Dillwyn, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 20.1 °C (high). Annual precipitation averages 1138.7 Millimeters. Dillwyn 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 | -3.3 °C | 8.5 °C | 84.07 mm |
| February | -2.4 °C | 10.5 °C | 71.12 mm |
| March | 1.2 °C | 14.9 °C | 96.77 mm |
| April | 6.5 °C | 20.8 °C | 85.09 mm |
| May | 11.9 °C | 24.4 °C | 112.78 mm |
| June | 16.6 °C | 28.7 °C | 99.06 mm |
| July | 18.9 °C | 30.8 °C | 102.11 mm |
| August | 18.1 °C | 29.9 °C | 91.19 mm |
| September | 14.3 °C | 26.6 °C | 111 mm |
| October | 7.4 °C | 20.9 °C | 100.33 mm |
| November | 1.9 °C | 15.3 °C | 92.2 mm |
| December | -1.4 °C | 10.2 °C | 92.96 mm |
| Annual | 7.5 °C | 20.1 °C | 1138.68 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |