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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 47°F | 3.4" |
| February | 37°F | 60°F | 48°F | 3.9" |
| March | 44°F | 67°F | 55°F | 3.5" |
| April | 53°F | 75°F | 64°F | 3.3" |
| May | 61°F | 81°F | 70°F | 4.6" |
| June | 70°F | 88°F | 78°F | 5.7" |
| July | 73°F | 90°F | 81°F | 7.0" |
| August | 72°F | 88°F | 79°F | 8.4" |
| September | 67°F | 84°F | 75°F | 9.2" |
| October | 56°F | 76°F | 65°F | 6.1" |
| November | 45°F | 67°F | 55°F | 4.2" |
| December | 41°F | 62°F | 50°F | 4.8" |
| Index | Castle Hayne | 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. |
| Topsail Beach, NC | 466 | 34 | 32.0% |
| Burgaw, NC | 4,101 | 34 | 32.0% |
| Silver Lake, NC | 6,146 | 34 | 32.0% |
| Hampstead, NC | 6,940 | 34 | 32.0% |
| Murraysville, NC | 16,174 | 34 | 32.0% |
| Castle Hayne, NC | 993 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Hughes, AR | 993 | 45 | 10.0% |
| Washington, KS | 993 | 32 | 36.0% |
| Rhodhiss, NC | 993 | 43 | 14.0% |
| Saddle Rock, NY | 993 | 51 | 2.0% |
| Cresson, TX | 993 | 33 | 34.0% |
| Castle Hayne, NC | 993 | 34 | 32.0% |
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