Charleston, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11 °C (low) to 23 °C (high). Annual precipitation averages 1496.8 Millimeters. Charleston is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.2 °C | 10.8 °C | 131.06 mm |
| February | 1.8 °C | 13.4 °C | 138.94 mm |
| March | 5.9 °C | 18.4 °C | 131.06 mm |
| April | 10.6 °C | 23.3 °C | 155.96 mm |
| May | 15.9 °C | 27.6 °C | 140.46 mm |
| June | 20.1 °C | 31.4 °C | 128.27 mm |
| July | 21.8 °C | 32.8 °C | 119.89 mm |
| August | 21.1 °C | 32.9 °C | 90.42 mm |
| September | 17.2 °C | 30.3 °C | 90.93 mm |
| October | 10.6 °C | 24.6 °C | 92.96 mm |
| November | 4.9 °C | 17.7 °C | 120.4 mm |
| December | 1.6 °C | 12.4 °C | 156.46 mm |
| Annual | 11 °C | 23 °C | 1496.81 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |