Southport, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.2 °F (low) to 72.3 °F (high). Annual precipitation averages 59 Inches. Southport is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.9 °F | 55.4 °F | 3.81 in. |
| February | 39.2 °F | 57.7 °F | 3.54 in. |
| March | 45.5 °F | 63.8 °F | 3.94 in. |
| April | 54.6 °F | 72.0 °F | 3.4 in. |
| May | 63.2 °F | 78.7 °F | 4.28 in. |
| June | 71.0 °F | 84.8 °F | 5.1 in. |
| July | 74.4 °F | 86.4 °F | 6.78 in. |
| August | 73.3 °F | 87.1 °F | 7.01 in. |
| September | 68.4 °F | 82.2 °F | 8.79 in. |
| October | 57.9 °F | 74.8 °F | 4.92 in. |
| November | 47.8 °F | 65.8 °F | 3.71 in. |
| December | 41.2 °F | 58.9 °F | 3.74 in. |
| Annual | 56.2 °F | 72.3 °F | 59.02 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |