Average Temperatures for May at Boise, Idaho for the 159-year period 1878 through 2022 normal (1991-2020) = 59.6 F degrees RANK RANK AMONG AMONG DATA YEAR COLDEST WARMEST 50.1 1896 w 1 159 52.2 1953 w+ 2 158 52.5 1899 c- 3 tie 52.5 1916 tie 156 52.6 1908 c- 5 155 52.7 1959 c 6 154 53.0 1942 w- 7 153 53.5 1880 8 152 53.6 1909 w 9 tie 53.6 1955 c- tie tie 53.6 2010 w- tie 149 53.7 1977 w+ 12 148 53.9 1911 13 147 54.0 1933 c- 14 tie 54.0 1943 c+ tie 145 54.1 1950 c+ 16 144 54.3 1978 w- 17 143 54.4 1927 c+ 18 142 54.5 1960 c 19 141 54.7 1879 20 tie 54.7 1981 w- tie 139 54.8 1905 w+ 22 tie 54.8 1918 c+ tie tie 54.8 1984 tie 136 54.9 1965 w 25 tie 54.9 1982 w- tie tie 54.9 1991 w+ tie 133 55.0 1915 w 28 tie 55.0 1917 c+ tie tie 55.0 1920 tie 130 55.1 1893 31 tie 55.1 1964 c tie tie 55.3 1906 w- 33 127 55.4 1974 c+ 34 126 55.5 1996 35 tie 55.5 2011 c- tie tie 55.5 2022 c- tie 123 55.6 1892 38 122 55.7 1990 39 121 55.8 1930 40 tie 55.8 1999 c+ tie 119 56.0 1883 42 tie 56.0 1962 c- tie 117 56.2 1876 44 tie 56.2 1938 c tie tie 56.2 1975 c+ tie 114 56.3 1948 47 tie 56.3 1989 c+ tie 112 56.3 1998 w 49 111 56.4 1912 w+ 50 tie 56.4 1922 tie 109 56.5 1967 52 tie 56.5 1983 w+ tie tie 56.6 1935 c- 54 tie 56.6 1945 c- tie 105 56.7 1898 c+ 56 104 56.8 1868 57 tie 56.8 1923 c tie tie 56.8 1951 w tie 101 56.9 1995 w+ 60 100 57.1 1878 61 99 57.2 1895 62 tie 57.2 1921 c+ tie tie 57.2 1980 w+ tie 96 57.4 1903 c+ 65 95 57.5 1882 66 tie 57.5 1970 tie 93 57.6 1902 c+ 68 tie 57.6 1946 w tie tie 57.6 1952 tie 90 57.7 1873 71 tie 57.7 1877 tie 88 57.8 1929 73 tie 57.8 1968 c- tie tie 57.8 1979 tie 85 57.9 1961 76 tie 57.9 1988 tie 83 58.0 1907 w- 78 82 58.2 1957 w 79 81 58.4 1881 80 tie 58.4 1932 w- tie tie 58.4 1941 w+ tie 78 58.5 1985 c 83 77 58.6 1904 c+ 84 tie 58.6 1944 tie 75 58.7 1926 w+ 86 tie 58.7 2003 tie tie 58.7 2004 tie 72 58.9 1885 89 tie 58.9 1889 tie tie 58.9 2012 tie 69 59.0 1913 w 92 68 59.1 1886 93 tie 59.1 1986 tie tie 59.1 2002 tie 65 59.3 1894 96 tie 59.3 1919 w+ tie tie 59.3 1976 c tie 62 59.4 2000 c 99 tie 59.4 2005 tie 60 59.5 1956 c+ 101 tie 59.5 2021 tie 58 59.7 1870 103 tie 59.7 1900 w+ tie tie 59.7 2017 tie 55 59.8 1910 c+ 106 tie 59.8 2019 w tie 53 59.9 1871 108 tie 59.9 1872 tie tie 59.9 1888 tie tie 59.9 1954 c- tie 49 60.0 1971 c+ 112 48 60.1 1891 113 47 60.2 1890 114 46 60.3 1887 115 45 60.4 1937 c- 116 44 60.5 1973 117 tie 60.5 2008 c tie 42 60.5 2020 119 41 60.6 1972 w+ 120 40 60.7 2014 121 39 60.9 1963 c 122 38 61.0 1875 123 tie 61.0 1994 w+ tie tie 61.0 2006 tie tie 61.0 2013 tie 34 61.1 1884 127 tie 61.1 1969 w tie tie 61.1 2016 w- tie 31 61.2 1867 130 tie 61.2 1914 w tie 29 61.3 1940 w+ 132 28 61.4 1931 c+ 133 tie 61.4 2001 tie 26 61.5 1949 135 tie 61.5 1966 w+ tie 24 61.6 2009 137 23 61.7 1901 c 138 22 61.8 1925 c+ 139 tie 61.8 1939 c tie 20 62.0 1866 141 19 62.1 2015 w- 142 18 62.2 1947 w- 143 tie 62.2 1987 w+ tie 16 62.5 2007 145 15 62.8 1936 c+ 146 14 62.9 1997 w 147 13 63.1 1993 w+ 148 12 63.4 1897 w+ 149 11 63.5 1874 150 10 63.8 1924 w- 151 tie 63.8 2018 tie 8 64.3 1958 w- 153 tie 64.3 1992 w+ tie 6 64.6 1928 c+ 155 5 65.4 1934 156 4 65.5 1864 157 3 66.1 1869 158 2 67.2 1865 159 1 6/2/2022 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ very strong c++ or w++ average may temperatures at boise, all sites.txt