| 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 | Yarmouth | 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. |
| Gray, ME | 747 | 31 | 38.0% |
| Brunswick Station, ME | 548 | 31 | 38.0% |
| Lisbon Falls, ME | 4,079 | 31 | 38.0% |
| Topsham, ME | 6,246 | 31 | 38.0% |
| Bowdoinham, ME | 748 | 31 | 38.0% |
| Yarmouth, ME | 5,752 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Arlington, NJ | 5,751 | 34 | 32.0% |
| Ellenton, FL | 5,754 | 38 | 24.0% |
| Washingtonville, NY | 5,754 | 36 | 28.0% |
| Gustine, CA | 5,748 | 49 | 2.0% |
| Angier, NC | 5,748 | 46 | 8.0% |
| Yarmouth, ME | 5,752 | 40 | 20.0% |
Here are the best places to live in Maine
Check out the 10 safest cities in Maine
See the best places to live in Yarmouth
These are the 10 cheapest cities in Maine