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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Iowa Hill Threshold Days by Year

17 fixed thresholds counted per year at Iowa Hill (USC00044288): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iowa Hill Thresholds

  • Iowa Hill: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1983 with 63.
  • Iowa Hill: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 1995 with 33.
  • Iowa Hill: days with 50 mm (1.97 in) or more of precipitation in 65 years, most in 1940 with 14.
  • Iowa Hill: days with 10 cm (3.9 in) or more of snowfall in 35 years, most in 1952 with 14.
  • 17 fixed thresholds have at least one qualifying day at Iowa Hill.
9 years with a qualifying day
Days at or above 30 C (86 F) per year at Iowa Hill Days per year at Iowa Hill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 1906. 0204060801905: 501906: 771907: 311908: 631909: 611940: 631941: 381943: 511944: 61190519061907190819091940194119431944
Days per year at Iowa Hill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 1906.
Days at or above 30 C (86 F) per year at Iowa Hill
YearDaysDecade average
19055056.4
19067756.4
19073156.4
19086356.4
19096156.4
19406353.3
19413853.3
19435153.3
19446153.3
First to last qualifying date each year at Iowa Hill For each year, a bar from the first to the last day at Iowa Hill meeting 30 C (86 F). 1905: 10 June 1905 to 22 September 19051906: 18 June 1906 to 27 October 19061907: 19 June 1907 to 4 October 19071908: 24 June 1908 to 7 October 19081909: 31 May 1909 to 15 October 19091940: 17 May 1940 to 30 August 19401941: 22 May 1941 to 6 September 19411943: 22 May 1943 to 23 September 19431944: 26 May 1944 to 27 September 194419051907190919411944JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Iowa Hill meeting 30 C (86 F).
First to last qualifying date each year at Iowa Hill
YearFirst dateLast date
19051905-06-101905-09-22
19061906-06-181906-10-27
19071907-06-191907-10-04
19081908-06-241908-10-07
19091909-05-311909-10-15
19401940-05-171940-08-30
19411941-05-221941-09-06
19431943-05-221943-09-23
19441944-05-261944-09-27

Every Fixed Threshold

Fixed thresholds at Iowa Hill
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days977190661
35 C (95 F): Days81619088
40 C (104 F): Days1119051
90 F (32.2 C): Days945190827
100 F (37.8 C): Days2519085
0 C (32 F): Ice days (max2219442
0 C (32 F): Frost days (min957194457
20 C (68 F): Tropical nights (min81319085
25 C (77 F): Days with min2519091
10 mm (0.39 in): Days with 10 mm or more rain6563198352
25 mm (0.98 in): Days with 25 mm or more rain6533199531
50 mm (1.97 in): Days with 50 mm or more rain651419408
100 mm (3.94 in): Days with 100 mm or more rain20319951
200 mm (7.87 in): Days with 200 mm or more rain1120051
10 cm (3.9 in): Days with 10 cm or more snowfall351419521
25 cm (9.8 in): Days with 25 cm or more snowfall17519491
50 cm (19.7 in): Days with 50 cm or more snowfall2119551

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

Download the Data

  • Data for Iowa Hill 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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