| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 31°F | 23°F | 3.8" |
| February | 14°F | 30°F | 22°F | 2.0" |
| March | 21°F | 39°F | 30°F | 2.9" |
| April | 34°F | 55°F | 44°F | 6.9" |
| May | 42°F | 67°F | 54°F | 3.0" |
| June | 56°F | 81°F | 68°F | 3.8" |
| July | 60°F | 81°F | 70°F | 6.7" |
| August | 60°F | 81°F | 70°F | 3.3" |
| September | 52°F | 76°F | 63°F | 4.6" |
| October | 46°F | 63°F | 53°F | 4.2" |
| November | 31°F | 48°F | 40°F | 5.6" |
| December | 21°F | 33°F | 27°F | 3.7" |
| Index | Mexico | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 3,846,580 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 337 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Altmar, NY | 289 | 35 | 30.0% |
| Sandy Creek, NY | 572 | 35 | 30.0% |
| Lacona, NY | 721 | 35 | 30.0% |
| Pulaski, NY | 2,217 | 35 | 30.0% |
| Parish, NY | 540 | 37 | 26.0% |
| Mexico, NY | 1,734 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Tuckerman, AR | 1,734 | 45 | 10.0% |
| Gilman, IL | 1,734 | 42 | 16.0% |
| Rice, MN | 1,734 | 32 | 36.0% |
| Squamish-Lillooet C, BC | 1,734 | n/a | |
| Farley, IA | 1,733 | 29 | 42.0% |
| Mexico, NY | 1,734 | 37 | 26.0% |
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