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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 | Spotswood | New Jersey | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 5,618,710 | 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 | 0.004% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.040% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Clyde, NJ | 220 | 41 | 18.0% |
| Griggstown, NJ | 886 | 41 | 18.0% |
| Kingston, NJ | 995 | 41 | 18.0% |
| Rocky Hill, NJ | 677 | 41 | 18.0% |
| Bradley Gardens, NJ | 15,283 | 41 | 18.0% |
| Spotswood, NJ | 8,512 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Mammoth Lakes, CA | 8,511 | 47 | 6.0% |
| Dry Run, OH | 8,514 | 54 | 8.0% |
| Delavan, WI | 8,509 | 37 | 26.0% |
| Temple Hills, MD | 8,508 | 47 | 6.0% |
| Roxboro, NC | 8,517 | 44 | 12.0% |
| Spotswood, NJ | 8,512 | 41 | 18.0% |
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