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Built 2026-10-19 (19 October 2026)

London Threshold Days by Year (USC00154893)

4 fixed thresholds counted per year at London (USC00154893): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for London Thresholds

  • London: days with 10 mm (0.39 in) or more of precipitation in 8 years, most in 1915 with 55.
  • London: days with 25 mm (0.98 in) or more of precipitation in 8 years, most in 1915 with 18.
  • London: days with 50 mm (1.97 in) or more of precipitation in 6 years, most in 1918 with 4.
  • London: days with 10 cm (3.9 in) or more of snowfall in 1 years, most in 1917 with 3.
  • 4 fixed thresholds have at least one qualifying day at London.
8 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at London Days per year at London with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1915. 02040601915: 551916: 371917: 451918: 541919: 451920: 481949: 301950: 5319151916191719181919192019491950
Days per year at London with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1915.
Days with 10 mm (0.39 in) or more of precipitation per year at London
YearDaysDecade average
19155547.2
19163747.2
19174547.2
19185447.2
19194547.2
19204848
19493030
19505353
First to last qualifying date each year at London For each year, a bar from the first to the last day at London meeting 10 mm (0.39 in). 1915: 6 January 1915 to 29 December 19151916: 1 January 1916 to 28 December 19161917: 3 January 1917 to 25 December 19171918: 2 January 1918 to 31 December 19181919: 1 January 1919 to 14 December 19191920: 1 January 1920 to 14 December 19201949: 18 January 1949 to 22 December 19491950: 5 January 1950 to 7 December 195019151916191719181919192019491950JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at London meeting 10 mm (0.39 in).
First to last qualifying date each year at London
YearFirst dateLast date
19151915-01-061915-12-29
19161916-01-011916-12-28
19171917-01-031917-12-25
19181918-01-021918-12-31
19191919-01-011919-12-14
19201920-01-011920-12-14
19491949-01-181949-12-22
19501950-01-051950-12-07

Every Fixed Threshold

Fixed thresholds at London
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain855191553
25 mm (0.98 in): Days with 25 mm or more rain818191512
50 mm (1.97 in): Days with 50 mm or more rain6419182
10 cm (3.9 in): Days with 10 cm or more snowfall1319173

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1915.

Download the Data

  • Data for London 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).