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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 43°F | 32°F | 1.8" |
| February | 26°F | 45°F | 34°F | 1.6" |
| March | 37°F | 59°F | 47°F | 3.7" |
| April | 47°F | 70°F | 58°F | 5.3" |
| May | 56°F | 78°F | 67°F | 4.8" |
| June | 65°F | 88°F | 76°F | 4.4" |
| July | 68°F | 90°F | 79°F | 3.9" |
| August | 66°F | 89°F | 77°F | 3.1" |
| September | 58°F | 82°F | 69°F | 4.2" |
| October | 47°F | 71°F | 58°F | 3.1" |
| November | 36°F | 58°F | 46°F | 2.8" |
| December | 29°F | 45°F | 36°F | 3.1" |
| Index | Missouri Botanical Garden | St. Louis | Missouri |
| Air quality index | 54 | 54 | 97 |
| Pollution index | 8,473,050 | 8,473,050 | 1,630,255 |
| 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. |
| Columbia, IL | 10,692 | 54 | 8.0% |
| Black Jack, MO | 6,930 | 54 | 8.0% |
| Mitchell, IL | 1,233 | 54 | 8.0% |
| Brooklyn, IL | 428 | 54 | 8.0% |
| Washington Park, IL | 3,909 | 54 | 8.0% |
| St. Louis, MO | 304,709 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| St. Paul, MN | 305,877 | 46 | 8.0% |
| Cincinnati, OH | 302,687 | 54 | 8.0% |
| Pittsburgh, PA | 301,286 | 56 | 12.0% |
| Henderson, NV | 309,955 | 54 | 8.0% |
| Stockton, CA | 311,103 | 45 | 10.0% |
| St. Louis, MO | 304,709 | 54 | 8.0% |
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