Swepsonville, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 21.4 °C (high). Annual precipitation averages 1181.6 Millimeters. Swepsonville is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.5 °C | 10.2 °C | 92.2 mm |
| February | -0.5 °C | 12.1 °C | 74.17 mm |
| March | 3.3 °C | 16.4 °C | 105.66 mm |
| April | 8.1 °C | 21.9 °C | 97.54 mm |
| May | 13.2 °C | 25.9 °C | 91.95 mm |
| June | 18.1 °C | 30 °C | 110.74 mm |
| July | 20.3 °C | 31.7 °C | 116.33 mm |
| August | 19.4 °C | 30.8 °C | 106.43 mm |
| September | 16.1 °C | 27.6 °C | 126.49 mm |
| October | 8.9 °C | 22.1 °C | 83.57 mm |
| November | 2.9 °C | 16.4 °C | 85.09 mm |
| December | 0.1 °C | 11.8 °C | 91.44 mm |
| Annual | 9 °C | 21.4 °C | 1181.61 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |