| 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 | Oneonta | 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. |
| Otego, NY | 887 | 27 | 46.0% |
| Unadilla, NY | 913 | 27 | 46.0% |
| Milford, NY | 319 | 27 | 46.0% |
| Delhi, NY | 3,146 | 27 | 46.0% |
| West End, NY | 2,199 | 27 | 46.0% |
| Oneonta, NY | 13,855 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Allouez, WI | 13,853 | 36 | 28.0% |
| Gravenhurst, ON | 13,853 | n/a | |
| Royal Kunia, HI | 13,857 | 30 | 40.0% |
| Seabrook, TX | 13,849 | 52 | 4.0% |
| Alamo, CA | 13,864 | 40 | 20.0% |
| Oneonta, NY | 13,855 | 27 | 46.0% |
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