| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -4°F | 72°F | 35°F | n/a |
| February | 3°F | 75°F | 33°F | n/a |
| March | 12°F | 82°F | 45°F | n/a |
| April | 23°F | 90°F | 56°F | n/a |
| May | 36°F | 91°F | 64°F | n/a |
| June | 52°F | 95°F | 75°F | n/a |
| July | 54°F | 102°F | 77°F | n/a |
| August | 55°F | 102°F | 77°F | n/a |
| September | 41°F | 95°F | 69°F | n/a |
| October | 27°F | 95°F | 56°F | n/a |
| November | 16°F | 81°F | 46°F | n/a |
| December | 1°F | 66°F | 35°F | n/a |
| Index | Rosewood Heights | Illinois | National |
| Air quality index | 60 | 41 | 50 |
| Pollution index | 8,473,050 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 99 |
| Days with moderate air quality | 231 |
| Days w/ poor A.Q. for sensitive groups | 33 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Brighton, IL | 2,316 | 60 | 20% |
| East Alton, IL | 6,171 | 60 | 20% |
| Granite City, IL | 29,662 | 60 | 20% |
| Madison, IL | 3,825 | 60 | 20% |
| Pontoon Beach, IL | 5,753 | 60 | 20% |
| Rosewood Heights, IL | 4,011 | 60 | 20% |
| City, State | Population | Air Quality Index | National Avg. |
| San Joaquin, CA | 4,011 | 80 | 60% |
| Cedarville, OH | 4,011 | 42 | 16% |
| Churchville, PA | 4,012 | 40 | 20% |
| Madison, GA | 4,010 | 39 | 22% |
| Sandy Oaks, TX | 4,013 | 45 | 10% |
| Rosewood Heights, IL | 4,011 | 60 | 20% |