Walterboro, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54 °F (low) to 76.4 °F (high). Annual precipitation averages 51.7 Inches. 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 | 36.5 °F | 59.8 °F | 3.69 in. |
| February | 38.9 °F | 63.0 °F | 3.77 in. |
| March | 44.7 °F | 69.8 °F | 3.68 in. |
| April | 52.0 °F | 76.8 °F | 3.29 in. |
| May | 60.7 °F | 83.4 °F | 3.56 in. |
| June | 68.4 °F | 88.7 °F | 5.82 in. |
| July | 71.5 °F | 91.7 °F | 6.25 in. |
| August | 71.1 °F | 90.0 °F | 6.6 in. |
| September | 66.2 °F | 85.4 °F | 4.97 in. |
| October | 55.0 °F | 77.5 °F | 3.44 in. |
| November | 44.3 °F | 68.8 °F | 2.88 in. |
| December | 39.2 °F | 62.4 °F | 3.79 in. |
| Annual | 54 °F | 76.4 °F | 51.74 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |