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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 44°F | 32°F | 2.1" |
| February | 25°F | 46°F | 35°F | 1.8" |
| March | 36°F | 60°F | 47°F | 3.7" |
| April | 46°F | 71°F | 58°F | 5.3" |
| May | 55°F | 78°F | 66°F | 4.5" |
| June | 65°F | 87°F | 76°F | 4.8" |
| July | 68°F | 90°F | 79°F | 2.9" |
| August | 66°F | 89°F | 77°F | 3.4" |
| September | 58°F | 82°F | 69°F | 3.9" |
| October | 46°F | 70°F | 57°F | 3.0" |
| November | 36°F | 59°F | 46°F | 2.8" |
| December | 27°F | 45°F | 35°F | 3.1" |
| Index | Eureka | Missouri | National |
| Air quality index | 54 | 97 | 42 |
| Pollution index | 3,042,530 | 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 | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Huntleigh, MO | 447 | 54 | 8.0% |
| Winchester, MO | 1,751 | 54 | 8.0% |
| Creve Coeur, MO | 18,627 | 54 | 8.0% |
| High Ridge, MO | 4,257 | 54 | 8.0% |
| Pacific, MO | 6,780 | 54 | 8.0% |
| Eureka, MO | 10,203 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Manville, NJ | 10,193 | 41 | 18.0% |
| Mount Airy, NC | 10,213 | 45 | 10.0% |
| Cedar Hills, UT | 10,190 | 46 | 8.0% |
| Rincon, GA | 10,187 | 39 | 22.0% |
| Newberry, SC | 10,219 | 43 | 14.0% |
| Eureka, MO | 10,203 | 54 | 8.0% |
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