Tunnelton, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 16 °C (high). Annual precipitation averages 1393.5 Millimeters. Tunnelton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.4 °C | 3 °C | 108.71 mm |
| February | -5.7 °C | 4.9 °C | 101.09 mm |
| March | -2.1 °C | 9.7 °C | 117.86 mm |
| April | 3.6 °C | 16.8 °C | 120.4 mm |
| May | 8.8 °C | 21.3 °C | 135.13 mm |
| June | 13.4 °C | 25.2 °C | 141.73 mm |
| July | 15.6 °C | 27 °C | 151.89 mm |
| August | 14.8 °C | 26.5 °C | 113.03 mm |
| September | 11.2 °C | 23.6 °C | 99.57 mm |
| October | 4.9 °C | 17.4 °C | 97.54 mm |
| November | -0.2 °C | 10.9 °C | 95.25 mm |
| December | -3.8 °C | 5.4 °C | 111.25 mm |
| Annual | 4.5 °C | 16 °C | 1393.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |