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Built 2026-10-19 (19 October 2026)

Days with 25 mm (0.98 in) or more of precipitation in Chicago

Chicago has had days with 25 mm (0.98 in) or more of precipitation in 68 years, most in 1983 with 18. Days per year, season span, streaks and every date.

Key Facts for Chicago

  • Chicago has had days with 25 mm (0.98 in) or more of precipitation in 68 years, 539 days in all.
  • The most in one year was 18 days in 1983.
  • In 2026, the latest year on file, there were 12 such days.
  • The earliest first date in a year was 1 January 1965.
  • The latest last date in a year was 31 December 1978.
  • The longest run inside a single year was 2 days in 1959.
  • 2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

68 years, 539 days
Days with 25 mm (0.98 in) or more of precipitation per year in Chicago Days per year in Chicago with 25 mm (0.98 in) or more of precipitation. The line is the decade average. The most was 18 in 1983. Grey bars are years with under 90 percent of days observed, left out of rankings. 051015201959: 81960: 71961: 101962: 31963: 51964: 71965: 81966: 61967: 71968: 41969: 51970: 91971: 61972: 111973: 91974: 51975: 91976: 51977: 61978: 81979: 101980: 81981: 91982: 81983: 181984: 91985: 81986: 61987: 71988: 81989: 51990: 111991: 81992: 41993: 161994: 51995: 91996: 71997: 61998: 101999: 102000: 92001: 112002: 72003: 82004: 92005: 22006: 102007: 102008: 122009: 62010: 62011: 112012: 42013: 82014: 92015: 72016: 72017: 92018: 152019: 102020: 72021: 62022: 62023: 72024: 42025: 72026: 121959196919791989199920092019
Days per year in Chicago with 25 mm (0.98 in) or more of precipitation. The line is the decade average. The most was 18 in 1983. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days with 25 mm (0.98 in) or more of precipitation per year in Chicago
YearDaysDecade average
195988
196076.2
1961106.2
196236.2
196356.2
196476.2
196586.2
196666.2
196776.2
196846.2
196956.2
197097.8
197167.8
1972117.8
197397.8
197457.8
197597.8
197657.8
197767.8
197887.8
1979107.8
198088.6
198198.6
198288.6
1983188.6
198498.6
198588.6
198668.6
198778.6
198888.6
198958.6
1990118.6
199188.6
199248.6
1993168.6
199458.6
199598.6
199678.6
199768.6
1998108.6
1999108.6
200098.4
2001118.4
200278.4
200388.4
200498.4
200528.4
2006108.4
2007108.4
2008128.4
200968.4
201068.6
2011118.6
201248.6
201388.6
201498.6
201578.6
201678.6
201798.6
2018158.6
2019108.6
202077
202167
202267
202377
202447
202577
2026127

Season Span

earliest 1 January, latest 31 December
First to last qualifying date each year in Chicago For each year, a bar from the first to the last day in Chicago meeting 25 mm (0.98 in). Long bars mean a long season. 1959: 26 March 1959 to 4 November 19591960: 12 January 1960 to 19 August 19601961: 4 March 1961 to 19 October 19611962: 2 July 1962 to 10 September 19621963: 29 April 1963 to 2 September 19631964: 5 April 1964 to 15 November 19641965: 1 January 1965 to 24 December 19651966: 20 April 1966 to 9 November 19661967: 31 March 1967 to 21 December 19671968: 25 June 1968 to 28 November 19681969: 24 March 1969 to 10 October 19691970: 12 May 1970 to 6 September 19701971: 4 July 1971 to 15 December 19711972: 12 March 1972 to 12 December 19721973: 21 April 1973 to 13 December 19731974: 26 January 1974 to 13 October 19741975: 10 January 1975 to 14 December 19751976: 21 February 1976 to 6 May 19761977: 28 March 1977 to 25 September 19771978: 7 June 1978 to 31 December 19781979: 13 January 1979 to 24 December 19791980: 28 May 1980 to 7 December 19801981: 22 April 1981 to 7 September 19811982: 2 July 1982 to 24 December 19821983: 2 February 1983 to 11 December 19831984: 15 March 1984 to 27 November 19841985: 23 February 1985 to 18 November 19851986: 17 May 1986 to 3 October 19861987: 14 April 1987 to 28 November 19871988: 30 July 1988 to 27 December 19881989: 18 July 1989 to 1 September 19891990: 25 January 1990 to 27 November 19901991: 27 March 1991 to 26 October 19911992: 17 June 1992 to 1 November 19921993: 4 January 1993 to 25 September 19931994: 23 June 1994 to 27 November 19941995: 9 April 1995 to 10 November 19951996: 9 May 1996 to 29 October 19961997: 21 February 1997 to 26 October 19971998: 9 March 1998 to 6 December 19981999: 2 January 1999 to 4 December 19992000: 18 February 2000 to 9 November 20002001: 24 February 2001 to 24 October 20012002: 2 March 2002 to 18 December 20022003: 4 April 2003 to 18 November 20032004: 20 May 2004 to 1 November 20042005: 19 May 2005 to 20 August 20052006: 16 February 2006 to 1 December 20062007: 1 March 2007 to 23 August 20072008: 17 February 2008 to 27 December 20082009: 26 February 2009 to 22 October 20092010: 13 May 2010 to 22 November 20102011: 4 March 2011 to 14 December 20112012: 23 March 2012 to 20 December 20122013: 29 January 2013 to 31 October 20132014: 20 February 2014 to 10 September 20142015: 9 April 2015 to 28 December 20152016: 24 March 2016 to 28 November 20162017: 30 March 2017 to 14 October 20172018: 20 February 2018 to 1 December 20182019: 29 April 2019 to 26 October 20192020: 28 March 2020 to 22 October 20202021: 12 June 2021 to 24 October 20212022: 30 March 2022 to 14 December 20222023: 3 January 2023 to 17 September 20232024: 7 July 2024 to 5 November 20242025: 31 January 2025 to 18 August 20252026: 8 January 2026 to 1 October 202619591968197719861995200420132022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Chicago meeting 25 mm (0.98 in). Long bars mean a long season.
First to last qualifying date each year in Chicago
YearFirst dateLast date
19591959-03-261959-11-04
19601960-01-121960-08-19
19611961-03-041961-10-19
19621962-07-021962-09-10
19631963-04-291963-09-02
19641964-04-051964-11-15
19651965-01-011965-12-24
19661966-04-201966-11-09
19671967-03-311967-12-21
19681968-06-251968-11-28
19691969-03-241969-10-10
19701970-05-121970-09-06
19711971-07-041971-12-15
19721972-03-121972-12-12
19731973-04-211973-12-13
19741974-01-261974-10-13
19751975-01-101975-12-14
19761976-02-211976-05-06
19771977-03-281977-09-25
19781978-06-071978-12-31
19791979-01-131979-12-24
19801980-05-281980-12-07
19811981-04-221981-09-07
19821982-07-021982-12-24
19831983-02-021983-12-11
19841984-03-151984-11-27
19851985-02-231985-11-18
19861986-05-171986-10-03
19871987-04-141987-11-28
19881988-07-301988-12-27
19891989-07-181989-09-01
19901990-01-251990-11-27
19911991-03-271991-10-26
19921992-06-171992-11-01
19931993-01-041993-09-25
19941994-06-231994-11-27
19951995-04-091995-11-10
19961996-05-091996-10-29
19971997-02-211997-10-26
19981998-03-091998-12-06
19991999-01-021999-12-04
20002000-02-182000-11-09
20012001-02-242001-10-24
20022002-03-022002-12-18
20032003-04-042003-11-18
20042004-05-202004-11-01
20052005-05-192005-08-20
20062006-02-162006-12-01
20072007-03-012007-08-23
20082008-02-172008-12-27
20092009-02-262009-10-22
20102010-05-132010-11-22
20112011-03-042011-12-14
20122012-03-232012-12-20
20132013-01-292013-10-31
20142014-02-202014-09-10
20152015-04-092015-12-28
20162016-03-242016-11-28
20172017-03-302017-10-14
20182018-02-202018-12-01
20192019-04-292019-10-26
20202020-03-282020-10-22
20212021-06-122021-10-24
20222022-03-302022-12-14
20232023-01-032023-09-17
20242024-07-072024-11-05
20252025-01-312025-08-18
20262026-01-082026-10-01

Every Year

Days with 25 mm (0.98 in) or more of precipitation per year in Chicago
YearDaysFirst dateLast dateLongest streak in yearCoverage
2026128 January 20261 October 20262 daysIncomplete, not ranked
2025731 January 202518 August 20252 daysComplete
202447 July 20245 November 20242 daysComplete
202373 January 202317 September 20231 daysComplete
2022630 March 202214 December 20221 daysComplete
2021612 June 202124 October 20211 daysComplete
2020728 March 202022 October 20201 daysComplete
20191029 April 201926 October 20192 daysComplete
20181520 February 20181 December 20182 daysComplete
2017930 March 201714 October 20172 daysComplete
2016724 March 201628 November 20161 daysComplete
201579 April 201528 December 20151 daysComplete
2014920 February 201410 September 20141 daysComplete
2013829 January 201331 October 20132 daysComplete
2012423 March 201220 December 20121 daysComplete
2011114 March 201114 December 20112 daysComplete
2010613 May 201022 November 20102 daysComplete
2009626 February 200922 October 20091 daysComplete
20081217 February 200827 December 20082 daysComplete
2007101 March 200723 August 20071 daysComplete
20061016 February 20061 December 20061 daysComplete
2005219 May 200520 August 20051 daysComplete
2004920 May 20041 November 20041 daysComplete
200384 April 200318 November 20031 daysComplete
200272 March 200218 December 20021 daysComplete
20011124 February 200124 October 20012 daysComplete
2000918 February 20009 November 20001 daysComplete
1999102 January 19994 December 19991 daysComplete
1998109 March 19986 December 19982 daysComplete
1997621 February 199726 October 19971 daysComplete
199679 May 199629 October 19961 daysComplete
199599 April 199510 November 19952 daysComplete
1994523 June 199427 November 19942 daysComplete
1993164 January 199325 September 19932 daysComplete
1992417 June 19921 November 19921 daysComplete
1991827 March 199126 October 19912 daysComplete
19901125 January 199027 November 19902 daysComplete
1989518 July 19891 September 19892 daysComplete
1988830 July 198827 December 19881 daysComplete
1987714 April 198728 November 19872 daysComplete
1986617 May 19863 October 19861 daysComplete
1985823 February 198518 November 19851 daysComplete
1984915 March 198427 November 19841 daysComplete
1983182 February 198311 December 19832 daysComplete
198282 July 198224 December 19821 daysComplete
1981922 April 19817 September 19811 daysComplete
1980828 May 19807 December 19801 daysComplete
19791013 January 197924 December 19791 daysComplete
197887 June 197831 December 19782 daysComplete
1977628 March 197725 September 19771 daysComplete
1976521 February 19766 May 19761 daysComplete
1975910 January 197514 December 19751 daysComplete
1974526 January 197413 October 19741 daysComplete
1973921 April 197313 December 19731 daysComplete
19721112 March 197212 December 19721 daysComplete
197164 July 197115 December 19712 daysComplete
1970912 May 19706 September 19701 daysComplete
1969524 March 196910 October 19691 daysComplete
1968425 June 196828 November 19681 daysComplete
1967731 March 196721 December 19671 daysComplete
1966620 April 19669 November 19661 daysComplete
196581 January 196524 December 19651 daysComplete
196475 April 196415 November 19641 daysComplete
1963529 April 19632 September 19631 daysComplete
196232 July 196210 September 19621 daysComplete
1961104 March 196119 October 19612 daysComplete
1960712 January 196019 August 19601 daysComplete
1959826 March 19594 November 19592 daysComplete
Decade averages for Days with 25 mm (0.98 in) or more of precipitation in Chicago
DecadeAverage days per yearYears counted
1950s8.01
1960s6.210
1970s7.810
1980s8.610
1990s8.610
2000s8.410
2010s8.610
2020s6.26

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 Days with 25 mm (0.98 in) or more of precipitation 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).