Thunderstorms and Heavy Rains Across Portions of the Central and Eastern US; Heat Expands to Portions of the East

Widespread showers and thunderstorms, some severe, may produce heavy downpours and flash flooding across much of the eastern and central U.S. Dangerous heat will continue in the Pacific Northwest and expand across portions of the East. Deep tropical moisture and associated thunderstorms will bring heavy rainfall and localized flash flooding across portions of Florida into the central Gulf Coast. Read More >

Annual Heat Index Statistics
Highest Heat Index By Year
All HI Readings >=110
All HI Readings >=110 By Summer

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
2024	57	30	17	5	0
Total:	3997	2331	1060	351	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 (37 yrs, most recently 2024)

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

(**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
2024	6/25/2024 7/3/2024 7/31/2024	106

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

(**No heat index data for 1965-1969)

All Heat Index Readings of 110 or greater

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

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

(**No heat index data for 1965-1969)

All Heat Index Readings of 110 or greater by Year

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 30, 2024

(**No heat index data for 1965-1969)

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Thunderstorms and Heavy Rains Across Portions of the Central and Eastern US; Heat Expands to Portions of the East

Heat Index Climatology for Evansville, IN