| 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 | Hammonton | New Jersey | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 3,463,050 | 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 | 0.002% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Egg Harbor City, NJ | 4,072 | 37 | 26.0% |
| Pomona, NJ | 7,756 | 37 | 26.0% |
| Clayton, NJ | 8,688 | 40 | 20.0% |
| Williamstown, NJ | 14,161 | 40 | 20.0% |
| Newfield, NJ | 1,502 | 40 | 20.0% |
| Hammonton, NJ | 14,046 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Dumas, TX | 14,042 | 44 | 12.0% |
| Lakeland North, WA | 14,042 | 45 | 10.0% |
| Miami Springs, FL | 14,041 | 41 | 18.0% |
| Washington, MO | 14,052 | 54 | 8.0% |
| Beauharnois, QC | 14,056 | n/a | |
| Hammonton, NJ | 14,046 | 40 | 20.0% |
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