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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 | South Portland | 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. |
| Little Falls, ME | 745 | 40 | 20.0% |
| Westbrook, ME | 18,935 | 40 | 20.0% |
| Falmouth, ME | 1,877 | 40 | 20.0% |
| Portland, ME | 66,706 | 40 | 20.0% |
| Old Orchard Beach, ME | 8,952 | 40 | 20.0% |
| South Portland, ME | 25,665 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Soledad, CA | 25,667 | 37 | 26.0% |
| Moscow, ID | 25,652 | 10 | 80.0% |
| Madison, MS | 25,650 | 44 | 12.0% |
| Fairland, MD | 25,649 | 47 | 6.0% |
| Tecumseh, ON | 25,689 | n/a | |
| South Portland, ME | 25,665 | 40 | 20.0% |
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