Folly Beach, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.4 °C (low) to 23.1 °C (high). Annual precipitation averages 1332.2 Millimeters. 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 | 5.8 °C | 14.4 °C | 85.34 mm |
| February | 6.5 °C | 15.8 °C | 83.82 mm |
| March | 10.2 °C | 18.9 °C | 89.66 mm |
| April | 14.4 °C | 22.6 °C | 80.52 mm |
| May | 19.4 °C | 26.3 °C | 83.31 mm |
| June | 23.2 °C | 29.3 °C | 139.19 mm |
| July | 24.7 °C | 31.1 °C | 166.62 mm |
| August | 24.2 °C | 30.5 °C | 175.77 mm |
| September | 22.1 °C | 28.4 °C | 144.27 mm |
| October | 16.6 °C | 24.4 °C | 120.9 mm |
| November | 10.8 °C | 19.8 °C | 72.9 mm |
| December | 7.3 °C | 15.9 °C | 89.92 mm |
| Annual | 15.4 °C | 23.1 °C | 1332.22 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |