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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 40°F | 31°F | 3.0" |
| February | 23°F | 42°F | 32°F | 2.9" |
| March | 31°F | 52°F | 41°F | 3.5" |
| April | 42°F | 65°F | 52°F | 3.9" |
| May | 51°F | 74°F | 62°F | 4.0" |
| June | 60°F | 82°F | 71°F | 4.9" |
| July | 66°F | 87°F | 76°F | 4.9" |
| August | 63°F | 84°F | 73°F | 4.9" |
| September | 57°F | 78°F | 67°F | 3.7" |
| October | 46°F | 67°F | 56°F | 4.2" |
| November | 36°F | 55°F | 45°F | 2.8" |
| December | 29°F | 45°F | 36°F | 4.4" |
| Index | Morris Plains | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 8,169,930 | 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 | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Budd Lake, NJ | 10,444 | 34 | 32.0% |
| Hopatcong, NJ | 14,228 | 34 | 32.0% |
| Netcong, NJ | 3,167 | 34 | 32.0% |
| Wharton, NJ | 6,458 | 34 | 32.0% |
| Mendham, NJ | 4,880 | 34 | 32.0% |
| Morris Plains, NJ | 5,888 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Riverside, MD | 5,888 | 46 | 8.0% |
| Somerset, PA | 5,888 | 36 | 28.0% |
| St. James, NC | 5,889 | 34 | 32.0% |
| Attalla, AL | 5,885 | 43 | 14.0% |
| South Lebanon, OH | 5,885 | 54 | 8.0% |
| Morris Plains, NJ | 5,888 | 51 | 2.0% |
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