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Built 2026-10-19 (19 October 2026)

Arachu Threshold Days by Year (BR027597790)

4 fixed thresholds counted per year at Arachu (BR027597790): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arachu Thresholds

  • Arachu: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1912 with 78.
  • Arachu: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1912 with 45.
  • Arachu: days with 50 mm (1.97 in) or more of precipitation in 30 years, most in 1912 with 14.
  • Arachu: days with 100 mm (3.94 in) or more of precipitation in 4 years, most in 1912 with 2.
  • 4 fixed thresholds have at least one qualifying day at Arachu.
35 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Arachu Days per year at Arachu with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 78 in 1912. 0204060801912: 781913: 421914: 431915: 71916: 351917: 431918: 321919: 41920: 431921: 241922: 211923: 301924: 551925: 331926: 561927: 221928: 231929: 381930: 261948: 301949: 261950: 281951: 121952: 261953: 101956: 291957: 361958: 131962: 401963: 591964: 571965: 431966: 231969: 271970: 28191219161920192419281949195319621966
Days per year at Arachu with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 78 in 1912.
Days with 10 mm (0.39 in) or more of precipitation per year at Arachu
YearDaysDecade average
19127835.5
19134235.5
19144335.5
1915735.5
19163535.5
19174335.5
19183235.5
1919435.5
19204334.5
19212434.5
19222134.5
19233034.5
19245534.5
19253334.5
19265634.5
19272234.5
19282334.5
19293834.5
19302626
19483028
19492628
19502822
19511222
19522622
19531022
19562922
19573622
19581322
19624041.5
19635941.5
19645741.5
19654341.5
19662341.5
19692741.5
19702828
First to last qualifying date each year at Arachu For each year, a bar from the first to the last day at Arachu meeting 10 mm (0.39 in). 1912: 16 January 1912 to 24 August 19121913: 4 February 1913 to 20 July 19131914: 15 January 1914 to 11 September 19141915: 1 February 1915 to 10 May 19151916: 6 February 1916 to 18 November 19161917: 3 January 1917 to 28 November 19171918: 5 January 1918 to 31 December 19181919: 1 January 1919 to 3 May 19191920: 18 February 1920 to 29 December 19201921: 3 January 1921 to 24 June 19211922: 7 March 1922 to 24 July 19221923: 6 January 1923 to 29 May 19231924: 13 January 1924 to 17 June 19241925: 26 January 1925 to 10 June 19251926: 12 January 1926 to 13 June 19261927: 22 January 1927 to 26 July 19271928: 6 January 1928 to 22 May 19281929: 12 January 1929 to 19 June 19291930: 22 January 1930 to 10 July 19301948: 5 January 1948 to 29 June 19481949: 30 January 1949 to 13 July 19491950: 9 January 1950 to 9 May 19501951: 9 January 1951 to 27 December 19511952: 6 February 1952 to 1 June 19521953: 15 January 1953 to 2 June 19531956: 31 January 1956 to 26 December 19561957: 10 January 1957 to 11 July 19571958: 2 January 1958 to 4 June 19581962: 16 January 1962 to 12 June 19621963: 13 January 1963 to 28 December 19631964: 3 January 1964 to 7 July 19641965: 25 January 1965 to 4 October 19651966: 9 February 1966 to 20 November 19661969: 4 January 1969 to 4 July 19691970: 22 January 1970 to 9 November 19701912191719221927194919561964JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Arachu meeting 10 mm (0.39 in).
First to last qualifying date each year at Arachu
YearFirst dateLast date
19121912-01-161912-08-24
19131913-02-041913-07-20
19141914-01-151914-09-11
19151915-02-011915-05-10
19161916-02-061916-11-18
19171917-01-031917-11-28
19181918-01-051918-12-31
19191919-01-011919-05-03
19201920-02-181920-12-29
19211921-01-031921-06-24
19221922-03-071922-07-24
19231923-01-061923-05-29
19241924-01-131924-06-17
19251925-01-261925-06-10
19261926-01-121926-06-13
19271927-01-221927-07-26
19281928-01-061928-05-22
19291929-01-121929-06-19
19301930-01-221930-07-10
19481948-01-051948-06-29
19491949-01-301949-07-13
19501950-01-091950-05-09
19511951-01-091951-12-27
19521952-02-061952-06-01
19531953-01-151953-06-02
19561956-01-311956-12-26
19571957-01-101957-07-11
19581958-01-021958-06-04
19621962-01-161962-06-12
19631963-01-131963-12-28
19641964-01-031964-07-07
19651965-01-251965-10-04
19661966-02-091966-11-20
19691969-01-041969-07-04
19701970-01-221970-11-09

Every Fixed Threshold

Fixed thresholds at Arachu
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3578191228
25 mm (0.98 in): Days with 25 mm or more rain354519126
50 mm (1.97 in): Days with 50 mm or more rain301419124
100 mm (3.94 in): Days with 100 mm or more rain4219121

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

  • Data for Arachu 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).