Nassawadox, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 20 °C (high). Annual precipitation averages 1172 Millimeters. Nassawadox 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 | -0.8 °C | 8.8 °C | 90.17 mm |
| February | -0.2 °C | 10 °C | 76.2 mm |
| March | 3.2 °C | 13.6 °C | 105.41 mm |
| April | 8.5 °C | 19.4 °C | 87.88 mm |
| May | 13.9 °C | 23.9 °C | 88.65 mm |
| June | 18.8 °C | 28.6 °C | 100.33 mm |
| July | 21.7 °C | 30.9 °C | 116.84 mm |
| August | 20.4 °C | 29.7 °C | 116.08 mm |
| September | 17.7 °C | 26.9 °C | 115.32 mm |
| October | 11.7 °C | 21.5 °C | 101.6 mm |
| November | 5.7 °C | 15.6 °C | 75.69 mm |
| December | 1.8 °C | 11.2 °C | 97.79 mm |
| Annual | 10.2 °C | 20 °C | 1171.96 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 |