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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 39°F | 30°F | 3.0" |
| February | 23°F | 40°F | 31°F | 2.6" |
| March | 30°F | 49°F | 39°F | 3.5" |
| April | 41°F | 62°F | 50°F | 4.2" |
| May | 50°F | 71°F | 60°F | 4.2" |
| June | 60°F | 79°F | 69°F | 5.1" |
| July | 66°F | 84°F | 74°F | 4.4" |
| August | 64°F | 82°F | 72°F | 4.2" |
| September | 57°F | 77°F | 66°F | 4.3" |
| October | 47°F | 65°F | 55°F | 5.1" |
| November | 37°F | 54°F | 45°F | 3.1" |
| December | 29°F | 44°F | 36°F | 4.5" |
| Index | Tappan | New York | National |
| Air quality index | 51 | 43 | 42 |
| Pollution index | 7,043,200 | 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 | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.030% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Croton-on-Hudson, NY | 8,121 | 36 | 28.0% |
| Mount Ivy, NY | 7,390 | 36 | 28.0% |
| Crugers, NY | 1,335 | 36 | 28.0% |
| Stony Point, NY | 13,006 | 36 | 28.0% |
| Pomona, NY | 3,058 | 36 | 28.0% |
| Tappan, NY | 7,415 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Chesterland, OH | 7,415 | 50 | = 100 |
| Connellsville, PA | 7,414 | 36 | 28.0% |
| DuBois, PA | 7,413 | 33 | 34.0% |
| Bargersville, IN | 7,417 | 54 | 8.0% |
| Swainsboro, GA | 7,418 | 47 | 6.0% |
| Tappan, NY | 7,415 | 51 | 2.0% |
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