| 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 | Hallsville | Missouri | National |
| Air quality index | 38 | 97 | 42 |
| Pollution index | 345,382 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Centralia, MO | 4,260 | 38 | 24.0% |
| Columbia, MO | 122,659 | 38 | 24.0% |
| Huntsdale, MO | 21 | 38 | 24.0% |
| Harrisburg, MO | 340 | 38 | 24.0% |
| Clark, MO | 252 | 38 | 24.0% |
| Hallsville, MO | 1,686 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Bernice, LA | 1,686 | 35 | 30.0% |
| Voorhees, NJ | 1,686 | 51 | 2.0% |
| Depoe Bay, OR | 1,686 | 17 | 66.0% |
| Yacolt, WA | 1,686 | 38 | 24.0% |
| Grant, AL | 1,685 | 44 | 12.0% |
| Hallsville, MO | 1,686 | 38 | 24.0% |
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