| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 56°F | 46°F | 6.9" |
| February | 39°F | 57°F | 47°F | 6.6" |
| March | 46°F | 64°F | 55°F | 6.9" |
| April | 55°F | 72°F | 63°F | 6.9" |
| May | 63°F | 78°F | 70°F | 8.1" |
| June | 71°F | 84°F | 77°F | 6.2" |
| July | 73°F | 86°F | 79°F | 11.7" |
| August | 72°F | 86°F | 78°F | 8.1" |
| September | 68°F | 82°F | 74°F | 10.0" |
| October | 57°F | 74°F | 65°F | 13.4" |
| November | 46°F | 65°F | 55°F | 8.1" |
| December | 42°F | 60°F | 50°F | 5.0" |
| Index | Southport | North Carolina | National |
| Air quality index | 34 | 35 | 42 |
| Pollution index | 4,252,890 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 348 |
| Days with good air quality | 319 |
| Days with moderate air quality | 29 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.090% |
| Lead | 0.020% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Bald Head Island, NC | 209 | 34 | 32.0% |
| Caswell Beach, NC | 578 | 34 | 32.0% |
| St. James, NC | 5,889 | 34 | 32.0% |
| Boiling Spring Lakes, NC | 6,156 | 34 | 32.0% |
| Kure Beach, NC | 2,451 | 34 | 32.0% |
| Southport, NC | 3,860 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Thompson-Nicola P (Rivers and the Peaks), BC | 3,860 | n/a | |
| Beaupré, QC | 3,861 | n/a | |
| Rock Valley, IA | 3,858 | 36 | 28.0% |
| Hansville, WA | 3,858 | 45 | 10.0% |
| Pennsburg, PA | 3,857 | 42 | 16.0% |
| Southport, NC | 3,860 | 34 | 32.0% |
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