Brandonville, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 15.8 °C (high). Annual precipitation averages 1260.1 Millimeters. Brandonville is located in USDA Plant Hardiness Zone 6a. 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 | -7.2 °C | 2.6 °C | 98.55 mm |
| February | -6.1 °C | 4.6 °C | 93.98 mm |
| March | -2.5 °C | 9.3 °C | 107.44 mm |
| April | 2.9 °C | 16.4 °C | 109.22 mm |
| May | 8.3 °C | 21.4 °C | 126.49 mm |
| June | 13 °C | 25.4 °C | 118.62 mm |
| July | 15.3 °C | 27.3 °C | 128.78 mm |
| August | 14.4 °C | 26.7 °C | 117.35 mm |
| September | 10.5 °C | 23.5 °C | 91.69 mm |
| October | 4.3 °C | 17.1 °C | 85.34 mm |
| November | -0.8 °C | 10.7 °C | 81.03 mm |
| December | -4.3 °C | 5 °C | 101.6 mm |
| Annual | 4 °C | 15.8 °C | 1260.09 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |