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Built 2026-10-19 (19 October 2026)

Marshalltown Muni AP Threshold Days by Year (USW00094988)

15 fixed thresholds counted per year at Marshalltown Muni AP (USW00094988): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Marshalltown Muni AP Thresholds

  • Marshalltown Muni AP: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 2012 with 64.
  • Marshalltown Muni AP: days with a maximum temperature at or above 90 F (32.2 C) in 29 years, most in 2012 with 40.
  • Marshalltown Muni AP: days with a maximum temperature at or below 0 C (32 F) in 29 years, most in 2010 with 80.
  • Marshalltown Muni AP: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 1997 with 168.
  • 15 fixed thresholds have at least one qualifying day at Marshalltown Muni AP.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Marshalltown Muni AP Days per year at Marshalltown Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2012. 0204060801997: 341998: 331999: 322000: 252001: 412002: 442003: 322004: 142005: 432006: 352007: 422008: 182009: 132010: 342011: 402012: 642013: 442014: 172015: 202016: 412017: 432018: 442019: 272020: 362021: 552022: 422023: 492024: 432025: 321997200020032006200920122015201820212024
Days per year at Marshalltown Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2012.
Days at or above 30 C (86 F) per year at Marshalltown Muni AP
YearDaysDecade average
19973433
19983333
19993233
20002530.7
20014130.7
20024430.7
20033230.7
20041430.7
20054330.7
20063530.7
20074230.7
20081830.7
20091330.7
20103437.4
20114037.4
20126437.4
20134437.4
20141737.4
20152037.4
20164137.4
20174337.4
20184437.4
20192737.4
20203642.8
20215542.8
20224242.8
20234942.8
20244342.8
20253242.8
First to last qualifying date each year at Marshalltown Muni AP For each year, a bar from the first to the last day at Marshalltown Muni AP meeting 30 C (86 F). 1997: 18 May 1997 to 6 October 19971998: 14 May 1998 to 26 September 19981999: 5 June 1999 to 7 September 19992000: 11 May 2000 to 18 September 20002001: 14 May 2001 to 3 September 20012002: 15 April 2002 to 30 September 20022003: 1 April 2003 to 11 September 20032004: 16 April 2004 to 14 September 20042005: 6 June 2005 to 4 October 20052006: 13 April 2006 to 3 October 20062007: 29 April 2007 to 21 September 20072008: 25 May 2008 to 2 September 20082009: 24 April 2009 to 14 August 20092010: 23 May 2010 to 9 October 20102011: 10 April 2011 to 12 September 20112012: 15 May 2012 to 11 September 20122013: 14 May 2013 to 19 September 20132014: 7 May 2014 to 4 September 20142015: 9 June 2015 to 16 September 20152016: 6 May 2016 to 21 September 20162017: 15 May 2017 to 25 September 20172018: 24 May 2018 to 3 October 20182019: 16 May 2019 to 30 September 20192020: 2 June 2020 to 6 September 20202021: 1 May 2021 to 30 September 20212022: 9 May 2022 to 20 September 20222023: 24 May 2023 to 3 October 20232024: 18 May 2024 to 5 October 20242025: 2 June 2025 to 4 October 202519972001200520092013201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Marshalltown Muni AP meeting 30 C (86 F).
First to last qualifying date each year at Marshalltown Muni AP
YearFirst dateLast date
19971997-05-181997-10-06
19981998-05-141998-09-26
19991999-06-051999-09-07
20002000-05-112000-09-18
20012001-05-142001-09-03
20022002-04-152002-09-30
20032003-04-012003-09-11
20042004-04-162004-09-14
20052005-06-062005-10-04
20062006-04-132006-10-03
20072007-04-292007-09-21
20082008-05-252008-09-02
20092009-04-242009-08-14
20102010-05-232010-10-09
20112011-04-102011-09-12
20122012-05-152012-09-11
20132013-05-142013-09-19
20142014-05-072014-09-04
20152015-06-092015-09-16
20162016-05-062016-09-21
20172017-05-152017-09-25
20182018-05-242018-10-03
20192019-05-162019-09-30
20202020-06-022020-09-06
20212021-05-012021-09-30
20222022-05-092022-09-20
20232023-05-242023-10-03
20242024-05-182024-10-05
20252025-06-022025-10-04

Every Fixed Threshold

Fixed thresholds at Marshalltown Muni AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2964201232
35 C (95 F): Days171320121
90 F (32.2 C): Days2940201212
100 F (37.8 C): Days4320121
0 C (32 F): Ice days (max2980201056
0 C (32 F): Frost days (min291681997141
-10 C (14 F): Days with min2972201461
-20 C (-4 F): Days with min2925201415
-30 C (-22 F): Days with min5220091
20 C (68 F): Tropical nights (min2931201126
25 C (77 F): Days with min7320111
10 mm (0.39 in): Days with 10 mm or more rain2739201525
25 mm (0.98 in): Days with 25 mm or more rain2713201511
50 mm (1.97 in): Days with 50 mm or more rain18520133
100 mm (3.94 in): Days with 100 mm or more rain4120031

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 Marshalltown 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 (2025-12-31).