| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 60°F | 47°F | 4.9" |
| February | 37°F | 62°F | 49°F | 5.9" |
| March | 44°F | 69°F | 56°F | 5.1" |
| April | 52°F | 77°F | 64°F | 4.3" |
| May | 59°F | 82°F | 70°F | 6.7" |
| June | 69°F | 89°F | 78°F | 7.2" |
| July | 72°F | 92°F | 81°F | 6.9" |
| August | 72°F | 90°F | 80°F | 8.8" |
| September | 66°F | 85°F | 75°F | 12.9" |
| October | 54°F | 77°F | 65°F | 10.5" |
| November | 44°F | 69°F | 55°F | 8.6" |
| December | 39°F | 63°F | 50°F | 7.0" |
| Index | Wilmington | 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. |
| Bolivia, NC | 177 | 34 | 32.0% |
| Silver Lake, NC | 6,146 | 34 | 32.0% |
| Castle Hayne, NC | 993 | 34 | 32.0% |
| Leland, NC | 21,903 | 34 | 32.0% |
| Northwest, NC | 778 | 34 | 32.0% |
| Wilmington, NC | 122,162 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Hartford, CT | 122,549 | 41 | 18.0% |
| Odessa, TX | 122,630 | 28 | 44.0% |
| Columbia, MO | 122,659 | 38 | 24.0% |
| Victorville, CA | 122,958 | 89 | 78.0% |
| Vallejo, CA | 121,275 | 40 | 20.0% |
| Wilmington, NC | 122,162 | 34 | 32.0% |
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