| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 48°F | 37°F | 5.0" |
| February | 31°F | 51°F | 40°F | 3.4" |
| March | 40°F | 63°F | 51°F | 7.8" |
| April | 49°F | 71°F | 59°F | 10.1" |
| May | 56°F | 77°F | 66°F | 8.3" |
| June | 67°F | 87°F | 76°F | 7.6" |
| July | 70°F | 90°F | 79°F | 9.0" |
| August | 69°F | 89°F | 78°F | 7.9" |
| September | 61°F | 81°F | 70°F | 9.4" |
| October | 49°F | 71°F | 59°F | 9.0" |
| November | 40°F | 61°F | 50°F | 7.4" |
| December | 31°F | 50°F | 39°F | 8.7" |
| Index | Wheaton | Missouri | National |
| Air quality index | 37 | 97 | 42 |
| Pollution index | 1,360,620 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 324 |
| Days with moderate air quality | 40 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Butterfield, MO | 608 | 18 | 64.0% |
| Cassville, MO | 3,206 | 18 | 64.0% |
| Exeter, MO | 1,023 | 18 | 64.0% |
| Pierce City, MO | 1,462 | 37 | 26.0% |
| Newtonia, MO | 183 | 37 | 26.0% |
| Wheaton, MO | 502 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Madison, CA | 502 | 52 | 4.0% |
| Pomeroy, IA | 502 | 37 | 26.0% |
| Scales Mound, IL | 502 | 29 | 42.0% |
| Rothsay, MN | 502 | 33 | 34.0% |
| Glenaire, MO | 502 | 47 | 6.0% |
| Wheaton, MO | 502 | 37 | 26.0% |
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