McKenney, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 20.8 °C (high). Annual precipitation averages 1193.8 Millimeters. McKenney is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 9.3 °C | 88.14 mm |
| February | -1.6 °C | 11.3 °C | 69.34 mm |
| March | 2.1 °C | 15.4 °C | 103.38 mm |
| April | 7.5 °C | 21.3 °C | 88.65 mm |
| May | 12.8 °C | 25.1 °C | 99.06 mm |
| June | 17.6 °C | 29.4 °C | 114.81 mm |
| July | 19.9 °C | 31.4 °C | 122.43 mm |
| August | 19.1 °C | 30.3 °C | 118.62 mm |
| September | 15.6 °C | 27.2 °C | 122.68 mm |
| October | 8.5 °C | 21.6 °C | 93.22 mm |
| November | 2.8 °C | 16 °C | 83.31 mm |
| December | -0.5 °C | 11.1 °C | 90.17 mm |
| Annual | 8.5 °C | 20.8 °C | 1193.81 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |