| 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 | Middletown | Iowa | National |
| Air quality index | 29 | 39 | 42 |
| Pollution index | 871,264 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 101 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| West Point, IA | 735 | 29 | 42.0% |
| Pontoosuc, IL | 109 | 29 | 42.0% |
| Gulf Port, IL | 21 | 29 | 42.0% |
| Danville, IA | 931 | 29 | 42.0% |
| Franklin, IA | 175 | 29 | 42.0% |
| Middletown, IA | 447 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Thorne Bay, AK | 447 | 20 | 60.0% |
| Empire, GA | 447 | 38 | 24.0% |
| Kenney, IL | 447 | 44 | 12.0% |
| Pesotum, IL | 447 | 42 | 16.0% |
| Little River, KS | 447 | 40 | 20.0% |
| Middletown, IA | 447 | 29 | 42.0% |
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