National Weather Service United States Department of Commerce

Heavy Rainfall Along the Central Gulf Coast; Thunderstorms from the Plains to the Central Appalachians; Heat Across the East

A system in the Gulf could produce heavy rainfall and flash flooding for portions of the north-central Gulf Coast into Saturday. Widespread showers and thunderstorms are likely this afternoon into Friday from Central Plains into the mid-Mississippi Valley, Ohio Valley and Central Appalachians. Dangerous heat is expected from the Lower Mississippi Valley to the Mid-Atlantic today. Read More >

 

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
2024 69 39 22 7 1
Total 4330 2697 1360 462 116
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 30, 2024

(**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
2024 7/30/2024 110

 

Period of Record: January 1, 1950 - September 30, 2024

(**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
8/25/2023 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
7/30/2024 110
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)

 
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
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
7/30/2024 110
 
 

Period of Record: January 1, 1950 - September 30, 2024

(**No heat index data for 1965-1972)