Here is a list of lows this morning across the state

Shenandoah -17
Clarinda -17
Atlantic -13
Sioux City -13
Creston, Harlan and Estherville -11
Audubon and Red Oak -10
Carroll, Orange City and Sheldon -9
Fort Dodge, Denison, LeMars -8
Algona, Knoxville, Ames, Algona and Mason City -7
Des Moines, Cedar Rapids, Dubuque and Lamoni -6
Iowa City, Ottumwa and Davenport -3
Burlington 2
Keokuk 6