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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 4.6" |
| February | 27°F | 45°F | 35°F | 2.4" |
| March | 39°F | 58°F | 48°F | 3.7" |
| April | 48°F | 69°F | 58°F | 6.6" |
| May | 57°F | 77°F | 66°F | 10.0" |
| June | 66°F | 86°F | 76°F | 8.8" |
| July | 69°F | 88°F | 78°F | 6.8" |
| August | 67°F | 87°F | 76°F | 10.7" |
| September | 59°F | 81°F | 69°F | 7.4" |
| October | 48°F | 70°F | 58°F | 9.0" |
| November | 38°F | 57°F | 47°F | 6.5" |
| December | 30°F | 45°F | 37°F | 7.7" |
| Index | Prairie du Rocher | Illinois | National |
| Air quality index | 54 | 41 | 42 |
| Pollution index | 753,473 | 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 | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Ste. Genevieve, MO | 4,396 | 54 | 8.0% |
| Chester, IL | 8,264 | 54 | 8.0% |
| Kaskaskia, IL | 29 | 54 | 8.0% |
| St. Mary, MO | 261 | 54 | 8.0% |
| Ellis Grove, IL | 316 | 54 | 8.0% |
| Prairie du Rocher, IL | 441 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Norman, AR | 441 | 38 | 24.0% |
| French Gulch, CA | 441 | 42 | 16.0% |
| Sierra Brooks, CA | 441 | 44 | 12.0% |
| Callender, IA | 441 | 37 | 26.0% |
| Farragut, IA | 441 | 40 | 20.0% |
| Prairie du Rocher, IL | 441 | 54 | 8.0% |
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