Mount Pleasant, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.4 °F (low) to 74.4 °F (high). Annual precipitation averages 52 Inches. 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 | 40.8 °F | 58.7 °F | 3.41 in. |
| February | 42.5 °F | 61.1 °F | 3.21 in. |
| March | 48.9 °F | 67.1 °F | 3.23 in. |
| April | 56.8 °F | 73.5 °F | 3.18 in. |
| May | 65.6 °F | 80.3 °F | 3.04 in. |
| June | 72.3 °F | 85.6 °F | 5.51 in. |
| July | 75.2 °F | 88.9 °F | 6.6 in. |
| August | 74.4 °F | 87.6 °F | 6.92 in. |
| September | 70.5 °F | 83.9 °F | 5.92 in. |
| October | 60.4 °F | 76.5 °F | 4.64 in. |
| November | 49.9 °F | 68.1 °F | 2.86 in. |
| December | 43.7 °F | 61.4 °F | 3.45 in. |
| Annual | 58.4 °F | 74.4 °F | 51.97 in. |
| 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 : 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 |