New Martinsville, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42.1 °F (low) to 64 °F (high). Annual precipitation averages 46.5 Inches. New Martinsville 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 | 21.6 °F | 39.4 °F | 3.7 in. |
| February | 23.1 °F | 42.7 °F | 3.09 in. |
| March | 29.8 °F | 52.3 °F | 4.07 in. |
| April | 39.6 °F | 66.1 °F | 3.94 in. |
| May | 49.9 °F | 74.3 °F | 4.6 in. |
| June | 59.0 °F | 81.7 °F | 4.67 in. |
| July | 63.4 °F | 84.8 °F | 4.75 in. |
| August | 62.2 °F | 84.2 °F | 3.75 in. |
| September | 55.0 °F | 78.3 °F | 3.8 in. |
| October | 42.8 °F | 66.8 °F | 3.19 in. |
| November | 32.5 °F | 54.2 °F | 3.24 in. |
| December | 26.4 °F | 43.6 °F | 3.65 in. |
| Annual | 42.1 °F | 64 °F | 46.45 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 | Dfb - Humid Continental Mild Summer, Wet All Year |