Monthly Precipitation Totals for September Boise, Idaho for the 146-year period 1864 through 2011 (missing data for 1866 and 1867) normal (1981-10) = .58 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 143 trace 1864 5 tie trace 1886 tie tie trace 1943 c tie tie trace 1974 c+ tie tie trace 1993 w tie 138 0.01 1898 c 10 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 131 0.02 1868 17 tie 0.02 1932 w- tie tie 0.02 1953 w tie tie 0.02 1956 c+ tie 127 0.03 1902 w+ 21 126 0.04 1911 w+ 22 tie 0.04 1934 tie tie 0.04 1979 tie tie 0.04 2003 tie 122 0.05 1891 26 tie 0.05 1916 c+ tie tie 0.05 1952 tie 119 0.06 1874 29 tie 0.06 1888 tie tie 0.06 1889 tie tie 0.06 1957 w tie 115 0.07 1936 w- 33 114 0.08 1954 c- 34 113 0.09 1876 35 tie 0.09 2011 c- tie 111 0.10 1926 c- 37 tie 0.10 1935 c tie tie 0.10 1968 tie tie 0.10 1994 w+ tie 107 0.11 1871 41 tie 0.11 1880 tie 105 0.12 1875 43 tie 0.12 1933 c- tie tie 0.12 1955 c+ tie tie 0.12 1958 tie 101 0.14 1879 47 tie 0.14 1887 tie tie 0.14 1907 tie 98 0.16 1890 50 tie 0.16 1944 w- tie tie 0.16 1946 w tie tie 0.16 2006 w- tie 94 0.18 1892 54 93 0.19 1905 w+ 55 tie 0.19 1949 tie tie 0.19 1966 tie 90 0.20 1883 58 89 0.21 1991 w+ 59 88 0.22 1941 w+ 60 tie 0.22 1995 tie 86 0.24 1878 62 tie 0.24 1924 c+ tie tie 0.24 1988 c+ tie 83 0.25 1881 65 tie 0.25 1928 c+ tie tie 0.25 2004 w- tie 80 0.26 1915 w 68 tie 0.26 1929 c tie 78 0.27 1877 70 77 0.28 1896 w+ 71 tie 0.28 1899 c- tie 75 0.29 1960 c- 73 74 0.30 1992 w 74 73 0.31 1948 75 72 0.32 1895 76 tie 0.32 1906 c+ tie tie 0.32 2005 tie 69 0.34 1938 c+ 79 68 0.35 1914 w+ 80 67 0.36 1981 81 66 0.37 1901 w+ 82 65 0.38 1904 w- 83 64 0.39 1885 84 tie 0.39 1937 tie tie 0.39 2002 w- tie 61 0.40 1894 87 tie 0.40 1962 c+ tie 59 0.44 1945 c- 89 tie 0.44 2001 w- tie 57 0.45 1873 91 56 0.46 1996 92 55 0.50 1910 c+ 93 tie 0.50 1990 w- tie 53 0.51 1909 c 95 52 0.54 1903 c 96 51 0.55 1923 w+ 97 tie 0.55 1965 w+ tie 49 0.58 1967 99 48 0.60 1865 100 tie 0.60 1931 c- tie tie 0.60 2000 c tie 45 0.61 1921 c+ 103 44 0.64 1920 104 tie 0.64 1971 c+ tie 42 0.65 1913 w+ 106 tie 0.65 1983 c- tie tie 0.65 2007 c- tie 39 0.67 1997 w+ 109 38 0.68 1969 w 110 37 0.69 1984 111 36 0.70 1964 c+ 112 35 0.75 1963 w+ 113 34 0.76 1872 114 33 0.77 1912 w- 115 32 0.79 1919 w 116 tie 0.79 1961 c- tie 30 0.80 1947 c 118 29 0.82 1973 c+ 119 28 0.89 1978 120 27 0.92 1950 c+ 121 26 0.94 2008 122 25 0.96 1930 123 24 1.00 1970 c+ 124 23 1.04 1897 125 22 1.06 1900 w+ 126 21 1.11 1972 w+ 127 20 1.19 1925 w+ 128 19 1.20 1977 w+ 129 tie 1.20 1989 c- tie 17 1.26 1908 c+ 131 16 1.36 1882 132 15 1.38 1982 w+ 133 14 1.39 1917 c+ 134 tie 1.39 1927 w- tie 12 1.53 1939 w+ 136 11 1.59 1980 w- 137 10 1.81 1985 138 9 1.87 1940 w+ 139 8 1.96 1998 140 7 2.11 1884 141 tie 2.11 1976 tie 5 2.26 1893 143 4 2.32 1918 w- 144 3 2.54 1959 c 145 2 2.93 1986 w- 146 1 10/6/2011 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