| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 41°F | 31°F | 2.8" |
| February | 22°F | 43°F | 31°F | 2.3" |
| March | 30°F | 53°F | 41°F | 3.7" |
| April | 39°F | 66°F | 52°F | 4.0" |
| May | 49°F | 75°F | 62°F | 3.7" |
| June | 58°F | 83°F | 70°F | 5.3" |
| July | 63°F | 87°F | 75°F | 5.3" |
| August | 61°F | 85°F | 72°F | 5.5" |
| September | 55°F | 79°F | 66°F | 3.6" |
| October | 43°F | 68°F | 55°F | 4.5" |
| November | 33°F | 56°F | 44°F | 3.0" |
| December | 27°F | 46°F | 36°F | 4.6" |
| Index | Long Valley | New Jersey | National |
| Air quality index | 34 | 45 | 42 |
| Pollution index | 3,167,110 | 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 | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Annandale, NJ | 1,794 | 34 | 32.0% |
| Hampton, NJ | 1,182 | 34 | 32.0% |
| Washington, NJ | 6,475 | 34 | 32.0% |
| Byram Center, NJ | 2,017 | 34 | 32.0% |
| Hopatcong, NJ | 14,228 | 34 | 32.0% |
| Long Valley, NJ | 2,327 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Rio Verde, AZ | 2,327 | 74 | 48.0% |
| Sylvania, GA | 2,327 | 47 | 6.0% |
| Central Okanagan J, BC | 2,327 | n/a | |
| Stevenson, AL | 2,326 | 39 | 22.0% |
| Rangely, CO | 2,326 | 49 | 2.0% |
| Long Valley, NJ | 2,327 | 34 | 32.0% |
Here are the best places to live in New Jersey
Safest Cities In The US
See the best places to live in Long Valley
These are the 10 cheapest cities in New Jersey