| 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 | Dunkirk | 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. |
| Cassadaga, NY | 502 | 37 | 26.0% |
| Forestville, NY | 820 | 37 | 26.0% |
| Cherry Creek, NY | 484 | 37 | 26.0% |
| Sinclairville, NY | 624 | 37 | 26.0% |
| South Dayton, NY | 541 | 37 | 26.0% |
| Dunkirk, NY | 11,812 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Manchester, VA | 11,814 | 44 | 12.0% |
| Bucyrus, OH | 11,808 | 41 | 18.0% |
| Martinsville, IN | 11,807 | 42 | 16.0% |
| Robinson, TX | 11,806 | 38 | 24.0% |
| South Lyon, MI | 11,818 | 40 | 20.0% |
| Dunkirk, NY | 11,812 | 37 | 26.0% |
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