F | 3.0 in. |
| December | 21.2 °F | 40.9 °F | 3.69 in. |
| Annual | 36.4 °F | 59.9 °F | 45.5 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |