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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 46°F | 35°F | 3.6" |
| February | 24°F | 47°F | 36°F | 3.4" |
| March | 31°F | 56°F | 43°F | 4.3" |
| April | 41°F | 67°F | 53°F | 3.8" |
| May | 50°F | 75°F | 62°F | 4.0" |
| June | 61°F | 84°F | 72°F | 4.5" |
| July | 67°F | 89°F | 77°F | 5.5" |
| August | 64°F | 87°F | 75°F | 5.0" |
| September | 58°F | 81°F | 69°F | 4.1" |
| October | 47°F | 70°F | 58°F | 5.3" |
| November | 36°F | 60°F | 48°F | 3.5" |
| December | 30°F | 51°F | 40°F | 5.8" |
| Index | Northfield | New Jersey | National |
| Air quality index | 37 | 45 | 42 |
| Pollution index | 7,130,990 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 328 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.030% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Smithville, NJ | 8,861 | 37 | 26.0% |
| Linwood, NJ | 6,719 | 37 | 26.0% |
| Pleasantville, NJ | 20,226 | 37 | 26.0% |
| Strathmere, NJ | 59 | 37 | 26.0% |
| Absecon, NJ | 8,471 | 37 | 26.0% |
| Northfield, NJ | 8,088 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Bellevue, PA | 8,088 | 56 | 12.0% |
| Garden City Park, NY | 8,087 | 51 | 2.0% |
| Oak Brook, IL | 8,085 | 55 | 10.0% |
| Ellsworth, ME | 8,085 | 31 | 38.0% |
| Oroville East, CA | 8,093 | 46 | 8.0% |
| Northfield, NJ | 8,088 | 37 | 26.0% |
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