McClellanville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.8 °C (low) to 23.8 °C (high). Annual precipitation averages 1400.6 Millimeters. McClellanville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.2 °C | 14.9 °C | 84.07 mm |
| February | 4.7 °C | 16.3 °C | 84.33 mm |
| March | 8.6 °C | 19.7 °C | 99.57 mm |
| April | 12.3 °C | 23.8 °C | 83.82 mm |
| May | 17.9 °C | 27.3 °C | 84.58 mm |
| June | 21.6 °C | 30.3 °C | 160.02 mm |
| July | 23.2 °C | 32 °C | 164.08 mm |
| August | 22.7 °C | 31.2 °C | 169.42 mm |
| September | 20.7 °C | 29.1 °C | 173.48 mm |
| October | 15.1 °C | 24.9 °C | 131.32 mm |
| November | 9.2 °C | 20.2 °C | 75.44 mm |
| December | 5.7 °C | 16.3 °C | 90.42 mm |
| Annual | 13.8 °C | 23.8 °C | 1400.55 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 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 |