Mount Pleasant, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.7 °C (low) to 23.6 °C (high). Annual precipitation averages 1320 Millimeters. Mount Pleasant is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °C | 14.8 °C | 86.61 mm |
| February | 5.8 °C | 16.2 °C | 81.53 mm |
| March | 9.4 °C | 19.5 °C | 82.04 mm |
| April | 13.8 °C | 23.1 °C | 80.77 mm |
| May | 18.7 °C | 26.8 °C | 77.22 mm |
| June | 22.4 °C | 29.8 °C | 139.95 mm |
| July | 24 °C | 31.6 °C | 167.64 mm |
| August | 23.6 °C | 30.9 °C | 175.77 mm |
| September | 21.4 °C | 28.8 °C | 150.37 mm |
| October | 15.8 °C | 24.7 °C | 117.86 mm |
| November | 9.9 °C | 20.1 °C | 72.64 mm |
| December | 6.5 °C | 16.3 °C | 87.63 mm |
| Annual | 14.7 °C | 23.6 °C | 1320.03 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 |