Iowa, Average Temperature Rankings, March 2017 1901-2000 Degrees Fahrenheit 1 37.5 34.6 2.9 88 41 1960 2012 2015 2016 top-third 2 36.0 28.7 7.3 124 5 1899 2012 2016 2012 top-tenth 3 32.1 25.0 7.1 122 7 1912 2012 2016 2012 top-tenth 4 29.8 24.5 5.3 119 9 1979 2012 2015 2016 top-tenth 5 32.8 26.7 6.1 123 5 1912 2012 2015 2016 top-tenth 6 36.6 30.9 5.7 126 2 1912 2012 2016 2012 top-tenth 2000 7 41.0 35.4 5.6 126 2 1912 2012 2016 2016 top-tenth 2016 8 44.9 39.9 5.0 126 2 1912 2012 2016 2012 top-tenth 9 48.0 43.7 4.3 126 2 1899,1912 2012 2016 2012 top-tenth 10 50.5 46.3 4.2 126 2 1899,1904 2012 2016 2012 top-tenth 11 51.3 47.5 3.8 126 2 1899 2012 2016 2012 top-tenth 12 51.2 47.5 3.7 126 2 1899,1936 2012 2016 2012 top-tenth 18 46.3 42.0 4.3 126 1 1979 2017 2016 2017 highest 24 50.9 47.5 3.4 126 1 1905,1952 2017 2016 2017 highest 36 49.6 47.5 2.1 122 4 1918 2018 2016 2013 top-tenth 48 48.5 47.5 1.0 100 25 1906 1935,2002 2016 2014 top-third 1941,1957,2009 60 48.6 47.5 1.1 109 15 1997 1935 2015 2016 top-third 1923,1990,2009,2021