Average Temperatures for December at Boise, Idaho for the 158-year period 1877 through 2022 normal (1991-2020) = 32.0 F degrees RANK RANK AMONG AMONG DATA YEAR COLDEST WARMEST 12.6 1985 1 158 18.1 1990 w+ 2 157 20.4 1865 3 156 21.8 1924 w- 4 155 22.9 1984 5 154 23.2 1983 w+ 6 153 23.3 2016 c- 7 152 23.6 1919 w+ 8 151 23.8 1972 w+ 9 150 23.9 1930 c+ 10 tie 23.9 2013 tie 148 24.0 1914 w- 12 147 24.6 1870 13 146 25.4 1864 14 tie 25.4 1932 w- tie tie 25.4 1948 tie 143 25.6 1898 c 17 142 26.7 2009 w 18 141 27.0 1978 w+ 19 140 27.0 1988 w- tie 139 27.4 1909 w- 21 138 27.5 1951 c+ 22 137 27.6 1905 w+ 23 136 27.8 1967 c+ 24 135 27.9 1959 w+ 25 134 28.0 1927 c- 26 tie 28.0 1986 tie 132 28.1 1884 28 tie 28.1 1963 c tie 130 28.3 1928 30 129 28.4 1891 31 tie 28.4 1916 c- tie 127 28.5 1992 w+ 33 126 28.6 1931 34 tie 28.6 2017 c- tie 124 28.9 1913 w 36 123 29.0 1935 c- 37 tie 29.0 1944 w- tie 121 29.2 2023 c 39 120 29.3 1976 c+ 40 119 29.5 2005 c- 41 118 29.6 1918 c+ 42 117 30.0 1922 c+ 43 116 30.1 1899 c 44 tie 30.1 1965 w+ tie 114 30.2 1926 w+ 46 tie 30.2 1971 c+ tie 112 30.4 1878 48 tie 30.4 1895 tie tie 30.4 1989 c+ tie tie 30.4 1994 tie 108 30.5 1960 c- 52 107 30.6 1954 53 106 30.7 1956 c+ 54 tie 30.7 1998 tie tie 30.7 2001 tie 103 30.8 1945 c- 57 102 30.9 1961 58 101 31.1 1879 59 tie 31.1 1908 tie tie 31.1 1949 w- tie tie 31.1 2000 tie 97 31.2 1894 63 tie 31.2 1911 c tie tie 31.2 1997 w+ tie 94 31.3 1953 w 66 tie 31.3 1966 w tie tie 31.3 2011 c- tie 91 31.4 1947 w 69 tie 31.4 1975 tie 89 31.5 1877 71 tie 31.5 1982 w+ tie tie 31.5 2008 tie 86 31.6 1912 w+ 74 tie 31.6 1923 c tie 84 31.7 1991 w+ 76 83 31.8 2006 w 77 tie 31.8 2015 w+ tie 81 31.9 1999 c+ 79 80 32.0 1882 80 79 32.1 1869 81 78 32.2 1903 w 82 77 32.4 2007 c+ 83 76 32.5 1876 84 75 32.6 1887 85 tie 32.6 1897 w+ tie tie 32.6 1904 c+ tie tie 32.6 2018 tie 71 32.8 1943 c+ 89 70 32.9 1921 c+ 90 tie 32.9 1934 c tie tie 32.9 2020 c- tie tie 32.9 1987 w+ tie 66 33.0 1881 94 tie 33.0 1890 tie 64 33.1 1980 96 tie 33.1 1995 w tie 62 33.2 1974 c+ 98 61 33.3 1993 w+ 99 60 33.4 1873 100 tie 33.4 1892 tie tie 33.4 1942 w+ tie 57 33.5 1872 103 tie 33.5 1970 w tie 55 33.6 1915 w+ 105 54 34.1 1889 106 tie 34.1 1952 w+ tie tie 34.1 2021 c- tie 51 34.2 1938 c 109 50 34.3 1893 110 tie 34.3 1920 w- tie 48 34.4 1957 w+ 112 47 34.6 1969 w+ 113 46 34.8 1910 c+ 114 45 35.0 1925 c+ 115 tie 35.0 1941 w+ tie tie 35.0 2010 c+ tie 42 35.1 1968 c- 118 41 35.2 1871 119 tie 35.2 1883 tie tie 35.2 1936 tie tie 35.2 1964 w tie 37 35.3 1885 123 tie 35.3 1940 w tie tie 35.3 1981 tie 34 35.4 1902 c 126 tie 35.4 1955 c tie tie 35.4 1962 c+ tie tie 35.4 2004 w- tie 31 35.5 1880 129 30 35.6 1901 130 29 35.7 1874 131 28 35.8 1896 132 tie 35.8 1979 tie 26 35.9 2012 134 25 36.1 2019 135 24 36.2 1946 136 23 36.3 1950 c+ 137 tie 36.3 1996 tie 21 36.4 1900 w 139 20 36.6 1958 w+ 140 19 36.8 1907 c- 141 18 37.0 1888 142 17 37.2 2003 143 16 37.3 1977 w- 144 tie 37.3 2002 w tie 14 37.4 2014 w- 146 13 37.5 1937 c- 147 12 37.6 1929 c+ 148 11 37.7 1886 149 10 38.2 1868 150 9 38.4 1973 w+ 151 8 38.7 1906 w+ 152 7 39.1 1866 153 6 40.2 1939 c+ 154 5 40.6 1867 155 4 41.0 1875 156 3 42.4 1933 w- 157 2 43.2 1917 c+ 158 1 1/12/2023 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ very strong c++ or w++ average december temperatures at boise, all sites.txt courier new 12