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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 41°F | 31°F | 2.6" |
| February | 25°F | 44°F | 33°F | 1.7" |
| March | 37°F | 58°F | 46°F | 3.9" |
| April | 47°F | 70°F | 57°F | 5.8" |
| May | 57°F | 78°F | 67°F | 5.4" |
| June | 66°F | 87°F | 76°F | 4.8" |
| July | 67°F | 88°F | 77°F | 4.2" |
| August | 66°F | 88°F | 76°F | 2.8" |
| September | 58°F | 82°F | 69°F | 3.4" |
| October | 47°F | 70°F | 58°F | 3.5" |
| November | 36°F | 57°F | 45°F | 3.4" |
| December | 29°F | 45°F | 36°F | 3.3" |
| Index | Lawrenceville | Illinois | National |
| Air quality index | 36 | 41 | 42 |
| Pollution index | 500,004 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 328 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| St. Francisville, IL | 480 | 36 | 28.0% |
| Russellville, IL | 75 | 36 | 28.0% |
| Oaktown, IN | 970 | 36 | 28.0% |
| Decker, IN | 256 | 36 | 28.0% |
| Sumner, IL | 2,916 | 36 | 28.0% |
| Lawrenceville, IL | 4,365 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Skyline View, PA | 4,365 | 44 | 12.0% |
| Clarkdale, AZ | 4,367 | 43 | 14.0% |
| Wrightwood, CA | 4,362 | 89 | 78.0% |
| Captain Cook, HI | 4,361 | 16 | 68.0% |
| Hamburg, PA | 4,369 | 42 | 16.0% |
| Lawrenceville, IL | 4,365 | 36 | 28.0% |
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