Average Temperatures for September at Boise, Idaho for the 146-year period 1864 through 2011 (missing data for 1866, 1867) normal (1981-10) = 64.9 F degrees RANK RANK AMONG AMONG DATA YEAR COLDEST WARMEST 54.6 1884 1 146 56.0 1890 2 145 56.2 1985 3 144 56.6 1881 4 143 56.7 1895 5 142 57.1 1926 c- 6 tie 57.1 1965 w+ tie 140 57.2 1961 c- 8 139 57.4 1986 w- 9 138 57.6 1921 c+ 10 137 57.7 1912 w- 11 136 57.8 1970 c+ 12 135 57.9 1941 w+ 13 134 58.2 1901 w+ 14 133 58.8 1889 15 tie 58.8 1929 c tie tie 58.8 1972 w+ tie 130 59.0 1893 18 129 59.1 1886 19 128 59.2 1894 20 tie 59.2 1971 c+ tie 126 59.3 1880 22 125 59.4 1896 w+ 23 124 59.5 1878 24 tie 59.5 1900 w+ tie 122 59.6 1927 w- 26 tie 59.6 1964 c+ tie 120 59.7 1903 c 28 tie 59.7 1959 c tie 118 59.9 1945 c- 30 117 60.1 1984 31 116 60.2 1911 w+ 32 115 60.4 1882 33 tie 60.4 1898 c tie tie 60.4 1915 w tie tie 60.4 1982 w+ tie 111 60.8 1877 37 tie 60.8 1983 c- tie 109 61.0 1946 w 39 108 61.2 1933 c- 40 107 61.4 1907 41 tie 61.4 1914 w+ tie tie 61.4 1925 w+ tie tie 61.4 1934 tie tie 61.4 1978 tie 102 61.6 1897 46 tie 61.6 1954 c- tie 100 61.7 1988 c+ 48 99 61.8 1885 49 tie 61.8 1910 c+ tie tie 61.8 1948 tie 96 61.8 1996 tie 95 62.0 1883 53 tie 62.0 1936 w- tie tie 62.0 1958 tie tie 62.0 1977 w+ tie 91 62.1 1868 57 90 62.2 1913 w+ 58 tie 62.2 1919 w tie 88 62.3 1902 w 60 87 62.5 1864 61 tie 62.5 1872 tie tie 62.5 1916 c+ tie tie 62.5 1931 c- tie tie 62.5 1955 c+ tie 82 62.6 1908 c+ 66 tie 62.6 1980 w- tie 80 62.7 1891 68 79 62.8 1947 c 69 78 63.0 1892 70 tie 63.0 1968 tie tie 63.0 1993 w tie 75 63.0 2000 c tie 74 63.1 1909 c 74 tie 63.1 1973 c+ tie 72 63.2 1887 76 tie 63.2 1920 tie tie 63.2 1930 tie tie 63.2 1940 w+ tie tie 63.2 1942 c tie tie 63.2 1950 c+ tie 66 63.3 1989 c- 82 tie 63.3 2005 tie 64 63.4 1992 w 84 63 63.6 1876 85 tie 63.6 1905 w+ tie tie 63.6 1951 w+ tie tie 63.6 2004 w- tie 59 63.7 1981 89 58 63.8 1924 c+ 90 tie 63.8 1944 w- tie 56 64.0 1869 92 tie 64.0 1873 tie tie 64.0 1999 c- tie 53 64.1 1932 w- 95 tie 64.1 1976 tie 51 64.2 1956 c+ 97 tie 64.2 1969 w tie 49 64.3 1928 c+ 99 tie 64.3 1939 w+ tie 47 64.4 1906 c+ 101 46 64.6 1865 102 45 64.7 2007 c- 103 44 64.8 1904 w- 104 43 65.1 1899 c- 105 tie 65.1 2002 w- tie 41 65.2 1918 w- 107 tie 65.2 1962 c+ tie 39 65.3 1957 w 109 tie 65.3 1974 c+ tie 37 65.4 1952 111 tie 65.4 2006 w- tie 35 65.5 1975 c+ 113 34 65.6 1870 114 tie 65.6 1874 tie tie 65.6 1937 tie tie 65.6 1949 tie tie 65.6 1987 w tie 29 65.7 1923 w+ 119 tie 65.7 1995 tie 27 65.8 1991 w 121 26 66.0 1917 c+ 122 tie 66.0 1922 c tie tie 66.0 1953 w tie tie 66.0 1960 c- tie 22 66.1 1879 126 tie 66.1 2008 tie 20 66.2 1966 128 19 66.6 1943 c 129 18 66.7 2003 130 17 66.8 1871 131 tie 66.8 1994 w+ tie 15 67.0 1935 c 133 14 67.3 1979 134 13 67.6 1875 135 tie 67.6 2010 c+ tie 11 67.7 1997 w+ 137 10 68.0 1888 138 9 68.4 2001 w- 139 8 68.6 1938 c+ 140 tie 68.6 1967 tie 6 69.8 1998 142 5 69.9 1990 w- 143 4 70.6 2009 w- 144 3 70.9 1963 w+ 145 2 71.4 2011 c- 146 1 10/6/2011 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ average septempber temperatures at boise, all sites.txt