| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 43°F | 34°F | 3.5" |
| February | 27°F | 44°F | 35°F | 2.9" |
| March | 34°F | 53°F | 42°F | 3.8" |
| April | 45°F | 65°F | 53°F | 4.4" |
| May | 54°F | 74°F | 63°F | 4.2" |
| June | 64°F | 83°F | 73°F | 4.9" |
| July | 71°F | 89°F | 79°F | 4.3" |
| August | 70°F | 86°F | 77°F | 5.0" |
| September | 64°F | 80°F | 71°F | 3.3" |
| October | 53°F | 69°F | 60°F | 5.1" |
| November | 42°F | 58°F | 49°F | 3.2" |
| December | 34°F | 48°F | 40°F | 4.9" |
| Index | Yonkers | New York | National |
| Air quality index | 51 | 43 | 42 |
| Pollution index | 2,420,540 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 169 |
| Days with moderate air quality | 180 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Cos Cob, CT | 7,065 | 43 | 14.0% |
| Chappaqua, NY | 2,628 | 43 | 14.0% |
| Pleasantville, NY | 7,256 | 43 | 14.0% |
| Thornwood, NY | 4,484 | 43 | 14.0% |
| Byram, CT | 4,855 | 43 | 14.0% |
| Yonkers, NY | 200,183 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Salt Lake City, UT | 200,133 | 51 | 2.0% |
| Huntsville, AL | 199,845 | 44 | 12.0% |
| Huntington Beach, CA | 199,778 | 72 | 44.0% |
| Grand Rapids, MI | 199,417 | 38 | 24.0% |
| Glendale, CA | 199,357 | 72 | 44.0% |
| Yonkers, NY | 200,183 | 51 | 2.0% |
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