National Weather Service United States Department of Commerce
 

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
Total 3923 2443 1226 426 103
Avg per year  65 41 20 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 (25 yrs, most  recently in 2013)

 

Period of Record: January 1, 1950 - December 31, 2018

(**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

 

Period of Record: January 1, 1950 - December 31, 2018

(**No heat index data for 1965-1972)

All Heat Index Readings of 110 or greater
 
Date  Heat Index
7/13/1954 121
8/18/1956 118
8/3/1987 118
8/13/1956 117
8/17/1995 117
8/3/2011 117
7/2/1980 116
7/5/1980 116
7/11/2011 116
6/27/1954 115
7/11/1980 115
8/3/2010 115
7/18/1954 114
7/1/1980 114
7/26/1986 114
8/2/1987 114
8/4/2010 114
7/6/1980 113
8/27/1989 113
8/18/1995 113
8/19/1995 113
8/10/2006 113
8/5/2016 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
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
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
 

Period of Record: January 1, 1950 - December 31, 2018

(**No heat index data for 1965-1972)

 
All Heat Index Readings of 110 or greater by Year
 
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
 
 

Period of Record: January 1, 1950 - December 31, 2018

(**No heat index data for 1965-1972)