| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 46°F | 36°F | 7.4" |
| February | 29°F | 50°F | 38°F | 6.4" |
| March | 40°F | 63°F | 51°F | 2.9" |
| April | 46°F | 67°F | 56°F | 7.0" |
| May | 55°F | 78°F | 67°F | 4.1" |
| June | 63°F | 86°F | 74°F | 4.4" |
| July | 66°F | 88°F | 77°F | 10.3" |
| August | 69°F | 93°F | 80°F | 7.0" |
| September | 62°F | 84°F | 72°F | 10.2" |
| October | 50°F | 71°F | 59°F | 4.8" |
| November | 38°F | 60°F | 48°F | 9.4" |
| December | 28°F | 46°F | 36°F | 5.9" |
| Index | Summersville | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 510,698 | 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. |
| Raymondville, MO | 628 | 39 | 22.0% |
| Birch Tree, MO | 629 | 39 | 22.0% |
| Montier, MO | 28 | 39 | 22.0% |
| Mountain View, MO | 2,663 | 39 | 22.0% |
| Summersville, MO | 367 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| California Pines, CA | 367 | 29 | 42.0% |
| Gardner, FL | 367 | 36 | 28.0% |
| Quimby, IA | 367 | 35 | 30.0% |
| Herrick, IL | 367 | 40 | 20.0% |
| Estral Beach, MI | 367 | 1 | 98.0% |
| Summersville, MO | 367 | 39 | 22.0% |
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