Fairlea, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.4 °C (low) to 17 °C (high). Annual precipitation averages 1040.4 Millimeters. Fairlea 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 4.6 °C | 76.71 mm |
| February | -4.9 °C | 6.4 °C | 71.63 mm |
| March | -1.7 °C | 11.6 °C | 91.19 mm |
| April | 3.5 °C | 17.8 °C | 94.49 mm |
| May | 8.8 °C | 22.2 °C | 112.52 mm |
| June | 13.3 °C | 25.8 °C | 107.7 mm |
| July | 15.6 °C | 27.8 °C | 98.55 mm |
| August | 14.8 °C | 27.2 °C | 86.61 mm |
| September | 10.9 °C | 24.2 °C | 87.38 mm |
| October | 4.2 °C | 18.4 °C | 65.02 mm |
| November | -1.2 °C | 11.9 °C | 63.25 mm |
| December | -4.1 °C | 6.3 °C | 85.34 mm |
| Annual | 4.4 °C | 17 °C | 1040.39 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |