Branchville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.5 °C (high). Annual precipitation averages 1247.4 Millimeters. Branchville 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 14.8 °C | 95.25 mm |
| February | 3.7 °C | 16.8 °C | 94.23 mm |
| March | 7 °C | 20.7 °C | 94.49 mm |
| April | 11.2 °C | 24.9 °C | 86.36 mm |
| May | 15.9 °C | 28.7 °C | 91.19 mm |
| June | 20.3 °C | 31.8 °C | 132.59 mm |
| July | 22.1 °C | 33.3 °C | 141.73 mm |
| August | 21.7 °C | 32.3 °C | 141.22 mm |
| September | 18.8 °C | 29.7 °C | 116.08 mm |
| October | 12.5 °C | 25 °C | 87.63 mm |
| November | 6.4 °C | 19.9 °C | 70.36 mm |
| December | 3.6 °C | 16.1 °C | 96.27 mm |
| Annual | 12.1 °C | 24.5 °C | 1247.4 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |