| 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 | 50 |
| Pollution index | 500,004 | 3,347,295 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Emison, IN | 127 | 36 | 28% |
| Flat Rock, IL | 329 | 36 | 28% |
| Bruceville, IN | 540 | 36 | 28% |
| Vincennes, IN | 18,098 | 36 | 28% |
| Bridgeport, IL | 1,425 | 36 | 28% |
| Lawrenceville, IL | 4,464 | 36 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Crestline, OH | 4,463 | 41 | 18% |
| Long Hill, CT | 4,462 | 37 | 26% |
| Coleman, TX | 4,467 | 33 | 34% |
| Valdese, NC | 4,467 | 43 | 14% |
| Santa Ynez, CA | 4,468 | 44 | 12% |
| Lawrenceville, IL | 4,464 | 36 | 28% |
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