Average Temperatures for May at Boise, Idaho (airport) for the 84-year period 1940 through 2022 normal (1991-2020) = 59.6 F degrees RANK RANK AMONG AMONG DATA YEAR COLDEST WARMEST 52.2 1953 w+ 1 84 52.7 1959 c 2 83 53.0 1942 w- 3 82 53.6 1955 c- 4 tie 53.6 2010 w- tie 80 53.7 1977 w+ 6 79 54.0 1943 c+ 7 78 54.1 1950 c+ 8 77 54.3 1978 w- 9 76 54.5 1960 c 10 75 54.7 1981 w- 11 74 54.8 1984 12 73 54.9 1965 w 13 tie 54.9 1982 w- tie tie 54.9 1991 w+ tie 70 55.1 1964 c 16 69 55.4 1974 c+ 17 68 55.5 1996 18 tie 55.5 2011 c- tie tie 55.5 2022 c- tie 65 55.7 1990 21 64 55.8 1999 c+ 22 63 56.0 1962 c- 23 62 56.2 1975 c+ 24 61 56.3 1948 25 tie 56.3 1989 c+ tie tie 56.3 1998 w tie 58 56.5 1967 28 tie 56.5 1983 w+ tie tie 56.6 1945 c- 30 55 56.8 1951 w 31 54 56.9 1995 w+ 32 53 57.2 1980 w+ 33 52 57.5 1970 34 51 57.6 1946 w 35 tie 57.6 1952 tie 49 57.8 1968 c- 37 tie 57.8 1979 tie 47 57.9 1961 39 tie 57.9 1988 tie 45 58.2 1957 w 41 44 58.4 1941 w+ 42 43 58.5 1985 c 43 42 58.6 1944 44 41 58.7 2003 45 tie 58.7 2004 tie 39 58.9 2012 47 38 59.1 1986 48 37 59.1 2002 49 36 59.3 1976 c 50 35 59.4 2000 c 51 tie 59.4 2005 tie 33 59.5 1956 c+ 53 tie 59.5 2021 tie 31 59.7 2017 55 30 59.8 2019 w 56 29 59.9 1954 c- 57 28 60.0 1971 c+ 58 27 60.5 1973 59 tie 60.5 2008 c tie tie 60.5 2020 tie 24 60.6 1972 w+ 62 23 60.7 2014 63 22 60.9 1963 c 64 21 61.0 1994 w+ 65 tie 61.0 2006 tie tie 61.0 2013 tie 18 61.1 1969 w 68 tie 61.1 2016 w- tie 16 61.3 1940 w+ 70 15 61.4 2001 71 14 61.5 1949 72 tie 61.5 1966 w+ tie 12 61.6 2009 74 11 62.1 2012 W- 75 tie 62.1 2015 w- tie 9 62.2 1947 w- 77 tie 62.2 1987 w+ tie 7 62.5 2007 79 6 62.9 1997 w 80 5 63.1 1993 w+ 81 4 63.8 2018 82 3 64.3 1958 w- 83 tie 64.3 1992 w+ tie 1 6/2/2022 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ very strong c++ or w++ average may temperatures at boise, airport.txt