Joanna, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50 °F (low) to 73.2 °F (high). Annual precipitation averages 46.3 Inches. Joanna is located in USDA Plant Hardiness Zone 8a. 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 | 31.6 °F | 54.0 °F | 4.14 in. |
| February | 34.0 °F | 57.7 °F | 3.76 in. |
| March | 40.0 °F | 65.4 °F | 4.33 in. |
| April | 48.2 °F | 74.3 °F | 3.35 in. |
| May | 57.6 °F | 81.2 °F | 3.33 in. |
| June | 65.8 °F | 87.9 °F | 4.34 in. |
| July | 69.2 °F | 91.0 °F | 3.91 in. |
| August | 68.3 °F | 89.2 °F | 4.05 in. |
| September | 62.1 °F | 83.8 °F | 3.77 in. |
| October | 49.8 °F | 74.1 °F | 3.35 in. |
| November | 39.0 °F | 64.1 °F | 3.61 in. |
| December | 34.0 °F | 56.2 °F | 4.33 in. |
| Annual | 50 °F | 73.2 °F | 46.27 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |