Summerton, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.8 °C (low) to 24.2 °C (high). Annual precipitation averages 1249.4 Millimeters. Summerton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 14.1 °C | 98.81 mm |
| February | 3.1 °C | 16 °C | 93.73 mm |
| March | 6.4 °C | 20.2 °C | 96.01 mm |
| April | 11.1 °C | 24.9 °C | 85.85 mm |
| May | 15.8 °C | 28.5 °C | 92.96 mm |
| June | 20.2 °C | 31.6 °C | 131.57 mm |
| July | 22.1 °C | 33.1 °C | 133.86 mm |
| August | 21.4 °C | 32.2 °C | 141.22 mm |
| September | 18.4 °C | 29.4 °C | 120.65 mm |
| October | 12.1 °C | 24.9 °C | 92.2 mm |
| November | 5.9 °C | 19.6 °C | 69.6 mm |
| December | 3.2 °C | 15.6 °C | 92.96 mm |
| Annual | 11.8 °C | 24.2 °C | 1249.42 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |