| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 36°F | 27°F | 5.3" |
| February | 19°F | 37°F | 27°F | 6.2" |
| March | 27°F | 45°F | 35°F | 7.3" |
| April | 37°F | 58°F | 47°F | 7.5" |
| May | 47°F | 68°F | 57°F | 7.1" |
| June | 56°F | 76°F | 65°F | 8.3" |
| July | 63°F | 83°F | 72°F | 7.9" |
| August | 60°F | 81°F | 70°F | 8.4" |
| September | 54°F | 74°F | 63°F | 8.5" |
| October | 43°F | 63°F | 52°F | 8.2" |
| November | 33°F | 52°F | 42°F | 6.9" |
| December | 24°F | 41°F | 32°F | 6.3" |
| Index | York Harbor | Maine | National |
| Air quality index | 40 | 33 | 42 |
| Pollution index | 91,790 | 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 | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Berwick, ME | 1,985 | 27 | 46.0% |
| Hampton, NH | 10,002 | 37 | 26.0% |
| Kittery, ME | 5,297 | 37 | 26.0% |
| Exeter, NH | 9,349 | 37 | 26.0% |
| Portsmouth, NH | 21,418 | 37 | 26.0% |
| York Harbor, ME | 3,484 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Venice Gardens, FL | 3,484 | 38 | 24.0% |
| Blackshear, GA | 3,484 | 26 | 48.0% |
| Rosita, TX | 3,483 | 25 | 50.0% |
| McCall, ID | 3,485 | 36 | 28.0% |
| Locust Valley, NY | 3,485 | 51 | 2.0% |
| York Harbor, ME | 3,484 | 40 | 20.0% |
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