COLD SPELLS at BOISE, IDAHO (1879-2010) Season Beginning Date Daily Minimum Temperatures of Cold Spell* 1879-80 12/22 16, 3, -4, 9, 13 1881-82 2/17 11, 0, 5, 11, 10, 8 1882-83 12/31 -4, -8, -10, 4, 4, 4 1/17 -20, -27, -16, 4, -2, 0, -3, 8 2/2 -2, -11, -12, -10, -8, -1, -3, 5, 4, 7 1883-84 2/11 -1, -8, -4, -6 1884-85 12/30 -3, -7, -7 1885-86 1/18 1, 8, -1, 8 1887-88 1/6 0, -12, -18, -19, -10, -7, 0, -9, -22, -26, -28, -17, -14, -9 1889-90 1/5 0, -4, -9, -9, -8, -5, -12, 5, 12, 5, 6 2/23 19, 29, 10, 0, -8, -1, 13, 19, 25, 32 1893-94 1/4 0, -1 1898-99 c 2/3 -1, -9, -7, -6 1901-02 c 1/25 -3, -8, 1, -2, -6 1904-05 w+ 2/11 5, -2, 12, 12 1909-10 c+ 1/2 -1, -6, -8, -2, -3, 10 1911-12 w+ 1/2 6, 3, 1, 8, 12, -3, -5, 8 1915-16 c- 12/30 11, -2, -2, 8, 11 1916-17 c+ 1/13 7, 5, 2, 0, 4, -2, 4, 5, 12 1919-20 w- 12/6 7, -2, 5 w- 12/11 10, -4, -7, -5, -4, 1, 4, 8, 14 1921-22 c+ 1/12 12, 11, 12, 9, 8, 6, -8, -10, -2, 8, 0, 0 1922-23 c 12/14 10, 2, -2, 2, 17 1924-25 c+ 12/16 8, -1, -5, -5, -3, 10, 0, -4, -9, -18, -18, -6, -5 1926-27 c- 12/13 2, -3 c- 1/20 7, -2, 0, 6, 9 1928-29 c+ 1/20 9, 2, 11, -7, 8, 12 c+ 2/6 8, -1, 3, 2, 0, 1, 2, 8, 6 1929-30 c+ 1/12 15, 2, 1, 9, 0, -4, 3, 7, -4, -13, -16, -17, 2, 8 1932-33 w- 12/7 20, 10, 5, 4, -2, -4, -5, -3, -1, 1, 7, 13, 9 w- 2/1 19, 17, 12, 12, 6, 10, -1, 3, -13, -7, 5, 12, -5, 1, 16, 17, 16, 22, 24, 25 1934-35 c- 1/19 2, -6, 4, 21 1935-36 2/7 -3, -3, 1, 14, 15, 24, 21, 19, 12, 14, 14, 22, 26 1936-37 c- 1/1 19, 11, 11, 18, 16, -9, -14, -13, -5, 8, 3, 0, 1, 13 1941-42 w+ 12/30 20, 0, -13, 7, -4, -8, -10, -10, -9, 8, 15, 6 1942-43 c+ 1/16 16, -1, -10, 9 1946-47 w 12/28 18, 20, 14, 16, 15, 9, 10, 9, 12, 12, 13, 16, 12, 19, 17, 10, 15, -2, -10, 4, -1, 4, 12, 10, 13, 14 1948-49 w- 12/15 20, 15, 13, 10, 19, 15, 11, 3, 0, 3, 5, 6, 9, 16 w- 12/30 16, 18, 12, 10, 3, -3, 1, 11, 8, 2, -2, -5, -6, -3, -1, 7, 4, 3, 4, 1, 1, -7, 0, -1, 1, -6, -5, -6, -1, -2, 1, -1, -4, 8, -1, 21, 15, 8, 14, 13, 14 1949-50 c+ 12/18 20, 10, -1, 21 c+ 1/28 10, 7, -8, -17, -10, -9, -6, 23 1951-52 w+ 12/30 17, 11, 2, 3, -2, 5, 4 1955-56 c+ 11/11 25, 13, 16, 1, -3, 5, 13, 24 c+ 1/25 19, 13, 12, 11, 9, -3, -5, -6, -4, 3, 5, 8, 11, 18, 12, 13, 14, 25 1956-57 c- 1/15 19, 11, 11, 11, 7, 22, 14, 20, 16, 19, 4, -8, -9, -6, -9, -9, 7 1959-60 c- 1/12 15, 6, 9, 3, 3, -1, -4, 6, 18, 7, 15, 19, 13, 20 1961-62 c+ 1/9 20, 13, 14, 13, 13, 3, 17, 17, 17, 21, 12, -6, -12, -11, -12, -4, 9, 13, 16, 17, 15, 18, 20, 22, 23, 25, 24, 20, 24, 24 1962-63 c 1/9 19, 5, -5, -7, 1, 12, 20, 21, 18, 6, -1, 9, 12, 9, 12, 9, 18, 2, 19, 14, 13, 13, 18 1972-73 w+ 12/3 19, 5, -6, 7, 0, -19, -21, -23, -22, -9, -14, -9, -7, 17 1973-74 c+ 1/1 8, 7, 8, 6, 3, 2, 2, 0, -5, -4, -2, 11 1974-75 12/28 9, 7, 2, 1, 0, -5, 8 1976-77 w- 1/3 17, 8, 3, -4, -5, -14, -13, -8, 7, 8, 19, 13, 8, 14, 18, 17, 15 1978-79 12/28 7, 0, -2, -9, -10, 7, 6, 6, 10, -6, -10, -9, 14, 20 1/16 14, 11, 6, 3, 19, 20, 4, 3, 10, 3, -8, 2, 10, -8, 13, -12, -5, -12, 0, 14, 19, 21 1979-80 1/26 17, -7, -4, 0, 0, 11, 23, 24 1981-82 c 1/5 13, -10, -1, 4, 0, -2, -2, 13, 12, 18, 20 c 2/3 15, 3, 1, 0, 3, 0, 1, 1, 3, 7, 12 1982-83 w+ 12/27 2, 2, 0, 1, 5, -1, -2, 14 1983-84 12/19 5, -6, -8, -15, -18, 2, 13, 15, -4, -4, 13 1/10 15, 9, 10, 18, 5, 12, 3, -7, -13, -10, -8, -2, 12, 15 1984-85 12/13 13, 12, 20, 3, 7, -1, -6, -5, -1, 14 1/24 13, 12, 5, 7, 6, 7, -7, -2, -1, 5, -9, -12, -4, 1, 17 1985-86 11/8 31, 30, 30, 21, 22, 15, 18, 18, 30, 26, 7, 7, 12, -2, -3, 2, 5, 3, -3, 2, 8, 18, 19, 19, 24 12/9 15, 5, -2, -3, 0, -6, -5, -2, -2, -3, -3, -1, -3, -5, -6, -5, -6, -8, -7, -9,-7, -7, 2, 16, 18, 14, 13 1986-87 w+ 1/10 18, 13, 9, 17, 18, 6, 0, 7, 13, 6, 11, 5, 9, 17, 20 1987-88 w- 1/1 5, 0, 1 1/17 4, -1, -2, 6, 8, 13, 12, 9, 11, 13, 21, 20 1988-89 c+ 12/22 20, 18, 21, 15, 3, 2, -4, 1, 20 c+ 1/23 5, 1, 0, 4, 0, 6, 6, 19, 20, 15, 12, 3, -14, -15, -11, -13, -10, -7, 13, 7, 17, 10, 11, 12, 16 1990-91 12/19 9, -8, -23, -25, -18, -20, -20, 2, 6, 9, -17, -9, 6, -4, -4, -5, -9, -12, -5, 11, 13, 11, 20 1992-93 w+ 12/3 15, 9, 2, 0, 20, 18 1993-94 11/18 18, 18, 23, 14, 23, 4, 0, 4, 3, 3, 13, 24 1998-99 c+ 12/18 20, 14, 4, -2, 0, 4, 13, 19 2009-10 w 11/28 28, 25, 27, 24, 21, 18, 18, 18, 20, 0, -6, -4, 0, 1, 16, 20, 19 8/8/2011 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ This tabulation was originally compiled in 1966 under the direction of Kenneth A. Rice, Meteorologist in Charge. It was updated in 1972 and as needed starting in 1998. Records prior to 1898 are doubtful because of questionable exposure and lack of standardization. Official U.S. Weather Bureau/National Weather Service records commenced in December, 1898. * For the purpose of this tabulation, "cold spell" is defined as an unbroken series of daily minimum temperatures <= daily normals, if at least one of these temperatures <= 0 F. On August 15, 1998, the original publication was corrected back to 1931 using the above criteria. Daily temperatures for earlier years were unavailable in 1998. There is no documentation in the original publication precisely defining "cold spell", so the criteria for beginning and ending dates prior to 1931 are uncertain. cold spells at boise.txt