| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 43°F | 34°F | 2.0" |
| February | 28°F | 46°F | 36°F | 2.7" |
| March | 38°F | 59°F | 47°F | 3.6" |
| April | 48°F | 71°F | 58°F | 6.1" |
| May | 57°F | 78°F | 67°F | 4.7" |
| June | 66°F | 88°F | 76°F | 3.8" |
| July | 67°F | 88°F | 76°F | 5.7" |
| August | 65°F | 87°F | 75°F | 2.8" |
| September | 57°F | 82°F | 68°F | 3.2" |
| October | 46°F | 71°F | 57°F | 4.2" |
| November | 36°F | 57°F | 46°F | 4.1" |
| December | 30°F | 46°F | 37°F | 2.7" |
| Index | Crossville | Illinois | National |
| Air quality index | 45 | 41 | 50 |
| Pollution index | 4,489,340 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 244 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.080% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.050% |
| City, State | Population | Air Quality Index | National Avg. |
| Albion, IL | 2,208 | 36 | 28% |
| Keensburg, IL | 104 | 36 | 28% |
| Browns, IL | 112 | 36 | 28% |
| Golden Gate, IL | 65 | 43 | 14% |
| Norris City, IL | 1,301 | 43 | 14% |
| Crossville, IL | 801 | 45 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Sunset Valley, TX | 801 | 44 | 12% |
| Matinecock, NY | 801 | 51 | 2% |
| Greenbush, MN | 801 | 33 | 34% |
| Rolling Fields, KY | 801 | 49 | 2% |
| Deweyville, TX | 801 | 45 | 10% |
| Crossville, IL | 801 | 45 | 10% |
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