| 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 | Topsham | Maine | National |
| Air quality index | 31 | 33 | 42 |
| Pollution index | 2,043,700 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 345 |
| Days with moderate air quality | 16 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Richmond, ME | 1,740 | 28 | 44.0% |
| Wiscasset, ME | 1,293 | 28 | 44.0% |
| Bowdoinham, ME | 748 | 31 | 38.0% |
| Brunswick, ME | 15,974 | 31 | 38.0% |
| Lewiston, ME | 36,158 | 31 | 38.0% |
| Topsham, ME | 6,246 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Aptos, CA | 6,245 | 35 | 30.0% |
| Blue Bell, PA | 6,245 | 51 | 2.0% |
| Pigeon Forge, TN | 6,247 | 44 | 12.0% |
| Plymouth Meeting, PA | 6,244 | 51 | 2.0% |
| Wailea, HI | 6,239 | 15 | 70.0% |
| Topsham, ME | 6,246 | 31 | 38.0% |
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