| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 25°F | 3.2" |
| February | 19°F | 36°F | 27°F | 2.6" |
| March | 32°F | 51°F | 40°F | 3.2" |
| April | 41°F | 64°F | 51°F | 5.2" |
| May | 51°F | 74°F | 62°F | 5.3" |
| June | 61°F | 83°F | 71°F | 9.7" |
| July | 64°F | 86°F | 74°F | 5.3" |
| August | 62°F | 84°F | 73°F | 9.8" |
| September | 55°F | 79°F | 66°F | 6.1" |
| October | 44°F | 65°F | 54°F | 7.0" |
| November | 34°F | 52°F | 42°F | 3.8" |
| December | 24°F | 38°F | 31°F | 3.7" |
| Index | Momence | Illinois | National |
| Air quality index | 55 | 41 | 42 |
| Pollution index | 3,962,360 | 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 | 0.002% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.300% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Chebanse, IL | 1,208 | 0 | 100.0% |
| Sammons Point, IL | 207 | 0 | 100.0% |
| Lake Village, IN | 707 | 37 | 26.0% |
| Lake Dalecarlia, IN | 1,779 | 37 | 26.0% |
| Papineau, IL | 128 | 42 | 16.0% |
| Momence, IL | 3,051 | 55 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Barbourville, KY | 3,051 | 39 | 22.0% |
| Overton, TX | 3,051 | 36 | 28.0% |
| White Sulphur Springs, WV | 3,051 | 41 | 18.0% |
| Welcome, NC | 3,050 | 40 | 20.0% |
| New Maryland, NB | 3,050 | n/a | |
| Momence, IL | 3,051 | 55 | 10.0% |
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