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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 42°F | 34°F | 6.3" |
| February | 24°F | 42°F | 32°F | 4.9" |
| March | 31°F | 50°F | 40°F | 7.3" |
| April | 46°F | 67°F | 55°F | 5.0" |
| May | 56°F | 76°F | 65°F | 9.9" |
| June | 64°F | 83°F | 73°F | 8.3" |
| July | 71°F | 87°F | 78°F | 8.3" |
| August | 67°F | 84°F | 75°F | 7.8" |
| September | 61°F | 80°F | 70°F | 4.9" |
| October | 54°F | 72°F | 62°F | 6.3" |
| November | 38°F | 56°F | 46°F | 5.9" |
| December | 33°F | 46°F | 39°F | 5.8" |
| Index | Old Bridge | New Jersey | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 9,503,730 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 83 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Dayton, NJ | 8,158 | 41 | 18.0% |
| Heathcote, NJ | 7,389 | 41 | 18.0% |
| Pleasant Plains, NJ | 627 | 41 | 18.0% |
| Finderne, NJ | 5,775 | 41 | 18.0% |
| Somerville, NJ | 12,139 | 41 | 18.0% |
| Old Bridge, NJ | 27,836 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Boisbriand, QC | 27,813 | n/a | |
| Williston, ND | 27,812 | 34 | 32.0% |
| Reisterstown, MD | 27,804 | 46 | 8.0% |
| Big Spring, TX | 27,878 | 28 | 44.0% |
| Fridley, MN | 27,789 | 46 | 8.0% |
| Old Bridge, NJ | 27,836 | 41 | 18.0% |
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