| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 4.2" |
| February | 25°F | 43°F | 34°F | 3.6" |
| March | 33°F | 52°F | 42°F | 3.9" |
| April | 44°F | 66°F | 54°F | 4.4" |
| May | 53°F | 75°F | 63°F | 4.9" |
| June | 63°F | 84°F | 72°F | 5.3" |
| July | 69°F | 89°F | 78°F | 4.5" |
| August | 66°F | 86°F | 76°F | 5.0" |
| September | 60°F | 81°F | 69°F | 3.5" |
| October | 49°F | 69°F | 58°F | 4.8" |
| November | 38°F | 58°F | 47°F | 3.1" |
| December | 31°F | 47°F | 38°F | 5.0" |
| Index | Cresskill | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 2,420,540 | 7,246,891 | 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. |
| Pleasantville, NY | 7,256 | 43 | 14.0% |
| Thornwood, NY | 4,484 | 43 | 14.0% |
| Rye Brook, NY | 9,554 | 43 | 14.0% |
| Armonk, NY | 4,440 | 43 | 14.0% |
| East Orange, NJ | 64,650 | 51 | 2.0% |
| Cresskill, NJ | 8,701 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Norman of Catawba, NC | 8,701 | 36 | 28.0% |
| Iqaluit, NU | 8,699 | n/a | |
| Castlegar, BC | 8,697 | n/a | |
| Matawan, NJ | 8,696 | 51 | 2.0% |
| Angola, IN | 8,706 | 45 | 10.0% |
| Cresskill, NJ | 8,701 | 51 | 2.0% |
Here are the best places to live in New Jersey
Most Dangerous Cities In The US
Check out the 10 safest cities in New Jersey
See the best places to live in Cresskill