| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 35°F | 26°F | 1.8" |
| February | 19°F | 37°F | 27°F | 1.7" |
| March | 34°F | 53°F | 42°F | 3.5" |
| April | 45°F | 66°F | 55°F | 5.3" |
| May | 54°F | 75°F | 64°F | 4.8" |
| June | 64°F | 84°F | 74°F | 6.7" |
| July | 67°F | 86°F | 76°F | 5.2" |
| August | 66°F | 85°F | 75°F | 6.2" |
| September | 58°F | 80°F | 68°F | 3.5" |
| October | 46°F | 65°F | 55°F | 3.9" |
| November | 37°F | 54°F | 45°F | 2.2" |
| December | 22°F | 37°F | 29°F | 3.1" |
| Index | Oakville | Iowa | National |
| Air quality index | 56 | 39 | 50 |
| Pollution index | 640,499 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 139 |
| Days with moderate air quality | 170 |
| Days w/ poor A.Q. for sensitive groups | 52 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Oquawka, IL | 1,463 | 40 | 20% |
| Mediapolis, IA | 1,536 | 40 | 20% |
| Morning Sun, IA | 906 | 56 | 12% |
| New Boston, IL | 548 | 56 | 12% |
| Wapello, IA | 1,922 | 56 | 12% |
| Oakville, IA | 157 | 56 | 12% |
| City, State | Population | Air Quality Index | National Avg. |
| Ohiowa, NE | 157 | 34 | 32% |
| Nora, IL | 157 | 32 | 36% |
| Livingston, SC | 157 | 42 | 16% |
| Aquilla, TX | 157 | 39 | 22% |
| Portal, ND | 157 | 41 | 18% |
| Oakville, IA | 157 | 56 | 12% |
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