| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 42°F | 32°F | 3.7" |
| February | 25°F | 44°F | 34°F | 3.5" |
| March | 37°F | 58°F | 46°F | 5.2" |
| April | 46°F | 70°F | 57°F | 8.7" |
| May | 54°F | 77°F | 65°F | 6.1" |
| June | 63°F | 87°F | 74°F | 8.3" |
| July | 66°F | 89°F | 77°F | 8.1" |
| August | 64°F | 88°F | 75°F | 11.0" |
| September | 57°F | 81°F | 68°F | 5.5" |
| October | 45°F | 70°F | 56°F | 5.6" |
| November | 34°F | 56°F | 44°F | 7.5" |
| December | 28°F | 45°F | 36°F | 6.9" |
| Index | Keenes | Illinois | National |
| Air quality index | 43 | 41 | 42 |
| Pollution index | 647,280 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 344 |
| Days with good air quality | 269 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fairfield, IL | 4,912 | 43 | 14.0% |
| Mount Vernon, IL | 14,769 | 43 | 14.0% |
| Belle Rive, IL | 378 | 43 | 14.0% |
| Dahlgren, IL | 699 | 43 | 14.0% |
| Jeffersonville, IL | 333 | 43 | 14.0% |
| Keenes, IL | 53 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Takotna, AK | 53 | 31 | 38.0% |
| Penton, AL | 53 | 38 | 24.0% |
| Beaver, AR | 53 | 18 | 64.0% |
| LaGrange, AR | 53 | 45 | 10.0% |
| Mohawk Vista, CA | 53 | 44 | 12.0% |
| Keenes, IL | 53 | 43 | 14.0% |
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