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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 31°F | 22°F | 2.8" |
| February | 14°F | 33°F | 23°F | 3.6" |
| March | 23°F | 40°F | 31°F | 2.6" |
| April | 35°F | 54°F | 44°F | 5.5" |
| May | 44°F | 63°F | 53°F | 5.6" |
| June | 54°F | 72°F | 62°F | 5.5" |
| July | 59°F | 78°F | 68°F | 4.3" |
| August | 58°F | 77°F | 67°F | 3.7" |
| September | 51°F | 70°F | 60°F | 3.4" |
| October | 40°F | 59°F | 49°F | 7.1" |
| November | 32°F | 49°F | 40°F | 6.1" |
| December | 20°F | 37°F | 28°F | 4.3" |
| Index | Freeport | 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% |
| Bowdoinham, ME | 748 | 31 | 38.0% |
| Brunswick, ME | 15,974 | 31 | 38.0% |
| Gray, ME | 747 | 31 | 38.0% |
| Freeport, ME | 1,879 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Kersey, CO | 1,879 | 45 | 10.0% |
| Southport, IN | 1,879 | 54 | 8.0% |
| Addison, NY | 1,879 | 35 | 30.0% |
| Ellaville, GA | 1,880 | 39 | 22.0% |
| Durant, IA | 1,878 | 32 | 36.0% |
| Freeport, ME | 1,879 | 40 | 20.0% |
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