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 | 32 | 16 | 3 | 0 | 0 |
1951 | 64 | 47 | 27 | 9 | 6 |
1952 | 86 | 61 | 40 | 15 | 2 |
1953 | 88 | 60 | 31 | 13 | 2 |
1954 | 91 | 71 | 44 | 20 | 4 |
1955 | 76 | 52 | 28 | 7 | 1 |
1956 | 74 | 43 | 24 | 9 | 5 |
1957 | 57 | 36 | 14 | 4 | 0 |
1958 | 68 | 43 | 20 | 7 | 0 |
1959 | 71 | 30 | 8 | 1 | 0 |
1960 | 64 | 33 | 11 | 2 | 0 |
1961 | 55 | 23 | 4 | 1 | 0 |
1962 | 63 | 32 | 15 | 4 | 1 |
1963 | 55 | 26 | 10 | 3 | 0 |
1964 | 70 | 41 | 15 | 4 | 2 |
1973 | 59 | 34 | 10 | 1 | 0 |
1974 | 45 | 21 | 2 | 1 | 0 |
1975 | 53 | 33 | 9 | 1 | 0 |
1976 | 36 | 17 | 8 | 0 | 0 |
1977 | 69 | 52 | 24 | 12 | 1 |
1978 | 66 | 40 | 23 | 10 | 0 |
1979 | 34 | 19 | 7 | 2 | 0 |
1980 | 81 | 60 | 41 | 23 | 14 |
1981 | 24 | 11 | 7 | 2 | 2 |
1982 | M | M | M | M | M |
1983 | 70 | 51 | 24 | 9 | 3 |
1984 | 46 | 30 | 5 | 0 | 0 |
1985 | 57 | 36 | 17 | 2 | 0 |
1986 | 79 | 56 | 32 | 16 | 6 |
1987 | 93 | 59 | 30 | 13 | 5 |
1988 | 76 | 55 | 35 | 21 | 5 |
1989 | 64 | 46 | 33 | 19 | 5 |
1990 | 64 | 43 | 32 | 7 | 3 |
1991 | 86 | 56 | 28 | 4 | 0 |
1992 | 45 | 32 | 16 | 5 | 1 |
1993 | 79 | 62 | 44 | 18 | 4 |
1994 | 62 | 35 | 17 | 4 | 0 |
1995 | 70 | 49 | 31 | 13 | 4 |
1996 | 51 | 31 | 15 | 3 | 0 |
1997 | 53 | 30 | 14 | 5 | 3 |
1998 | 85 | 45 | 20 | 8 | 0 |
1999 | 66 | 45 | 20 | 12 | 4 |
2000 | 61 | 38 | 23 | 8 | 1 |
2001 | 64 | 40 | 21 | 5 | 2 |
2002 | 90 | 57 | 25 | 5 | 0 |
2003 | 46 | 26 | 11 | 3 | 1 |
2004 | 44 | 21 | 8 | 2 | 0 |
2005 | 74 | 41 | 17 | 8 | 1 |
2006 | 61 | 37 | 18 | 5 | 1 |
2007 | 73 | 35 | 16 | 5 | 0 |
2008 | 50 | 28 | 8 | 0 | 0 |
2009 | 41 | 22 | 13 | 4 | 0 |
2010 | 90 | 60 | 40 | 15 | 3 |
2011 | 72 | 50 | 28 | 8 | 4 |
2012 | 80 | 49 | 29 | 13 | 1 |
2013 | 54 | 33 | 13 | 1 | 0 |
2014 | 67 | 38 | 21 | 10 | 1 |
2015 | 72 | 42 | 17 | 5 | 1 |
2016 | 88 | 64 | 37 | 7 | 1 |
2017 | 60 | 31 | 12 | 4 | 1 |
2018 | 109 | 69 | 31 | 8 | 2 |
2019 | 84 | 51 | 26 | 4 | 1 |
2020 | 66 | 44 | 19 | 2 | 0 |
2021 | 61 | 34 | 14 | 1 | 0 |
2022 | 75 | 50 | 34 | 10 | 5 |
2023 | 52 | 36 | 19 | 12 | 7 |
Total | 4261 | 2658 | 1338 | 455 | 115 |
Avg per year | 65 | 41 | 21 | 7 | 2 |
Most in 1 year | 109 (2018) | 71 (1954) | 44 (1993 &1954) | 23 (1980) | 14 (1980) |
Least in 1 Year | 24 (1981) | 11 (1981) | 2 (1974) | 0 (4 yrs, most recently in 2008) | 0 (27 yrs, most recently in 2021) |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1972 or 1982)
Highest Heat Index By Year
Year | Date | Heat Index |
1950 | 6/25/1950 6/26/1950 | 104 |
1951 | 9/1/1951 | 112 |
1952 | 6/30/1952 | 111 |
1953 | 6/16/1953 6/19/1953 | 110 |
1954 | 7/13/1954 | 121 |
1955 | 7/28/1955 | 110 |
1956 | 8/18/1956 | 118 |
1957 | 8/3/1957 | 109 |
1958 | 7/19/1958 | 109 |
1959 | 7/30/1959 | 107 |
1960 | 8/6/1960 | 108 |
1961 | 7/30/1961 | 105 |
1962 | 8/7/1962 | 112 |
1963 | 8/2/1963 8/3/1963 8/28/1963 | 106 |
1964 | 8/4/1964 | 112 |
1973 | 7/21/1973 | 106 |
1974 | 7/19/1974 | 105 |
1975 | 9/2/1975 | 105 |
1976 | 7/24/1976 | 104 |
1977 | 7/6/1977 | 110 |
1978 | 6/29/1978 | 108 |
1979 | 8/7/1979 | 106 |
1980 | 7/2/1980 7/5/1980 | 116 |
1981 | 7/20/1981 | 112 |
1982 | 7/21/1982 | 107 |
1983 | 7/20/1983 7/21/1983 7/24/1983 | 110 |
1984 | 7/9/1984 | 104 |
1985 | 7/13/1985 | 106 |
1986 | 7/26/1986 | 114 |
1987 | 8/3/1987 | 118 |
1988 | 7/15/1988 | 112 |
1989 | 8/27/1989 | 113 |
1990 | 6/17/1990 7/1/1990 7/8/1990 | 110 |
1991 | 8/8/1991 | 108 |
1992 | 8/9/1992 | 111 |
1993 | 7/26/1993 8/18/1993 | 112 |
1994 | 6/19/1994 6/21/1994 6/22/1994 7/5/1994 | 106 |
1995 | 8/17/1995 | 117 |
1996 | 6/23/1996 7/21/1996 | 106 |
1997 | 7/26/1997 | 112 |
1998 | 7/7/1998 | 109 |
1999 | 7/24/1999 | 112 |
2000 | 8/9/2000 | 110 |
2001 | 7/7/2001 | 111 |
2002 | 7/21/2002 7/22/2002 | 107 |
2003 | 8/22/2003 | 112 |
2004 | 7/13/2004 | 108 |
2005 | 7/22/2005 | 110 |
2006 | 8/10/2006 | 113 |
2007 | 8/8/2007 8/9/2007 | 106 |
2008 | 7/30/2008 | 104 |
2009 | 6/23/2009 | 108 |
2010 | 8/3/2010 | 115 |
2011 | 8/3/2011 | 117 |
2012 | 7/19/2012 | 111 |
2013 | 8/31/2013 | 108 |
2014 | 8/24/2014 | 110 |
2015 | 7/29/2015 | 112 |
2016 | 8/5/2016 | 113 |
2017 | 7/21/2017 | 110 |
2018 | 7/5/2018 7/14/2018 | 111 |
2019 | 8/12/2019 | 110 |
2020 | 7/20/2020 | 107 |
2021 | 7/29/2021 | 106 |
2022 | 7/5/2022 | 114 |
2023 | 8/25/2023 | 117 |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1972)
Date | Heat Index |
7/13/1954 | 121 |
8/18/1956 | 118 |
8/3/1987 | 118 |
8/25/2023 | 117 |
8/13/1956 | 117 |
8/17/1995 | 117 |
8/3/2011 | 117 |
7/2/1980 | 116 |
7/5/1980 | 116 |
7/11/2011 | 116 |
6/30/2023 | 115 |
6/27/1954 | 115 |
7/11/1980 | 115 |
8/3/2010 | 115 |
8/23/2023 | 114 |
7/18/1954 | 114 |
7/1/1980 | 114 |
7/26/1986 | 114 |
8/2/1987 | 114 |
8/4/2010 | 114 |
7/5/2022 | 114 |
8/24/2023 | 113 |
7/6/1980 | 113 |
8/27/1989 | 113 |
8/18/1995 | 113 |
8/19/1995 | 113 |
8/10/2006 | 113 |
8/5/2016 | 113 |
7/20/2022 | 113 |
9/1/1951 | 112 |
8/7/1962 | 112 |
8/4/1964 | 112 |
7/7/1980 | 112 |
7/9/1980 | 112 |
7/15/1980 | 112 |
7/20/1981 | 112 |
7/16/1986 | 112 |
8/1/1987 | 112 |
7/15/1988 | 112 |
8/5/1989 | 112 |
8/28/1989 | 112 |
7/26/1993 | 112 |
8/18/1993 | 112 |
7/26/1997 | 112 |
7/24/1999 | 112 |
8/22/2003 | 112 |
7/10/2011 | 112 |
7/12/2011 | 112 |
7/29/2015 | 112 |
7/6/2022 | 112 |
8/22/2023 | 111 |
8/7/1951 | 111 |
8/31/1951 | 111 |
6/30/1952 | 111 |
7/14/1954 | 111 |
8/4/1956 | 111 |
8/5/1956 | 111 |
8/3/1964 | 111 |
7/12/1980 | 111 |
7/14/1980 | 111 |
8/10/1980 | 111 |
7/19/1986 | 111 |
7/28/1986 | 111 |
6/26/1988 | 111 |
7/17/1988 | 111 |
8/18/1988 | 111 |
8/25/1989 | 111 |
8/29/1989 | 111 |
8/9/1992 | 111 |
7/14/1995 | 111 |
7/27/1997 | 111 |
7/30/1999 | 111 |
7/7/2001 | 111 |
8/14/2010 | 111 |
7/19/2012 | 111 |
7/5/2018 | 111 |
7/14/2018 | 111 |
7/7/2022 | 111 |
8/21/2023 | 110 |
6/29/2023 | 110 |
8/8/1951 | 110 |
8/29/1951 | 110 |
8/30/1951 | 110 |
6/29/1952 | 110 |
6/16/1953 | 110 |
6/19/1953 | 110 |
7/28/1955 | 110 |
7/27/1956 | 110 |
7/6/1977 | 110 |
7/8/1980 | 110 |
7/16/1980 | 110 |
7/31/1980 | 110 |
7/15/1981 | 110 |
7/20/1983 | 110 |
7/21/1983 | 110 |
7/24/1983 | 110 |
7/17/1986 | 110 |
7/18/1986 | 110 |
7/27/1987 | 110 |
7/31/1987 | 110 |
8/16/1988 | 110 |
6/17/1990 | 110 |
7/1/1990 | 110 |
7/8/1990 | 110 |
7/27/1993 | 110 |
8/17/1993 | 110 |
7/28/1997 | 110 |
7/29/1999 | 110 |
8/12/1999 | 110 |
8/9/2000 | 110 |
7/8/2001 | 110 |
7/22/2005 | 110 |
8/24/2014 | 110 |
7/21/2017 | 110 |
8/12/2019 | 110 |
7/8/2022 | 110 |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1972)
Date | Heat Index |
8/7/1951 | 111 |
8/8/1951 | 110 |
8/29/1951 | 110 |
8/30/1951 | 110 |
8/31/1951 | 111 |
9/1/1951 | 112 |
6/29/1952 | 110 |
6/30/1952 | 111 |
6/16/1953 | 110 |
6/19/1953 | 110 |
6/27/1954 | 115 |
7/13/1954 | 121 |
7/14/1954 | 111 |
7/18/1954 | 114 |
7/28/1955 | 110 |
7/27/1956 | 110 |
8/4/1956 | 111 |
8/5/1956 | 111 |
8/13/1956 | 117 |
8/18/1956 | 118 |
8/7/1962 | 112 |
8/3/1964 | 111 |
8/4/1964 | 112 |
7/6/1977 | 110 |
7/1/1980 | 114 |
7/2/1980 | 116 |
7/5/1980 | 116 |
7/6/1980 | 113 |
7/7/1980 | 112 |
7/8/1980 | 110 |
7/9/1980 | 112 |
7/11/1980 | 115 |
7/12/1980 | 111 |
7/14/1980 | 111 |
7/15/1980 | 112 |
7/16/1980 | 110 |
7/31/1980 | 110 |
8/10/1980 | 111 |
7/15/1981 | 110 |
7/20/1981 | 112 |
7/20/1983 | 110 |
7/21/1983 | 110 |
7/24/1983 | 110 |
7/16/1986 | 112 |
7/17/1986 | 110 |
7/18/1986 | 110 |
7/19/1986 | 111 |
7/26/1986 | 114 |
7/28/1986 | 111 |
7/27/1987 | 110 |
7/31/1987 | 110 |
8/1/1987 | 112 |
8/2/1987 | 114 |
8/3/1987 | 118 |
6/26/1988 | 111 |
7/15/1988 | 112 |
7/17/1988 | 111 |
8/16/1988 | 110 |
8/18/1988 | 111 |
8/5/1989 | 112 |
8/25/1989 | 111 |
8/27/1989 | 113 |
8/28/1989 | 112 |
8/29/1989 | 111 |
6/17/1990 | 110 |
7/1/1990 | 110 |
7/8/1990 | 110 |
8/9/1992 | 111 |
7/26/1993 | 112 |
7/27/1993 | 110 |
8/17/1993 | 110 |
8/18/1993 | 112 |
7/14/1995 | 111 |
8/17/1995 | 117 |
8/18/1995 | 113 |
8/19/1995 | 113 |
7/26/1997 | 112 |
7/27/1997 | 111 |
7/28/1997 | 110 |
7/24/1999 | 112 |
7/29/1999 | 110 |
7/30/1999 | 111 |
8/12/1999 | 110 |
8/9/2000 | 110 |
7/7/2001 | 111 |
7/8/2001 | 110 |
8/22/2003 | 112 |
7/22/2005 | 110 |
8/10/2006 | 113 |
8/3/2010 | 115 |
8/4/2010 | 114 |
8/14/2010 | 111 |
7/10/2011 | 112 |
7/11/2011 | 116 |
7/12/2011 | 112 |
8/3/2011 | 117 |
7/19/2012 | 111 |
8/24/2014 | 110 |
7/29/2015 | 112 |
8/5/2016 | 113 |
7/21/2017 | 110 |
7/5/2018 | 111 |
7/14/2018 | 111 |
8/12/2019 | 110 |
7/5/2022 | 114 |
7/6/2022 | 112 |
7/7/2022 | 111 |
7/8/2022 | 110 |
7/20/2022 | 113 |
6/29/2023 | 110 |
6/30/2023 | 115 |
8/21/2023 | 110 |
8/22/2023 | 111 |
8/23/2023 | 114 |
8/24/2023 | 113 |
8/25/2023 | 117 |
Period of Record: January 1, 1950 - September 1, 2023
(**No heat index data for 1965-1972)