| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 24°F | 2.7" |
| February | 16°F | 34°F | 24°F | 2.5" |
| March | 23°F | 44°F | 33°F | 3.3" |
| April | 35°F | 59°F | 46°F | 4.0" |
| May | 46°F | 69°F | 57°F | 3.7" |
| June | 55°F | 77°F | 65°F | 5.5" |
| July | 59°F | 81°F | 70°F | 4.5" |
| August | 58°F | 79°F | 67°F | 5.3" |
| September | 51°F | 73°F | 61°F | 3.9" |
| October | 41°F | 61°F | 50°F | 5.0" |
| November | 31°F | 49°F | 39°F | 3.2" |
| December | 22°F | 37°F | 29°F | 3.3" |
| Index | Franklin | New York | National |
| Air quality index | 27 | 43 | 42 |
| Pollution index | 1,643,670 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 349 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Oneonta, NY | 13,855 | 27 | 46.0% |
| Unadilla, NY | 913 | 27 | 46.0% |
| Delhi, NY | 3,146 | 27 | 46.0% |
| Otego, NY | 887 | 27 | 46.0% |
| Laurens, NY | 198 | 27 | 46.0% |
| Franklin, NY | 376 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Cantua Creek, CA | 376 | 50 | = 100 |
| Nichols, IA | 376 | 32 | 36.0% |
| Culdesac, ID | 376 | 29 | 42.0% |
| Eastlake, MI | 376 | 36 | 28.0% |
| Bowersville, OH | 376 | 43 | 14.0% |
| Franklin, NY | 376 | 27 | 46.0% |
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