| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 4.5" |
| February | 19°F | 35°F | 27°F | 3.6" |
| March | 31°F | 49°F | 39°F | 4.4" |
| April | 40°F | 62°F | 50°F | 5.4" |
| May | 50°F | 72°F | 60°F | 6.5" |
| June | 60°F | 81°F | 70°F | 5.8" |
| July | 64°F | 84°F | 74°F | 8.0" |
| August | 63°F | 82°F | 72°F | 7.5" |
| September | 56°F | 76°F | 65°F | 5.4" |
| October | 45°F | 64°F | 54°F | 6.2" |
| November | 33°F | 51°F | 42°F | 5.4" |
| December | 24°F | 38°F | 31°F | 3.8" |
| Index | Country Club Hills | Illinois | National |
| Air quality index | 60 | 41 | 50 |
| Pollution index | 1,558,070 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 72 |
| Days with moderate air quality | 281 |
| Days w/ poor A.Q. for sensitive groups | 11 |
| 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, State | Population | Air Quality Index | National Avg. |
| Blue Island, IL | 22,446 | 60 | 20% |
| Burr Ridge, IL | 10,736 | 60 | 20% |
| Chicago Ridge, IL | 14,368 | 60 | 20% |
| Darien, IL | 22,232 | 60 | 20% |
| Evergreen Park, IL | 19,849 | 60 | 20% |
| Country Club Hills, IL | 16,794 | 60 | 20% |
| City, State | Population | Air Quality Index | National Avg. |
| Fairview Heights, IL | 16,793 | 60 | 20% |
| Artesia, CA | 16,789 | 74 | 48% |
| Fort Leonard Wood, MO | 16,800 | 37 | 26% |
| Fayetteville, GA | 16,780 | 52 | 4% |
| Mount Vernon, OH | 16,777 | 36 | 28% |
| Country Club Hills, IL | 16,794 | 60 | 20% |