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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 | Morristown | 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. |
| Peapack and Gladstone, NJ | 2,582 | 34 | 32.0% |
| Dover, NJ | 17,866 | 34 | 32.0% |
| Mount Arlington, NJ | 5,751 | 34 | 32.0% |
| Victory Gardens, NJ | 1,604 | 34 | 32.0% |
| Budd Lake, NJ | 10,444 | 34 | 32.0% |
| Morristown, NJ | 19,065 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Valle Vista, CA | 19,072 | 89 | 78.0% |
| Saint-Colomban, QC | 19,057 | n/a | |
| Sherrelwood, CO | 19,082 | 58 | 16.0% |
| Mesquite, NV | 19,087 | 44 | 12.0% |
| Phelan, CA | 19,038 | 89 | 78.0% |
| Morristown, NJ | 19,065 | 51 | 2.0% |
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