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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 32°F | 24°F | 3.1" |
| February | 18°F | 34°F | 26°F | 3.0" |
| March | 31°F | 49°F | 39°F | 5.2" |
| April | 40°F | 62°F | 50°F | 4.8" |
| May | 51°F | 73°F | 61°F | 5.9" |
| June | 60°F | 82°F | 70°F | 6.7" |
| July | 64°F | 84°F | 73°F | 4.1" |
| August | 62°F | 82°F | 71°F | 7.7" |
| September | 55°F | 76°F | 65°F | 3.2" |
| October | 44°F | 64°F | 53°F | 7.3" |
| November | 33°F | 50°F | 41°F | 3.9" |
| December | 22°F | 36°F | 29°F | 3.7" |
| Index | Orland Park | Illinois | National |
| Air quality index | 55 | 41 | 42 |
| Pollution index | 1,558,070 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 121 |
| Days with moderate air quality | 227 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.070% |
| Lead | 0.090% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Elwood, IL | 2,524 | 0 | 100.0% |
| Forest View, IL | 1,312 | 55 | 10.0% |
| Ford Heights, IL | 2,705 | 55 | 10.0% |
| Steger, IL | 9,289 | 55 | 10.0% |
| Flossmoor, IL | 9,318 | 55 | 10.0% |
| Orland Park, IL | 58,380 | 55 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Des Plaines, IL | 58,316 | 55 | 10.0% |
| Margate, FL | 58,465 | 41 | 18.0% |
| Medford, MA | 58,290 | 43 | 14.0% |
| Casper, WY | 58,287 | 42 | 16.0% |
| White Plains, NY | 58,171 | 51 | 2.0% |
| Orland Park, IL | 58,380 | 55 | 10.0% |
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