Days at or above 30 C (86 F) in Chicago

Chicago has had days with a maximum temperature at or above 30 C (86 F) in 68 years, most in 2012 with 67. Days per year, season span, streaks and every date.

Key Facts for Chicago

Chicago has had days with a maximum temperature at or above 30 C (86 F) in 68 years, 2,632 days in all.
The most in one year was 67 days in 2012.
In 2026, the latest year on file, there were 34 such days.
The earliest first date in a year was 21 March 2012.
The latest last date in a year was 15 October 1962.
The longest run inside a single year was 16 days in 2025.
2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

68 years, 2,632 days

Days per year in Chicago with a maximum temperature at or above 30 C (86 F). The line is the decade average. The most was 67 in 2012. Grey bars are years with under 90 percent of days observed, left out of rankings.

Days at or above 30 C (86 F) per year in Chicago
Year	Days	Decade average
1959	58	58
1960	32	31.5
1961	30	31.5
1962	36	31.5
1963	37	31.5
1964	40	31.5
1965	19	31.5
1966	44	31.5
1967	15	31.5
1968	36	31.5
1969	26	31.5
1970	40	37
1971	53	37
1972	33	37
1973	32	37
1974	20	37
1975	38	37
1976	35	37
1977	48	37
1978	33	37
1979	38	37
1980	43	40.6
1981	26	40.6
1982	28	40.6
1983	59	40.6
1984	38	40.6
1985	30	40.6
1986	34	40.6
1987	58	40.6
1988	63	40.6
1989	27	40.6
1990	29	37.5
1991	60	37.5
1992	15	37.5
1993	29	37.5
1994	41	37.5
1995	58	37.5
1996	23	37.5
1997	30	37.5
1998	45	37.5
1999	45	37.5
2000	24	34
2001	42	34
2002	48	34
2003	26	34
2004	14	34
2005	61	34
2006	35	34
2007	49	34
2008	26	34
2009	15	34
2010	50	42.6
2011	49	42.6
2012	67	42.6
2013	36	42.6
2014	27	42.6
2015	23	42.6
2016	45	42.6
2017	41	42.6
2018	56	42.6
2019	32	42.6
2020	64	48.9
2021	56	48.9
2022	44	48.9
2023	48	48.9
2024	48	48.9
2025	48	48.9
2026	34	48.9

Season Span

earliest 21 March, latest 15 October

For each year, a bar from the first to the last day in Chicago meeting 30 C (86 F). Long bars mean a long season.

First to last qualifying date each year in Chicago
Year	First date	Last date
1959	1959-05-02	1959-09-22
1960	1960-04-23	1960-09-08
1961	1961-05-13	1961-09-11
1962	1962-05-14	1962-10-15
1963	1963-05-08	1963-10-06
1964	1964-05-18	1964-09-10
1965	1965-05-01	1965-09-19
1966	1966-06-04	1966-09-13
1967	1967-05-26	1967-10-04
1968	1968-06-05	1968-09-03
1969	1969-05-27	1969-08-31
1970	1970-04-29	1970-09-21
1971	1971-05-17	1971-10-02
1972	1972-05-20	1972-08-31
1973	1973-06-08	1973-09-03
1974	1974-06-20	1974-09-19
1975	1975-05-18	1975-10-13
1976	1976-06-07	1976-09-08
1977	1977-04-17	1977-09-04
1978	1978-05-26	1978-09-20
1979	1979-05-08	1979-09-12
1980	1980-04-22	1980-09-20
1981	1981-03-31	1981-09-10
1982	1982-05-05	1982-10-06
1983	1983-06-11	1983-10-02
1984	1984-05-18	1984-09-19
1985	1985-04-19	1985-09-19
1986	1986-03-29	1986-09-27
1987	1987-04-20	1987-09-27
1988	1988-05-28	1988-09-18
1989	1989-05-24	1989-09-08
1990	1990-04-24	1990-09-10
1991	1991-05-13	1991-09-15
1992	1992-05-01	1992-08-25
1993	1993-05-09	1993-08-30
1994	1994-04-26	1994-09-16
1995	1995-06-06	1995-09-05
1996	1996-05-17	1996-09-05
1997	1997-06-20	1997-10-08
1998	1998-05-15	1998-09-27
1999	1999-05-28	1999-09-26
2000	2000-05-06	2000-09-19
2001	2001-05-03	2001-09-07
2002	2002-04-15	2002-09-10
2003	2003-04-15	2003-09-07
2004	2004-04-18	2004-09-15
2005	2005-06-04	2005-10-04
2006	2006-05-27	2006-08-23
2007	2007-05-14	2007-10-08
2008	2008-06-02	2008-09-02
2009	2009-06-19	2009-08-16
2010	2010-05-23	2010-10-09
2011	2011-05-10	2011-09-12
2012	2012-03-21	2012-09-12
2013	2013-05-14	2013-09-11
2014	2014-05-08	2014-09-05
2015	2015-06-10	2015-09-07
2016	2016-05-24	2016-09-19
2017	2017-05-16	2017-09-26
2018	2018-05-01	2018-10-03
2019	2019-06-26	2019-10-01
2020	2020-05-24	2020-09-03
2021	2021-04-27	2021-09-27
2022	2022-05-10	2022-09-20
2023	2023-05-07	2023-10-03
2024	2024-05-20	2024-09-21
2025	2025-05-15	2025-10-04
2026	2026-05-17	2026-10-12

Every Year

Days at or above 30 C (86 F) per year in Chicago
Year	Days	First date	Last date	Longest streak in year	Coverage
2026	34	17 May 2026	12 October 2026	7 days	Incomplete, not ranked
2025	48	15 May 2025	4 October 2025	16 days	Complete
2024	48	20 May 2024	21 September 2024	8 days	Complete
2023	48	7 May 2023	3 October 2023	6 days	Complete
2022	44	10 May 2022	20 September 2022	7 days	Complete
2021	56	27 April 2021	27 September 2021	8 days	Complete
2020	64	24 May 2020	3 September 2020	12 days	Complete
2019	32	26 June 2019	1 October 2019	10 days	Complete
2018	56	1 May 2018	3 October 2018	8 days	Complete
2017	41	16 May 2017	26 September 2017	9 days	Complete
2016	45	24 May 2016	19 September 2016	10 days	Complete
2015	23	10 June 2015	7 September 2015	7 days	Complete
2014	27	8 May 2014	5 September 2014	4 days	Complete
2013	36	14 May 2013	11 September 2013	9 days	Complete
2012	67	21 March 2012	12 September 2012	11 days	Complete
2011	49	10 May 2011	12 September 2011	11 days	Complete
2010	50	23 May 2010	9 October 2010	8 days	Complete
2009	15	19 June 2009	16 August 2009	6 days	Complete
2008	26	2 June 2008	2 September 2008	4 days	Complete
2007	49	14 May 2007	8 October 2007	7 days	Complete
2006	35	27 May 2006	23 August 2006	10 days	Complete
2005	61	4 June 2005	4 October 2005	10 days	Complete
2004	14	18 April 2004	15 September 2004	3 days	Complete
2003	26	15 April 2003	7 September 2003	7 days	Complete
2002	48	15 April 2002	10 September 2002	7 days	Complete
2001	42	3 May 2001	7 September 2001	6 days	Complete
2000	24	6 May 2000	19 September 2000	3 days	Complete
1999	45	28 May 1999	26 September 1999	11 days	Complete
1998	45	15 May 1998	27 September 1998	10 days	Complete
1997	30	20 June 1997	8 October 1997	7 days	Complete
1996	23	17 May 1996	5 September 1996	5 days	Complete
1995	58	6 June 1995	5 September 1995	12 days	Complete
1994	41	26 April 1994	16 September 1994	7 days	Complete
1993	29	9 May 1993	30 August 1993	5 days	Complete
1992	15	1 May 1992	25 August 1992	3 days	Complete
1991	60	13 May 1991	15 September 1991	8 days	Complete
1990	29	24 April 1990	10 September 1990	4 days	Complete
1989	27	24 May 1989	8 September 1989	7 days	Complete
1988	63	28 May 1988	18 September 1988	13 days	Complete
1987	58	20 April 1987	27 September 1987	10 days	Complete
1986	34	29 March 1986	27 September 1986	6 days	Complete
1985	30	19 April 1985	19 September 1985	4 days	Complete
1984	38	18 May 1984	19 September 1984	10 days	Complete
1983	59	11 June 1983	2 October 1983	15 days	Complete
1982	28	5 May 1982	6 October 1982	6 days	Complete
1981	26	31 March 1981	10 September 1981	8 days	Complete
1980	43	22 April 1980	20 September 1980	11 days	Complete
1979	38	8 May 1979	12 September 1979	6 days	Complete
1978	33	26 May 1978	20 September 1978	7 days	Complete
1977	48	17 April 1977	4 September 1977	10 days	Complete
1976	35	7 June 1976	8 September 1976	8 days	Complete
1975	38	18 May 1975	13 October 1975	6 days	Complete
1974	20	20 June 1974	19 September 1974	3 days	Complete
1973	32	8 June 1973	3 September 1973	5 days	Complete
1972	33	20 May 1972	31 August 1972	6 days	Complete
1971	53	17 May 1971	2 October 1971	10 days	Complete
1970	40	29 April 1970	21 September 1970	7 days	Complete
1969	26	27 May 1969	31 August 1969	9 days	Complete
1968	36	5 June 1968	3 September 1968	7 days	Complete
1967	15	26 May 1967	4 October 1967	4 days	Complete
1966	44	4 June 1966	13 September 1966	8 days	Complete
1965	19	1 May 1965	19 September 1965	5 days	Complete
1964	40	18 May 1964	10 September 1964	10 days	Complete
1963	37	8 May 1963	6 October 1963	9 days	Complete
1962	36	14 May 1962	15 October 1962	6 days	Complete
1961	30	13 May 1961	11 September 1961	7 days	Complete
1960	32	23 April 1960	8 September 1960	6 days	Complete
1959	58	2 May 1959	22 September 1959	12 days	Complete

Decade averages for Days at or above 30 C (86 F) in Chicago
Decade	Average days per year	Years counted
1950s	58.0	1
1960s	31.5	10
1970s	37.0	10
1980s	40.6	10
1990s	37.5	10
2000s	34.0	10
2010s	42.6	10
2020s	51.3	6

Compare with your own threshold in the threshold explorer. Fahrenheit thresholds are converted to tenths of a degree Celsius once, rounding half up.

Download the Data

Data for Days at or above 30 C (86 F) in Chicago, by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site from the threaded city record.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).