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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Semaphore 1 Threshold Days by Year

3 fixed thresholds counted per year at Semaphore 1 (ASN00023049): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Semaphore 1 Thresholds

  • Semaphore 1: days with 10 mm (0.39 in) or more of precipitation in 17 years, most in 1923 with 20.
  • Semaphore 1: days with 25 mm (0.98 in) or more of precipitation in 11 years, most in 1910 with 5.
  • Semaphore 1: days with 50 mm (1.97 in) or more of precipitation in 3 years, most in 1920 with 2.
  • 3 fixed thresholds have at least one qualifying day at Semaphore 1.
17 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Semaphore 1 Days per year at Semaphore 1 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 20 in 1923. 051015201907: 101908: 121909: 151910: 151911: 71912: 61913: 91914: 51915: 91916: 121917: 91918: 51919: 141920: 141921: 131922: 151923: 20190719091911191319151917191919211923
Days per year at Semaphore 1 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 20 in 1923.
Days with 10 mm (0.39 in) or more of precipitation per year at Semaphore 1
YearDaysDecade average
19071012.3
19081212.3
19091512.3
1910159.1
191179.1
191269.1
191399.1
191459.1
191599.1
1916129.1
191799.1
191859.1
1919149.1
19201415.5
19211315.5
19221515.5
19232015.5
First to last qualifying date each year at Semaphore 1 For each year, a bar from the first to the last day at Semaphore 1 meeting 10 mm (0.39 in). 1907: 5 April 1907 to 3 November 19071908: 31 January 1908 to 21 December 19081909: 6 March 1909 to 13 November 19091910: 5 March 1910 to 18 October 19101911: 1 February 1911 to 4 December 19111912: 9 March 1912 to 9 October 19121913: 3 January 1913 to 23 December 19131914: 13 March 1914 to 15 December 19141915: 11 April 1915 to 15 November 19151916: 3 June 1916 to 22 October 19161917: 14 February 1917 to 21 November 19171918: 10 May 1918 to 7 October 19181919: 16 February 1919 to 27 December 19191920: 6 March 1920 to 27 December 19201921: 2 January 1921 to 26 November 19211922: 5 January 1922 to 25 December 19221923: 7 May 1923 to 18 December 1923190719101913191619191922JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Semaphore 1 meeting 10 mm (0.39 in).
First to last qualifying date each year at Semaphore 1
YearFirst dateLast date
19071907-04-051907-11-03
19081908-01-311908-12-21
19091909-03-061909-11-13
19101910-03-051910-10-18
19111911-02-011911-12-04
19121912-03-091912-10-09
19131913-01-031913-12-23
19141914-03-131914-12-15
19151915-04-111915-11-15
19161916-06-031916-10-22
19171917-02-141917-11-21
19181918-05-101918-10-07
19191919-02-161919-12-27
19201920-03-061920-12-27
19211921-01-021921-11-26
19221922-01-051922-12-25
19231923-05-071923-12-18

Every Fixed Threshold

Fixed thresholds at Semaphore 1
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1720192320
25 mm (0.98 in): Days with 25 mm or more rain11519105
50 mm (1.97 in): Days with 50 mm or more rain3219201

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

Download the Data

  • Data for Semaphore 1 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).