Varnville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.3 °C (low) to 25 °C (high). Annual precipitation averages 1233.9 Millimeters. Varnville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °C | 15.6 °C | 98.04 mm |
| February | 4 °C | 17.5 °C | 91.95 mm |
| March | 7.2 °C | 21.3 °C | 94.49 mm |
| April | 11.3 °C | 25.4 °C | 82.3 mm |
| May | 15.9 °C | 29.1 °C | 82.55 mm |
| June | 20.2 °C | 32.1 °C | 146.81 mm |
| July | 22.1 °C | 33.3 °C | 135.38 mm |
| August | 21.8 °C | 32.6 °C | 145.54 mm |
| September | 19 °C | 30.1 °C | 108.97 mm |
| October | 12.9 °C | 25.7 °C | 80.52 mm |
| November | 7 °C | 20.6 °C | 73.41 mm |
| December | 3.9 °C | 16.8 °C | 93.98 mm |
| Annual | 12.3 °C | 25 °C | 1233.94 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |