McDowell, Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.3 °F (low) to 62.9 °F (high). Annual precipitation averages 40.6 Inches. McDowell is located in USDA Plant Hardiness Zone 6b. 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 | 20.3 °F | 40.5 °F | 3.35 in. |
| February | 22.3 °F | 43.8 °F | 2.52 in. |
| March | 28.5 °F | 51.9 °F | 3.02 in. |
| April | 37.3 °F | 63.9 °F | 3.98 in. |
| May | 46.9 °F | 71.9 °F | 4.2 in. |
| June | 55.0 °F | 78.9 °F | 4.06 in. |
| July | 58.9 °F | 82.5 °F | 3.84 in. |
| August | 57.5 °F | 81.5 °F | 3.02 in. |
| September | 51.1 °F | 75.9 °F | 3.9 in. |
| October | 39.7 °F | 65.5 °F | 2.62 in. |
| November | 30.0 °F | 53.8 °F | 2.69 in. |
| December | 24.0 °F | 44.3 °F | 3.42 in. |
| Annual | 39.3 °F | 62.9 °F | 40.62 in. |
| 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |