Flatwoods, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.6 °F (low) to 64.7 °F (high). Annual precipitation averages 51.5 Inches. Flatwoods 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.8 °F | 41.3 °F | 3.77 in. |
| February | 23.4 °F | 44.8 °F | 3.51 in. |
| March | 30.0 °F | 53.9 °F | 4.37 in. |
| April | 39.4 °F | 66.7 °F | 4.07 in. |
| May | 49.2 °F | 74.2 °F | 5.29 in. |
| June | 57.8 °F | 81.7 °F | 5.3 in. |
| July | 62.1 °F | 84.6 °F | 6.0 in. |
| August | 60.8 °F | 83.6 °F | 4.46 in. |
| September | 54.1 °F | 78.1 °F | 3.55 in. |
| October | 42.1 °F | 67.2 °F | 3.67 in. |
| November | 31.8 °F | 55.4 °F | 3.31 in. |
| December | 26.2 °F | 45.1 °F | 4.16 in. |
| Annual | 41.6 °F | 64.7 °F | 51.46 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |