Annual Heat Index Statistics
The table below depicts the number of days each year where the heat index reached or exceeded each given threshold.
Year | >90 | >95 | >100 | >105 | >110 |
1950 | 23 | 6 | 2 | 0 | 0 |
1951 | 51 | 32 | 12 | 3 | 2 |
1952 | 69 | 43 | 29 | 13 | 3 |
1953 | 76 | 43 | 23 | 11 | 1 |
1954 | 80 | 57 | 29 | 10 | 2 |
1955 | 57 | 36 | 11 | 2 | 0 |
1956 | 58 | 25 | 13 | 6 | 0 |
1957 | 46 | 31 | 10 | 1 | 0 |
1958 | 53 | 29 | 9 | 1 | 0 |
1959 | 60 | 32 | 12 | 1 | 0 |
1960 | 58 | 27 | 11 | 3 | 0 |
1961 | 58 | 31 | 10 | 2 | 2 |
1962 | 68 | 36 | 18 | 4 | 1 |
1963 | 52 | 25 | 12 | 4 | 0 |
1964 | 67 | 40 | 24 | 6 | 1 |
1970 | 55 | 31 | 8 | 2 | 0 |
1971 | 68 | 40 | 19 | 9 | 4 |
1972 | 42 | 23 | 7 | 0 | 0 |
1973 | 70 | 35 | 8 | 1 | 0 |
1974 | 43 | 23 | 7 | 2 | 0 |
1975 | 68 | 39 | 9 | 0 | 0 |
1976 | 36 | 16 | 7 | 1 | 0 |
1977 | 65 | 42 | 26 | 11 | 5 |
1978 | 67 | 38 | 25 | 7 | 2 |
1979 | 56 | 33 | 13 | 0 | 0 |
1980 | 78 | 60 | 36 | 16 | 5 |
1981 | 56 | 36 | 18 | 10 | 1 |
1982 | 44 | 26 | 12 | 2 | 2 |
1983 | 73 | 56 | 28 | 13 | 3 |
1984 | 47 | 22 | 4 | 0 | 0 |
1985 | 48 | 25 | 8 | 0 | 0 |
1986 | 63 | 34 | 16 | 4 | 0 |
1987 | 80 | 54 | 24 | 7 | 2 |
1988 | 61 | 42 | 31 | 19 | 5 |
1989 | 57 | 38 | 21 | 5 | 0 |
1990 | 53 | 37 | 18 | 8 | 1 |
1991 | 70 | 47 | 21 | 2 | 1 |
1992 | 34 | 21 | 12 | 3 | 0 |
1993 | 65 | 53 | 34 | 14 | 4 |
1994 | 55 | 32 | 18 | 3 | 0 |
1995 | 70 | 49 | 30 | 16 | 7 |
1996 | 46 | 22 | 7 | 1 | 0 |
1997 | 42 | 27 | 9 | 5 | 1 |
1998 | 73 | 33 | 19 | 9 | 1 |
1999 | 50 | 34 | 16 | 8 | 2 |
2000 | 43 | 25 | 7 | 3 | 1 |
2001 | 53 | 31 | 15 | 4 | 0 |
2002 | 78 | 42 | 23 | 4 | 0 |
2003 | 36 | 26 | 10 | 2 | 0 |
2004 | 37 | 21 | 6 | 3 | 1 |
2005 | 67 | 34 | 11 | 5 | 0 |
2006 | 48 | 31 | 13 | 4 | 1 |
2007 | 72 | 31 | 17 | 6 | 1 |
2008 | 40 | 24 | 4 | 1 | 0 |
2009 | 31 | 17 | 7 | 1 | 0 |
2010 | 82 | 51 | 31 | 13 | 2 |
2011 | 64 | 40 | 23 | 8 | 4 |
2012 | 74 | 36 | 22 | 15 | 3 |
2013 | 46 | 27 | 9 | 1 | 0 |
2014 | 39 | 21 | 9 | 1 | 1 |
2015 | 51 | 24 | 8 | 4 | 1 |
2016 | 72 | 46 | 16 | 2 | 0 |
2017 | 46 | 18 | 6 | 2 | 0 |
2018 | 85 | 46 | 16 | 4 | 0 |
2019 | 68 | 36 | 7 | 1 | 0 |
2020 | 48 | 26 | 4 | 0 | 0 |
2021 | 55 | 34 | 10 | 2 | 0 |
2022 | 53 | 29 | 19 | 7 | 3 |
2023 | 41 | 24 | 14 | 8 | 2 |
Total: | 3940 | 2301 | 1043 | 346 | 78 |
Avg per year | 57 | 33 | 15 | 5 | 1 |
Most in 1 Year | 85 (2018) | 60 (1980) | 36 (1980) | 19 (1988) | 7 (1995) |
Least in 1 Year | 23 (1950) | 6 (1950) | 2 (1950) | 0 (7 yrs, most recently 2020) | 0 (36 yrs, most recently 2023) |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1969)
Highest Heat Index By Year
Year | Date | Heat Index |
1950 | 6/25/1950 | 104 |
1951 | 8/30/1951 | 112 |
1952 | 6/29/1952 | 114 |
1953 | 6/20/1953 | 111 |
1954 | 7/14/1954 | 115 |
1955 | 7/27/1955 7/28/1955 | 106 |
1956 | 7/27/1956 8/5/1956 | 108 |
1957 | 7/4/1957 | 106 |
1958 | 7/27/1958 | 106 |
1959 | 7/29/1959 | 106 |
1960 | 6/22/1960 8/3/1960 8/6/1960 | 106 |
1961 | 7/29/1961 | 111 |
1962 | 7/14/1962 | 110 |
1963 | 8/3/1963 | 109 |
1964 | 8/3/1964 | 112 |
1970 | 7/2/1970 | 106 |
1971 | 6/27/1971 7/8/1971 | 111 |
1972 | 8/18/1972 8/19/1972 | 103 |
1973 | 7/3/1973 | 107 |
1974 | 7/15/1974 | 106 |
1975 | 9/3/1975 | 104 |
1976 | 7/14/1976 | 106 |
1977 | 7/17/1977 | 113 |
1978 | 6/26/1978 6/27/1978 | 110 |
1979 | 8/7/1979 8/8/1979 | 103 |
1980 | 7/9/1980 7/15/1980 | 112 |
1981 | 6/9/1981 | 111 |
1982 | 8/4/1982 | 111 |
1983 | 7/20/1983 7/21/1983 | 111 |
1984 | 7/9/1984 | 104 |
1985 | 7/13/1985 | 103 |
1986 | 7/16/1986 | 106 |
1987 | 8/3/1987 | 118 |
1988 | 7/17/1988 8/16/1988 | 114 |
1989 | 8/5/1989 | 109 |
1990 | 7/8/1990 | 110 |
1991 | 6/30/1991 | 110 |
1992 | 8/9/1992 | 109 |
1993 | 7/26/1993 | 113 |
1994 | 6/21/1994 | 107 |
1995 | 8/15/1995 8/18/1995 | 113 |
1996 | 7/19/1996 | 106 |
1997 | 7/26/1997 | 112 |
1998 | 7/19/1998 | 112 |
1999 | 7/30/1999 | 114 |
2000 | 8/9/2000 | 110 |
2001 | 7/7/2001 7/8/2001 | 107 |
2002 | 7/9/2002 7/21/2002 8/4/2002 | 106 |
2003 | 8/22/2003 | 107 |
2004 | 7/22/2004 | 111 |
2005 | 7/21/2005 7/24/2005 | 109 |
2006 | 8/10/2006 | 110 |
2007 | 8/8/2007 | 110 |
2008 | 7/21/2008 | 106 |
2009 | 6/22/2009 | 106 |
2010 | 8/3/2010 | 112 |
2011 | 7/12/2011 | 116 |
2012 | 7/1/2012 7/19/2012 7/24/2012 | 110 |
2013 | 8/31/2013 | 105 |
2014 | 8/23/2014 | 110 |
2015 | 7/29/2015 | 110 |
2016 | 6/16/2016 7/23/2016 | 106 |
2017 | 7/21/2017 7/22/2017 | 106 |
2018 | 7/4/2018 | 108 |
2019 | 7/10/2019 | 106 |
2020 | 8/10/2020 | 104 |
2021 | 8/10/2021 | 106 |
2022 | 6/13/2022 7/5/2022 7/20/2022 |
110 |
2023 | 8/25/2023 | 114 |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1969)
Date | Heat Index |
8/3/1987 | 118 |
7/12/2011 | 116 |
7/14/1954 | 115 |
8/25/2023 | 114 |
7/11/2011 | 114 |
7/30/1999 | 114 |
7/17/1988 | 114 |
8/16/1988 | 114 |
6/29/1952 | 114 |
7/26/1993 | 113 |
8/15/1995 | 113 |
8/18/1995 | 113 |
8/2/1987 | 113 |
8/15/1988 | 113 |
7/17/1977 | 113 |
8/3/2010 | 112 |
8/3/2011 | 112 |
7/28/1993 | 112 |
8/25/1993 | 112 |
7/14/1995 | 112 |
7/26/1997 | 112 |
7/19/1998 | 112 |
7/29/1999 | 112 |
7/9/1980 | 112 |
7/15/1980 | 112 |
8/17/1988 | 112 |
8/18/1988 | 112 |
7/15/1977 | 112 |
7/16/1977 | 112 |
8/3/1964 | 112 |
8/30/1951 | 112 |
8/24/2023 | 111 |
7/22/2004 | 111 |
7/13/1995 | 111 |
8/19/1995 | 111 |
7/8/1980 | 111 |
6/9/1981 | 111 |
8/4/1982 | 111 |
7/20/1983 | 111 |
7/21/1983 | 111 |
6/27/1971 | 111 |
7/8/1971 | 111 |
7/8/1977 | 111 |
7/29/1961 | 111 |
8/31/1951 | 111 |
6/20/1953 | 111 |
7/20/2022 | 110 |
7/5/2022 | 110 |
6/13/2022 | 110 |
8/4/2010 | 110 |
7/20/2011 | 110 |
7/1/2012 | 110 |
7/19/2012 | 110 |
7/24/2012 | 110 |
8/23/2014 | 110 |
7/29/2015 | 110 |
8/9/2000 | 110 |
8/10/2006 | 110 |
8/8/2007 | 110 |
7/8/1990 | 110 |
6/30/1991 | 110 |
7/18/1993 | 110 |
8/12/1995 | 110 |
8/17/1995 | 110 |
7/11/1980 | 110 |
7/16/1980 | 110 |
8/5/1982 | 110 |
7/1/1983 | 110 |
6/25/1971 | 110 |
7/13/1971 | 110 |
7/18/1977 | 110 |
6/26/1978 | 110 |
6/27/1978 | 110 |
7/30/1961 | 110 |
7/14/1962 | 110 |
6/30/1952 | 110 |
7/27/1952 | 110 |
7/13/1954 | 110 |
(**No heat index data for 1965-1969)
Date | Heat Index |
8/30/1951 | 112 |
8/31/1951 | 111 |
6/29/1952 | 114 |
6/30/1952 | 110 |
7/27/1952 | 110 |
6/20/1953 | 111 |
7/13/1954 | 110 |
7/14/1954 | 115 |
7/29/1961 | 111 |
7/30/1961 | 110 |
7/14/1962 | 110 |
8/3/1964 | 112 |
6/25/1971 | 110 |
6/27/1971 | 111 |
7/8/1971 | 111 |
7/13/1971 | 110 |
7/8/1977 | 111 |
7/15/1977 | 112 |
7/16/1977 | 112 |
7/17/1977 | 113 |
7/18/1977 | 110 |
6/26/1978 | 110 |
6/27/1978 | 110 |
7/8/1980 | 111 |
7/9/1980 | 112 |
7/11/1980 | 110 |
7/15/1980 | 112 |
7/16/1980 | 110 |
6/9/1981 | 111 |
8/4/1982 | 111 |
8/5/1982 | 110 |
7/1/1983 | 110 |
7/20/1983 | 111 |
7/21/1983 | 111 |
8/2/1987 | 113 |
8/3/1987 | 118 |
7/17/1988 | 114 |
8/15/1988 | 113 |
8/16/1988 | 114 |
8/17/1988 | 112 |
8/18/1988 | 112 |
7/8/1990 | 110 |
6/30/1991 | 110 |
7/18/1993 | 110 |
7/26/1993 | 113 |
7/28/1993 | 112 |
8/25/1993 | 112 |
7/13/1995 | 111 |
7/14/1995 | 112 |
8/12/1995 | 110 |
8/15/1995 | 113 |
8/17/1995 | 110 |
8/18/1995 | 113 |
8/19/1995 | 111 |
7/26/1997 | 112 |
7/19/1998 | 112 |
7/29/1999 | 112 |
7/30/1999 | 114 |
8/9/2000 | 110 |
7/22/2004 | 111 |
8/10/2006 | 110 |
8/8/2007 | 110 |
8/3/2010 | 112 |
8/4/2010 | 110 |
7/11/2011 | 114 |
7/12/2011 | 116 |
7/20/2011 | 110 |
8/3/2011 | 112 |
7/1/2012 | 110 |
7/19/2012 | 110 |
7/24/2012 | 110 |
8/23/2014 | 110 |
7/29/2015 | 110 |
6/13/2022 | 110 |
7/5/2022 | 110 |
7/20/2022 | 110 |
8/24/2023 | 111 |
8/25/2023 | 114 |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1969)