| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 38°F | 27°F | 1.2" |
| February | 22°F | 41°F | 30°F | 1.2" |
| March | 34°F | 55°F | 43°F | 1.6" |
| April | 44°F | 67°F | 55°F | 3.9" |
| May | 54°F | 76°F | 64°F | 4.5" |
| June | 64°F | 85°F | 74°F | 5.6" |
| July | 67°F | 88°F | 77°F | 3.9" |
| August | 65°F | 86°F | 75°F | 3.8" |
| September | 57°F | 80°F | 68°F | 3.0" |
| October | 46°F | 69°F | 57°F | 2.8" |
| November | 34°F | 54°F | 44°F | 2.1" |
| December | 25°F | 41°F | 32°F | 1.9" |
| Index | Bowen | Illinois | National |
| Air quality index | 34 | 41 | 50 |
| Pollution index | 3,988,710 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 304 |
| Days with good air quality | 296 |
| Days with moderate air quality | 8 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Clayton, IL | 607 | 34 | 32% |
| Golden, IL | 643 | 34 | 32% |
| Coatsburg, IL | 155 | 34 | 32% |
| La Prairie, IL | 68 | 34 | 32% |
| Camp Point, IL | 1,135 | 34 | 32% |
| Bowen, IL | 470 | 34 | 32% |
| City, State | Population | Air Quality Index | National Avg. |
| Green Ridge, MO | 470 | 375 | 650% |
| Stapleton, GA | 470 | 42 | 16% |
| McGregor, MN | 470 | 29 | 42% |
| Ohio, IL | 470 | 1 | 98% |
| Manorville, PA | 470 | 36 | 28% |
| Bowen, IL | 470 | 34 | 32% |