Harborton, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 19.6 °C (high). Annual precipitation averages 1188.7 Millimeters. Harborton 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 | -0.4 °C | 8.4 °C | 87.88 mm |
| February | 0.2 °C | 9.6 °C | 77.47 mm |
| March | 3.6 °C | 12.9 °C | 102.36 mm |
| April | 8.8 °C | 18.9 °C | 85.85 mm |
| May | 14.1 °C | 23.6 °C | 91.95 mm |
| June | 19.1 °C | 28.2 °C | 104.9 mm |
| July | 21.9 °C | 30.6 °C | 119.63 mm |
| August | 21 °C | 29.4 °C | 117.35 mm |
| September | 18 °C | 26.6 °C | 109.98 mm |
| October | 11.8 °C | 21.2 °C | 109.22 mm |
| November | 5.9 °C | 15.3 °C | 82.8 mm |
| December | 2 °C | 10.8 °C | 99.31 mm |
| Annual | 10.5 °C | 19.6 °C | 1188.7 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |