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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 34°F | 24°F | 1.9" |
| February | 19°F | 39°F | 28°F | 1.5" |
| March | 32°F | 54°F | 41°F | 3.6" |
| April | 42°F | 65°F | 52°F | 5.5" |
| May | 52°F | 75°F | 62°F | 7.8" |
| June | 63°F | 84°F | 73°F | 10.5" |
| July | 67°F | 86°F | 76°F | 5.6" |
| August | 65°F | 84°F | 74°F | 6.6" |
| September | 57°F | 79°F | 66°F | 6.8" |
| October | 44°F | 66°F | 54°F | 5.7" |
| November | 32°F | 52°F | 41°F | 4.0" |
| December | 20°F | 37°F | 27°F | 4.8" |
| Index | Missouri Valley | Iowa | National |
| Air quality index | 40 | 39 | 42 |
| Pollution index | 4,349,930 | 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 | 0.210% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.100% |
| Mercury | 0.160% |
| City | Population | Air Quality Index | National Avg. |
| Loveland, IA | 0 | 40 | 20.0% |
| Woodbine, IA | 1,391 | 40 | 20.0% |
| Weston, IA | 138 | 40 | 20.0% |
| Blair, NE | 7,830 | 40 | 20.0% |
| Modale, IA | 296 | 40 | 20.0% |
| Missouri Valley, IA | 2,610 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Hoxie, AR | 2,610 | 45 | 10.0% |
| Riverside, NY | 2,610 | 41 | 18.0% |
| Dublin, VA | 2,610 | 41 | 18.0% |
| Massanutten, VA | 2,610 | 36 | 28.0% |
| Aromas, CA | 2,609 | 37 | 26.0% |
| Missouri Valley, IA | 2,610 | 40 | 20.0% |
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