Fenwick, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 16.4 °C (high). Annual precipitation averages 1413 Millimeters. Fenwick 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 | -6.9 °C | 4.3 °C | 105.66 mm |
| February | -6 °C | 6 °C | 100.58 mm |
| March | -2.3 °C | 10.7 °C | 125.98 mm |
| April | 2.9 °C | 17.3 °C | 117.86 mm |
| May | 8.2 °C | 21.7 °C | 148.08 mm |
| June | 12.8 °C | 25.3 °C | 144.78 mm |
| July | 15.1 °C | 26.9 °C | 151.38 mm |
| August | 14.4 °C | 26.4 °C | 114.55 mm |
| September | 10.8 °C | 23.6 °C | 105.41 mm |
| October | 4.3 °C | 17.9 °C | 90.42 mm |
| November | -1.3 °C | 11.3 °C | 91.95 mm |
| December | -4.5 °C | 5.8 °C | 116.33 mm |
| Annual | 4 °C | 16.4 °C | 1412.98 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |