Johnsonville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.3 °F (low) to 74.7 °F (high). Annual precipitation averages 51.3 Inches. Johnsonville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.3 °F | 57.0 °F | 3.7 in. |
| February | 36.5 °F | 60.2 °F | 3.43 in. |
| March | 42.2 °F | 67.3 °F | 3.64 in. |
| April | 50.5 °F | 75.8 °F | 3.38 in. |
| May | 59.4 °F | 82.2 °F | 3.71 in. |
| June | 67.6 °F | 87.8 °F | 4.82 in. |
| July | 71.1 °F | 90.5 °F | 5.4 in. |
| August | 69.9 °F | 89.1 °F | 6.21 in. |
| September | 64.4 °F | 83.8 °F | 6.07 in. |
| October | 52.7 °F | 76.1 °F | 4.07 in. |
| November | 42.1 °F | 66.9 °F | 3.17 in. |
| December | 37.0 °F | 59.5 °F | 3.74 in. |
| Annual | 52.3 °F | 74.7 °F | 51.34 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |