Average Winter Temperatures (Dec,Jan,Feb) Boise, Idaho for the 144-season period 1879-1880 through 2022-2023 normal (1991-2020) = 33.8 degrees Rank Rank Among Among Data Season Coldest Warmest 22.1 1948-49 1 144 22.6 1984-85 c- 2 143 24.8 1882-83 3 142 24.9 1983-84 w- 4 141 25.0 1988-89 c+ 5 140 25.6 1928-29 6 139 25.8 1978-79 7 138 26.7 1932-33 8 137 26.8 1891-92 9 tie 26.8 1963-64 w tie 135 27.0 1909-10 11 134 27.1 1954-55 c- 12 133 27.4 1916-17 13 tie 27.4 1976-77 w- tie tie 27.4 1992-93 tie 130 27.5 1977-78 w- 16 tie 27.5 2016-17 tie 128 27.7 1936-37 18 tie 27.7 1985-86 tie 126 28.0 1990-91 20 125 28.1 1961-62 21 124 28.2 1951-52 w- 22 123 28.5 1921-22 23 tie 28.5 1959-60 tie 121 28.9 1931-32 25 tie 28.9 1956-57 c- tie 119 29.1 1890-91 27 tie 29.1 1941-42 tie 117 29.3 1881-82 29 116 29.7 1919-20 30 tie 29.7 1935-36 tie 114 29.9 1898-99 32 113 30.0 1981-82 33 112 30.1 1930-31 34 111 30.2 1884-85 35 tie 30.2 1887-88 tie tie 30.2 1892-93 tie 108 30.3 1912-13 38 tie 30.3 2012-13 c- tie 106 30.5 1927-28 40 105 30.6 1889-90 41 tie 30.6 1943-44 tie tie 30.6 1949-50 tie 102 30.7 2000-01 c- 44 101 30.8 1914-15 45 100 31.1 1897-98 tie tie 31.1 1905-06 tie tie 31.1 1986-87 w tie 97 31.2 1945-46 49 tie 31.2 2013-14 c- tie 95 31.3 1883-84 51 tie 31.3 1902-03 tie tie 31.3 1972-73 w++ tie 92 31.7 1894-95 54 91 31.8 1893-94 55 90 31.9 1888-89 56 tie 31.9 2021-22 c tie tie 31.9 1965-66 w tie 87 32.0 1929-30 59 86 32.1 1922-23 60 tie 32.1 1924-25 tie tie 32.1 1947-48 tie tie 32.1 1955-56 c- tie tie 32.1 2001-02 tie 81 32.2 1911-12 65 80 32.3 1987-88 w- 66 79 32.4 1923-24 67 tie 32.4 1934-35 tie 77 32.5 1942-43 69 tie 32.5 1946-47 tie tie 32.5 1971-72 c- tie tie 32.5 2007-08 c tie 73 32.6 2022-23 73 72 32.7 1918-19 74 tie 32.7 1975-76 c+ tie 70 32.8 1910-11 76 tie 32.8 1967-68 c- tie tie 32.8 1974-75 c- tie 67 32.9 1938-39 79 tie 32.9 1944-45 tie tie 32.9 1989-90 tie 64 33.2 1915-16 82 tie 33.2 2008-09 c- tie 62 33.3 1904-05 84 tie 33.3 2006-07 w tie 60 33.5 2003-04 86 tie 33.5 2005-06 c- tie 58 33.6 1896-97 88 tie 33.6 1993-94 tie 56 33.7 1995-96 c- 90 55 33.8 1879-80 91 54 33.9 1926-27 92 tie 33.9 2017-18 c- tie 52 34.0 1962-63 94 tie 34.0 2018-19 w- tie 50 34.1 2010-11 c 96 tie 34.1 1895-96 tie tie 34.1 1950-51 c- tie 47 34.2 1913-14 99 46 34.3 1998-99 c 100 45 34.4 1899-00 101 44 34.5 1885-86 tie tie 34.5 1901-02 tie 42 34.6 1980-81 104 41 34.7 1886-87 105 tie 34.7 1903-04 tie 39 34.8 1920-21 107 tie 34.8 2009-10 w tie tie 34.8 2011-12 c- tie tie 34.8 2020-21 c tie 35 34.9 1880-81 111 tie 34.9 1960-61 tie 33 35.0 1970-71 c 113 tie 35.0 2004-05 w- tie 31 35.1 1996-97 c- 115 30 35.2 1968-69 w- 116 29 35.3 1966-67 tie tie 35.3 1979-80 w- tie 27 35.4 1964-65 c- tie 26 35.5 1953-54 w- 120 tie 35.5 1973-74 c+ tie tie 35.5 2015-16 w++ tie 23 35.6 1991-92 w+ 123 22 35.7 1900-01 124 tie 35.7 1908-09 tie tie 35.7 1925-26 tie 19 35.9 1999-00 c+ 127 18 36.0 1940-41 128 tie 36.0 1957-58 w+ tie tie 36.0 1994-95 w tie 15 36.3 1982-83 w++ 131 14 36.5 1958-59 w- 132 13 36.6 1907-08 133 12 36.8 1997-98 w++ 134 11 37.2 1952-53 w- 135 tie 37.2 2019-20 tie 9 37.3 1906-07 137 tie 37.3 1969-70 w- tie 7 37.4 1939-40 139 6 37.6 2002-03 w- 140 5 37.9 1917-18 141 tie 37.9 2014-15 w- tie 3 38.0 1937-38 143 2 42.1 1933-34 144 1 4/2/2023 c = la nina w = el nino Oceanic Nino Index weak c- or w- 0.5-0.9 moderate c or w 1.0-1.4 strong c+ or w+ 1.5-1.9 very strong w++ >= 2.0 (not available before 1950) average winter temperatures at boise, all sites.txt