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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 5.1" |
| February | 20°F | 40°F | 29°F | 3.4" |
| March | 29°F | 50°F | 38°F | 3.8" |
| April | 39°F | 64°F | 51°F | 4.0" |
| May | 49°F | 73°F | 61°F | 4.1" |
| June | 58°F | 80°F | 68°F | 5.3" |
| July | 63°F | 85°F | 73°F | 6.2" |
| August | 60°F | 82°F | 70°F | 5.8" |
| September | 54°F | 76°F | 64°F | 4.5" |
| October | 43°F | 65°F | 53°F | 4.8" |
| November | 33°F | 53°F | 43°F | 2.9" |
| December | 27°F | 43°F | 34°F | 4.8" |
| Index | Stanhope | New Jersey | National |
| Air quality index | 34 | 45 | 42 |
| Pollution index | 3,291,140 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 340 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Chester, NJ | 1,514 | 34 | 32.0% |
| Kenvil, NJ | 1,934 | 34 | 32.0% |
| Netcong, NJ | 3,167 | 34 | 32.0% |
| Upper Pohatcong, NJ | 1,774 | 34 | 32.0% |
| Lake Telemark, NJ | 1,133 | 34 | 32.0% |
| Stanhope, NJ | 3,327 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Three Hills, AB | 3,327 | n/a | |
| Cottondale, AL | 3,325 | 35 | 30.0% |
| Lowville, NY | 3,329 | 35 | 30.0% |
| Port Hadlock-Irondale, WA | 3,329 | 34 | 32.0% |
| Manor, PA | 3,324 | 56 | 12.0% |
| Stanhope, NJ | 3,327 | 34 | 32.0% |
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