| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 38°F | 28°F | 2.6" |
| February | 19°F | 40°F | 29°F | 2.6" |
| March | 28°F | 50°F | 38°F | 3.1" |
| April | 38°F | 64°F | 51°F | 3.3" |
| May | 48°F | 74°F | 60°F | 3.1" |
| June | 57°F | 80°F | 68°F | 5.7" |
| July | 62°F | 85°F | 73°F | 5.0" |
| August | 59°F | 82°F | 70°F | 5.4" |
| September | 52°F | 76°F | 63°F | 4.6" |
| October | 42°F | 66°F | 53°F | 4.4" |
| November | 32°F | 53°F | 42°F | 2.5" |
| December | 25°F | 43°F | 33°F | 3.8" |
| Index | Sussex | 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. |
| Branchville, NJ | 1,054 | 34 | 32.0% |
| Highland Lakes, NJ | 4,666 | 34 | 32.0% |
| Vernon Center, NJ | 1,462 | 34 | 32.0% |
| Milford, PA | 1,390 | 34 | 32.0% |
| Andover, NJ | 675 | 34 | 32.0% |
| Sussex, NJ | 1,836 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Woodville, CA | 1,836 | 66 | 32.0% |
| West Falmouth, MA | 1,836 | 36 | 28.0% |
| Greenock, PA | 1,836 | 56 | 12.0% |
| Laymantown, VA | 1,836 | 38 | 24.0% |
| Howey-in-the-Hills, FL | 1,837 | 39 | 22.0% |
| Sussex, NJ | 1,836 | 34 | 32.0% |
Here are the best places to live in New Jersey
See the best places to live in Sussex
Safest Cities In The US
Check out the 10 most dangerous cities in New Jersey