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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 33°F | 21°F | 0.7" |
| February | 13°F | 38°F | 24°F | 0.8" |
| March | 26°F | 53°F | 38°F | 1.5" |
| April | 37°F | 66°F | 51°F | 3.5" |
| May | 48°F | 77°F | 62°F | 4.2" |
| June | 59°F | 86°F | 72°F | 4.9" |
| July | 63°F | 89°F | 76°F | 3.5" |
| August | 60°F | 86°F | 73°F | 5.6" |
| September | 51°F | 81°F | 65°F | 3.1" |
| October | 38°F | 68°F | 52°F | 3.0" |
| November | 25°F | 53°F | 38°F | 1.1" |
| December | 13°F | 36°F | 24°F | 1.7" |
| Index | Sioux City | Iowa | National |
| Air quality index | 35 | 39 | 42 |
| Pollution index | 397,267 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 322 |
| Days with moderate air quality | 42 |
| 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. |
| Salix, IA | 479 | 35 | 30.0% |
| Hubbard, NE | 158 | 35 | 30.0% |
| Jefferson, SD | 677 | 35 | 30.0% |
| Bronson, IA | 325 | 35 | 30.0% |
| Sergeant Bluff, IA | 4,901 | 35 | 30.0% |
| Sioux City, IA | 82,535 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Kennewick, WA | 82,633 | 37 | 26.0% |
| Melbourne, FL | 82,281 | 36 | 28.0% |
| Chino Hills, CA | 82,800 | 89 | 78.0% |
| Buena Park, CA | 82,228 | 72 | 44.0% |
| Longview, TX | 82,183 | 37 | 26.0% |
| Sioux City, IA | 82,535 | 35 | 30.0% |
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