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

London 3N Threshold Days by Year (USC00415312)

3 fixed thresholds counted per year at London 3N (USC00415312): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for London 3N Thresholds

  • London 3N: days with 10 mm (0.39 in) or more of precipitation in 11 years, most in 2003 with 26.
  • London 3N: days with 25 mm (0.98 in) or more of precipitation in 11 years, most in 2016 with 15.
  • London 3N: days with 50 mm (1.97 in) or more of precipitation in 10 years, most in 2006 with 3.
  • 3 fixed thresholds have at least one qualifying day at London 3N.
11 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at London 3N Days per year at London 3N with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 26 in 2003. 01020302003: 262004: 262005: 192006: 132007: 252008: 112009: 152013: 212014: 142015: 162016: 26200320052007200920142016
Days per year at London 3N with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 26 in 2003.
Days with 10 mm (0.39 in) or more of precipitation per year at London 3N
YearDaysDecade average
20032619.3
20042619.3
20051919.3
20061319.3
20072519.3
20081119.3
20091519.3
20132119.3
20141419.3
20151619.3
20162619.3
First to last qualifying date each year at London 3N For each year, a bar from the first to the last day at London 3N meeting 10 mm (0.39 in). 2003: 14 February 2003 to 11 October 20032004: 14 January 2004 to 7 December 20042005: 28 January 2005 to 10 October 20052006: 28 January 2006 to 18 October 20062007: 4 January 2007 to 25 November 20072008: 10 March 2008 to 6 October 20082009: 9 February 2009 to 1 December 20092013: 5 January 2013 to 21 December 20132014: 24 May 2014 to 23 November 20142015: 3 January 2015 to 27 December 20152016: 23 February 2016 to 3 December 2016200320052007200920142016JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at London 3N meeting 10 mm (0.39 in).
First to last qualifying date each year at London 3N
YearFirst dateLast date
20032003-02-142003-10-11
20042004-01-142004-12-07
20052005-01-282005-10-10
20062006-01-282006-10-18
20072007-01-042007-11-25
20082008-03-102008-10-06
20092009-02-092009-12-01
20132013-01-052013-12-21
20142014-05-242014-11-23
20152015-01-032015-12-27
20162016-02-232016-12-03

Every Fixed Threshold

Fixed thresholds at London 3N
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1126200326
25 mm (0.98 in): Days with 25 mm or more rain1115201615
50 mm (1.97 in): Days with 50 mm or more rain10320061

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2003.

Download the Data

  • Data for London 3N 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).