Swansboro, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.6 °F (low) to 71.6 °F (high). Annual precipitation averages 60.3 Inches. Swansboro 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 | 35.9 °F | 54.8 °F | 4.2 in. |
| February | 37.3 °F | 56.8 °F | 4.07 in. |
| March | 43.0 °F | 63.2 °F | 3.84 in. |
| April | 52.1 °F | 70.4 °F | 3.64 in. |
| May | 61.3 °F | 77.6 °F | 4.33 in. |
| June | 69.3 °F | 83.6 °F | 5.42 in. |
| July | 73.5 °F | 86.6 °F | 7.44 in. |
| August | 72.0 °F | 85.7 °F | 7.47 in. |
| September | 67.1 °F | 82.1 °F | 6.96 in. |
| October | 57.0 °F | 74.6 °F | 4.88 in. |
| November | 46.7 °F | 65.4 °F | 4.04 in. |
| December | 40.1 °F | 58.3 °F | 4.0 in. |
| Annual | 54.6 °F | 71.6 °F | 60.29 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |