Iowa, Precipitation Rankings, October 2010 1901-2000 Inches 1 0.91 2.29 -1.38 14 115 1952 2009 2005 2009 bottom-third 2005 2 6.31 5.96 0.35 75 54 1952 1941 2006 2009 normal 3 11.14 9.80 1.34 87 42 1953 2018 2008 2009 top-third 4 19.03 13.66 5.37 120 9 1953,1976 1993 2009 2007 top-tenth 5 29.31 18.29 11.02 126 3 1976 1993 2009 1993 top-tenth 6 33.50 22.33 11.17 125 4 1976 1993 2009 1993 top-tenth 7 37.20 25.28 11.92 127 2 1988 1993 2009 1993 top-tenth 8 38.92 27.23 11.69 127 2 1988 1993 2009 1993 top-tenth 9 39.88 28.25 11.63 126 3 1988 1993 2009 1993 top-tenth 10 41.18 29.23 11.95 127 2 1988 1993 2009 1993 top-tenth 11 43.72 30.33 13.39 126 2 1988 1993 2009 1993 top-tenth 12 44.91 32.07 12.84 126 2 1956 1993 2009 1993 top-tenth 18 72.29 54.47 17.82 124 4 1956 2019 2009 1993 top-tenth 24 83.93 64.23 19.70 123 4 1956 1993 2009 2008 top-tenth 36 125.87 96.34 29.53 125 1 1957 2010 2009 2010 highest 48 169.52 128.36 41.16 124 1 1958 2010 2009 2010 highest 60 200.98 160.34 40.64 123 1 1956 2010 2009 2010 highest