Monthly Precipitation Totals for September Boise, Idaho for the 157-year period 1864 through 2022 (missing data for 1866 and 1867) normal (1991-20) = .42 inch Rank Rank Among Among Data Year Driest Wettest 0.00 1869 1 tie 0.00 1870 tie tie 0.00 1987 w tie tie 0.00 1999 c- tie 154 trace 1864 5 tie trace 1886 tie tie trace 1943 c tie tie trace 1974 c+ tie tie trace 1993 w tie tie trace 2018 tie 148 0.01 1898 c 11 tie 0.01 1922 c tie tie 0.01 1942 c tie tie 0.01 1951 w+ tie tie 0.01 1975 c+ tie tie 0.01 2009 w- tie tie 0.01 2010 c+ tie 141 0.02 1868 18 tie 0.02 1932 w- tie tie 0.02 1953 w tie tie 0.02 1956 c+ tie 137 0.03 1902 w+ 22 136 0.04 1911 w+ 23 tie 0.04 1934 tie tie 0.04 1979 tie tie 0.04 2003 tie tie 0.04 2020 tie 131 0.05 1891 28 tie 0.05 1916 c+ tie tie 0.05 1952 tie tie 0.05 2012 tie 127 0.06 1874 32 tie 0.06 1888 tie tie 0.06 1889 tie tie 0.06 1957 w tie 123 0.07 1936 w- 36 122 0.08 1954 c- 37 121 0.09 1876 38 tie 0.09 2011 c- tie 119 0.10 1926 c- 40 tie 0.10 1935 c tie tie 0.10 1968 tie tie 0.10 1994 w+ tie 115 0.11 1871 44 tie 0.11 1880 tie 113 0.12 1875 46 tie 0.12 1933 c- tie tie 0.12 1955 c+ tie tie 0.12 1958 tie 109 0.14 1879 50 tie 0.14 1887 tie tie 0.14 1907 tie 106 0.16 1890 53 tie 0.16 1944 w- tie tie 0.16 1946 w tie tie 0.16 2006 w- tie 102 0.18 1892 57 101 0.19 1905 w+ 58 tie 0.19 1949 tie tie 0.19 1966 tie 98 0.20 1883 61 97 0.21 1991 w+ 62 tie 0.21 2016 tie 95 0.22 1941 w+ 63 tie 0.22 1995 tie 93 0.24 1878 66 tie 0.24 1924 c+ tie tie 0.24 1988 c+ tie tie 0.24 2022 c- tie 89 0.25 1881 70 tie 0.25 1928 c+ tie tie 0.25 2004 w- tie 86 0.26 1915 w 73 tie 0.26 1929 c tie 84 0.27 1877 75 83 0.28 1896 w+ 76 tie 0.28 1899 c- tie 81 0.29 1960 c- 77 80 0.30 1992 w 78 79 0.31 1948 80 78 0.32 1895 81 tie 0.32 1906 c+ tie tie 0.32 2005 tie 75 0.34 1938 c+ 84 74 0.35 1914 w+ 85 73 0.36 1981 86 72 0.37 1901 w+ 87 tie 0.37 2021 tie 70 0.38 1904 w- 89 69 0.39 1885 90 tie 0.39 1937 tie tie 0.39 2002 w- tie 66 0.40 1894 93 tie 0.40 1962 c+ tie 64 0.44 1945 c- 95 tie 0.44 2001 w- tie 62 0.45 1873 97 61 0.46 1996 98 60 0.50 1910 c+ 99 tie 0.50 1990 w- tie 58 0.51 1909 c 101 tie 0.51 2015 w+ tie 56 0.54 1903 c 103 55 0.55 1923 w+ 104 tie 0.55 1965 w+ tie 53 0.56 2017 106 52 0.58 1967 107 51 0.60 1865 108 tie 0.60 1931 c- tie tie 0.60 2000 c tie 48 0.61 1921 c+ 111 47 0.64 1920 112 tie 0.64 1971 c+ tie 45 0.65 1913 w+ 114 tie 0.65 1983 c- tie tie 0.65 2007 c- tie 42 0.67 1997 w+ 117 41 0.68 1969 w 118 40 0.69 1984 119 39 0.70 1964 c+ 120 38 0.75 1963 w+ 121 37 0.76 1872 122 36 0.77 1912 w- 123 35 0.79 1919 w 124 tie 0.79 1961 c- tie 33 0.80 1947 c 126 32 0.82 1973 c+ 127 31 0.84 2019 128 30 0.89 1978 129 29 0.92 1950 c+ 130 tie 0.92 2014 tie 27 0.94 2008 132 26 0.96 1930 133 25 1.00 1970 c+ 134 24 1.04 1897 135 23 1.06 1900 w+ 136 22 1.11 1972 w+ 137 21 1.19 1925 w+ 138 20 1.20 1977 w+ 139 tie 1.20 1989 c- tie 18 1.26 1908 c+ 141 17 1.36 1882 142 16 1.38 1982 w+ 143 15 1.39 1917 c+ 144 tie 1.39 1927 w- tie 13 1.53 1939 w+ 146 12 1.59 1980 w- 147 11 1.75 2013 148 10 1.81 1985 149 9 1.87 1940 w+ 150 8 1.96 1998 151 7 2.11 1884 152 tie 2.11 1976 tie 5 2.26 1893 154 4 2.32 1918 w- 155 3 2.54 1959 c 156 2 2.93 1986 w- 157 1 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ precip boise monthly rank allsites sep.txt 10/2/2022