| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 43°F | 33°F | 3.8" |
| February | 25°F | 45°F | 34°F | 3.3" |
| March | 32°F | 54°F | 42°F | 3.9" |
| April | 43°F | 67°F | 54°F | 4.1" |
| May | 53°F | 76°F | 63°F | 4.5" |
| June | 63°F | 84°F | 73°F | 5.5" |
| July | 69°F | 90°F | 79°F | 4.4" |
| August | 67°F | 87°F | 77°F | 4.8" |
| September | 60°F | 81°F | 70°F | 3.2" |
| October | 49°F | 70°F | 59°F | 5.1" |
| November | 38°F | 58°F | 48°F | 3.3" |
| December | 31°F | 48°F | 39°F | 5.0" |
| Index | Harrison | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 7,391,620 | 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 | 0.070% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.020% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Avenel, NJ | 17,175 | 51 | 2.0% |
| Iselin, NJ | 17,356 | 51 | 2.0% |
| South Plainfield, NJ | 23,961 | 51 | 2.0% |
| East Orange, NJ | 64,650 | 51 | 2.0% |
| Madison, NJ | 16,647 | 51 | 2.0% |
| Harrison, NJ | 18,313 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Eloy, AZ | 18,306 | 47 | 6.0% |
| St. Marys, GA | 18,321 | 36 | 28.0% |
| Menasha, WI | 18,280 | 37 | 26.0% |
| Schofield Barracks, HI | 18,276 | 30 | 40.0% |
| White Oak, OH | 18,351 | 54 | 8.0% |
| Harrison, NJ | 18,313 | 51 | 2.0% |
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