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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 44°F | 34°F | 36.7" |
| February | 24°F | 39°F | 31°F | 2.9" |
| March | 31°F | 50°F | 39°F | 6.4" |
| April | 42°F | 60°F | 49°F | 9.1" |
| May | 50°F | 70°F | 59°F | 3.9" |
| June | 63°F | 82°F | 71°F | 2.5" |
| July | 67°F | 84°F | 74°F | 10.0" |
| August | 67°F | 86°F | 75°F | 5.6" |
| September | 60°F | 81°F | 69°F | 1.4" |
| October | 53°F | 68°F | 59°F | 9.8" |
| November | 39°F | 57°F | 47°F | 6.4" |
| December | 29°F | 44°F | 35°F | 5.0" |
| Index | Highlands | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 13,232,100 | 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 | 0.100% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.020% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Farmingdale, NJ | 1,307 | 41 | 18.0% |
| East Freehold, NJ | 4,640 | 41 | 18.0% |
| Belford, NJ | 2,049 | 51 | 2.0% |
| Laurence Harbor, NJ | 6,041 | 51 | 2.0% |
| North Middletown, NJ | 2,652 | 51 | 2.0% |
| Highlands, NJ | 4,746 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| West Elmira, NY | 4,745 | 35 | 30.0% |
| Guerneville, CA | 4,747 | 34 | 32.0% |
| Telford, PA | 4,747 | 42 | 16.0% |
| Dallas, NC | 4,744 | 36 | 28.0% |
| Columbia, KY | 4,748 | 40 | 20.0% |
| Highlands, NJ | 4,746 | 51 | 2.0% |
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