Farmington, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.3 °F (low) to 63.7 °F (high). Annual precipitation averages 48.7 Inches. Farmington is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.3 °F | 39.5 °F | 3.75 in. |
| February | 22.9 °F | 42.7 °F | 3.27 in. |
| March | 29.4 °F | 52.2 °F | 4.06 in. |
| April | 39.2 °F | 65.8 °F | 4.0 in. |
| May | 48.9 °F | 74.0 °F | 4.91 in. |
| June | 57.8 °F | 81.1 °F | 4.79 in. |
| July | 62.0 °F | 84.4 °F | 5.42 in. |
| August | 60.6 °F | 83.4 °F | 4.11 in. |
| September | 53.5 °F | 77.8 °F | 3.7 in. |
| October | 41.6 °F | 66.1 °F | 3.42 in. |
| November | 32.2 °F | 53.7 °F | 3.32 in. |
| December | 26.0 °F | 43.3 °F | 3.9 in. |
| Annual | 41.3 °F | 63.7 °F | 48.65 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |