-20.0 -10.0 0.0 10.0 20.0 30.0 40.0 50.0 0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 Daily maximal and minimal temperatures (red and blue dots) for station USC00110072 in Iowa ( 41.1978 N , 90.7447 W ) in the year 2018. The minimal temperature was -28.3 deg centigrade and the maximal temperature was 35.6 deg centigrade. The average temperature over the whole year was 9.6 deg centigrade.