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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 41°F | 33°F | 9.0" |
| February | 25°F | 43°F | 33°F | 4.8" |
| March | 36°F | 60°F | 47°F | 3.9" |
| April | 44°F | 68°F | 55°F | 4.3" |
| May | 56°F | 80°F | 67°F | 4.3" |
| June | 65°F | 87°F | 76°F | 5.8" |
| July | 66°F | 89°F | 77°F | 3.9" |
| August | 69°F | 91°F | 79°F | 4.6" |
| September | 60°F | 85°F | 71°F | 4.9" |
| October | 48°F | 71°F | 59°F | 3.7" |
| November | 36°F | 58°F | 46°F | 7.6" |
| December | 25°F | 40°F | 32°F | 2.5" |
| Index | Carrollton | Illinois | National |
| Air quality index | 54 | 41 | 42 |
| Pollution index | 1,150,670 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 134 |
| Days with moderate air quality | 221 |
| Days w/ poor A.Q. for sensitive groups | 8 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Greenfield, IL | 1,481 | 40 | 20.0% |
| White Hall, IL | 2,356 | 40 | 20.0% |
| Hillview, IL | 161 | 40 | 20.0% |
| Roodhouse, IL | 1,656 | 40 | 20.0% |
| Pearl, IL | 98 | 41 | 18.0% |
| Carrollton, IL | 2,590 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Pleasant Ridge, MI | 2,589 | 56 | 12.0% |
| Barnesville, MN | 2,589 | 33 | 34.0% |
| Shawnee Hills, OH | 2,589 | 43 | 14.0% |
| Cross City, FL | 2,591 | 35 | 30.0% |
| Kamas, UT | 2,591 | 46 | 8.0% |
| Carrollton, IL | 2,590 | 54 | 8.0% |
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