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Built 2026-10-17 (17 October 2026)

Swansea (the Grange) Threshold Days by Year

4 fixed thresholds counted per year at Swansea (the Grange) (ASN00092041): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Swansea (the Grange) Thresholds

  • Swansea (the Grange): days with 10 mm (0.39 in) or more of precipitation in 40 years, most in 1970 with 30.
  • Swansea (the Grange): days with 25 mm (0.98 in) or more of precipitation in 40 years, most in 1956 with 11.
  • Swansea (the Grange): days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 1969 with 5.
  • Swansea (the Grange): days with 100 mm (3.94 in) or more of precipitation in 4 years, most in 1946 with 2.
  • 4 fixed thresholds have at least one qualifying day at Swansea (the Grange).
40 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Swansea (the Grange) Days per year at Swansea (the Grange) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1970. 01020301932: 201933: 131934: 201935: 241936: 81937: 201938: 201939: 181940: 121941: 151942: 191943: 151944: 181945: 121946: 251947: 181948: 121949: 201950: 211951: 121952: 241953: 191954: 131955: 171956: 261958: 221959: 111960: 231962: 101963: 131964: 171965: 121966: 161967: 151968: 61969: 281970: 301971: 241972: 121973: 161932193619401944194819521956196219661970
Days per year at Swansea (the Grange) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1970.
Days with 10 mm (0.39 in) or more of precipitation per year at Swansea (the Grange)
YearDaysDecade average
19322017.9
19331317.9
19342017.9
19352417.9
1936817.9
19372017.9
19382017.9
19391817.9
19401216.6
19411516.6
19421916.6
19431516.6
19441816.6
19451216.6
19462516.6
19471816.6
19481216.6
19492016.6
19502118.3
19511218.3
19522418.3
19531918.3
19541318.3
19551718.3
19562618.3
19582218.3
19591118.3
19602315.6
19621015.6
19631315.6
19641715.6
19651215.6
19661615.6
19671515.6
1968615.6
19692815.6
19703020.5
19712420.5
19721220.5
19731620.5
First to last qualifying date each year at Swansea (the Grange) For each year, a bar from the first to the last day at Swansea (the Grange) meeting 10 mm (0.39 in). 1932: 15 February 1932 to 24 December 19321933: 26 January 1933 to 21 December 19331934: 9 January 1934 to 31 December 19341935: 6 January 1935 to 21 December 19351936: 22 January 1936 to 21 December 19361937: 2 January 1937 to 26 December 19371938: 15 January 1938 to 22 November 19381939: 17 February 1939 to 25 November 19391940: 22 January 1940 to 8 December 19401941: 16 January 1941 to 8 December 19411942: 20 February 1942 to 24 December 19421943: 4 January 1943 to 5 December 19431944: 3 January 1944 to 21 December 19441945: 16 January 1945 to 26 December 19451946: 20 January 1946 to 15 December 19461947: 4 February 1947 to 22 December 19471948: 5 January 1948 to 1 November 19481949: 1 January 1949 to 7 December 19491950: 13 March 1950 to 20 December 19501951: 18 February 1951 to 15 December 19511952: 8 January 1952 to 9 November 19521953: 5 January 1953 to 7 December 19531954: 29 January 1954 to 21 November 19541955: 11 February 1955 to 31 December 19551956: 11 January 1956 to 14 October 19561958: 19 February 1958 to 18 December 19581959: 26 January 1959 to 26 December 19591960: 23 January 1960 to 15 December 19601962: 12 January 1962 to 2 November 19621963: 17 January 1963 to 8 November 19631964: 2 February 1964 to 24 December 19641965: 11 January 1965 to 23 December 19651966: 5 February 1966 to 23 December 19661967: 16 January 1967 to 19 December 19671968: 5 March 1968 to 27 August 19681969: 12 January 1969 to 30 December 19691970: 3 January 1970 to 31 December 19701971: 1 January 1971 to 14 November 19711972: 10 January 1972 to 7 November 19721973: 5 February 1973 to 22 December 197319321937194219471952195819641969JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Swansea (the Grange) meeting 10 mm (0.39 in).
First to last qualifying date each year at Swansea (the Grange)
YearFirst dateLast date
19321932-02-151932-12-24
19331933-01-261933-12-21
19341934-01-091934-12-31
19351935-01-061935-12-21
19361936-01-221936-12-21
19371937-01-021937-12-26
19381938-01-151938-11-22
19391939-02-171939-11-25
19401940-01-221940-12-08
19411941-01-161941-12-08
19421942-02-201942-12-24
19431943-01-041943-12-05
19441944-01-031944-12-21
19451945-01-161945-12-26
19461946-01-201946-12-15
19471947-02-041947-12-22
19481948-01-051948-11-01
19491949-01-011949-12-07
19501950-03-131950-12-20
19511951-02-181951-12-15
19521952-01-081952-11-09
19531953-01-051953-12-07
19541954-01-291954-11-21
19551955-02-111955-12-31
19561956-01-111956-10-14
19581958-02-191958-12-18
19591959-01-261959-12-26
19601960-01-231960-12-15
19621962-01-121962-11-02
19631963-01-171963-11-08
19641964-02-021964-12-24
19651965-01-111965-12-23
19661966-02-051966-12-23
19671967-01-161967-12-19
19681968-03-051968-08-27
19691969-01-121969-12-30
19701970-01-031970-12-31
19711971-01-011971-11-14
19721972-01-101972-11-07
19731973-02-051973-12-22

Every Fixed Threshold

Fixed thresholds at Swansea (the Grange)
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4030197016
25 mm (0.98 in): Days with 25 mm or more rain401119565
50 mm (1.97 in): Days with 50 mm or more rain25519692
100 mm (3.94 in): Days with 100 mm or more rain4219461

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

Download the Data

  • Data for Swansea (the Grange) 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).