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

Viskan Threshold Days by Year (SWE00139816)

3 fixed thresholds counted per year at Viskan (SWE00139816): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Viskan Thresholds

  • Viskan: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1966 with 20.
  • Viskan: days with 25 mm (0.98 in) or more of precipitation in 18 years, most in 1974 with 4.
  • Viskan: days with 50 mm (1.97 in) or more of precipitation in 1 years, most in 1983 with 2.
  • 3 fixed thresholds have at least one qualifying day at Viskan.
30 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Viskan Days per year at Viskan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 20 in 1966. 051015201955: 91956: 121957: 121958: 61959: 31960: 151961: 171962: 71963: 101964: 71965: 101966: 201967: 71968: 121969: 111970: 151971: 81972: 111973: 101974: 181975: 61976: 81977: 101978: 151979: 81980: 131981: 161982: 121983: 151984: 131955195819611964196719701973197619791982
Days per year at Viskan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 20 in 1966.
Days with 10 mm (0.39 in) or more of precipitation per year at Viskan
YearDaysDecade average
195598.4
1956128.4
1957128.4
195868.4
195938.4
19601511.6
19611711.6
1962711.6
19631011.6
1964711.6
19651011.6
19662011.6
1967711.6
19681211.6
19691111.6
19701510.9
1971810.9
19721110.9
19731010.9
19741810.9
1975610.9
1976810.9
19771010.9
19781510.9
1979810.9
19801313.8
19811613.8
19821213.8
19831513.8
19841313.8
First to last qualifying date each year at Viskan For each year, a bar from the first to the last day at Viskan meeting 10 mm (0.39 in). 1955: 14 May 1955 to 5 December 19551956: 12 June 1956 to 27 August 19561957: 3 March 1957 to 28 December 19571958: 18 June 1958 to 12 November 19581959: 10 January 1959 to 7 August 19591960: 30 May 1960 to 12 December 19601961: 18 February 1961 to 30 December 19611962: 16 February 1962 to 12 December 19621963: 22 June 1963 to 18 December 19631964: 23 June 1964 to 10 October 19641965: 27 April 1965 to 26 November 19651966: 29 January 1966 to 23 December 19661967: 12 May 1967 to 28 October 19671968: 25 January 1968 to 29 October 19681969: 13 April 1969 to 1 November 19691970: 6 March 1970 to 30 October 19701971: 31 January 1971 to 29 November 19711972: 20 May 1972 to 1 November 19721973: 23 January 1973 to 10 August 19731974: 11 February 1974 to 17 December 19741975: 16 May 1975 to 28 September 19751976: 5 January 1976 to 4 December 19761977: 1 January 1977 to 8 November 19771978: 30 January 1978 to 24 September 19781979: 24 June 1979 to 19 November 19791980: 18 April 1980 to 17 October 19801981: 15 January 1981 to 27 December 19811982: 6 February 1982 to 23 December 19821983: 3 April 1983 to 30 October 19831984: 29 March 1984 to 27 November 198419551959196319671971197519791983JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Viskan meeting 10 mm (0.39 in).
First to last qualifying date each year at Viskan
YearFirst dateLast date
19551955-05-141955-12-05
19561956-06-121956-08-27
19571957-03-031957-12-28
19581958-06-181958-11-12
19591959-01-101959-08-07
19601960-05-301960-12-12
19611961-02-181961-12-30
19621962-02-161962-12-12
19631963-06-221963-12-18
19641964-06-231964-10-10
19651965-04-271965-11-26
19661966-01-291966-12-23
19671967-05-121967-10-28
19681968-01-251968-10-29
19691969-04-131969-11-01
19701970-03-061970-10-30
19711971-01-311971-11-29
19721972-05-201972-11-01
19731973-01-231973-08-10
19741974-02-111974-12-17
19751975-05-161975-09-28
19761976-01-051976-12-04
19771977-01-011977-11-08
19781978-01-301978-09-24
19791979-06-241979-11-19
19801980-04-181980-10-17
19811981-01-151981-12-27
19821982-02-061982-12-23
19831983-04-031983-10-30
19841984-03-291984-11-27

Every Fixed Threshold

Fixed thresholds at Viskan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3020196613
25 mm (0.98 in): Days with 25 mm or more rain18419741
50 mm (1.97 in): Days with 50 mm or more rain1219832

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 Viskan 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).