Chester Gap, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.5 °C (low) to 17.3 °C (high). Annual precipitation averages 1224.5 Millimeters. Chester Gap is located in USDA Plant Hardiness Zone 7a. 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 | -4.9 °C | 4.6 °C | 85.34 mm |
| February | -4.3 °C | 6.6 °C | 67.31 mm |
| March | -0.4 °C | 10.9 °C | 99.06 mm |
| April | 5.3 °C | 17.6 °C | 91.95 mm |
| May | 10.6 °C | 22.1 °C | 127.51 mm |
| June | 15.6 °C | 26.6 °C | 131.57 mm |
| July | 18.1 °C | 28.9 °C | 112.01 mm |
| August | 17 °C | 27.9 °C | 99.57 mm |
| September | 14.1 °C | 24.6 °C | 131.32 mm |
| October | 7.6 °C | 18.6 °C | 98.04 mm |
| November | 1.7 °C | 12.2 °C | 90.17 mm |
| December | -2 °C | 6.7 °C | 90.68 mm |
| Annual | 6.5 °C | 17.3 °C | 1224.53 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |