Charleston, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.7 °F (low) to 70.5 °F (high). Annual precipitation averages 57.9 Inches. Charleston is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.7 °F | 48.8 °F | 5.41 in. |
| February | 31.4 °F | 53.2 °F | 4.82 in. |
| March | 37.6 °F | 61.9 °F | 5.71 in. |
| April | 45.8 °F | 71.5 °F | 4.97 in. |
| May | 55.7 °F | 79.1 °F | 4.38 in. |
| June | 63.9 °F | 85.8 °F | 4.88 in. |
| July | 67.9 °F | 88.8 °F | 5.51 in. |
| August | 66.6 °F | 88.4 °F | 3.85 in. |
| September | 60.0 °F | 83.3 °F | 4.75 in. |
| October | 47.3 °F | 72.8 °F | 3.24 in. |
| November | 36.0 °F | 60.9 °F | 4.69 in. |
| December | 31.4 °F | 51.6 °F | 5.71 in. |
| Annual | 47.7 °F | 70.5 °F | 57.92 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |