| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 37°F | 28°F | 2.1" |
| February | 21°F | 38°F | 29°F | 2.0" |
| March | 34°F | 54°F | 43°F | 3.0" |
| April | 44°F | 66°F | 55°F | 4.3" |
| May | 54°F | 74°F | 63°F | 3.7" |
| June | 64°F | 84°F | 74°F | 6.0" |
| July | 66°F | 86°F | 76°F | 4.5" |
| August | 66°F | 86°F | 75°F | 4.2" |
| September | 57°F | 79°F | 67°F | 4.3" |
| October | 45°F | 64°F | 54°F | 3.9" |
| November | 36°F | 54°F | 44°F | 2.7" |
| December | 23°F | 38°F | 29°F | 2.4" |
| Index | Ewing | Missouri | National |
| Air quality index | 41 | 97 | 42 |
| Pollution index | 425,218 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 208 |
| Days with moderate air quality | 33 |
| 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 | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Palmyra, MO | 3,744 | 41 | 18.0% |
| Monticello, MO | 112 | 41 | 18.0% |
| Canton, MO | 2,545 | 41 | 18.0% |
| Newark, MO | 69 | 41 | 18.0% |
| La Belle, MO | 814 | 41 | 18.0% |
| Ewing, MO | 440 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Bootjack, CA | 440 | 48 | 4.0% |
| Breda, IA | 440 | 37 | 26.0% |
| Clearfield, IA | 440 | 39 | 22.0% |
| Natoma, KS | 440 | 15 | 70.0% |
| Kingsley, KY | 440 | 49 | 2.0% |
| Ewing, MO | 440 | 41 | 18.0% |