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Built 2026-10-19 (19 October 2026)

Nights at or above 20 C (68 F) in Chicago

Chicago has had nights with a minimum temperature at or above 20 C (68 F) in 68 years, most in 2020 with 56. Days per year, season span, streaks and every date.

Key Facts for Chicago

  • Chicago has had nights with a minimum temperature at or above 20 C (68 F) in 68 years, 1,766 days in all.
  • The most in one year was 56 days in 2020.
  • In 2026, the latest year on file, there were 42 such days.
  • The earliest first date in a year was 16 April 2002.
  • The latest last date in a year was 30 October 2024.
  • The longest run inside a single year was 17 days in 2020.
  • 2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

68 years, 1,766 days
Nights at or above 20 C (68 F) per year in Chicago Days per year in Chicago with a minimum temperature at or above 20 C (68 F). The line is the decade average. The most was 56 in 2020. Grey bars are years with under 90 percent of days observed, left out of rankings. 02040601959: 401960: 241961: 161962: 111963: 81964: 141965: 81966: 121967: 101968: 241969: 291970: 351971: 311972: 291973: 351974: 111975: 361976: 141977: 321978: 201979: 271980: 311981: 131982: 131983: 321984: 91985: 91986: 151987: 301988: 301989: 161990: 211991: 221992: 61993: 211994: 181995: 481996: 121997: 171998: 281999: 282000: 132001: 272002: 342003: 142004: 82005: 362006: 312007: 332008: 212009: 122010: 442011: 382012: 442013: 252014: 232015: 212016: 412017: 262018: 492019: 342020: 562021: 502022: 392023: 362024: 372025: 472026: 421959196919791989199920092019
Days per year in Chicago with a minimum temperature at or above 20 C (68 F). The line is the decade average. The most was 56 in 2020. Grey bars are years with under 90 percent of days observed, left out of rankings.
Nights at or above 20 C (68 F) per year in Chicago
YearDaysDecade average
19594040
19602415.6
19611615.6
19621115.6
1963815.6
19641415.6
1965815.6
19661215.6
19671015.6
19682415.6
19692915.6
19703527
19713127
19722927
19733527
19741127
19753627
19761427
19773227
19782027
19792727
19803119.8
19811319.8
19821319.8
19833219.8
1984919.8
1985919.8
19861519.8
19873019.8
19883019.8
19891619.8
19902122.1
19912222.1
1992622.1
19932122.1
19941822.1
19954822.1
19961222.1
19971722.1
19982822.1
19992822.1
20001322.9
20012722.9
20023422.9
20031422.9
2004822.9
20053622.9
20063122.9
20073322.9
20082122.9
20091222.9
20104434.5
20113834.5
20124434.5
20132534.5
20142334.5
20152134.5
20164134.5
20172634.5
20184934.5
20193434.5
20205643.9
20215043.9
20223943.9
20233643.9
20243743.9
20254743.9
20264243.9

Season Span

earliest 16 April, latest 30 October
First to last qualifying date each year in Chicago For each year, a bar from the first to the last day in Chicago meeting 20 C (68 F). Long bars mean a long season. 1959: 5 May 1959 to 8 September 19591960: 29 June 1960 to 8 September 19601961: 1 June 1961 to 12 September 19611962: 15 May 1962 to 13 September 19621963: 6 June 1963 to 31 July 19631964: 23 May 1964 to 8 September 19641965: 22 July 1965 to 21 September 19651966: 5 June 1966 to 21 August 19661967: 7 June 1967 to 17 August 19671968: 7 June 1968 to 23 August 19681969: 26 June 1969 to 15 September 19691970: 29 April 1970 to 21 September 19701971: 18 May 1971 to 2 October 19711972: 11 July 1972 to 25 September 19721973: 11 June 1973 to 26 September 19731974: 3 July 1974 to 11 September 19741975: 17 June 1975 to 29 August 19751976: 16 April 1976 to 27 August 19761977: 22 May 1977 to 18 September 19771978: 25 June 1978 to 11 September 19781979: 8 May 1979 to 21 October 19791980: 11 July 1980 to 21 September 19801981: 14 June 1981 to 31 August 19811982: 6 July 1982 to 13 September 19821983: 26 June 1983 to 9 September 19831984: 8 June 1984 to 29 August 19841985: 27 June 1985 to 7 September 19851986: 22 June 1986 to 27 September 19861987: 27 May 1987 to 16 August 19871988: 14 June 1988 to 19 August 19881989: 22 June 1989 to 6 September 19891990: 12 June 1990 to 6 September 19901991: 24 May 1991 to 15 September 19911992: 8 July 1992 to 16 September 19921993: 24 June 1993 to 13 September 19931994: 15 June 1994 to 15 September 19941995: 18 June 1995 to 31 August 19951996: 18 May 1996 to 22 August 19961997: 20 June 1997 to 16 August 19971998: 21 June 1998 to 26 September 19981999: 6 June 1999 to 28 August 19992000: 10 June 2000 to 10 September 20002001: 13 June 2001 to 7 September 20012002: 16 April 2002 to 30 September 20022003: 25 June 2003 to 13 September 20032004: 8 June 2004 to 15 September 20042005: 5 June 2005 to 5 October 20052006: 28 May 2006 to 27 August 20062007: 7 June 2007 to 6 October 20072008: 6 June 2008 to 13 September 20082009: 20 June 2009 to 17 August 20092010: 24 May 2010 to 21 September 20102011: 31 May 2011 to 3 September 20112012: 27 May 2012 to 6 September 20122013: 16 June 2013 to 19 September 20132014: 2 June 2014 to 4 September 20142015: 10 June 2015 to 8 September 20152016: 11 June 2016 to 8 September 20162017: 11 June 2017 to 26 September 20172018: 26 May 2018 to 9 October 20182019: 25 May 2019 to 1 October 20192020: 25 May 2020 to 2 September 20202021: 21 May 2021 to 10 October 20212022: 10 May 2022 to 17 September 20222023: 31 May 2023 to 4 October 20232024: 4 June 2024 to 30 October 20242025: 3 June 2025 to 4 October 20252026: 5 June 2026 to 9 September 202619591968197719861995200420132022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Chicago meeting 20 C (68 F). Long bars mean a long season.
First to last qualifying date each year in Chicago
YearFirst dateLast date
19591959-05-051959-09-08
19601960-06-291960-09-08
19611961-06-011961-09-12
19621962-05-151962-09-13
19631963-06-061963-07-31
19641964-05-231964-09-08
19651965-07-221965-09-21
19661966-06-051966-08-21
19671967-06-071967-08-17
19681968-06-071968-08-23
19691969-06-261969-09-15
19701970-04-291970-09-21
19711971-05-181971-10-02
19721972-07-111972-09-25
19731973-06-111973-09-26
19741974-07-031974-09-11
19751975-06-171975-08-29
19761976-04-161976-08-27
19771977-05-221977-09-18
19781978-06-251978-09-11
19791979-05-081979-10-21
19801980-07-111980-09-21
19811981-06-141981-08-31
19821982-07-061982-09-13
19831983-06-261983-09-09
19841984-06-081984-08-29
19851985-06-271985-09-07
19861986-06-221986-09-27
19871987-05-271987-08-16
19881988-06-141988-08-19
19891989-06-221989-09-06
19901990-06-121990-09-06
19911991-05-241991-09-15
19921992-07-081992-09-16
19931993-06-241993-09-13
19941994-06-151994-09-15
19951995-06-181995-08-31
19961996-05-181996-08-22
19971997-06-201997-08-16
19981998-06-211998-09-26
19991999-06-061999-08-28
20002000-06-102000-09-10
20012001-06-132001-09-07
20022002-04-162002-09-30
20032003-06-252003-09-13
20042004-06-082004-09-15
20052005-06-052005-10-05
20062006-05-282006-08-27
20072007-06-072007-10-06
20082008-06-062008-09-13
20092009-06-202009-08-17
20102010-05-242010-09-21
20112011-05-312011-09-03
20122012-05-272012-09-06
20132013-06-162013-09-19
20142014-06-022014-09-04
20152015-06-102015-09-08
20162016-06-112016-09-08
20172017-06-112017-09-26
20182018-05-262018-10-09
20192019-05-252019-10-01
20202020-05-252020-09-02
20212021-05-212021-10-10
20222022-05-102022-09-17
20232023-05-312023-10-04
20242024-06-042024-10-30
20252025-06-032025-10-04
20262026-06-052026-09-09

Every Year

Nights at or above 20 C (68 F) per year in Chicago
YearDaysFirst dateLast dateLongest streak in yearCoverage
2026425 June 20269 September 20268 daysIncomplete, not ranked
2025473 June 20254 October 202516 daysComplete
2024374 June 202430 October 20249 daysComplete
20233631 May 20234 October 20236 daysComplete
20223910 May 202217 September 20228 daysComplete
20215021 May 202110 October 20217 daysComplete
20205625 May 20202 September 202017 daysComplete
20193425 May 20191 October 201910 daysComplete
20184926 May 20189 October 20189 daysComplete
20172611 June 201726 September 20175 daysComplete
20164111 June 20168 September 201613 daysComplete
20152110 June 20158 September 20158 daysComplete
2014232 June 20144 September 20146 daysComplete
20132516 June 201319 September 20139 daysComplete
20124427 May 20126 September 201211 daysComplete
20113831 May 20113 September 201115 daysComplete
20104424 May 201021 September 20108 daysComplete
20091220 June 200917 August 20097 daysComplete
2008216 June 200813 September 20083 daysComplete
2007337 June 20076 October 20075 daysComplete
20063128 May 200627 August 20069 daysComplete
2005365 June 20055 October 20057 daysComplete
200488 June 200415 September 20042 daysComplete
20031425 June 200313 September 20034 daysComplete
20023416 April 200230 September 20027 daysComplete
20012713 June 20017 September 20015 daysComplete
20001310 June 200010 September 20003 daysComplete
1999286 June 199928 August 199916 daysComplete
19982821 June 199826 September 19987 daysComplete
19971720 June 199716 August 19976 daysComplete
19961218 May 199622 August 19963 daysComplete
19954818 June 199531 August 199514 daysComplete
19941815 June 199415 September 19944 daysComplete
19932124 June 199313 September 19935 daysComplete
199268 July 199216 September 19922 daysComplete
19912224 May 199115 September 19916 daysComplete
19902112 June 19906 September 19904 daysComplete
19891622 June 19896 September 19893 daysComplete
19883014 June 198819 August 198812 daysComplete
19873027 May 198716 August 19878 daysComplete
19861522 June 198627 September 19864 daysComplete
1985927 June 19857 September 19855 daysComplete
198498 June 198429 August 19843 daysComplete
19833226 June 19839 September 19839 daysComplete
1982136 July 198213 September 19824 daysComplete
19811314 June 198131 August 19814 daysComplete
19803111 July 198021 September 19808 daysComplete
1979278 May 197921 October 19796 daysComplete
19782025 June 197811 September 19785 daysComplete
19773222 May 197718 September 19778 daysComplete
19761416 April 197627 August 19764 daysComplete
19753617 June 197529 August 19757 daysComplete
1974113 July 197411 September 19742 daysComplete
19733511 June 197326 September 197311 daysComplete
19722911 July 197225 September 19727 daysComplete
19713118 May 19712 October 19719 daysComplete
19703529 April 197021 September 19708 daysComplete
19692926 June 196915 September 19697 daysComplete
1968247 June 196823 August 19686 daysComplete
1967107 June 196717 August 19675 daysComplete
1966125 June 196621 August 19663 daysComplete
1965822 July 196521 September 19654 daysComplete
19641423 May 19648 September 19645 daysComplete
196386 June 196331 July 19633 daysComplete
19621115 May 196213 September 19625 daysComplete
1961161 June 196112 September 19613 daysComplete
19602429 June 19608 September 19609 daysComplete
1959405 May 19598 September 195911 daysComplete
Decade averages for Nights at or above 20 C (68 F) in Chicago
DecadeAverage days per yearYears counted
1950s40.01
1960s15.610
1970s27.010
1980s19.810
1990s22.110
2000s22.910
2010s34.510
2020s44.26

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 Nights at or above 20 C (68 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).