Sussex, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 21.4 °C (high). Annual precipitation averages 1237.7 Millimeters. Sussex 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.1 °C | 9.9 °C | 91.95 mm |
| February | -1.3 °C | 11.8 °C | 69.09 mm |
| March | 2.3 °C | 15.9 °C | 105.66 mm |
| April | 7.7 °C | 21.9 °C | 92.46 mm |
| May | 13.1 °C | 25.8 °C | 99.82 mm |
| June | 17.9 °C | 29.9 °C | 119.38 mm |
| July | 20.3 °C | 32.2 °C | 132.33 mm |
| August | 19.4 °C | 31 °C | 128.78 mm |
| September | 15.9 °C | 27.8 °C | 131.83 mm |
| October | 8.9 °C | 22.3 °C | 97.28 mm |
| November | 3.1 °C | 16.7 °C | 79.5 mm |
| December | -0.2 °C | 11.7 °C | 89.66 mm |
| Annual | 8.8 °C | 21.4 °C | 1237.74 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°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 |