| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 44°F | 31°F | 2.0" |
| February | 23°F | 47°F | 33°F | 2.1" |
| March | 35°F | 61°F | 46°F | 3.0" |
| April | 44°F | 71°F | 57°F | 5.7" |
| May | 53°F | 78°F | 65°F | 4.3" |
| June | 63°F | 87°F | 75°F | 4.8" |
| July | 67°F | 90°F | 78°F | 5.1" |
| August | 65°F | 89°F | 76°F | 3.9" |
| September | 57°F | 82°F | 69°F | 4.8" |
| October | 45°F | 71°F | 57°F | 3.9" |
| November | 35°F | 59°F | 46°F | 2.4" |
| December | 25°F | 45°F | 34°F | 2.7" |
| Index | Centralia | Missouri | National |
| Air quality index | 38 | 97 | 42 |
| Pollution index | 711,791 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 239 |
| Days with moderate air quality | 6 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Auxvasse, MO | 1,229 | 38 | 24.0% |
| Hallsville, MO | 1,686 | 38 | 24.0% |
| Clark, MO | 252 | 38 | 24.0% |
| Mexico, MO | 11,535 | 38 | 24.0% |
| Renick, MO | 151 | 38 | 24.0% |
| Centralia, MO | 4,260 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Medina, TN | 4,260 | 27 | 46.0% |
| Morgan, UT | 4,259 | 45 | 10.0% |
| Highlands-Baywood Park, CA | 4,261 | 43 | 14.0% |
| Cortland, IL | 4,261 | 42 | 16.0% |
| North Richmond, CA | 4,258 | 40 | 20.0% |
| Centralia, MO | 4,260 | 38 | 24.0% |
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