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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Iol Threshold Days by Year (TI000038946)

3 fixed thresholds counted per year at Iol (TI000038946): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iol Thresholds

  • Iol: days with 10 mm (0.39 in) or more of precipitation in 38 years, most in 1969 with 34.
  • Iol: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1969 with 9.
  • Iol: days with 50 mm (1.97 in) or more of precipitation in 5 years, most in 1954 with 1.
  • 3 fixed thresholds have at least one qualifying day at Iol.
38 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Iol Days per year at Iol with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 34 in 1969. 0102030401936: 71947: 91950: 91951: 171952: 191953: 231954: 191955: 121956: 161957: 181958: 211959: 111960: 171961: 111962: 241963: 191964: 161965: 201967: 141968: 241969: 341970: 151971: 91972: 251973: 201974: 161975: 191976: 181977: 221978: 151979: 111980: 141981: 161983: 111984: 201985: 211986: 151987: 191936195219561960196419691973197719811986
Days per year at Iol with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 34 in 1969.
Days with 10 mm (0.39 in) or more of precipitation per year at Iol
YearDaysDecade average
193677
194799
1950916.5
19511716.5
19521916.5
19532316.5
19541916.5
19551216.5
19561616.5
19571816.5
19582116.5
19591116.5
19601719.9
19611119.9
19622419.9
19631919.9
19641619.9
19652019.9
19671419.9
19682419.9
19693419.9
19701517
1971917
19722517
19732017
19741617
19751917
19761817
19772217
19781517
19791117
19801416.6
19811616.6
19831116.6
19842016.6
19852116.6
19861516.6
19871916.6
First to last qualifying date each year at Iol For each year, a bar from the first to the last day at Iol meeting 10 mm (0.39 in). 1936: 24 March 1936 to 13 December 19361947: 2 January 1947 to 6 December 19471950: 13 January 1950 to 12 December 19501951: 1 January 1951 to 26 December 19511952: 5 February 1952 to 9 May 19521953: 26 February 1953 to 18 December 19531954: 5 January 1954 to 8 December 19541955: 23 January 1955 to 2 June 19551956: 16 January 1956 to 12 December 19561957: 13 January 1957 to 18 December 19571958: 1 February 1958 to 13 December 19581959: 2 February 1959 to 1 November 19591960: 28 January 1960 to 26 November 19601961: 10 January 1961 to 23 December 19611962: 5 February 1962 to 26 December 19621963: 3 February 1963 to 6 December 19631964: 6 January 1964 to 16 July 19641965: 17 January 1965 to 5 November 19651967: 23 February 1967 to 1 December 19671968: 12 January 1968 to 19 December 19681969: 21 January 1969 to 11 November 19691970: 14 January 1970 to 4 December 19701971: 1 March 1971 to 6 November 19711972: 23 January 1972 to 19 December 19721973: 17 January 1973 to 27 May 19731974: 26 January 1974 to 24 December 19741975: 5 January 1975 to 11 December 19751976: 1 January 1976 to 31 October 19761977: 4 January 1977 to 8 November 19771978: 22 January 1978 to 9 December 19781979: 10 February 1979 to 25 May 19791980: 24 January 1980 to 26 November 19801981: 26 January 1981 to 27 December 19811983: 23 February 1983 to 5 November 19831984: 15 February 1984 to 2 December 19841985: 3 January 1985 to 22 December 19851986: 17 February 1986 to 29 December 19861987: 1 January 1987 to 28 October 198719361953195819631969197419791985JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Iol meeting 10 mm (0.39 in).
First to last qualifying date each year at Iol
YearFirst dateLast date
19361936-03-241936-12-13
19471947-01-021947-12-06
19501950-01-131950-12-12
19511951-01-011951-12-26
19521952-02-051952-05-09
19531953-02-261953-12-18
19541954-01-051954-12-08
19551955-01-231955-06-02
19561956-01-161956-12-12
19571957-01-131957-12-18
19581958-02-011958-12-13
19591959-02-021959-11-01
19601960-01-281960-11-26
19611961-01-101961-12-23
19621962-02-051962-12-26
19631963-02-031963-12-06
19641964-01-061964-07-16
19651965-01-171965-11-05
19671967-02-231967-12-01
19681968-01-121968-12-19
19691969-01-211969-11-11
19701970-01-141970-12-04
19711971-03-011971-11-06
19721972-01-231972-12-19
19731973-01-171973-05-27
19741974-01-261974-12-24
19751975-01-051975-12-11
19761976-01-011976-10-31
19771977-01-041977-11-08
19781978-01-221978-12-09
19791979-02-101979-05-25
19801980-01-241980-11-26
19811981-01-261981-12-27
19831983-02-231983-11-05
19841984-02-151984-12-02
19851985-01-031985-12-22
19861986-02-171986-12-29
19871987-01-011987-10-28

Every Fixed Threshold

Fixed thresholds at Iol
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3834196919
25 mm (0.98 in): Days with 25 mm or more rain35919695
50 mm (1.97 in): Days with 50 mm or more rain5119541

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.

Download the Data

  • Data for Iol 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).