| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 39°F | 30°F | 9.7" |
| February | 26°F | 43°F | 34°F | 4.5" |
| March | 39°F | 60°F | 49°F | 4.2" |
| April | 45°F | 66°F | 56°F | 5.1" |
| May | 58°F | 78°F | 68°F | 5.6" |
| June | 66°F | 85°F | 75°F | 12.7" |
| July | 68°F | 89°F | 79°F | 5.4" |
| August | 70°F | 91°F | 80°F | 10.4" |
| September | 61°F | 83°F | 71°F | 7.1" |
| October | 49°F | 70°F | 59°F | 9.0" |
| November | 36°F | 58°F | 46°F | 4.7" |
| December | 24°F | 39°F | 31°F | 2.9" |
| Index | Osceola | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 946,402 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 322 |
| Days with moderate air quality | 43 |
| 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. |
| Vista, MO | 45 | 39 | 22.0% |
| Collins, MO | 235 | 39 | 22.0% |
| Gerster, MO | 20 | 39 | 22.0% |
| Weaubleau, MO | 633 | 39 | 22.0% |
| Roscoe, MO | 118 | 39 | 22.0% |
| Osceola, MO | 1,235 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Brilliant, AL | 1,235 | 37 | 26.0% |
| Dilkon, AZ | 1,235 | 45 | 10.0% |
| Kaaawa, HI | 1,235 | 30 | 40.0% |
| Woodward, IA | 1,235 | 37 | 26.0% |
| Coleman, MI | 1,235 | 26 | 48.0% |
| Osceola, MO | 1,235 | 39 | 22.0% |
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