| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 57°F | 46°F | 3.4" |
| February | 38°F | 60°F | 48°F | 2.9" |
| March | 45°F | 64°F | 54°F | 3.0" |
| April | 54°F | 71°F | 63°F | 3.4" |
| May | 63°F | 78°F | 70°F | 3.4" |
| June | 70°F | 85°F | 78°F | 3.1" |
| July | 73°F | 86°F | 79°F | 4.7" |
| August | 71°F | 84°F | 78°F | 7.1" |
| September | 68°F | 82°F | 74°F | 5.6" |
| October | 57°F | 75°F | 66°F | 4.9" |
| November | 45°F | 66°F | 55°F | 5.8" |
| December | 41°F | 60°F | 49°F | 5.1" |
| Index | Swansboro | North Carolina | National |
| Air quality index | 37 | 35 | 42 |
| Pollution index | 3,449,020 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 259 |
| Days with good air quality | 239 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.050% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Sneads Ferry, NC | 2,326 | 34 | 32.0% |
| Bogue, NC | 884 | 37 | 26.0% |
| Emerald Isle, NC | 3,691 | 37 | 26.0% |
| Broad Creek, NC | 2,306 | 37 | 26.0% |
| Cape Carteret, NC | 2,730 | 37 | 26.0% |
| Swansboro, NC | 3,339 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Port Angeles East, WA | 3,339 | 34 | 32.0% |
| South Duxbury, MA | 3,338 | 43 | 14.0% |
| Ely, MN | 3,338 | 35 | 30.0% |
| East Rockingham, NC | 3,338 | 41 | 18.0% |
| Eastlawn Gardens, PA | 3,338 | 42 | 16.0% |
| Swansboro, NC | 3,339 | 37 | 26.0% |
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