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Built 2026-10-19 (19 October 2026)

Chicago Palwaukee AP Threshold Days by Year (USW00004838)

15 fixed thresholds counted per year at Chicago Palwaukee AP (USW00004838): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chicago Palwaukee AP Thresholds

  • Chicago Palwaukee AP: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 2012 with 62.
  • Chicago Palwaukee AP: days with a maximum temperature at or above 90 F (32.2 C) in 29 years, most in 2012 with 40.
  • Chicago Palwaukee AP: days with a maximum temperature at or below 0 C (32 F) in 29 years, most in 2014 with 71.
  • Chicago Palwaukee AP: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 2013 with 142.
  • 15 fixed thresholds have at least one qualifying day at Chicago Palwaukee AP.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Chicago Palwaukee AP Days per year at Chicago Palwaukee AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 62 in 2012. 0204060801997: 271998: 401999: 422000: 162001: 352002: 482003: 222004: 232005: 532006: 232007: 432008: 222009: 162010: 532011: 472012: 622013: 362014: 312015: 292016: 442017: 292018: 552019: 392020: 562021: 592022: 472023: 322024: 402025: 481997200020032006200920122015201820212024
Days per year at Chicago Palwaukee AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 62 in 2012.
Days at or above 30 C (86 F) per year at Chicago Palwaukee AP
YearDaysDecade average
19972736.3
19984036.3
19994236.3
20001630.1
20013530.1
20024830.1
20032230.1
20042330.1
20055330.1
20062330.1
20074330.1
20082230.1
20091630.1
20105342.5
20114742.5
20126242.5
20133642.5
20143142.5
20152942.5
20164442.5
20172942.5
20185542.5
20193942.5
20205647
20215947
20224747
20233247
20244047
20254847
First to last qualifying date each year at Chicago Palwaukee AP For each year, a bar from the first to the last day at Chicago Palwaukee AP meeting 30 C (86 F). 1997: 20 June 1997 to 5 October 19971998: 15 May 1998 to 26 September 19981999: 28 May 1999 to 26 September 19992000: 1 June 2000 to 19 September 20002001: 3 May 2001 to 7 September 20012002: 15 April 2002 to 30 September 20022003: 15 April 2003 to 7 September 20032004: 18 April 2004 to 23 September 20042005: 4 June 2005 to 4 October 20052006: 28 May 2006 to 23 August 20062007: 14 May 2007 to 8 October 20072008: 5 June 2008 to 2 September 20082009: 19 June 2009 to 16 August 20092010: 23 May 2010 to 23 September 20102011: 11 May 2011 to 12 September 20112012: 20 March 2012 to 12 September 20122013: 14 May 2013 to 11 September 20132014: 8 May 2014 to 5 September 20142015: 9 June 2015 to 17 September 20152016: 24 May 2016 to 25 September 20162017: 16 May 2017 to 26 September 20172018: 1 May 2018 to 9 October 20182019: 5 June 2019 to 1 October 20192020: 24 May 2020 to 3 September 20202021: 27 April 2021 to 1 October 20212022: 10 May 2022 to 3 September 20222023: 7 May 2023 to 5 September 20232024: 21 May 2024 to 21 September 20242025: 15 May 2025 to 4 October 202519972001200520092013201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Chicago Palwaukee AP meeting 30 C (86 F).
First to last qualifying date each year at Chicago Palwaukee AP
YearFirst dateLast date
19971997-06-201997-10-05
19981998-05-151998-09-26
19991999-05-281999-09-26
20002000-06-012000-09-19
20012001-05-032001-09-07
20022002-04-152002-09-30
20032003-04-152003-09-07
20042004-04-182004-09-23
20052005-06-042005-10-04
20062006-05-282006-08-23
20072007-05-142007-10-08
20082008-06-052008-09-02
20092009-06-192009-08-16
20102010-05-232010-09-23
20112011-05-112011-09-12
20122012-03-202012-09-12
20132013-05-142013-09-11
20142014-05-082014-09-05
20152015-06-092015-09-17
20162016-05-242016-09-25
20172017-05-162017-09-26
20182018-05-012018-10-09
20192019-06-052019-10-01
20202020-05-242020-09-03
20212021-04-272021-10-01
20222022-05-102022-09-03
20232023-05-072023-09-05
20242024-05-212024-09-21
20252025-05-152025-10-04

Every Fixed Threshold

Fixed thresholds at Chicago Palwaukee AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2962201248
35 C (95 F): Days221220127
40 C (104 F): Days1120121
90 F (32.2 C): Days2940201228
100 F (37.8 C): Days5320121
0 C (32 F): Ice days (max2971201448
0 C (32 F): Frost days (min291422013116
-10 C (14 F): Days with min2951201432
-20 C (-4 F): Days with min19820142
20 C (68 F): Tropical nights (min2946200535
25 C (77 F): Days with min19920125
10 mm (0.39 in): Days with 10 mm or more rain2740201821
25 mm (0.98 in): Days with 25 mm or more rain271520183
50 mm (1.97 in): Days with 50 mm or more rain18320081
100 mm (3.94 in): Days with 100 mm or more rain2120081

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1997.

Download the Data

  • Data for Chicago Palwaukee AP threshold days 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.

Data as of . Last revised (2025-12-31).