| 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 | Franklin | 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. |
| Byram Center, NJ | 2,070 | 34 | 32.0% |
| Netcong, NJ | 3,285 | 34 | 32.0% |
| Lake Telemark, NJ | 1,174 | 34 | 32.0% |
| Crandon Lakes, NJ | 1,257 | 34 | 32.0% |
| Ogdensburg, NJ | 2,235 | 34 | 32.0% |
| Franklin, NJ | 4,927 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Dallas, NC | 4,928 | 36 | 28.0% |
| Smithville, TN | 4,925 | 25 | 50.0% |
| Seat Pleasant, MD | 4,929 | 47 | 6.0% |
| Holts Summit, MO | 4,929 | 39 | 22.0% |
| Kanab, UT | 4,929 | 44 | 12.0% |
| Franklin, NJ | 4,927 | 34 | 32.0% |
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