Consecutive >= 4 Day Periods of Temperature >= 100 Boise, Idaho (all locations) Since 1875 there have been many 3- and 4-day periods. (This is also true of the years since 1979, except as noted below.) Two 9-day periods: July, 2003...started on the 15th and ended on the 23rd; highest 108 on the 22nd July, 2006...started on the 20th and ended on the 28th; highest 107 on the 22nd Two 7-day periods: July, 1931...started on the 20th and ended on the 26th; highest 108 on the 20th (c+) July, 1960...started on the 15th and ended on the 21st; highest 111 on the 19th (c) One 6-day period July, 2007...started on the 12th and ended on the 17th; highest 105 on the 14th Three 5-day periods: August, 1875 July, 1928 August, 1990...started on the 5th and ended on the 9th; highest 109 on the 6th Periods of >= 4 consecutive days (since 1931) Year Dates Temperatures c+ 1931 7/20 - 7/26 108, 102, 105, 102, 101, 104, 103 w- 1934 7/26 - 7/29 104, 108, 106, 104 1936 7/19 - 7/22 101, 103, 103, 100 w- 1959 7/20 - 7/23 100, 101, 101, 106 c 1960 7/15 - 7/21 100, 103, 102, 103, 111, 103, 102 c 1968 7/6 - 7/9 101, 100, 103, 100 c 1971 7/30 - 8/2 100, 100, 104, 101 c+ 1974 7/16 - 7/19 104, 105, 103, 103 c+ 1975 7/3 - 7/6 102, 102, 102, 101 1990 8/5 - 8/9 106, 109, 103, 107, 100 w+ 1994 7/21 - 7/24 101, 106, 101, 101 w- 2002 7/10 - 7/14 105, 109, 108, 110, 101 2003 7/15 - 7/23 101, 100, 102, 103, 103, 103, 101, 108, 107 2005 7/19 - 7/22 101, 100, 107, 103 2006 7/20 - 7/28 101, 104, 107, 105, 102, 100, 100, 104, 100 2007 7/4 - 7/7 101, 104, 105, 100 7/12 - 7/17 100, 104, 105, 102, 100, 100 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Number of Days Temperature >= 100 Boise, Idaho (Airport) monthly/annual highs in parentheses length of record in brackets June July August September Annual 1940 w+ 3(109) w+ 0(99) w+ 2(100) 0(93) 5(109) 1941 w+ 0(99) w+ 1(101) w+ 0(96) 0(86) 1(101) 1942 c- 0(92) c- 3(104) c- 3(102) c 0(95) 6(104) 1943 0(91) 1(102) 0(99) c 0(93) 1(102) 1944 w- 0(97) w- 0(98) w- 0(99) 0(96) 0(99) 1945 c+ 1(102) c+ 0(97) c+ 0(99) c- 1(102) 2(102) 1946 w+ 0(91) w+ 3(103) w+ 2(105) w 0(93) 5(105) 1947 c 0(90) c 2(104) c 1(103) 0(97) 3(104) 1948 w- 0(98) w- 0(99) w- 0(95) 0(95) 0(99) 1949 w 0(97) w 2(104) w 1(105) 0(93) 3(105) 1950 c+ 1(103) c+ 0(98) c+ 2(101) 1(101) 4(103) 1951 w+ 0(89) w+ 4(103) w+ 1(102) 0(93) 5(103) 1952 c- 0(98) c- 0(97) c- 0(97) 0(90) 0(98) 1953 w+ 0(85) w+ 3(105) w+ 1(100) w 0(96) 4(105) 1954 c- 0(99) c- 1(100) c- 0(98) 0(95) 1(100) 1955 c+ 1(102) c+ 4(104) c+ 1(105) 0(98) 6(104) 1956 c+ 0(97) c+ 3(106) c+ 0(96) 0(91) 3(106) 1957 w- 0(94) w- 1(100) w- 0(98) w 0(93) 1(100) 1958 c- 0(97) c- 1(100) c- 0(99) 0(92) 1(100) 1959 w- 0(99) w- 5(106) w- 0(97) c 0(95) 5(106) 1960 c 0(98) c 11(111) c 0(98) c- 0(94) 11(111) 1961 4(104) 2(102) 3(110) c- 0(87) 9(110) 1962 c- 1(102) c- 0(99) c- 0(97) c+ 0(89) 1(102) 1963 w 0(93) w 0(99) w 2(104) w+ 1(100) 3(104) 1964 c+ 0(95) c+ 2(101) c+ 1(101) c+ 0(86) 3(101) 1965 w+ 0(95) w+ 0(99) w+ 3(103) w+ 0(82) 3(103) 1966 0(95) 0(98) 2(103) 0(99) 2(103) 1967 c- 0(95) c- 3(107) c- 3(103) 0(98) 6(107) 1968 c 1(102) c 7(104) c 0(96) 0(93) 8(104) 1969 w 0(98) w 0(98) w 3(107) w 0(94) 3(107) 1970 c- 3(102) c- 3(101) c- 4(102) c+ 0(89) 10(102) 1971 c 0(98) c 2(100) c 8(104) c+ 0(93) 10(104) 1972 w+ 0(95) w+ 0(99) w+ 3(102) w+ 0(88) 3(102) 1973 c+ 1(103) c+ 3(103) c+ 0(99) c+ 0(93) 4(103) 1974 c+ 5(105) c+ 1(101) c+ 0(97) c+ 0(90) 6(105) 1975 c+ 0(90) c+10(108) c+ 0(97) c+ 0(94) 10(108) 1976 w+ 2(101) w+ 1(103) w+ 0(96) 1(100) 4(103) 1977 w+ 1(101) w+ 2(100) w+ 1(102) w+ 0(93) 4(102) 1978 c 0(92) c 3(105) c 1(102) 0(95) 4(105) 1979 c 1(100) c 3(102) c 0(99) 0(96) 4(102) 1980 0(90) 1(106) 0(96) w- 0(92) 1(106) 1981 c+ 0(97) c+ 1(102) c+ 1(101) 0(96) 2(102) 1982 w+ 0( 93) w+ 0(98) w+ 0(96) w+ 0(92) 0(98) 1983 w- 0(94) w- 2(99) w- 2(106) w- 0(91) 4(106) 1984 c- 1(102) c- 2(104) c- 1(101) 0(95) 4(105) 1985 0(99) 6(101) 0(97) 0(82) 6(101) 1986 0(99) 0(97) 3(105) w- 0(93) 3(105) 1987 w+ 1(101) w+ 1(104) w+ 2(100) w 1(101) 5(104) 1988 c+ 5(104) c+ 3(103) c+ 1(100) c+ 0(95) 9(104) 1989 c 0(98) c 5(108) c 0(99) c- 0(92) 5(108) 1990 3(103) 5(104) 7(109) w- 0(98) 15(109) 1991 w 0(93) w 4(103) w 1(100) w+ 0(94) 5(103) 1992 w 1(100) w 1(106) w 7(103) w 0(96) 9(106) 1993 w+ 0(99) w+ 1(102) w+ 0(98) w 0(95) 1(102) 1994 w+ 1(100) w+ 9(106) w+ 4(105) w+ 0(95) 14(106) 1995 0(96) 1(102) 0(99) 0(97) 1(102) 1996 0(98) 4(103) 3(104) 0(95) 7(104) 1997 w+ 0(91) w+ 1(101) w+ 3(101) w+ 0(97) 4(101) 1998 0(92) 4(108) 5(105) 1(100) 10(108) 1999 c- 1(100) c- 3(102) c- 0(98) c- 0(92) 4(102) 2000 c+ 0(98) 6(102) c+ 3(102) c- 1(101) 10(102) 2001 0(99) 3(106) 6(102) w- 0(92) 9(106) 2002 W- 1(101) w- 6(110) w- 0(98) w- 0(96) 7(110) 2003 2(101) 15(108) 3(102) 0(96) 20(108) 2004 0(97) 3(104) w- 3(102) w- 0(90) 6(104) 2005 1(101) 8(107) 3(105) 0(95) 12(107) 2006 1(101) 13(107) 2(104) w- 0(95) 16(107) 2007 0(98) 14(105) 1(100) c- 1(101) 16(105) 2008 3(105) 1(102) 4(103) 0(94) 8(105) 2009 w- 0(96) w- 4(106) w- 4(102) w- 0(95) 8(106) 2010 1(102) c- 2(102) c+ 3(104) c+ 0(95) 6(104) 2011 0(95) 4(103) 1(100) totals* 47[72] 216[72] 121[72] 8[71] 382[71] averages* 0.7 3.1 1.7 0.1 5.4 *totals and averages computed in October each year 9/1/2011 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ temperatures 100 or higher at boise.txt