| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 30°F | 19°F | 4.5" |
| February | 11°F | 31°F | 20°F | 2.4" |
| March | 21°F | 42°F | 29°F | 5.1" |
| April | 34°F | 54°F | 43°F | 12.1" |
| May | 43°F | 63°F | 52°F | 6.0" |
| June | 54°F | 78°F | 64°F | 3.0" |
| July | 59°F | 81°F | 69°F | 3.2" |
| August | 57°F | 80°F | 67°F | 6.6" |
| September | 51°F | 74°F | 61°F | 5.5" |
| October | 43°F | 60°F | 50°F | 17.1" |
| November | 30°F | 46°F | 36°F | 9.0" |
| December | 17°F | 33°F | 23°F | 4.6" |
| Index | Oakland | Maine | National |
| Air quality index | 28 | 33 | 42 |
| Pollution index | 3,644,290 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 356 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Clinton, ME | 1,227 | 28 | 44.0% |
| Fairfield, ME | 2,298 | 28 | 44.0% |
| Waterville, ME | 16,623 | 28 | 44.0% |
| Norridgewock, ME | 1,272 | 28 | 44.0% |
| Winslow, ME | 4,908 | 28 | 44.0% |
| Oakland, ME | 2,324 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Berkeley Lake, GA | 2,324 | 52 | 4.0% |
| Triana, AL | 2,323 | 44 | 12.0% |
| Spiro, OK | 2,323 | 36 | 28.0% |
| East Bernard, TX | 2,323 | 52 | 4.0% |
| Brewster, WA | 2,323 | 24 | 52.0% |
| Oakland, ME | 2,324 | 28 | 44.0% |
Here are the best places to live in Maine
See the best places to live in Oakland
Check out the 10 most dangerous cities in Maine
These are the 10 cheapest cities in Maine