| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 35°F | 26°F | 3.0" |
| February | 17°F | 34°F | 25°F | 2.7" |
| March | 25°F | 44°F | 34°F | 2.7" |
| April | 36°F | 59°F | 47°F | 3.6" |
| May | 47°F | 70°F | 58°F | 3.1" |
| June | 57°F | 78°F | 68°F | 4.3" |
| July | 62°F | 82°F | 72°F | 3.4" |
| August | 61°F | 81°F | 71°F | 3.9" |
| September | 54°F | 75°F | 64°F | 4.5" |
| October | 44°F | 63°F | 53°F | 5.2" |
| November | 33°F | 51°F | 42°F | 3.5" |
| December | 25°F | 39°F | 32°F | 4.2" |
| Index | Williamsville | New York | National |
| Air quality index | 39 | 43 | 42 |
| Pollution index | 1,117,680 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 308 |
| Days with moderate air quality | 57 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Sanborn, NY | 1,157 | 39 | 22.0% |
| North Tonawanda, NY | 30,338 | 39 | 22.0% |
| Billington Heights, NY | 1,503 | 39 | 22.0% |
| Clarence, NY | 2,238 | 39 | 22.0% |
| Elma Center, NY | 3,806 | 39 | 22.0% |
| Williamsville, NY | 5,194 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Ward, AR | 5,195 | 45 | 10.0% |
| Elmsford, NY | 5,197 | 51 | 2.0% |
| Grand Falls / Grand-Sault, NB | 5,197 | n/a | |
| Marshfield, MA | 5,190 | 43 | 14.0% |
| Port LaBelle, FL | 5,189 | 36 | 28.0% |
| Williamsville, NY | 5,194 | 39 | 22.0% |
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