McDowell, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.3 °C (low) to 19.9 °C (high). Annual precipitation averages 1209 Millimeters. McDowell is located in USDA Plant Hardiness Zone 7a. 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 | -3.6 °C | 7.2 °C | 90.17 mm |
| February | -2.3 °C | 9.6 °C | 90.93 mm |
| March | 1.1 °C | 14.7 °C | 114.3 mm |
| April | 6.3 °C | 21.1 °C | 105.41 mm |
| May | 11.7 °C | 25.3 °C | 113.03 mm |
| June | 16.3 °C | 28.8 °C | 119.63 mm |
| July | 18.4 °C | 30.7 °C | 135.89 mm |
| August | 17.8 °C | 29.9 °C | 100.33 mm |
| September | 14.2 °C | 26.8 °C | 83.31 mm |
| October | 7.3 °C | 20.9 °C | 74.68 mm |
| November | 1.7 °C | 14.7 °C | 75.18 mm |
| December | -1.2 °C | 9.1 °C | 106.17 mm |
| Annual | 7.3 °C | 19.9 °C | 1209.03 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |