| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 34°F | 22°F | 4.8" |
| February | 9°F | 34°F | 21°F | 4.5" |
| March | 19°F | 43°F | 30°F | 8.0" |
| April | 33°F | 55°F | 43°F | 16.6" |
| May | 42°F | 65°F | 52°F | 9.1" |
| June | 54°F | 79°F | 65°F | 6.2" |
| July | 58°F | 82°F | 68°F | 8.2" |
| August | 56°F | 84°F | 68°F | 14.0" |
| September | 49°F | 76°F | 62°F | 6.3" |
| October | 42°F | 62°F | 51°F | 9.5" |
| November | 29°F | 50°F | 38°F | 8.6" |
| December | 14°F | 36°F | 25°F | 5.2" |
| Index | Lake Arrowhead | 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. |
| Milton Mills, NH | 224 | 31 | 38.0% |
| Sanbornville, NH | 808 | 31 | 38.0% |
| Union, NH | 251 | 31 | 38.0% |
| Milton, NH | 549 | 31 | 38.0% |
| Saco, ME | 20,356 | 40 | 20.0% |
| Lake Arrowhead, ME | 2,809 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Kingston Springs, TN | 2,809 | 45 | 10.0% |
| Prince Frederick, MD | 2,808 | 41 | 18.0% |
| Hokendauqua, PA | 2,808 | 42 | 16.0% |
| Luverne, AL | 2,810 | 52 | 4.0% |
| Raoul, GA | 2,810 | 37 | 26.0% |
| Lake Arrowhead, ME | 2,809 | 40 | 20.0% |