| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 40°F | 31°F | 6.8" |
| February | 27°F | 44°F | 34°F | 4.4" |
| March | 39°F | 60°F | 48°F | 3.5" |
| April | 45°F | 66°F | 55°F | 5.5" |
| May | 58°F | 78°F | 67°F | 4.3" |
| June | 66°F | 85°F | 75°F | 13.6" |
| July | 68°F | 89°F | 78°F | 5.0" |
| August | 70°F | 91°F | 80°F | 12.7" |
| September | 62°F | 83°F | 72°F | 6.1" |
| October | 50°F | 70°F | 59°F | 4.9" |
| November | 38°F | 58°F | 47°F | 4.1" |
| December | 25°F | 40°F | 32°F | 2.7" |
| Index | Smithton | 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. |
| Ionia, MO | 75 | 38 | 24.0% |
| Otterville, MO | 354 | 38 | 24.0% |
| Hughesville, MO | 206 | 38 | 24.0% |
| Pilot Grove, MO | 666 | 38 | 24.0% |
| Sedalia, MO | 21,634 | 38 | 24.0% |
| Smithton, MO | 511 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Portia, AR | 511 | 45 | 10.0% |
| Rough and Ready, CA | 511 | 44 | 12.0% |
| Juliaetta, ID | 511 | 10 | 80.0% |
| Mackay, ID | 511 | 27 | 46.0% |
| South Range, MI | 511 | 8 | 84.0% |
| Smithton, MO | 511 | 38 | 24.0% |
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