| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 29°F | 20°F | 0.2" |
| February | 14°F | 31°F | 22°F | 2.0" |
| March | 29°F | 47°F | 36°F | 0.7" |
| April | 39°F | 61°F | 49°F | 3.9" |
| May | 50°F | 73°F | 61°F | 5.8" |
| June | 61°F | 82°F | 71°F | 2.9" |
| July | 64°F | 85°F | 74°F | 2.8" |
| August | 62°F | 81°F | 70°F | 2.6" |
| September | 54°F | 76°F | 64°F | 2.7" |
| October | 42°F | 62°F | 51°F | 1.9" |
| November | 29°F | 49°F | 37°F | 0.9" |
| December | 17°F | 32°F | 24°F | 3.5" |
| Index | Schleswig | Iowa | National |
| Air quality index | 35 | 39 | 42 |
| Pollution index | 517,691 | 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 | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Deloit, IA | 305 | 35 | 30.0% |
| Arthur, IA | 228 | 35 | 30.0% |
| Battle Creek, IA | 844 | 35 | 30.0% |
| Denison, IA | 8,319 | 35 | 30.0% |
| Ida Grove, IA | 1,929 | 35 | 30.0% |
| Schleswig, IA | 979 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Danvers, IL | 979 | 44 | 12.0% |
| Selma, IN | 979 | 35 | 30.0% |
| Burnside, KY | 979 | 40 | 20.0% |
| White Sulphur Springs, MT | 979 | 40 | 20.0% |
| Gorman, NC | 979 | 44 | 12.0% |
| Schleswig, IA | 979 | 35 | 30.0% |
Here are the best places to live in Iowa
Top 10 cities in Iowa with the best education system
These are the 10 most affordable cities in Iowa
10 best cities to buy a new house in Iowa