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Built 2026-10-19 (19 October 2026)

Mason City 4SE Threshold Days by Year (USC00115413)

16 fixed thresholds counted per year at Mason City 4SE (USC00115413): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mason City 4SE Thresholds

  • Mason City 4SE: days with 10 mm (0.39 in) or more of precipitation in 40 years, most in 1990 with 44.
  • Mason City 4SE: days with 25 mm (0.98 in) or more of precipitation in 40 years, most in 2009 with 18.
  • Mason City 4SE: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 1987 with 94.
  • Mason City 4SE: days with a maximum temperature at or above 90 F (32.2 C) in 36 years, most in 1988 with 62.
  • 16 fixed thresholds have at least one qualifying day at Mason City 4SE.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Mason City 4SE Days per year at Mason City 4SE with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 94 in 1987. 02550751001963: 641967: 421970: 531971: 761972: 621973: 441974: 401975: 531976: 491977: 541978: 601979: 521980: 701981: 261982: 371983: 821984: 601985: 391986: 481987: 941988: 881989: 451990: 591991: 701992: 291993: 501994: 541995: 651996: 521997: 581998: 631999: 612000: 602008: 282009: 212010: 53196319721976198019841988199219962000
Days per year at Mason City 4SE with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 94 in 1987.
Days at or above 30 C (86 F) per year at Mason City 4SE
YearDaysDecade average
19636453
19674253
19705354.3
19717654.3
19726254.3
19734454.3
19744054.3
19755354.3
19764954.3
19775454.3
19786054.3
19795254.3
19807058.9
19812658.9
19823758.9
19838258.9
19846058.9
19853958.9
19864858.9
19879458.9
19888858.9
19894558.9
19905956.1
19917056.1
19922956.1
19935056.1
19945456.1
19956556.1
19965256.1
19975856.1
19986356.1
19996156.1
20006036.3
20082836.3
20092136.3
20105353
First to last qualifying date each year at Mason City 4SE For each year, a bar from the first to the last day at Mason City 4SE meeting 30 C (86 F). 1963: 8 May 1963 to 15 October 19631967: 24 May 1967 to 4 October 19671970: 28 April 1970 to 21 September 19701971: 12 April 1971 to 2 October 19711972: 19 May 1972 to 21 September 19721973: 8 June 1973 to 26 September 19731974: 20 May 1974 to 27 August 19741975: 19 May 1975 to 10 September 19751976: 5 June 1976 to 3 October 19761977: 16 April 1977 to 4 September 19771978: 25 May 1978 to 20 September 19781979: 8 May 1979 to 21 October 19791980: 22 April 1980 to 22 September 19801981: 29 May 1981 to 30 September 19811982: 5 May 1982 to 5 October 19821983: 10 June 1983 to 2 October 19831984: 18 May 1984 to 24 September 19841985: 28 March 1985 to 20 September 19851986: 29 March 1986 to 21 September 19861987: 20 April 1987 to 28 September 19871988: 12 May 1988 to 22 September 19881989: 25 April 1989 to 14 October 19891990: 24 April 1990 to 27 September 19901991: 13 May 1991 to 15 September 19911992: 1 May 1992 to 16 September 19921993: 8 May 1993 to 12 September 19931994: 26 April 1994 to 1 October 19941995: 5 June 1995 to 30 September 19951996: 16 May 1996 to 10 September 19961997: 17 May 1997 to 8 October 19971998: 14 May 1998 to 27 September 19981999: 29 May 1999 to 26 September 19992000: 8 May 2000 to 1 October 20002008: 3 June 2008 to 24 September 20082009: 26 April 2009 to 29 August 20092010: 24 May 2010 to 12 October 201019631973197819831988199319982010JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mason City 4SE meeting 30 C (86 F).
First to last qualifying date each year at Mason City 4SE
YearFirst dateLast date
19631963-05-081963-10-15
19671967-05-241967-10-04
19701970-04-281970-09-21
19711971-04-121971-10-02
19721972-05-191972-09-21
19731973-06-081973-09-26
19741974-05-201974-08-27
19751975-05-191975-09-10
19761976-06-051976-10-03
19771977-04-161977-09-04
19781978-05-251978-09-20
19791979-05-081979-10-21
19801980-04-221980-09-22
19811981-05-291981-09-30
19821982-05-051982-10-05
19831983-06-101983-10-02
19841984-05-181984-09-24
19851985-03-281985-09-20
19861986-03-291986-09-21
19871987-04-201987-09-28
19881988-05-121988-09-22
19891989-04-251989-10-14
19901990-04-241990-09-27
19911991-05-131991-09-15
19921992-05-011992-09-16
19931993-05-081993-09-12
19941994-04-261994-10-01
19951995-06-051995-09-30
19961996-05-161996-09-10
19971997-05-171997-10-08
19981998-05-141998-09-27
19991999-05-291999-09-26
20002000-05-082000-10-01
20082008-06-032008-09-24
20092009-04-262009-08-29
20102010-05-242010-10-12

Every Fixed Threshold

Fixed thresholds at Mason City 4SE
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3694198753
35 C (95 F): Days292519834
90 F (32.2 C): Days3662198826
100 F (37.8 C): Days4819881
0 C (32 F): Ice days (max3664201064
0 C (32 F): Frost days (min361371996115
-10 C (14 F): Days with min3656196347
-20 C (-4 F): Days with min342119639
-30 C (-22 F): Days with min3119771
20 C (68 F): Tropical nights (min3651198335
25 C (77 F): Days with min11219801
10 mm (0.39 in): Days with 10 mm or more rain4044199035
25 mm (0.98 in): Days with 25 mm or more rain4018200913
50 mm (1.97 in): Days with 50 mm or more rain29519902
100 mm (3.94 in): Days with 100 mm or more rain2119911
10 cm (3.9 in): Days with 10 cm or more snowfall23319811

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.

Download the Data

  • Data for Mason City 4SE 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).