| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 48°F | 33°F | 0.6" |
| February | 24°F | 52°F | 37°F | 1.4" |
| March | 36°F | 64°F | 49°F | 2.4" |
| April | 45°F | 73°F | 58°F | 3.6" |
| May | 54°F | 80°F | 67°F | 6.0" |
| June | 66°F | 91°F | 78°F | 5.9" |
| July | 70°F | 95°F | 82°F | 4.8" |
| August | 68°F | 93°F | 79°F | 5.8" |
| September | 59°F | 87°F | 72°F | 3.8" |
| October | 46°F | 75°F | 59°F | 2.5" |
| November | 34°F | 62°F | 47°F | 1.3" |
| December | 23°F | 48°F | 35°F | 1.3" |
| Index | Milan | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 222,900 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 301 |
| Days with moderate air quality | 64 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Danville, KS | 29 | 40 | 20.0% |
| Milton, KS | 299 | 40 | 20.0% |
| Freeport, KS | 0 | 40 | 20.0% |
| Norwich, KS | 444 | 40 | 20.0% |
| Conway Springs, KS | 1,485 | 40 | 20.0% |
| Milan, KS | 99 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Cullomburg, AL | 99 | 36 | 28.0% |
| Faunsdale, AL | 99 | 35 | 30.0% |
| Black Springs, AR | 99 | 38 | 24.0% |
| Tumacacori-Carmen, AZ | 99 | 31 | 38.0% |
| Alleghany, CA | 99 | 44 | 12.0% |
| Milan, KS | 99 | 40 | 20.0% |
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