| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 43°F | 34°F | 3.1" |
| February | 24°F | 45°F | 35°F | 2.4" |
| March | 32°F | 54°F | 42°F | 3.8" |
| April | 42°F | 66°F | 54°F | 4.2" |
| May | 51°F | 75°F | 62°F | 3.4" |
| June | 61°F | 83°F | 72°F | 5.3" |
| July | 67°F | 88°F | 77°F | 4.3" |
| August | 64°F | 85°F | 75°F | 5.0" |
| September | 58°F | 80°F | 68°F | 3.3" |
| October | 47°F | 69°F | 57°F | 4.6" |
| November | 36°F | 58°F | 46°F | 3.0" |
| December | 29°F | 49°F | 39°F | 4.8" |
| Index | Millville | New Jersey | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 6,531,830 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 297 |
| Days with moderate air quality | 61 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.020% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Fairton, NJ | 978 | 40 | 20.0% |
| Belleplain, NJ | 460 | 40 | 20.0% |
| Buena, NJ | 4,323 | 40 | 20.0% |
| Rosenhayn, NJ | 1,321 | 40 | 20.0% |
| Cedarville, NJ | 930 | 40 | 20.0% |
| Millville, NJ | 27,485 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| King, ON | 27,487 | n/a | |
| Mililani Town, HI | 27,459 | 30 | 40.0% |
| Westport, CT | 27,511 | 43 | 14.0% |
| Danvers, MA | 27,549 | 43 | 14.0% |
| Wasco, CA | 27,553 | 67 | 34.0% |
| Millville, NJ | 27,485 | 40 | 20.0% |
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