| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 40°F | 31°F | 3.0" |
| February | 23°F | 42°F | 32°F | 2.9" |
| March | 31°F | 52°F | 41°F | 3.5" |
| April | 42°F | 65°F | 52°F | 3.9" |
| May | 51°F | 74°F | 62°F | 4.0" |
| June | 60°F | 82°F | 71°F | 4.9" |
| July | 66°F | 87°F | 76°F | 4.9" |
| August | 63°F | 84°F | 73°F | 4.9" |
| September | 57°F | 78°F | 67°F | 3.7" |
| October | 46°F | 67°F | 56°F | 4.2" |
| November | 36°F | 55°F | 45°F | 2.8" |
| December | 29°F | 45°F | 36°F | 4.4" |
| Index | North Caldwell | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 2,548,930 | 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 | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Victory Gardens, NJ | 1,654 | 34 | 32.0% |
| White Meadow Lake, NJ | 9,515 | 34 | 32.0% |
| Lake Telemark, NJ | 1,174 | 34 | 32.0% |
| Hillsdale, NJ | 10,605 | 51 | 2.0% |
| Pompton Lakes, NJ | 11,276 | 51 | 2.0% |
| North Caldwell, NJ | 6,867 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Conley, GA | 6,867 | 52 | 4.0% |
| Medfield, MA | 6,867 | 43 | 14.0% |
| Gunnison, CO | 6,866 | 16 | 68.0% |
| Scottsburg, IN | 6,866 | 35 | 30.0% |
| Ellettsville, IN | 6,865 | 42 | 16.0% |
| North Caldwell, NJ | 6,867 | 51 | 2.0% |