Average Temperatures for April at Boise, Idaho for the 149-year period 1864 through 2012 normal (1981-10) = 50.8 F degrees RANK RANK AMONG AMONG DATA YEAR COLDEST WARMEST 39.6 1864 1 149 43.8 1970 2 148 43.9 1967 3 147 44.0 1955 c- 4 146 44.2 1883 5 145 44.5 1975 c+ 6 144 45.0 1922 7 143 45.2 1982 w- 8 142 45.3 1964 c 9 141 45.4 1896 w 10 tie 45.4 1920 tie 139 45.9 1984 12 138 46.0 1872 13 tie 46.0 1945 c- tie 135 46.1 1892 15 tie 46.1 1953 w+ tie 134 46.2 1909 w 17 tie 46.2 2011 c- tie 132 46.3 1968 c- 19 131 46.4 1893 20 tie 46.4 1917 c+ tie 129 46.5 1871 22 128 46.6 2008 c+ 23 127 46.7 1972 w+ 24 126 46.8 1929 25 125 47.0 1865 26 tie 47.0 1921 c+ tie 123 47.1 1983 w+ 28 122 47.3 1976 c 29 121 47.4 1911 30 120 47.5 1886 31 tie 47.5 1999 c+ tie 118 47.6 1882 33 tie 47.6 1950 c+ tie 116 47.8 1958 w- 35 115 47.9 1928 c+ 36 114 48.0 1948 37 113 48.1 1961 38 tie 48.1 1993 w+ tie tie 48.1 2001 tie 110 48.2 1901 c 41 tie 48.2 1912 w+ tie tie 48.2 1937 c- tie tie 48.2 1995 w+ tie 106 48.3 1963 c 45 tie 48.3 1986 tie tie 48.3 1991 w+ tie 103 48.4 1880 48 tie 48.4 1899 c- tie tie 48.4 1927 c+ tie 100 48.5 1978 w- 51 99 48.6 1933 c- 52 98 48.7 1957 w 53 tie 48.7 1979 tie 96 48.8 1918 c+ 55 tie 48.8 1935 c- tie tie 48.8 2010 w tie 93 48.9 1944 58 tie 48.9 1997 w tie 91 49.0 1903 c+ 60 tie 49.0 1960 c tie 89 49.1 1973 62 88 49.2 1966 w+ 63 tie 49.2 1971 c+ tie 86 49.3 1887 65 85 49.4 1923 c 66 tie 49.4 1947 w- tie tie 49.4 2003 w- tie 82 49.7 1873 69 tie 49.7 1974 c+ tie 80 49.8 1907 w- 71 tie 49.8 1924 w- tie 78 49.9 1954 c- 73 tie 49.9 1998 w tie 76 50.0 1897 w+ 75 tie 50.0 1902 c+ tie tie 50.0 1940 w+ tie tie 50.0 1996 tie 72 50.1 1874 79 tie 50.1 1878 tie tie 50.1 1941 w+ tie 69 50.2 1965 w 82 68 50.3 1981 w- 83 67 50.4 2002 84 66 50.5 1969 w 85 tie 50.5 2005 tie 64 50.6 1876 87 tie 50.6 1913 w tie tie 50.6 1931 c+ tie tie 50.6 1956 c+ tie tie 50.6 2009 c- tie 59 50.7 1951 w 92 tie 50.7 1959 c tie 57 51.0 1894 94 tie 51.0 1900 w+ tie 55 51.2 1914 w 96 54 51.3 1877 97 53 51.4 1916 98 tie 51.4 1932 w- tie 51 51.6 1891 100 tie 51.6 1985 c tie 49 51.7 2006 c- 102 tie 51.7 2007 w- tie 47 51.8 1905 w+ 104 tie 51.8 1908 c- tie tie 51.8 1919 w+ tie tie 51.8 1938 c tie tie 51.8 1942 w- tie tie 51.8 1946 w tie 41 52.0 1884 110 tie 52.0 1890 tie 39 52.2 1895 112 tie 52.2 1904 c+ tie tie 52.2 1906 w- tie 36 52.4 1962 c- 115 35 52.5 1952 116 34 52.6 1980 w+ 117 tie 52.6 1994 w+ tie 32 52.7 1885 119 tie 52.7 1925 c+ tie tie 52.7 1988 tie 29 53.0 1881 122 tie 53.0 1898 c+ tie 27 53.1 1868 124 tie 53.1 1989 c+ tie 25 53.2 1869 126 24 53.4 1866 127 tie 53.4 1949 tie 22 53.6 1939 c 129 21 53.8 1879 130 tie 53.8 2004 tie 19 54.0 1943 c+ 132 18 54.1 1936 c+ 133 tie 54.1 1977 w+ tie 16 54.3 1870 135 tie 54.3 2000 c+ tie 14 54.6 1990 137 13 54.7 2012 138 12 54.9 1992 w+ 139 11 55.0 1889 140 10 55.1 1867 141 9 55.3 1915 w 142 8 55.5 1875 143 7 55.6 1930 144 6 55.9 1910 c+ 145 5 56.0 1987 w+ 146 4 56.5 1888 147 3 56.6 1926 w+ 148 2 57.6 1934 149 1 5/4/2012 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ average april temperatures at boise, all sites.txt