| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 40°F | 31°F | 5.0" |
| February | 21°F | 38°F | 29°F | 3.2" |
| March | 27°F | 49°F | 37°F | 8.8" |
| April | 39°F | 62°F | 50°F | 10.1" |
| May | 49°F | 73°F | 61°F | 2.7" |
| June | 61°F | 83°F | 72°F | 6.6" |
| July | 65°F | 85°F | 75°F | 8.4" |
| August | 65°F | 86°F | 75°F | 7.9" |
| September | 56°F | 81°F | 68°F | 2.2" |
| October | 49°F | 68°F | 58°F | 15.6" |
| November | 34°F | 55°F | 44°F | 6.5" |
| December | 26°F | 40°F | 33°F | 8.0" |
| Index | Hawthorne | 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. |
| Upper Montclair, NJ | 11,439 | 51 | 2.0% |
| Florham Park, NJ | 11,719 | 51 | 2.0% |
| Cliffside Park, NJ | 25,410 | 51 | 2.0% |
| Guttenberg, NJ | 11,284 | 51 | 2.0% |
| Cresskill, NJ | 8,701 | 51 | 2.0% |
| Hawthorne, NJ | 18,762 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Midland, ON | 18,769 | n/a | |
| Twinsburg, OH | 18,754 | 50 | = 100 |
| Seminole, FL | 18,772 | 43 | 14.0% |
| Ottawa, IL | 18,742 | 0 | 100.0% |
| Jacksonville, IL | 18,784 | 40 | 20.0% |
| Hawthorne, NJ | 18,762 | 51 | 2.0% |
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