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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 36°F | 25°F | 3.2" |
| February | 15°F | 37°F | 26°F | 4.2" |
| March | 24°F | 44°F | 34°F | 4.0" |
| April | 34°F | 57°F | 45°F | 5.0" |
| May | 44°F | 67°F | 55°F | 4.5" |
| June | 53°F | 75°F | 63°F | 5.8" |
| July | 60°F | 82°F | 70°F | 4.3" |
| August | 58°F | 80°F | 69°F | 4.4" |
| September | 51°F | 74°F | 62°F | 4.1" |
| October | 41°F | 62°F | 51°F | 6.9" |
| November | 31°F | 52°F | 41°F | 4.4" |
| December | 21°F | 40°F | 30°F | 5.3" |
| Index | Cousins Island | Maine | National |
| Air quality index | 40 | 33 | 42 |
| Pollution index | 2,043,700 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 308 |
| Days with moderate air quality | 56 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.030% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Topsham, ME | 6,246 | 31 | 38.0% |
| Bath, ME | 8,333 | 31 | 38.0% |
| Brunswick, ME | 15,974 | 31 | 38.0% |
| Gray, ME | 747 | 31 | 38.0% |
| Brunswick Station, ME | 548 | 31 | 38.0% |
| Cousins Island, ME | 521 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| McArthur, CA | 521 | 42 | 16.0% |
| Hampton, FL | 521 | 35 | 30.0% |
| Seymour, IA | 521 | 39 | 22.0% |
| Golf, IL | 521 | 55 | 10.0% |
| Sun, LA | 521 | 30 | 40.0% |
| Cousins Island, ME | 521 | 40 | 20.0% |
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