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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 31°F | 21°F | 4.5" |
| February | 11°F | 33°F | 22°F | 4.0" |
| March | 20°F | 42°F | 31°F | 7.8" |
| April | 32°F | 54°F | 43°F | 11.5" |
| May | 42°F | 63°F | 52°F | 6.4" |
| June | 52°F | 76°F | 63°F | 4.6" |
| July | 57°F | 79°F | 68°F | 4.6" |
| August | 56°F | 80°F | 68°F | 5.5" |
| September | 51°F | 73°F | 62°F | 6.0" |
| October | 42°F | 61°F | 51°F | 10.7" |
| November | 30°F | 48°F | 39°F | 7.8" |
| December | 17°F | 36°F | 26°F | 7.5" |
| Index | Boothbay Harbor | Maine | National |
| Air quality index | 36 | 33 | 42 |
| Pollution index | 2,415,390 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 213 |
| Days with good air quality | 204 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Wiscasset, ME | 1,293 | 28 | 44.0% |
| Bath, ME | 8,333 | 31 | 38.0% |
| Bowdoinham, ME | 748 | 31 | 38.0% |
| Damariscotta, ME | 1,352 | 36 | 28.0% |
| Newcastle, ME | 643 | 36 | 28.0% |
| Boothbay Harbor, ME | 1,087 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Anna Maria, FL | 1,087 | 38 | 24.0% |
| Galva, KS | 1,087 | 40 | 20.0% |
| Cove Creek, NC | 1,087 | 26 | 48.0% |
| Middlesex, NC | 1,087 | 46 | 8.0% |
| Point, TX | 1,087 | 51 | 2.0% |
| Boothbay Harbor, ME | 1,087 | 36 | 28.0% |
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