| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 32°F | 3.4" |
| February | 23°F | 44°F | 33°F | 3.1" |
| March | 33°F | 57°F | 44°F | 4.6" |
| April | 43°F | 69°F | 56°F | 5.0" |
| May | 52°F | 77°F | 64°F | 4.0" |
| June | 61°F | 85°F | 73°F | 5.2" |
| July | 65°F | 87°F | 76°F | 4.0" |
| August | 64°F | 88°F | 76°F | 3.0" |
| September | 57°F | 81°F | 69°F | 4.1" |
| October | 45°F | 69°F | 57°F | 4.1" |
| November | 34°F | 57°F | 45°F | 3.5" |
| December | 27°F | 45°F | 36°F | 4.5" |
| Index | Aurora | Indiana | National |
| Air quality index | 54 | 56 | 50 |
| Pollution index | 23,937,200 | 3,773,618 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 156 |
| Days with moderate air quality | 198 |
| Days w/ poor A.Q. for sensitive groups | 11 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.500% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.110% |
| Lead | 0.250% |
| Mercury | 0.060% |
| City, State | Population | Air Quality Index | National Avg. |
| East Enterprise, IN | 454 | 54 | 8% |
| Milan, IN | 1,960 | 54 | 8% |
| West Harrison, IN | 356 | 54 | 8% |
| Francisville, KY | 9,452 | 54 | 8% |
| Rabbit Hash, KY | 453 | 54 | 8% |
| Aurora, IN | 3,697 | 54 | 8% |
| City, State | Population | Air Quality Index | National Avg. |
| Ajo, AZ | 3,696 | 74 | 48% |
| Lloyd Harbor, NY | 3,696 | 47 | 6% |
| Odenville, AL | 3,700 | 38 | 24% |
| Windsor, NC | 3,694 | 3 | 94% |
| Collinsville, CT | 3,693 | 39 | 22% |
| Aurora, IN | 3,697 | 54 | 8% |