Contiguous U.S., Precipitation Rankings, December 2015 1901-2000 Inches 1 4.06 2.35 1.71 128 1 1930 2015 2014 2015 highest 2 7.41 4.58 2.83 128 1 1976 2015 2014 2015 highest 3 10.31 6.74 3.57 128 1 1917 2015 2014 2015 highest 4 12.43 9.23 3.20 127 2 1939 2018 2014 2015 top-tenth 5 14.84 11.85 2.99 126 3 1917 2018 2014 1996 top-tenth 6 18.07 14.62 3.45 127 2 1917 2018 2014 2015 top-tenth 7 21.62 17.55 4.07 127 2 1917 2018 2014 2015 top-tenth 8 26.06 20.46 5.60 128 1 1917 2015 2014 2015 highest 9 28.89 22.98 5.91 128 1 1956 2015 2014 2015 highest 10 31.02 25.49 5.53 128 1 1956 2015 2014 2015 highest 11 32.76 27.62 5.14 127 2 1910 2018 2014 2015 top-tenth 12 34.59 29.94 4.65 124 5 1910 1973 2014 1983 top-tenth 18 50.09 44.58 5.51 124 4 1954 2019 2014 1983 top-tenth 24 65.44 59.90 5.54 117 11 1931 2019 2014 1998 top-tenth 1906 36 96.50 89.86 6.64 113 14 1956 2019 2014 1998 top-third 48 124.03 119.78 4.25 94 32 1956 2019 2014 2011 top-third 60 154.13 149.68 4.45 92 33 1956 2019 2014 2011 top-third 1908