| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 35°F | 28°F | 1.7" |
| February | 18°F | 34°F | 27°F | 1.4" |
| March | 26°F | 44°F | 35°F | 2.0" |
| April | 36°F | 58°F | 47°F | 2.7" |
| May | 47°F | 69°F | 58°F | 3.2" |
| June | 57°F | 77°F | 68°F | 3.3" |
| July | 62°F | 81°F | 72°F | 3.9" |
| August | 61°F | 80°F | 70°F | 4.2" |
| September | 54°F | 74°F | 64°F | 4.2" |
| October | 45°F | 62°F | 53°F | 4.4" |
| November | 35°F | 52°F | 43°F | 2.9" |
| December | 27°F | 40°F | 34°F | 2.6" |
| Index | Fredonia | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 1,117,680 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Westfield, NY | 2,766 | 37 | 26.0% |
| Sinclairville, NY | 624 | 37 | 26.0% |
| Cassadaga, NY | 502 | 37 | 26.0% |
| Dunkirk, NY | 11,812 | 37 | 26.0% |
| Brocton, NY | 1,409 | 37 | 26.0% |
| Fredonia, NY | 10,311 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairview Shores, FL | 10,310 | 39 | 22.0% |
| Greencastle, IN | 10,312 | 45 | 10.0% |
| Amelia, OH | 10,308 | 54 | 8.0% |
| Hillsdale, NJ | 10,317 | 51 | 2.0% |
| Sauk Village, IL | 10,319 | 55 | 10.0% |
| Fredonia, NY | 10,311 | 37 | 26.0% |
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