Masontown, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.6 °C (low) to 16.2 °C (high). Annual precipitation averages 1326.7 Millimeters. Masontown 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 3.2 °C | 102.62 mm |
| February | -5.5 °C | 5.1 °C | 91.95 mm |
| March | -1.9 °C | 10 °C | 108.2 mm |
| April | 3.6 °C | 17 °C | 114.05 mm |
| May | 8.8 °C | 21.6 °C | 130.3 mm |
| June | 13.5 °C | 25.4 °C | 131.83 mm |
| July | 15.7 °C | 27.3 °C | 147.32 mm |
| August | 15 °C | 26.8 °C | 111.25 mm |
| September | 11.3 °C | 23.9 °C | 92.71 mm |
| October | 5.1 °C | 17.6 °C | 92.46 mm |
| November | -0.1 °C | 11.1 °C | 96.01 mm |
| December | -3.7 °C | 5.6 °C | 107.95 mm |
| Annual | 4.6 °C | 16.2 °C | 1326.65 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |