Islandton, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.2 °F (low) to 76.8 °F (high). Annual precipitation averages 49.9 Inches. Islandton 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.7 °F | 60.0 °F | 3.81 in. |
| February | 39.2 °F | 63.3 °F | 3.7 in. |
| March | 45.1 °F | 70.1 °F | 3.73 in. |
| April | 52.4 °F | 77.4 °F | 3.25 in. |
| May | 60.9 °F | 84.1 °F | 3.41 in. |
| June | 68.4 °F | 89.4 °F | 5.71 in. |
| July | 71.6 °F | 91.9 °F | 5.68 in. |
| August | 71.2 °F | 90.3 °F | 5.95 in. |
| September | 66.3 °F | 85.8 °F | 4.68 in. |
| October | 55.2 °F | 78.1 °F | 3.41 in. |
| November | 44.6 °F | 69.0 °F | 2.84 in. |
| December | 39.3 °F | 62.2 °F | 3.76 in. |
| Annual | 54.2 °F | 76.8 °F | 49.93 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |