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Built 2026-10-19 (19 October 2026)

Days at or above 35 C (95 F) in Chicago

Chicago has had days with a maximum temperature at or above 35 C (95 F) in 49 years, most in 1988 with 22. Days per year, season span, streaks and every date.

Key Facts for Chicago

  • Chicago has had days with a maximum temperature at or above 35 C (95 F) in 49 years, 214 days in all.
  • The most in one year was 22 days in 1988.
  • In 2026, the latest year on file, there were 6 such days.
  • The earliest first date in a year was 27 May 2018.
  • The latest last date in a year was 23 September 2017.
  • The longest run inside a single year was 6 days in 2012.
  • 2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

49 years, 214 days
Days at or above 35 C (95 F) per year in Chicago Days per year in Chicago with a maximum temperature at or above 35 C (95 F). The line is the decade average. The most was 22 in 1988. Grey bars are years with under 90 percent of days observed, left out of rankings. 01020301959: 21960: 31963: 11964: 21966: 21968: 41969: 21970: 11971: 31973: 21974: 31976: 31977: 71978: 11980: 61981: 11982: 21983: 161984: 31985: 21986: 11987: 71988: 221989: 31990: 31991: 121994: 31995: 111997: 11998: 21999: 32001: 32002: 12003: 22005: 52006: 52011: 52012: 172013: 52017: 22018: 62019: 12020: 62021: 12022: 52023: 22024: 42025: 42026: 619591974198619992018
Days per year in Chicago with a maximum temperature at or above 35 C (95 F). The line is the decade average. The most was 22 in 1988. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days at or above 35 C (95 F) per year in Chicago
YearDaysDecade average
195922
196032.3
196312.3
196422.3
196622.3
196842.3
196922.3
197012.9
197132.9
197322.9
197432.9
197632.9
197772.9
197812.9
198066.3
198116.3
198226.3
1983166.3
198436.3
198526.3
198616.3
198776.3
1988226.3
198936.3
199035
1991125
199435
1995115
199715
199825
199935
200133.2
200213.2
200323.2
200553.2
200653.2
201156
2012176
201356
201726
201866
201916
202064
202114
202254
202324
202444
202544
202664

Season Span

earliest 27 May, latest 23 September
First to last qualifying date each year in Chicago For each year, a bar from the first to the last day in Chicago meeting 35 C (95 F). Long bars mean a long season. 1959: 7 September 1959 to 8 September 19591960: 3 September 1960 to 7 September 19601963: 1 July 1963 to 1 July 19631964: 2 August 1964 to 3 August 19641966: 10 July 1966 to 18 July 19661968: 6 August 1968 to 23 August 19681969: 25 June 1969 to 26 June 19691970: 2 July 1970 to 2 July 19701971: 27 June 1971 to 29 June 19711973: 13 July 1973 to 27 August 19731974: 9 July 1974 to 14 July 19741976: 10 July 1976 to 27 August 19761977: 4 June 1977 to 20 July 19771978: 8 September 1978 to 8 September 19781980: 7 July 1980 to 28 August 19801981: 29 June 1981 to 29 June 19811982: 5 July 1982 to 3 August 19821983: 26 June 1983 to 10 September 19831984: 9 July 1984 to 1 September 19841985: 8 June 1985 to 7 September 19851986: 19 July 1986 to 19 July 19861987: 14 June 1987 to 3 August 19871988: 20 June 1988 to 17 August 19881989: 6 July 1989 to 10 July 19891990: 4 July 1990 to 6 September 19901991: 29 June 1991 to 28 August 19911994: 15 June 1994 to 5 July 19941995: 20 June 1995 to 14 August 19951997: 26 July 1997 to 26 July 19971998: 25 June 1998 to 27 June 19981999: 25 July 1999 to 30 July 19992001: 22 July 2001 to 9 August 20012002: 21 July 2002 to 21 July 20022003: 21 August 2003 to 25 August 20032005: 24 June 2005 to 9 August 20052006: 15 July 2006 to 2 August 20062011: 7 June 2011 to 21 July 20112012: 27 May 2012 to 3 August 20122013: 18 July 2013 to 10 September 20132017: 12 June 2017 to 23 September 20172018: 27 May 2018 to 4 August 20182019: 20 July 2019 to 20 July 20192020: 6 July 2020 to 28 August 20202021: 24 August 2021 to 24 August 20212022: 14 June 2022 to 6 August 20222023: 23 August 2023 to 24 August 20232024: 16 June 2024 to 27 August 20242025: 23 June 2025 to 16 August 20252026: 1 July 2026 to 2 September 20261959197019801987199720062020JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Chicago meeting 35 C (95 F). Long bars mean a long season.
First to last qualifying date each year in Chicago
YearFirst dateLast date
19591959-09-071959-09-08
19601960-09-031960-09-07
19631963-07-011963-07-01
19641964-08-021964-08-03
19661966-07-101966-07-18
19681968-08-061968-08-23
19691969-06-251969-06-26
19701970-07-021970-07-02
19711971-06-271971-06-29
19731973-07-131973-08-27
19741974-07-091974-07-14
19761976-07-101976-08-27
19771977-06-041977-07-20
19781978-09-081978-09-08
19801980-07-071980-08-28
19811981-06-291981-06-29
19821982-07-051982-08-03
19831983-06-261983-09-10
19841984-07-091984-09-01
19851985-06-081985-09-07
19861986-07-191986-07-19
19871987-06-141987-08-03
19881988-06-201988-08-17
19891989-07-061989-07-10
19901990-07-041990-09-06
19911991-06-291991-08-28
19941994-06-151994-07-05
19951995-06-201995-08-14
19971997-07-261997-07-26
19981998-06-251998-06-27
19991999-07-251999-07-30
20012001-07-222001-08-09
20022002-07-212002-07-21
20032003-08-212003-08-25
20052005-06-242005-08-09
20062006-07-152006-08-02
20112011-06-072011-07-21
20122012-05-272012-08-03
20132013-07-182013-09-10
20172017-06-122017-09-23
20182018-05-272018-08-04
20192019-07-202019-07-20
20202020-07-062020-08-28
20212021-08-242021-08-24
20222022-06-142022-08-06
20232023-08-232023-08-24
20242024-06-162024-08-27
20252025-06-232025-08-16
20262026-07-012026-09-02

Every Year

Days at or above 35 C (95 F) per year in Chicago
YearDaysFirst dateLast dateLongest streak in yearCoverage
202661 July 20262 September 20262 daysIncomplete, not ranked
2025423 June 202516 August 20251 daysComplete
2024416 June 202427 August 20242 daysComplete
2023223 August 202324 August 20232 daysComplete
2022514 June 20226 August 20222 daysComplete
2021124 August 202124 August 20211 daysComplete
202066 July 202028 August 20202 daysComplete
2019120 July 201920 July 20191 daysComplete
2018627 May 20184 August 20182 daysComplete
2017212 June 201723 September 20171 daysComplete
2013518 July 201310 September 20132 daysComplete
20121727 May 20123 August 20126 daysComplete
201157 June 201121 July 20112 daysComplete
2006515 July 20062 August 20063 daysComplete
2005524 June 20059 August 20051 daysComplete
2003221 August 200325 August 20031 daysComplete
2002121 July 200221 July 20021 daysComplete
2001322 July 20019 August 20011 daysComplete
1999325 July 199930 July 19992 daysComplete
1998225 June 199827 June 19981 daysComplete
1997126 July 199726 July 19971 daysComplete
19951120 June 199514 August 19954 daysComplete
1994315 June 19945 July 19942 daysComplete
19911229 June 199128 August 19913 daysComplete
199034 July 19906 September 19901 daysComplete
198936 July 198910 July 19892 daysComplete
19882220 June 198817 August 19885 daysComplete
1987714 June 19873 August 19873 daysComplete
1986119 July 198619 July 19861 daysComplete
198528 June 19857 September 19851 daysComplete
198439 July 19841 September 19842 daysComplete
19831626 June 198310 September 19832 daysComplete
198225 July 19823 August 19821 daysComplete
1981129 June 198129 June 19811 daysComplete
198067 July 198028 August 19802 daysComplete
197818 September 19788 September 19781 daysComplete
197774 June 197720 July 19772 daysComplete
1976310 July 197627 August 19761 daysComplete
197439 July 197414 July 19742 daysComplete
1973213 July 197327 August 19731 daysComplete
1971327 June 197129 June 19713 daysComplete
197012 July 19702 July 19701 daysComplete
1969225 June 196926 June 19692 daysComplete
196846 August 196823 August 19682 daysComplete
1966210 July 196618 July 19661 daysComplete
196422 August 19643 August 19642 daysComplete
196311 July 19631 July 19631 daysComplete
196033 September 19607 September 19602 daysComplete
195927 September 19598 September 19592 daysComplete
Decade averages for Days at or above 35 C (95 F) in Chicago
DecadeAverage days per yearYears counted
1950s2.01
1960s2.36
1970s2.97
1980s6.310
1990s5.07
2000s3.25
2010s6.06
2020s3.76

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 35 C (95 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 . Last revised (2026-10-17).