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

Istisu Threshold Days by Year (AJ000037883)

3 fixed thresholds counted per year at Istisu (AJ000037883): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Istisu Thresholds

  • Istisu: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1958 with 19.
  • Istisu: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1955 with 4.
  • Istisu: days with 50 mm (1.97 in) or more of precipitation in 3 years, most in 1955 with 1.
  • 3 fixed thresholds have at least one qualifying day at Istisu.
32 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Istisu Days per year at Istisu with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 19 in 1958. 051015201955: 141956: 171957: 121958: 191959: 171960: 111961: 61962: 151963: 181964: 121965: 131967: 121968: 171969: 131970: 121971: 121972: 181973: 111974: 191975: 161976: 101977: 71978: 91979: 71980: 51981: 81982: 161983: 71984: 71985: 71986: 121987: 1719551959196319681972197619801984
Days per year at Istisu with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 19 in 1958.
Days with 10 mm (0.39 in) or more of precipitation per year at Istisu
YearDaysDecade average
19551415.8
19561715.8
19571215.8
19581915.8
19591715.8
19601113
1961613
19621513
19631813
19641213
19651313
19671213
19681713
19691313
19701212.1
19711212.1
19721812.1
19731112.1
19741912.1
19751612.1
19761012.1
1977712.1
1978912.1
1979712.1
198059.9
198189.9
1982169.9
198379.9
198479.9
198579.9
1986129.9
1987179.9
First to last qualifying date each year at Istisu For each year, a bar from the first to the last day at Istisu meeting 10 mm (0.39 in). 1955: 7 April 1955 to 1 December 19551956: 22 February 1956 to 11 September 19561957: 26 March 1957 to 20 December 19571958: 6 January 1958 to 9 December 19581959: 25 February 1959 to 28 November 19591960: 22 February 1960 to 20 September 19601961: 27 February 1961 to 23 December 19611962: 5 January 1962 to 10 October 19621963: 24 February 1963 to 2 November 19631964: 7 March 1964 to 3 October 19641965: 2 March 1965 to 22 October 19651967: 24 February 1967 to 8 November 19671968: 3 February 1968 to 12 December 19681969: 8 March 1969 to 9 November 19691970: 10 March 1970 to 14 October 19701971: 11 May 1971 to 9 December 19711972: 17 January 1972 to 17 December 19721973: 22 February 1973 to 23 November 19731974: 31 March 1974 to 26 November 19741975: 21 February 1975 to 13 November 19751976: 1 February 1976 to 10 December 19761977: 3 March 1977 to 18 October 19771978: 9 April 1978 to 19 October 19781979: 5 April 1979 to 14 October 19791980: 22 April 1980 to 24 July 19801981: 9 February 1981 to 21 November 19811982: 14 January 1982 to 9 November 19821983: 4 May 1983 to 25 August 19831984: 28 January 1984 to 19 October 19841985: 18 February 1985 to 3 December 19851986: 1 March 1986 to 22 December 19861987: 8 February 1987 to 19 December 198719551959196319681972197619801984JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Istisu meeting 10 mm (0.39 in).
First to last qualifying date each year at Istisu
YearFirst dateLast date
19551955-04-071955-12-01
19561956-02-221956-09-11
19571957-03-261957-12-20
19581958-01-061958-12-09
19591959-02-251959-11-28
19601960-02-221960-09-20
19611961-02-271961-12-23
19621962-01-051962-10-10
19631963-02-241963-11-02
19641964-03-071964-10-03
19651965-03-021965-10-22
19671967-02-241967-11-08
19681968-02-031968-12-12
19691969-03-081969-11-09
19701970-03-101970-10-14
19711971-05-111971-12-09
19721972-01-171972-12-17
19731973-02-221973-11-23
19741974-03-311974-11-26
19751975-02-211975-11-13
19761976-02-011976-12-10
19771977-03-031977-10-18
19781978-04-091978-10-19
19791979-04-051979-10-14
19801980-04-221980-07-24
19811981-02-091981-11-21
19821982-01-141982-11-09
19831983-05-041983-08-25
19841984-01-281984-10-19
19851985-02-181985-12-03
19861986-03-011986-12-22
19871987-02-081987-12-19

Every Fixed Threshold

Fixed thresholds at Istisu
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3219195817
25 mm (0.98 in): Days with 25 mm or more rain21419551
50 mm (1.97 in): Days with 50 mm or more rain3119551

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

  • Data for Istisu 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).