| 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 | 32 | 39 | 50 |
| Pollution index | 640,499 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 300 |
| Days with moderate air quality | 65 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| Mediapolis, IA | 1,536 | 29 | 42% |
| Oquawka, IL | 1,463 | 29 | 42% |
| Keithsburg, IL | 558 | 32 | 36% |
| Grandview, IA | 449 | 32 | 36% |
| Seaton, IL | 205 | 32 | 36% |
| Oakville, IA | 157 | 32 | 36% |
| City, State | Population | Air Quality Index | National Avg. |
| Creston, NE | 157 | 31 | 38% |
| Gravity, IA | 157 | 43 | 14% |
| Clayville, RI | 157 | 44 | 12% |
| Filer City, MI | 157 | 36 | 28% |
| Mineral, WA | 157 | 20 | 60% |
| Oakville, IA | 157 | 32 | 36% |
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