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 | 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. |
Old Orchard Beach, ME | 8,952 | 40 | 20.0% |
Westbrook, ME | 18,935 | 40 | 20.0% |
Falmouth, ME | 1,877 | 40 | 20.0% |
Scarborough, ME | 5,268 | 40 | 20.0% |
Biddeford, ME | 21,502 | 40 | 20.0% |
Portland, ME | 66,706 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
West Des Moines, IA | 66,724 | 39 | 22.0% |
Redondo Beach, CA | 66,663 | 72 | 44.0% |
Yuba City, CA | 66,660 | 44 | 12.0% |
Oshkosh, WI | 66,753 | 36 | 28.0% |
Kenner, LA | 66,759 | 45 | 10.0% |
Portland, ME | 66,706 | 40 | 20.0% |