| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 35°F | 25°F | 2.6" |
| February | 16°F | 35°F | 25°F | 2.9" |
| March | 24°F | 45°F | 34°F | 3.2" |
| April | 35°F | 62°F | 48°F | 4.0" |
| May | 46°F | 73°F | 59°F | 3.4" |
| June | 56°F | 80°F | 68°F | 4.7" |
| July | 61°F | 85°F | 73°F | 4.5" |
| August | 60°F | 83°F | 71°F | 4.0" |
| September | 52°F | 77°F | 64°F | 3.4" |
| October | 43°F | 64°F | 52°F | 5.2" |
| November | 32°F | 52°F | 41°F | 3.1" |
| December | 23°F | 40°F | 31°F | 4.2" |
| Index | Tully | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 1,654,400 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 337 |
| Days with moderate air quality | 28 |
| 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 | 0.003% |
| Lead | 0.004% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Cortland, NY | 18,633 | 34 | 32.0% |
| Cortland West, NY | 1,313 | 34 | 32.0% |
| Homer, NY | 3,103 | 34 | 32.0% |
| Groton, NY | 2,048 | 34 | 32.0% |
| McGraw, NY | 1,137 | 34 | 32.0% |
| Tully, NY | 926 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Sweet Home, AR | 926 | 45 | 10.0% |
| Henderson, MN | 926 | 46 | 8.0% |
| Diamond, MO | 926 | 37 | 26.0% |
| Franklin, NE | 926 | 19 | 62.0% |
| Hauser, ID | 927 | 43 | 14.0% |
| Tully, NY | 926 | 37 | 26.0% |
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