Charleston, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.8 °F (low) to 73.4 °F (high). Annual precipitation averages 58.9 Inches. 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 | 32.4 °F | 51.4 °F | 5.16 in. |
| February | 35.3 °F | 56.1 °F | 5.47 in. |
| March | 42.6 °F | 65.2 °F | 5.16 in. |
| April | 51.0 °F | 73.9 °F | 6.14 in. |
| May | 60.6 °F | 81.7 °F | 5.53 in. |
| June | 68.1 °F | 88.5 °F | 5.05 in. |
| July | 71.3 °F | 91.1 °F | 4.72 in. |
| August | 70.0 °F | 91.3 °F | 3.56 in. |
| September | 63.0 °F | 86.5 °F | 3.58 in. |
| October | 51.0 °F | 76.3 °F | 3.66 in. |
| November | 40.9 °F | 63.8 °F | 4.74 in. |
| December | 34.9 °F | 54.4 °F | 6.16 in. |
| Annual | 51.8 °F | 73.4 °F | 58.93 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |