| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 42°F | 34°F | 4.0" |
| February | 28°F | 42°F | 34°F | 3.8" |
| March | 36°F | 51°F | 42°F | 5.3" |
| April | 46°F | 65°F | 54°F | 5.0" |
| May | 54°F | 72°F | 62°F | 4.1" |
| June | 64°F | 80°F | 71°F | 6.4" |
| July | 69°F | 85°F | 77°F | 5.4" |
| August | 68°F | 84°F | 75°F | 6.9" |
| September | 62°F | 77°F | 69°F | 3.5" |
| October | 51°F | 65°F | 57°F | 8.3" |
| November | 43°F | 55°F | 49°F | 4.7" |
| December | 33°F | 45°F | 38°F | 6.7" |
| Index | Union City | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 15,202,500 | 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 | 0.010% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.050% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Englewood Cliffs, NJ | 5,349 | 51 | 2.0% |
| Singac, NJ | 4,054 | 51 | 2.0% |
| Mount Vernon, NY | 67,623 | 51 | 2.0% |
| Carlstadt, NJ | 6,158 | 51 | 2.0% |
| Hasbrouck Heights, NJ | 12,026 | 51 | 2.0% |
| Union City, NJ | 68,073 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Yorba Linda, CA | 68,103 | 89 | 78.0% |
| Rockville, MD | 68,155 | 47 | 6.0% |
| Palo Alto, CA | 67,973 | 43 | 14.0% |
| Redmond, WA | 67,959 | 45 | 10.0% |
| Gaithersburg, MD | 67,878 | 47 | 6.0% |
| Union City, NJ | 68,073 | 51 | 2.0% |
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