| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 32°F | 3.5" |
| February | 27°F | 44°F | 34°F | 2.0" |
| March | 39°F | 58°F | 47°F | 3.7" |
| April | 48°F | 69°F | 58°F | 7.8" |
| May | 57°F | 77°F | 66°F | 5.4" |
| June | 66°F | 86°F | 76°F | 8.3" |
| July | 68°F | 88°F | 78°F | 7.4" |
| August | 66°F | 87°F | 76°F | 7.2" |
| September | 59°F | 81°F | 69°F | 8.9" |
| October | 48°F | 70°F | 58°F | 5.6" |
| November | 38°F | 57°F | 47°F | 4.2" |
| December | 30°F | 45°F | 37°F | 4.9" |
| Index | Keyesport | 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. |
| Smithboro, IL | 215 | 40 | 20.0% |
| Mulberry Grove, IL | 847 | 40 | 20.0% |
| Vernon, IL | 94 | 43 | 14.0% |
| Carlyle, IL | 3,595 | 43 | 14.0% |
| Huey, IL | 136 | 43 | 14.0% |
| Keyesport, IL | 493 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Gustavus, AK | 493 | 20 | 60.0% |
| Clarkedale, AR | 493 | 45 | 10.0% |
| Round Valley, CA | 493 | 47 | 6.0% |
| Micanopy, FL | 493 | 35 | 30.0% |
| Woodson, IL | 493 | 40 | 20.0% |
| Keyesport, IL | 493 | 43 | 14.0% |
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