| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 36°F | 25°F | n/a |
| February | 18°F | 39°F | 27°F | n/a |
| March | 32°F | 55°F | 42°F | n/a |
| April | 41°F | 65°F | 52°F | n/a |
| May | 52°F | 75°F | 63°F | n/a |
| June | 63°F | 84°F | 73°F | n/a |
| July | 66°F | 87°F | 76°F | n/a |
| August | 63°F | 84°F | 73°F | n/a |
| September | 54°F | 79°F | 65°F | n/a |
| October | 43°F | 66°F | 54°F | n/a |
| November | 31°F | 53°F | 41°F | n/a |
| December | 20°F | 38°F | 28°F | n/a |
| Index | Nodaway | Iowa | National |
| Air quality index | 40 | 39 | 42 |
| Pollution index | 338,773 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| 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 | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Prescott, IA | 189 | 39 | 22.0% |
| Stanton, IA | 627 | 40 | 20.0% |
| Carbon, IA | 52 | 40 | 20.0% |
| Villisca, IA | 1,162 | 40 | 20.0% |
| Clarinda, IA | 5,371 | 40 | 20.0% |
| Nodaway, IA | 55 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Dayton, AL | 55 | 36 | 28.0% |
| Minturn, AR | 55 | 45 | 10.0% |
| Hayesville, IA | 55 | 35 | 30.0% |
| Thornburg, IA | 55 | 35 | 30.0% |
| Placerville, ID | 55 | 36 | 28.0% |
| Nodaway, IA | 55 | 40 | 20.0% |
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