Folly Beach, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 59.8 °F (low) to 73.6 °F (high). Annual precipitation averages 52.5 Inches. Folly Beach is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.4 °F | 58.0 °F | 3.36 in. |
| February | 43.7 °F | 60.4 °F | 3.3 in. |
| March | 50.3 °F | 66.1 °F | 3.53 in. |
| April | 57.9 °F | 72.6 °F | 3.17 in. |
| May | 67.0 °F | 79.4 °F | 3.28 in. |
| June | 73.8 °F | 84.8 °F | 5.48 in. |
| July | 76.5 °F | 88.0 °F | 6.56 in. |
| August | 75.5 °F | 86.9 °F | 6.92 in. |
| September | 71.8 °F | 83.2 °F | 5.68 in. |
| October | 61.8 °F | 75.9 °F | 4.76 in. |
| November | 51.4 °F | 67.6 °F | 2.87 in. |
| December | 45.1 °F | 60.7 °F | 3.54 in. |
| Annual | 59.8 °F | 73.6 °F | 52.45 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |