Average Fall Temperatures (Sep,Oct,Nov) Boise, Idaho for the 72-season period 1940 through 2011 normal(1981-10) = 52.6 F degrees RANK RANK AMONG AMONG DATA YEAR COLDEST WARMEST 44.1 1985 1 72 47.8 1961 c- 2 71 48.0 1946 w 3 tie 48.0 1959 c tie 69 48.7 1984 5 68 49.1 1982 w+ 6 67 49.3 1971 c+ 7 tie 49.3 2000 c- tie 65 49.5 1970 c+ 9 64 49.7 1993 w 10 63 49.8 1964 c+ 11 62 49.9 1956 c+ 12 tie 49.9 1969 w tie tie 49.9 1994 w+ tie 59 50.1 1986 w- 15 58 50.3 1941 w+ 16 tie 50.3 1972 w+ tie tie 50.3 1978 tie 55 50.4 1948 19 tie 50.4 1957 w tie 53 50.5 1951 w+ 21 tie 50.5 1955 c+ tie 51 50.8 1992 w 23 50 51.0 1940 w+ 24 49 51.3 1980 w- 25 tie 51.3 1989 c- tie 47 51.4 1947 c 27 46 51.5 2005 28 45 51.6 1945 c- 29 tie 51.6 1977 w+ tie 43 51.7 1991 w+ 31 tie 51.7 2002 w tie 41 51.8 1942 c 33 tie 51.8 1996 tie tie 51.8 2004 w- tie 38 51.9 1976 36 37 52.0 1954 c- 37 36 52.1 1979 38 tie 52.1 1981 tie 34 52.2 1949 40 tie 52.2 1983 c- tie 32 52.4 1952 42 tie 52.4 1973 c+ tie tie 52.4 1975 c+ tie 29 52.5 1958 45 tie 52.5 1968 tie tie 52.5 2007 c- tie 26 52.6 1965 w+ 48 25 52.9 1966 49 24 53.1 1960 c- 50 tie 53.1 1974 c+ tie tie 53.1 1995 tie 21 53.2 1962 c+ 53 20 53.3 1967 54 tie 53.3 2006 w- tie 18 53.5 1943 c 56 tie 53.5 1944 w- tie tie 53.5 2009 w tie 15 53.7 1987 w 59 14 54.0 1990 w- 60 13 54.1 1988 c+ 61 tie 54.1 2003 tie 11 54.2 1950 c+ 63 tie 54.2 1997 w+ tie 9 54.4 2008 65 8 54.5 2010 c+ 66 7 54.7 1953 w 67 6 55.0 1998 68 5 55.1 1999 c 69 4 55.3 2001 70 tie 55.3 2011 c tie 2 57.5 1963 w+ 72 1 12/12/2011 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ average fall temperatures at boise, airport.txt