| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 36°F | 29°F | 5.8" |
| February | 17°F | 32°F | 25°F | 2.4" |
| March | 28°F | 47°F | 36°F | 3.5" |
| April | 38°F | 58°F | 48°F | 6.9" |
| May | 47°F | 71°F | 59°F | 2.1" |
| June | 60°F | 83°F | 71°F | 4.1" |
| July | 61°F | 84°F | 72°F | 6.2" |
| August | 62°F | 83°F | 72°F | 13.1" |
| September | 55°F | 78°F | 66°F | 4.6" |
| October | 48°F | 66°F | 56°F | 4.3" |
| November | 33°F | 52°F | 43°F | 4.5" |
| December | 23°F | 36°F | 29°F | 3.6" |
| Index | Milan | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 2,498,190 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 185 |
| Days with moderate air quality | 173 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Sandusky, OH | 24,651 | 1 | 98.0% |
| Flat Rock, OH | 261 | 40 | 20.0% |
| Crystal Rock, OH | 164 | 40 | 20.0% |
| Monroeville, OH | 1,314 | 40 | 20.0% |
| Bay View, OH | 832 | 40 | 20.0% |
| Milan, OH | 1,540 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| West Salem, OH | 1,540 | 43 | 14.0% |
| Locust Grove, OK | 1,540 | 36 | 28.0% |
| Hometown, PA | 1,540 | 42 | 16.0% |
| Baxter, TN | 1,540 | 25 | 50.0% |
| Dayton, VA | 1,540 | 36 | 28.0% |
| Milan, OH | 1,540 | 50 | = 100 |
Here are the best places to live in Ohio
These are the largest cities in Ohio
See the best places to live in Milan
These are the 10 cheapest cities in Ohio