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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 45°F | 33°F | 2.4" |
| February | 25°F | 48°F | 35°F | 2.2" |
| March | 37°F | 61°F | 48°F | 3.6" |
| April | 47°F | 72°F | 59°F | 5.4" |
| May | 57°F | 80°F | 68°F | 4.6" |
| June | 67°F | 89°F | 78°F | 5.2" |
| July | 70°F | 92°F | 81°F | 4.2" |
| August | 69°F | 91°F | 79°F | 3.6" |
| September | 61°F | 84°F | 72°F | 4.3" |
| October | 48°F | 72°F | 60°F | 3.4" |
| November | 37°F | 60°F | 48°F | 3.4" |
| December | 27°F | 47°F | 37°F | 3.5" |
| Index | Charlack | Missouri | National |
| Air quality index | 54 | 97 | 42 |
| Pollution index | 8,473,050 | 1,630,255 | 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 | 0.020% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Ballwin, MO | 30,177 | 54 | 8.0% |
| Huntleigh, MO | 447 | 54 | 8.0% |
| Maplewood, MO | 8,073 | 54 | 8.0% |
| Webster Groves, MO | 22,906 | 54 | 8.0% |
| Chesterfield, MO | 47,603 | 54 | 8.0% |
| Charlack, MO | 1,924 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Los Molinos, CA | 1,924 | 41 | 18.0% |
| Albany, MO | 1,924 | 43 | 14.0% |
| Claremont, NC | 1,924 | 43 | 14.0% |
| Holiday Heights, NJ | 1,924 | 41 | 18.0% |
| Plantsville, CT | 1,923 | 41 | 18.0% |
| Charlack, MO | 1,924 | 54 | 8.0% |
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