| 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 | Westfield | 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. |
| North East, PA | 4,065 | 36 | 28.0% |
| Ripley, NY | 838 | 36 | 28.0% |
| Chautauqua, NY | 303 | 37 | 26.0% |
| Mayville, NY | 1,436 | 37 | 26.0% |
| Sherman, NY | 574 | 37 | 26.0% |
| Westfield, NY | 2,766 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Burns, OR | 2,766 | 23 | 54.0% |
| Rougemont, QC | 2,766 | n/a | |
| Loudonville, OH | 2,765 | 41 | 18.0% |
| Loxley, AL | 2,767 | 37 | 26.0% |
| Greenbriar, FL | 2,764 | 43 | 14.0% |
| Westfield, NY | 2,766 | 37 | 26.0% |
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