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Built 2026-10-19 (19 October 2026)

Frotuna Threshold Days by Year (SWE00139180)

3 fixed thresholds counted per year at Frotuna (SWE00139180): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Frotuna Thresholds

  • Frotuna: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1957 with 26.
  • Frotuna: days with 25 mm (0.98 in) or more of precipitation in 20 years, most in 1978 with 5.
  • Frotuna: days with 50 mm (1.97 in) or more of precipitation in 4 years, most in 1957 with 1.
  • 3 fixed thresholds have at least one qualifying day at Frotuna.
32 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Frotuna Days per year at Frotuna with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 26 in 1957. 01020301945: 181955: 161956: 141957: 261958: 241959: 111960: 261961: 201962: 111963: 121964: 111966: 171967: 171968: 171969: 151970: 101971: 51972: 51973: 131974: 151975: 121976: 81977: 161978: 111979: 181980: 221981: 201982: 111983: 161984: 181985: 191986: 1619451958196219671971197519791983
Days per year at Frotuna with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 26 in 1957.
Days with 10 mm (0.39 in) or more of precipitation per year at Frotuna
YearDaysDecade average
19451818
19551618.2
19561418.2
19572618.2
19582418.2
19591118.2
19602616.2
19612016.2
19621116.2
19631216.2
19641116.2
19661716.2
19671716.2
19681716.2
19691516.2
19701011.3
1971511.3
1972511.3
19731311.3
19741511.3
19751211.3
1976811.3
19771611.3
19781111.3
19791811.3
19802217.4
19812017.4
19821117.4
19831617.4
19841817.4
19851917.4
19861617.4
First to last qualifying date each year at Frotuna For each year, a bar from the first to the last day at Frotuna meeting 10 mm (0.39 in). 1945: 7 January 1945 to 7 November 19451955: 10 January 1955 to 28 December 19551956: 13 January 1956 to 2 December 19561957: 1 January 1957 to 7 December 19571958: 4 January 1958 to 26 December 19581959: 10 January 1959 to 28 December 19591960: 5 January 1960 to 22 December 19601961: 29 March 1961 to 5 December 19611962: 1 January 1962 to 26 October 19621963: 5 January 1963 to 19 December 19631964: 10 February 1964 to 30 December 19641966: 29 January 1966 to 29 December 19661967: 31 January 1967 to 3 December 19671968: 25 January 1968 to 18 December 19681969: 13 January 1969 to 23 November 19691970: 1 January 1970 to 24 November 19701971: 7 April 1971 to 22 October 19711972: 25 May 1972 to 1 November 19721973: 12 February 1973 to 16 December 19731974: 15 January 1974 to 12 December 19741975: 17 January 1975 to 2 December 19751976: 15 July 1976 to 3 December 19761977: 26 January 1977 to 24 December 19771978: 31 May 1978 to 3 September 19781979: 12 January 1979 to 28 December 19791980: 24 April 1980 to 20 November 19801981: 14 January 1981 to 30 November 19811982: 6 February 1982 to 15 December 19821983: 4 January 1983 to 20 December 19831984: 3 January 1984 to 20 December 19841985: 20 January 1985 to 6 December 19851986: 23 March 1986 to 29 December 198619451958196219671971197519791983JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Frotuna meeting 10 mm (0.39 in).
First to last qualifying date each year at Frotuna
YearFirst dateLast date
19451945-01-071945-11-07
19551955-01-101955-12-28
19561956-01-131956-12-02
19571957-01-011957-12-07
19581958-01-041958-12-26
19591959-01-101959-12-28
19601960-01-051960-12-22
19611961-03-291961-12-05
19621962-01-011962-10-26
19631963-01-051963-12-19
19641964-02-101964-12-30
19661966-01-291966-12-29
19671967-01-311967-12-03
19681968-01-251968-12-18
19691969-01-131969-11-23
19701970-01-011970-11-24
19711971-04-071971-10-22
19721972-05-251972-11-01
19731973-02-121973-12-16
19741974-01-151974-12-12
19751975-01-171975-12-02
19761976-07-151976-12-03
19771977-01-261977-12-24
19781978-05-311978-09-03
19791979-01-121979-12-28
19801980-04-241980-11-20
19811981-01-141981-11-30
19821982-02-061982-12-15
19831983-01-041983-12-20
19841984-01-031984-12-20
19851985-01-201985-12-06
19861986-03-231986-12-29

Every Fixed Threshold

Fixed thresholds at Frotuna
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3226195716
25 mm (0.98 in): Days with 25 mm or more rain20519784
50 mm (1.97 in): Days with 50 mm or more rain4119571

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1945.

Download the Data

  • Data for Frotuna 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).