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Built 2026-10-19 (19 October 2026)

London South Threshold Days by Year (CA006144505)

19 fixed thresholds counted per year at London South (CA006144505): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for London South Thresholds

  • London South: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 1921 with 46.
  • London South: days with a maximum temperature at or below 0 C (32 F) in 47 years, most in 1904 with 87.
  • London South: nights with a minimum temperature at or below 0 C (32 F) in 47 years, most in 1887 with 177.
  • London South: nights with a minimum temperature at or below -10 C (14 F) in 47 years, most in 1885 with 71.
  • 19 fixed thresholds have at least one qualifying day at London South.
47 years with a qualifying day
Days at or above 30 C (86 F) per year at London South Days per year at London South with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1921. 02040601884: 141885: 11886: 51887: 241888: 71889: 51891: 151892: 141893: 211894: 291895: 291896: 211897: 161898: 311899: 301900: 261901: 321902: 101903: 71904: 61905: 41906: 141907: 71908: 371909: 301910: 251911: 431912: 231913: 291914: 321915: 121916: 421917: 161918: 291919: 431920: 161921: 461922: 261923: 371924: 141925: 251926: 121927: 121928: 161929: 281930: 291931: 361884188918951900190519101915192019251930
Days per year at London South with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1921.
Days at or above 30 C (86 F) per year at London South
YearDaysDecade average
1884149.3
188519.3
188659.3
1887249.3
188879.3
188959.3
18911522.9
18921422.9
18932122.9
18942922.9
18952922.9
18962122.9
18971622.9
18983122.9
18993022.9
19002617.3
19013217.3
19021017.3
1903717.3
1904617.3
1905417.3
19061417.3
1907717.3
19083717.3
19093017.3
19102529.4
19114329.4
19122329.4
19132929.4
19143229.4
19151229.4
19164229.4
19171629.4
19182929.4
19194329.4
19201623.2
19214623.2
19222623.2
19233723.2
19241423.2
19252523.2
19261223.2
19271223.2
19281623.2
19292823.2
19302932.5
19313632.5
First to last qualifying date each year at London South For each year, a bar from the first to the last day at London South meeting 30 C (86 F). 1884: 23 June 1884 to 10 September 18841885: 24 July 1885 to 24 July 18851886: 5 July 1886 to 28 August 18861887: 22 May 1887 to 13 September 18871888: 17 June 1888 to 26 August 18881889: 8 July 1889 to 2 September 18891891: 14 June 1891 to 18 September 18911892: 12 June 1892 to 18 August 18921893: 15 June 1893 to 24 August 18931894: 10 June 1894 to 4 September 18941895: 5 May 1895 to 22 September 18951896: 8 May 1896 to 11 September 18961897: 2 July 1897 to 16 September 18971898: 3 June 1898 to 3 September 18981899: 4 June 1899 to 2 September 18991900: 24 June 1900 to 26 September 19001901: 12 June 1901 to 7 September 19011902: 22 May 1902 to 31 August 19021903: 18 May 1903 to 15 September 19031904: 19 June 1904 to 19 July 19041905: 17 July 1905 to 12 August 19051906: 29 June 1906 to 19 September 19061907: 18 June 1907 to 11 August 19071908: 25 May 1908 to 26 September 19081909: 21 June 1909 to 14 September 19091910: 16 June 1910 to 15 August 19101911: 18 May 1911 to 2 September 19111912: 25 June 1912 to 10 September 19121913: 6 June 1913 to 7 September 19131914: 25 May 1914 to 22 September 19141915: 25 April 1915 to 16 September 19151916: 2 July 1916 to 7 September 19161917: 9 July 1917 to 20 August 19171918: 31 May 1918 to 25 August 19181919: 29 May 1919 to 20 September 19191920: 10 June 1920 to 26 September 19201921: 20 May 1921 to 10 September 19211922: 6 June 1922 to 10 September 19221923: 1 June 1923 to 27 September 19231924: 20 June 1924 to 31 August 19241925: 23 April 1925 to 20 September 19251926: 29 June 1926 to 28 August 19261927: 29 June 1927 to 15 September 19271928: 3 July 1928 to 10 September 19281929: 27 May 1929 to 5 September 19291930: 7 May 1930 to 14 September 19301931: 29 May 1931 to 22 September 193118841891189719031909191519211927JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at London South meeting 30 C (86 F).
First to last qualifying date each year at London South
YearFirst dateLast date
18841884-06-231884-09-10
18851885-07-241885-07-24
18861886-07-051886-08-28
18871887-05-221887-09-13
18881888-06-171888-08-26
18891889-07-081889-09-02
18911891-06-141891-09-18
18921892-06-121892-08-18
18931893-06-151893-08-24
18941894-06-101894-09-04
18951895-05-051895-09-22
18961896-05-081896-09-11
18971897-07-021897-09-16
18981898-06-031898-09-03
18991899-06-041899-09-02
19001900-06-241900-09-26
19011901-06-121901-09-07
19021902-05-221902-08-31
19031903-05-181903-09-15
19041904-06-191904-07-19
19051905-07-171905-08-12
19061906-06-291906-09-19
19071907-06-181907-08-11
19081908-05-251908-09-26
19091909-06-211909-09-14
19101910-06-161910-08-15
19111911-05-181911-09-02
19121912-06-251912-09-10
19131913-06-061913-09-07
19141914-05-251914-09-22
19151915-04-251915-09-16
19161916-07-021916-09-07
19171917-07-091917-08-20
19181918-05-311918-08-25
19191919-05-291919-09-20
19201920-06-101920-09-26
19211921-05-201921-09-10
19221922-06-061922-09-10
19231923-06-011923-09-27
19241924-06-201924-08-31
19251925-04-231925-09-20
19261926-06-291926-08-28
19271927-06-291927-09-15
19281928-07-031928-09-10
19291929-05-271929-09-05
19301930-05-071930-09-14
19311931-05-291931-09-22

Every Fixed Threshold

Fixed thresholds at London South
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days4746192136
35 C (95 F): Days23919115
40 C (104 F): Days1119181
90 F (32.2 C): Days4128191915
100 F (37.8 C): Days4319111
0 C (32 F): Ice days (max4787190433
0 C (32 F): Frost days (min471771887155
-10 C (14 F): Days with min4771188520
-20 C (-4 F): Days with min453118855
-30 C (-22 F): Days with min10318991
20 C (68 F): Tropical nights (min4718192112
25 C (77 F): Days with min2119021
10 mm (0.39 in): Days with 10 mm or more rain4744191223
25 mm (0.98 in): Days with 25 mm or more rain451519133
50 mm (1.97 in): Days with 50 mm or more rain18318921
100 mm (3.94 in): Days with 100 mm or more rain1118941
10 cm (3.9 in): Days with 10 cm or more snowfall461518893
25 cm (9.8 in): Days with 25 cm or more snowfall13318841
50 cm (19.7 in): Days with 50 cm or more snowfall1118861

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1884.

Download the Data

  • Data for London South 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 (2026-10-17).