113 yrs ago, on 1/12/1912 a low of -47 at Washta set the all-time Iowa record that has only been tied once since. Other lows included -46 at Inwood, -42 at Alton/Humboldt, -40 at Carroll/Denison/Rock Rapids/Sibley. Des Moines was -29 which is its 2nd lowest temperature on record.