| 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 | Marathon | New York | National |
| Air quality index | 34 | 43 | 42 |
| Pollution index | 1,654,400 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 358 |
| Days with moderate air quality | 7 |
| 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. |
| Homer, NY | 3,103 | 34 | 32.0% |
| McGraw, NY | 1,137 | 34 | 32.0% |
| Smithville Flats, NY | 318 | 34 | 32.0% |
| Blodgett Mills, NY | 212 | 34 | 32.0% |
| Munsons Corners, NY | 2,906 | 34 | 32.0% |
| Marathon, NY | 1,055 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Mountain Village, AK | 1,055 | 31 | 38.0% |
| Madison, AR | 1,055 | 45 | 10.0% |
| Lawton, IA | 1,055 | 35 | 30.0% |
| Neola, IA | 1,055 | 40 | 20.0% |
| Seelyville, IN | 1,055 | 45 | 10.0% |
| Marathon, NY | 1,055 | 34 | 32.0% |
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