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

Riachao Threshold Days by Year (BR028920120)

4 fixed thresholds counted per year at Riachao (BR028920120): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riachao Thresholds

  • Riachao: days with 10 mm (0.39 in) or more of precipitation in 17 years, most in 1921 with 67.
  • Riachao: days with 25 mm (0.98 in) or more of precipitation in 17 years, most in 1921 with 28.
  • Riachao: days with 50 mm (1.97 in) or more of precipitation in 12 years, most in 1917 with 8.
  • Riachao: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1917 with 1.
  • 4 fixed thresholds have at least one qualifying day at Riachao.
17 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Riachao Days per year at Riachao with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 67 in 1921. 0204060801912: 341913: 381914: 131915: 81916: 401917: 481918: 321919: 81920: 261921: 671922: 541926: 351927: 221928: 191929: 301930: 161962: 15191219141916191819201922192719291962
Days per year at Riachao with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 67 in 1921.
Days with 10 mm (0.39 in) or more of precipitation per year at Riachao
YearDaysDecade average
19123427.6
19133827.6
19141327.6
1915827.6
19164027.6
19174827.6
19183227.6
1919827.6
19202636.1
19216736.1
19225436.1
19263536.1
19272236.1
19281936.1
19293036.1
19301616
19621515
First to last qualifying date each year at Riachao For each year, a bar from the first to the last day at Riachao meeting 10 mm (0.39 in). 1912: 24 January 1912 to 5 August 19121913: 7 February 1913 to 3 December 19131914: 15 January 1914 to 20 June 19141915: 3 February 1915 to 17 December 19151916: 12 January 1916 to 29 December 19161917: 1 January 1917 to 15 June 19171918: 8 January 1918 to 25 September 19181919: 1 January 1919 to 13 September 19191920: 16 February 1920 to 31 December 19201921: 3 January 1921 to 5 December 19211922: 15 January 1922 to 22 December 19221926: 6 January 1926 to 18 May 19261927: 27 January 1927 to 4 July 19271928: 30 January 1928 to 1 July 19281929: 19 January 1929 to 7 December 19291930: 21 January 1930 to 4 August 19301962: 1 February 1962 to 16 December 1962191219151918192119271930JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Riachao meeting 10 mm (0.39 in).
First to last qualifying date each year at Riachao
YearFirst dateLast date
19121912-01-241912-08-05
19131913-02-071913-12-03
19141914-01-151914-06-20
19151915-02-031915-12-17
19161916-01-121916-12-29
19171917-01-011917-06-15
19181918-01-081918-09-25
19191919-01-011919-09-13
19201920-02-161920-12-31
19211921-01-031921-12-05
19221922-01-151922-12-22
19261926-01-061926-05-18
19271927-01-271927-07-04
19281928-01-301928-07-01
19291929-01-191929-12-07
19301930-01-211930-08-04
19621962-02-011962-12-16

Every Fixed Threshold

Fixed thresholds at Riachao
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1767192115
25 mm (0.98 in): Days with 25 mm or more rain172819214
50 mm (1.97 in): Days with 50 mm or more rain12819171
100 mm (3.94 in): Days with 100 mm or more rain1119171

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 Riachao 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).