| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 28°F | 17°F | 1.7" |
| February | 6°F | 30°F | 18°F | 1.8" |
| March | 15°F | 40°F | 27°F | 2.0" |
| April | 28°F | 55°F | 41°F | 3.0" |
| May | 39°F | 68°F | 54°F | 3.9" |
| June | 48°F | 75°F | 61°F | 5.0" |
| July | 53°F | 80°F | 66°F | 4.5" |
| August | 51°F | 78°F | 64°F | 5.0" |
| September | 44°F | 72°F | 57°F | 3.0" |
| October | 35°F | 59°F | 46°F | 3.7" |
| November | 24°F | 46°F | 34°F | 2.2" |
| December | 13°F | 33°F | 23°F | 3.1" |
| Index | Mexico | Maine | National |
| Air quality index | 40 | 33 | 42 |
| Pollution index | 2,398,170 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 324 |
| Days with good air quality | 314 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Wilton, ME | 1,513 | 28 | 44.0% |
| Dixfield, ME | 1,388 | 31 | 38.0% |
| Rumford, ME | 3,931 | 40 | 20.0% |
| Mexico, ME | 1,957 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Pecatonica, IL | 1,957 | 42 | 16.0% |
| Manahawkin, NJ | 1,957 | 37 | 26.0% |
| Willow, AK | 1,956 | 31 | 38.0% |
| Elberta, AL | 1,958 | 37 | 26.0% |
| Vincent, AL | 1,956 | 38 | 24.0% |
| Mexico, ME | 1,957 | 40 | 20.0% |
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