| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 30°F | 24°F | 2.1" |
| February | 17°F | 30°F | 23°F | 2.4" |
| March | 26°F | 42°F | 33°F | 2.5" |
| April | 37°F | 56°F | 46°F | 3.3" |
| May | 48°F | 67°F | 57°F | 7.0" |
| June | 56°F | 73°F | 64°F | 7.2" |
| July | 60°F | 77°F | 68°F | 6.9" |
| August | 58°F | 75°F | 66°F | 5.3" |
| September | 52°F | 70°F | 60°F | 5.7" |
| October | 43°F | 58°F | 49°F | 4.7" |
| November | 33°F | 46°F | 39°F | 2.9" |
| December | 25°F | 36°F | 30°F | 2.8" |
| Index | Mayville | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 3,205,550 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 337 |
| Days with moderate air quality | 27 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.170% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Ripley, NY | 838 | 36 | 28.0% |
| Chautauqua, NY | 303 | 37 | 26.0% |
| Sherman, NY | 574 | 37 | 26.0% |
| Sinclairville, NY | 624 | 37 | 26.0% |
| Jamestown, NY | 29,290 | 37 | 26.0% |
| Mayville, NY | 1,436 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Carbondale, KS | 1,436 | 41 | 18.0% |
| Webb, AL | 1,437 | 35 | 30.0% |
| Diaz, AR | 1,435 | 45 | 10.0% |
| LeChee, AZ | 1,435 | 45 | 10.0% |
| Lakeshire, MO | 1,435 | 54 | 8.0% |
| Mayville, NY | 1,436 | 37 | 26.0% |
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