Mullens, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 5.8 °C (low) to 18.3 °C (high). Annual precipitation averages 1240 Millimeters. Mullens is located in USDA Plant Hardiness Zone 7a. 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 | -4.9 °C | 5.8 °C | 100.58 mm |
| February | -3.7 °C | 8.1 °C | 91.95 mm |
| March | -0.4 °C | 12.8 °C | 106.93 mm |
| April | 4.5 °C | 19.6 °C | 113.79 mm |
| May | 10.1 °C | 23.7 °C | 131.83 mm |
| June | 14.8 °C | 27.2 °C | 114.3 mm |
| July | 17.1 °C | 28.9 °C | 134.37 mm |
| August | 16.4 °C | 28.3 °C | 101.6 mm |
| September | 12.8 °C | 25.4 °C | 85.34 mm |
| October | 5.8 °C | 19.6 °C | 77.98 mm |
| November | 0.1 °C | 13.1 °C | 80.52 mm |
| December | -2.8 °C | 7.6 °C | 100.84 mm |
| Annual | 5.8 °C | 18.3 °C | 1240.03 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |