| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 30°F | 3.2" |
| February | 24°F | 45°F | 33°F | 4.1" |
| March | 37°F | 59°F | 46°F | 5.9" |
| April | 46°F | 68°F | 56°F | 9.3" |
| May | 55°F | 76°F | 65°F | 7.4" |
| June | 65°F | 86°F | 75°F | 9.6" |
| July | 69°F | 89°F | 78°F | 12.2" |
| August | 66°F | 88°F | 76°F | 9.2" |
| September | 58°F | 80°F | 68°F | 8.8" |
| October | 47°F | 69°F | 57°F | 8.6" |
| November | 36°F | 57°F | 46°F | 7.2" |
| December | 26°F | 44°F | 34°F | 6.6" |
| Index | Houstonia | Missouri | National |
| Air quality index | 38 | 97 | 42 |
| Pollution index | 2,921,360 | 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 | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.070% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| La Monte, MO | 1,046 | 38 | 24.0% |
| Marshall, MO | 12,920 | 38 | 24.0% |
| Sedalia, MO | 21,634 | 38 | 24.0% |
| Sweet Springs, MO | 1,432 | 38 | 24.0% |
| Hughesville, MO | 206 | 38 | 24.0% |
| Houstonia, MO | 246 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Sanford, AL | 246 | 35 | 30.0% |
| Garland, AR | 246 | 39 | 22.0% |
| Del Muerto, AZ | 246 | 17 | 66.0% |
| Harvel, IL | 246 | 40 | 20.0% |
| Fort Peck, MT | 246 | 34 | 32.0% |
| Houstonia, MO | 246 | 38 | 24.0% |
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