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Built 2026-10-19 (19 October 2026)

South Londonderry Threshold Days by Year (USC00437617)

7 fixed thresholds counted per year at South Londonderry (USC00437617): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for South Londonderry Thresholds

  • South Londonderry: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1983 with 55.
  • South Londonderry: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1976 with 18.
  • South Londonderry: days with 10 cm (3.9 in) or more of snowfall in 30 years, most in 1956 with 14.
  • South Londonderry: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 1941 with 4.
  • 7 fixed thresholds have at least one qualifying day at South Londonderry.
36 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at South Londonderry Days per year at South Londonderry with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1983. 02040601931: 341932: 351933: 331941: 221942: 341943: 411948: 331952: 291953: 451954: 421955: 291956: 391957: 371958: 361959: 411960: 351961: 341962: 361963: 271964: 281965: 301966: 381967: 381968: 361969: 451973: 401974: 421975: 451976: 411977: 411978: 371979: 421980: 271981: 371982: 361983: 55193119421953195719611965196919761980
Days per year at South Londonderry with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1983.
Days with 10 mm (0.39 in) or more of precipitation per year at South Londonderry
YearDaysDecade average
19313434
19323534
19333334
19412232.5
19423432.5
19434132.5
19483332.5
19522937.3
19534537.3
19544237.3
19552937.3
19563937.3
19573737.3
19583637.3
19594137.3
19603534.7
19613434.7
19623634.7
19632734.7
19642834.7
19653034.7
19663834.7
19673834.7
19683634.7
19694534.7
19734041.1
19744241.1
19754541.1
19764141.1
19774141.1
19783741.1
19794241.1
19802738.8
19813738.8
19823638.8
19835538.8
First to last qualifying date each year at South Londonderry For each year, a bar from the first to the last day at South Londonderry meeting 10 mm (0.39 in). 1931: 6 January 1931 to 23 December 19311932: 3 January 1932 to 24 December 19321933: 23 January 1933 to 27 December 19331941: 25 January 1941 to 25 December 19411942: 2 January 1942 to 31 December 19421943: 20 January 1943 to 27 December 19431948: 3 January 1948 to 31 December 19481952: 16 January 1952 to 12 December 19521953: 4 January 1953 to 15 December 19531954: 27 January 1954 to 30 December 19541955: 7 February 1955 to 5 December 19551956: 9 January 1956 to 23 December 19561957: 23 January 1957 to 27 December 19571958: 1 January 1958 to 6 December 19581959: 2 January 1959 to 29 December 19591960: 3 January 1960 to 22 December 19601961: 2 January 1961 to 20 December 19611962: 7 January 1962 to 30 December 19621963: 13 January 1963 to 9 December 19631964: 2 January 1964 to 28 December 19641965: 24 January 1965 to 26 December 19651966: 24 January 1966 to 26 December 19661967: 8 January 1967 to 29 December 19671968: 7 January 1968 to 28 December 19681969: 7 January 1969 to 28 December 19691973: 1 January 1973 to 27 December 19731974: 1 January 1974 to 17 December 19741975: 19 January 1975 to 31 December 19751976: 12 January 1976 to 8 December 19761977: 8 January 1977 to 22 December 19771978: 9 January 1978 to 25 December 19781979: 3 January 1979 to 25 December 19791980: 12 January 1980 to 16 December 19801981: 2 February 1981 to 28 December 19811982: 2 January 1982 to 17 December 19821983: 11 January 1983 to 29 December 198319311943195519601965197319781983JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at South Londonderry meeting 10 mm (0.39 in).
First to last qualifying date each year at South Londonderry
YearFirst dateLast date
19311931-01-061931-12-23
19321932-01-031932-12-24
19331933-01-231933-12-27
19411941-01-251941-12-25
19421942-01-021942-12-31
19431943-01-201943-12-27
19481948-01-031948-12-31
19521952-01-161952-12-12
19531953-01-041953-12-15
19541954-01-271954-12-30
19551955-02-071955-12-05
19561956-01-091956-12-23
19571957-01-231957-12-27
19581958-01-011958-12-06
19591959-01-021959-12-29
19601960-01-031960-12-22
19611961-01-021961-12-20
19621962-01-071962-12-30
19631963-01-131963-12-09
19641964-01-021964-12-28
19651965-01-241965-12-26
19661966-01-241966-12-26
19671967-01-081967-12-29
19681968-01-071968-12-28
19691969-01-071969-12-28
19731973-01-011973-12-27
19741974-01-011974-12-17
19751975-01-191975-12-31
19761976-01-121976-12-08
19771977-01-081977-12-22
19781978-01-091978-12-25
19791979-01-031979-12-25
19801980-01-121980-12-16
19811981-02-021981-12-28
19821982-01-021982-12-17
19831983-01-111983-12-29

Every Fixed Threshold

Fixed thresholds at South Londonderry
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3655198355
25 mm (0.98 in): Days with 25 mm or more rain3618197615
50 mm (1.97 in): Days with 50 mm or more rain24419411
100 mm (3.94 in): Days with 100 mm or more rain1119731
10 cm (3.9 in): Days with 10 cm or more snowfall301419567
25 cm (9.8 in): Days with 25 cm or more snowfall24519581
50 cm (19.7 in): Days with 50 cm or more snowfall1119331

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1931.

Download the Data

  • Data for South Londonderry 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).