| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 58°F | 48°F | 5.1" |
| February | 42°F | 59°F | 49°F | 4.6" |
| March | 47°F | 64°F | 55°F | 5.4" |
| April | 57°F | 73°F | 64°F | 5.4" |
| May | 66°F | 82°F | 73°F | 3.1" |
| June | 73°F | 88°F | 79°F | 4.5" |
| July | 76°F | 90°F | 82°F | 7.8" |
| August | 75°F | 88°F | 81°F | 6.5" |
| September | 71°F | 83°F | 76°F | 9.9" |
| October | 61°F | 76°F | 68°F | 8.9" |
| November | 50°F | 65°F | 57°F | 5.1" |
| December | 46°F | 62°F | 53°F | 5.2" |
| Index | Swan Quarter | North Carolina | National |
| Air quality index | 0 | 35 | 42 |
| Pollution index | 3,449,020 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 352 |
| Days with moderate air quality | 0 |
| 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. |
| Fairfield, NC | 164 | 0 | 100.0% |
| Hobucken, NC | 42 | 0 | 100.0% |
| Swan Quarter, NC | 421 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Pilot Station, AK | 421 | 31 | 38.0% |
| Newdale, ID | 421 | 43 | 14.0% |
| Virgil, IL | 421 | 42 | 16.0% |
| North Salem, IN | 421 | 54 | 8.0% |
| Grand Rivers, KY | 421 | 44 | 12.0% |
| Swan Quarter, NC | 421 | 0 | 100.0% |
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