| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 36°F | 29°F | 6.9" |
| February | 19°F | 34°F | 26°F | 3.4" |
| March | 33°F | 54°F | 42°F | 3.3" |
| April | 41°F | 65°F | 52°F | 5.8" |
| May | 52°F | 78°F | 65°F | 3.4" |
| June | 63°F | 85°F | 74°F | 6.1" |
| July | 63°F | 83°F | 73°F | 5.8" |
| August | 65°F | 86°F | 75°F | 5.4" |
| September | 57°F | 83°F | 69°F | 7.0" |
| October | 46°F | 69°F | 57°F | 5.6" |
| November | 33°F | 53°F | 42°F | 7.3" |
| December | 21°F | 35°F | 27°F | 3.7" |
| Index | Tuscola | Illinois | National |
| Air quality index | 42 | 41 | 42 |
| Pollution index | 1,494,160 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 281 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.290% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hindsboro, IL | 400 | 42 | 16.0% |
| Villa Grove, IL | 2,300 | 42 | 16.0% |
| Longview, IL | 99 | 42 | 16.0% |
| Humboldt, IL | 446 | 42 | 16.0% |
| Atwood, IL | 1,126 | 42 | 16.0% |
| Tuscola, IL | 4,599 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Medina, TX | 4,599 | 41 | 18.0% |
| Winnsboro, LA | 4,597 | 34 | 32.0% |
| Flemington, NJ | 4,601 | 41 | 18.0% |
| King George, VA | 4,601 | 47 | 6.0% |
| Columbiana, AL | 4,602 | 53 | 6.0% |
| Tuscola, IL | 4,599 | 42 | 16.0% |
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