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Built 2026-10-19 (19 October 2026)

Iowa City Muni AP Threshold Days by Year (USW00014937)

18 fixed thresholds counted per year at Iowa City Muni AP (USW00014937): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iowa City Muni AP Thresholds

  • Iowa City Muni AP: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 2005 with 86.
  • Iowa City Muni AP: days with a maximum temperature at or above 90 F (32.2 C) in 36 years, most in 2005 with 52.
  • Iowa City Muni AP: days with a maximum temperature at or below 0 C (32 F) in 36 years, most in 2010 with 69.
  • Iowa City Muni AP: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 1952 with 178.
  • 18 fixed thresholds have at least one qualifying day at Iowa City Muni AP.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Iowa City Muni AP Days per year at Iowa City Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 86 in 2005. 02550751001948: 621949: 641950: 301951: 321952: 661996: 321997: 361998: 341999: 472000: 282001: 432002: 472003: 512004: 252005: 862006: 502007: 552008: 232009: 102010: 452011: 472012: 722013: 462014: 222015: 282016: 442017: 522018: 602019: 562020: 512021: 662022: 602023: 642024: 482025: 542026: 54194819521999200320072011201520192023
Days per year at Iowa City Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 86 in 2005.
Days at or above 30 C (86 F) per year at Iowa City Muni AP
YearDaysDecade average
19486263
19496463
19503042.7
19513242.7
19526642.7
19963237.3
19973637.3
19983437.3
19994737.3
20002841.8
20014341.8
20024741.8
20035141.8
20042541.8
20058641.8
20065041.8
20075541.8
20082341.8
20091041.8
20104547.2
20114747.2
20127247.2
20134647.2
20142247.2
20152847.2
20164447.2
20175247.2
20186047.2
20195647.2
20205156.7
20216656.7
20226056.7
20236456.7
20244856.7
20255456.7
20265456.7
First to last qualifying date each year at Iowa City Muni AP For each year, a bar from the first to the last day at Iowa City Muni AP meeting 30 C (86 F). 1948: 18 April 1948 to 19 September 19481949: 25 April 1949 to 8 October 19491950: 23 May 1950 to 31 October 19501951: 1 May 1951 to 1 October 19511952: 29 April 1952 to 30 September 19521996: 17 May 1996 to 6 September 19961997: 18 May 1997 to 7 October 19971998: 14 May 1998 to 26 September 19981999: 28 May 1999 to 15 October 19992000: 1 June 2000 to 18 September 20002001: 15 May 2001 to 7 September 20012002: 15 April 2002 to 30 September 20022003: 1 April 2003 to 18 September 20032004: 16 April 2004 to 14 September 20042005: 19 May 2005 to 5 October 20052006: 13 April 2006 to 3 October 20062007: 29 April 2007 to 7 October 20072008: 5 June 2008 to 2 September 20082009: 18 June 2009 to 8 August 20092010: 23 May 2010 to 9 October 20102011: 10 May 2011 to 12 September 20112012: 15 May 2012 to 12 September 20122013: 30 April 2013 to 19 September 20132014: 7 May 2014 to 4 September 20142015: 9 June 2015 to 16 September 20152016: 26 May 2016 to 17 October 20162017: 15 May 2017 to 2 October 20172018: 24 May 2018 to 3 October 20182019: 16 May 2019 to 1 October 20192020: 25 May 2020 to 6 September 20202021: 27 April 2021 to 30 September 20212022: 9 May 2022 to 20 September 20222023: 7 May 2023 to 3 October 20232024: 14 April 2024 to 11 October 20242025: 14 May 2025 to 4 October 20252026: 21 March 2026 to 12 October 202619481996200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Iowa City Muni AP meeting 30 C (86 F).
First to last qualifying date each year at Iowa City Muni AP
YearFirst dateLast date
19481948-04-181948-09-19
19491949-04-251949-10-08
19501950-05-231950-10-31
19511951-05-011951-10-01
19521952-04-291952-09-30
19961996-05-171996-09-06
19971997-05-181997-10-07
19981998-05-141998-09-26
19991999-05-281999-10-15
20002000-06-012000-09-18
20012001-05-152001-09-07
20022002-04-152002-09-30
20032003-04-012003-09-18
20042004-04-162004-09-14
20052005-05-192005-10-05
20062006-04-132006-10-03
20072007-04-292007-10-07
20082008-06-052008-09-02
20092009-06-182009-08-08
20102010-05-232010-10-09
20112011-05-102011-09-12
20122012-05-152012-09-12
20132013-04-302013-09-19
20142014-05-072014-09-04
20152015-06-092015-09-16
20162016-05-262016-10-17
20172017-05-152017-10-02
20182018-05-242018-10-03
20192019-05-162019-10-01
20202020-05-252020-09-06
20212021-04-272021-09-30
20222022-05-092022-09-20
20232023-05-072023-10-03
20242024-04-142024-10-11
20252025-05-142025-10-04
20262026-03-212026-10-12

Every Fixed Threshold

Fixed thresholds at Iowa City Muni AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3686200554
35 C (95 F): Days282020125
40 C (104 F): Days1420124
90 F (32.2 C): Days3652200525
100 F (37.8 C): Days7520122
0 C (32 F): Ice days (max3669201028
0 C (32 F): Frost days (min36178195273
-10 C (14 F): Days with min3675195025
-20 C (-4 F): Days with min342119514
-30 C (-22 F): Days with min4519962
20 C (68 F): Tropical nights (min3649201048
25 C (77 F): Days with min11420113
10 mm (0.39 in): Days with 10 mm or more rain3642195136
25 mm (0.98 in): Days with 25 mm or more rain3615200918
50 mm (1.97 in): Days with 50 mm or more rain27420182
100 mm (3.94 in): Days with 100 mm or more rain3119961
10 cm (3.9 in): Days with 10 cm or more snowfall5419513
25 cm (9.8 in): Days with 25 cm or more snowfall1219512

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

  • Data for Iowa City Muni 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 (2026-10-17).