Gwynn, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.3 °C (low) to 19.7 °C (high). Annual precipitation averages 1247.9 Millimeters. Gwynn is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.1 °C | 8.7 °C | 89.15 mm |
| February | 0.6 °C | 9.8 °C | 76.71 mm |
| March | 3.7 °C | 13.4 °C | 108.46 mm |
| April | 9.3 °C | 19.2 °C | 92.2 mm |
| May | 14.8 °C | 23.4 °C | 97.54 mm |
| June | 20 °C | 28.1 °C | 107.7 mm |
| July | 22.7 °C | 30.4 °C | 130.05 mm |
| August | 22.1 °C | 29.4 °C | 139.19 mm |
| September | 19.3 °C | 26.6 °C | 124.46 mm |
| October | 13.1 °C | 21.2 °C | 110.24 mm |
| November | 7.1 °C | 15.4 °C | 77.98 mm |
| December | 2.7 °C | 11.1 °C | 94.23 mm |
| Annual | 11.3 °C | 19.7 °C | 1247.91 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |