| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 44°F | 34°F | 3.3" |
| February | 26°F | 46°F | 35°F | 2.6" |
| March | 33°F | 56°F | 44°F | 3.6" |
| April | 44°F | 68°F | 56°F | 4.0" |
| May | 54°F | 77°F | 65°F | 3.9" |
| June | 64°F | 86°F | 74°F | 4.8" |
| July | 70°F | 90°F | 79°F | 5.0" |
| August | 68°F | 87°F | 77°F | 5.8" |
| September | 61°F | 82°F | 71°F | 4.3" |
| October | 50°F | 70°F | 59°F | 4.7" |
| November | 39°F | 59°F | 48°F | 2.8" |
| December | 31°F | 49°F | 40°F | 4.7" |
| Index | Richwood | New Jersey | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 1,648,940 | 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 | 0.300% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.080% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Glassboro, NJ | 20,069 | 40 | 20.0% |
| Williamstown, NJ | 14,161 | 40 | 20.0% |
| Elmer, NJ | 1,333 | 40 | 20.0% |
| Seabrook Farms, NJ | 1,602 | 40 | 20.0% |
| Woodstown, NJ | 3,445 | 40 | 20.0% |
| Richwood, NJ | 3,967 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Midway North, TX | 3,967 | 42 | 16.0% |
| High Point, FL | 3,966 | 30 | 40.0% |
| Fort Gibson, OK | 3,966 | 5 | 90.0% |
| Coronita, CA | 3,968 | 89 | 78.0% |
| Fulton, MS | 3,968 | 39 | 22.0% |
| Richwood, NJ | 3,967 | 40 | 20.0% |
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