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

Merton Weir Farm Threshold Days by Year

4 fixed thresholds counted per year at Merton Weir Farm (ASN00088112): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Merton Weir Farm Thresholds

  • Merton Weir Farm: days with 10 mm (0.39 in) or more of precipitation in 59 years, most in 1955 with 38.
  • Merton Weir Farm: days with 25 mm (0.98 in) or more of precipitation in 59 years, most in 1955 with 13.
  • Merton Weir Farm: days with 50 mm (1.97 in) or more of precipitation in 21 years, most in 1907 with 2.
  • Merton Weir Farm: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1916 with 1.
  • 4 fixed thresholds have at least one qualifying day at Merton Weir Farm.
59 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Merton Weir Farm Days per year at Merton Weir Farm with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 1955. 0102030401904: 251905: 191906: 291907: 221909: 321910: 221911: 231912: 211913: 221914: 151915: 331916: 321934: 231935: 261939: 251940: 171941: 201943: 181944: 161945: 221946: 251947: 331948: 211949: 291950: 311951: 241953: 261955: 381957: 161958: 261959: 151960: 341961: 191964: 321965: 151966: 331967: 141968: 301969: 211970: 231971: 271972: 101973: 351974: 301975: 301976: 161977: 171978: 311979: 181980: 211981: 291982: 81983: 311984: 211985: 261986: 301987: 251988: 351989: 361904191119341944195019591967197319791985
Days per year at Merton Weir Farm with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 1955.
Days with 10 mm (0.39 in) or more of precipitation per year at Merton Weir Farm
YearDaysDecade average
19042525.4
19051925.4
19062925.4
19072225.4
19093225.4
19102224
19112324
19122124
19132224
19141524
19153324
19163224
19342324.7
19352624.7
19392524.7
19401722.3
19412022.3
19431822.3
19441622.3
19452222.3
19462522.3
19473322.3
19482122.3
19492922.3
19503125.1
19512425.1
19532625.1
19553825.1
19571625.1
19582625.1
19591525.1
19603424.8
19611924.8
19643224.8
19651524.8
19663324.8
19671424.8
19683024.8
19692124.8
19702323.7
19712723.7
19721023.7
19733523.7
19743023.7
19753023.7
19761623.7
19771723.7
19783123.7
19791823.7
19802126.2
19812926.2
1982826.2
19833126.2
19842126.2
19852626.2
19863026.2
19872526.2
19883526.2
19893626.2
First to last qualifying date each year at Merton Weir Farm For each year, a bar from the first to the last day at Merton Weir Farm meeting 10 mm (0.39 in). 1904: 2 January 1904 to 18 December 19041905: 16 January 1905 to 31 December 19051906: 2 March 1906 to 29 November 19061907: 25 January 1907 to 27 December 19071909: 4 January 1909 to 1 December 19091910: 15 January 1910 to 23 December 19101911: 14 January 1911 to 1 December 19111912: 8 February 1912 to 9 December 19121913: 15 February 1913 to 30 December 19131914: 26 January 1914 to 26 December 19141915: 31 January 1915 to 15 December 19151916: 29 January 1916 to 12 December 19161934: 19 February 1934 to 1 December 19341935: 8 February 1935 to 24 October 19351939: 17 January 1939 to 5 December 19391940: 16 February 1940 to 27 December 19401941: 3 January 1941 to 5 December 19411943: 22 January 1943 to 18 November 19431944: 10 March 1944 to 8 November 19441945: 10 January 1945 to 20 November 19451946: 17 January 1946 to 28 December 19461947: 5 March 1947 to 21 December 19471948: 4 February 1948 to 28 December 19481949: 21 February 1949 to 21 December 19491950: 3 February 1950 to 30 December 19501951: 7 January 1951 to 27 November 19511953: 6 February 1953 to 27 December 19531955: 29 January 1955 to 21 December 19551957: 8 February 1957 to 29 December 19571958: 8 February 1958 to 14 November 19581959: 25 January 1959 to 27 December 19591960: 10 January 1960 to 21 November 19601961: 1 January 1961 to 19 December 19611964: 8 April 1964 to 23 December 19641965: 17 May 1965 to 8 December 19651966: 30 January 1966 to 26 December 19661967: 16 January 1967 to 18 December 19671968: 21 January 1968 to 24 December 19681969: 27 January 1969 to 2 December 19691970: 2 January 1970 to 10 December 19701971: 9 February 1971 to 14 December 19711972: 17 February 1972 to 7 December 19721973: 13 January 1973 to 31 December 19731974: 4 January 1974 to 29 November 19741975: 15 March 1975 to 29 December 19751976: 15 January 1976 to 24 December 19761977: 15 January 1977 to 30 November 19771978: 6 January 1978 to 26 December 19781979: 17 January 1979 to 24 November 19791980: 4 January 1980 to 14 December 19801981: 10 January 1981 to 10 November 19811982: 26 January 1982 to 8 December 19821983: 2 January 1983 to 7 December 19831984: 1 January 1984 to 11 November 19841985: 31 January 1985 to 12 December 19851986: 16 January 1986 to 17 December 19861987: 5 January 1987 to 2 December 19871988: 1 January 1988 to 25 December 19881989: 14 February 1989 to 15 December 198919041913194119501961197119791987JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Merton Weir Farm meeting 10 mm (0.39 in).
First to last qualifying date each year at Merton Weir Farm
YearFirst dateLast date
19041904-01-021904-12-18
19051905-01-161905-12-31
19061906-03-021906-11-29
19071907-01-251907-12-27
19091909-01-041909-12-01
19101910-01-151910-12-23
19111911-01-141911-12-01
19121912-02-081912-12-09
19131913-02-151913-12-30
19141914-01-261914-12-26
19151915-01-311915-12-15
19161916-01-291916-12-12
19341934-02-191934-12-01
19351935-02-081935-10-24
19391939-01-171939-12-05
19401940-02-161940-12-27
19411941-01-031941-12-05
19431943-01-221943-11-18
19441944-03-101944-11-08
19451945-01-101945-11-20
19461946-01-171946-12-28
19471947-03-051947-12-21
19481948-02-041948-12-28
19491949-02-211949-12-21
19501950-02-031950-12-30
19511951-01-071951-11-27
19531953-02-061953-12-27
19551955-01-291955-12-21
19571957-02-081957-12-29
19581958-02-081958-11-14
19591959-01-251959-12-27
19601960-01-101960-11-21
19611961-01-011961-12-19
19641964-04-081964-12-23
19651965-05-171965-12-08
19661966-01-301966-12-26
19671967-01-161967-12-18
19681968-01-211968-12-24
19691969-01-271969-12-02
19701970-01-021970-12-10
19711971-02-091971-12-14
19721972-02-171972-12-07
19731973-01-131973-12-31
19741974-01-041974-11-29
19751975-03-151975-12-29
19761976-01-151976-12-24
19771977-01-151977-11-30
19781978-01-061978-12-26
19791979-01-171979-11-24
19801980-01-041980-12-14
19811981-01-101981-11-10
19821982-01-261982-12-08
19831983-01-021983-12-07
19841984-01-011984-11-11
19851985-01-311985-12-12
19861986-01-161986-12-17
19871987-01-051987-12-02
19881988-01-011988-12-25
19891989-02-141989-12-15

Every Fixed Threshold

Fixed thresholds at Merton Weir Farm
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5938195536
25 mm (0.98 in): Days with 25 mm or more rain591319556
50 mm (1.97 in): Days with 50 mm or more rain21219072
100 mm (3.94 in): Days with 100 mm or more rain2119161

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

  • Data for Merton Weir Farm 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).