Gassaway, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.9 °F (low) to 65.4 °F (high). Annual precipitation averages 50.7 Inches. Gassaway 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 | 22.0 °F | 42.0 °F | 3.65 in. |
| February | 23.8 °F | 45.5 °F | 3.52 in. |
| March | 30.2 °F | 54.8 °F | 4.22 in. |
| April | 39.5 °F | 67.5 °F | 4.03 in. |
| May | 49.8 °F | 75.1 °F | 5.11 in. |
| June | 58.2 °F | 82.3 °F | 5.2 in. |
| July | 62.6 °F | 85.3 °F | 6.18 in. |
| August | 61.3 °F | 84.3 °F | 4.37 in. |
| September | 54.4 °F | 78.9 °F | 3.43 in. |
| October | 42.4 °F | 67.9 °F | 3.64 in. |
| November | 31.9 °F | 56.0 °F | 3.27 in. |
| December | 26.7 °F | 45.7 °F | 4.05 in. |
| Annual | 41.9 °F | 65.4 °F | 50.67 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |