| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 32°F | 6.0" |
| February | 21°F | 38°F | 29°F | 3.7" |
| March | 29°F | 50°F | 39°F | 7.0" |
| April | 40°F | 63°F | 51°F | 9.9" |
| May | 48°F | 74°F | 61°F | 3.6" |
| June | 61°F | 83°F | 72°F | 6.9" |
| July | 65°F | 85°F | 74°F | 12.6" |
| August | 65°F | 86°F | 75°F | 5.8" |
| September | 58°F | 82°F | 69°F | 1.1" |
| October | 50°F | 69°F | 58°F | 13.4" |
| November | 35°F | 55°F | 45°F | 4.9" |
| December | 26°F | 40°F | 33°F | 6.6" |
| Index | Frenchtown | New Jersey | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 3,167,110 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 86 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| 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. |
| Clinton, NJ | 2,699 | 34 | 32.0% |
| Glen Gardner, NJ | 1,554 | 34 | 32.0% |
| Asbury, NJ | 207 | 34 | 32.0% |
| Hampton, NJ | 1,182 | 34 | 32.0% |
| Annandale, NJ | 1,794 | 34 | 32.0% |
| Frenchtown, NJ | 1,366 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Milton CDP (Ulster County), NY | 1,366 | 37 | 26.0% |
| Rockaway Beach, OR | 1,366 | 18 | 64.0% |
| Miller, SD | 1,366 | 20 | 60.0% |
| Nokesville, VA | 1,366 | 47 | 6.0% |
| Tring-Jonction, QC | 1,366 | n/a | |
| Frenchtown, NJ | 1,366 | 42 | 16.0% |
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