Walterboro, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 24.7 °C (high). Annual precipitation averages 1314.2 Millimeters. Walterboro 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 | 2.5 °C | 15.4 °C | 93.73 mm |
| February | 3.8 °C | 17.2 °C | 95.76 mm |
| March | 7.1 °C | 21 °C | 93.47 mm |
| April | 11.1 °C | 24.9 °C | 83.57 mm |
| May | 15.9 °C | 28.6 °C | 90.42 mm |
| June | 20.2 °C | 31.5 °C | 147.83 mm |
| July | 21.9 °C | 33.2 °C | 158.75 mm |
| August | 21.7 °C | 32.2 °C | 167.64 mm |
| September | 19 °C | 29.7 °C | 126.24 mm |
| October | 12.8 °C | 25.3 °C | 87.38 mm |
| November | 6.8 °C | 20.4 °C | 73.15 mm |
| December | 4 °C | 16.9 °C | 96.27 mm |
| Annual | 12.2 °C | 24.7 °C | 1314.21 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |