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

Rio Formoso Threshold Days by Year (BR038793720)

4 fixed thresholds counted per year at Rio Formoso (BR038793720): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rio Formoso Thresholds

  • Rio Formoso: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 1964 with 110.
  • Rio Formoso: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1934 with 39.
  • Rio Formoso: days with 50 mm (1.97 in) or more of precipitation in 40 years, most in 1974 with 19.
  • Rio Formoso: days with 100 mm (3.94 in) or more of precipitation in 10 years, most in 1935 with 3.
  • 4 fixed thresholds have at least one qualifying day at Rio Formoso.
41 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rio Formoso Days per year at Rio Formoso with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 110 in 1964. 0501001501934: 1001935: 781936: 681937: 591938: 521939: 641940: 691941: 611942: 761943: 651944: 661945: 621946: 501947: 601948: 651949: 581950: 751951: 781952: 541953: 701954: 621955: 771956: 541957: 631958: 641959: 711960: 611961: 841962: 501963: 701964: 1101965: 431966: 831967: 741968: 611969: 741970: 691971: 641972: 831973: 731974: 70193419391944194919541959196419691974
Days per year at Rio Formoso with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 110 in 1964.
Days with 10 mm (0.39 in) or more of precipitation per year at Rio Formoso
YearDaysDecade average
193410070.2
19357870.2
19366870.2
19375970.2
19385270.2
19396470.2
19406963.2
19416163.2
19427663.2
19436563.2
19446663.2
19456263.2
19465063.2
19476063.2
19486563.2
19495863.2
19507566.8
19517866.8
19525466.8
19537066.8
19546266.8
19557766.8
19565466.8
19576366.8
19586466.8
19597166.8
19606171
19618471
19625071
19637071
196411071
19654371
19668371
19677471
19686171
19697471
19706971.8
19716471.8
19728371.8
19737371.8
19747071.8
First to last qualifying date each year at Rio Formoso For each year, a bar from the first to the last day at Rio Formoso meeting 10 mm (0.39 in). 1934: 9 February 1934 to 23 December 19341935: 6 January 1935 to 31 December 19351936: 5 February 1936 to 7 August 19361937: 7 February 1937 to 30 December 19371938: 6 January 1938 to 21 November 19381939: 6 January 1939 to 25 December 19391940: 4 January 1940 to 22 December 19401941: 12 February 1941 to 22 November 19411942: 26 January 1942 to 22 December 19421943: 10 January 1943 to 28 December 19431944: 10 January 1944 to 3 December 19441945: 31 January 1945 to 29 December 19451946: 3 January 1946 to 21 December 19461947: 27 January 1947 to 28 December 19471948: 14 January 1948 to 16 November 19481949: 13 January 1949 to 28 November 19491950: 16 January 1950 to 23 December 19501951: 14 January 1951 to 20 December 19511952: 11 January 1952 to 10 December 19521953: 2 January 1953 to 28 November 19531954: 4 January 1954 to 21 December 19541955: 2 January 1955 to 26 December 19551956: 14 January 1956 to 13 November 19561957: 7 January 1957 to 1 November 19571958: 18 January 1958 to 21 September 19581959: 9 February 1959 to 1 December 19591960: 7 January 1960 to 13 December 19601961: 15 January 1961 to 26 November 19611962: 6 February 1962 to 17 September 19621963: 21 January 1963 to 25 December 19631964: 3 January 1964 to 31 December 19641965: 13 January 1965 to 27 December 19651966: 18 January 1966 to 25 November 19661967: 1 January 1967 to 9 October 19671968: 26 January 1968 to 18 December 19681969: 8 January 1969 to 25 December 19691970: 12 January 1970 to 19 September 19701971: 3 February 1971 to 14 December 19711972: 2 January 1972 to 26 December 19721973: 2 January 1973 to 18 December 19731974: 18 January 1974 to 17 December 19741934194019461952195819641970JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rio Formoso meeting 10 mm (0.39 in).
First to last qualifying date each year at Rio Formoso
YearFirst dateLast date
19341934-02-091934-12-23
19351935-01-061935-12-31
19361936-02-051936-08-07
19371937-02-071937-12-30
19381938-01-061938-11-21
19391939-01-061939-12-25
19401940-01-041940-12-22
19411941-02-121941-11-22
19421942-01-261942-12-22
19431943-01-101943-12-28
19441944-01-101944-12-03
19451945-01-311945-12-29
19461946-01-031946-12-21
19471947-01-271947-12-28
19481948-01-141948-11-16
19491949-01-131949-11-28
19501950-01-161950-12-23
19511951-01-141951-12-20
19521952-01-111952-12-10
19531953-01-021953-11-28
19541954-01-041954-12-21
19551955-01-021955-12-26
19561956-01-141956-11-13
19571957-01-071957-11-01
19581958-01-181958-09-21
19591959-02-091959-12-01
19601960-01-071960-12-13
19611961-01-151961-11-26
19621962-02-061962-09-17
19631963-01-211963-12-25
19641964-01-031964-12-31
19651965-01-131965-12-27
19661966-01-181966-11-25
19671967-01-011967-10-09
19681968-01-261968-12-18
19691969-01-081969-12-25
19701970-01-121970-09-19
19711971-02-031971-12-14
19721972-01-021972-12-26
19731973-01-021973-12-18
19741974-01-181974-12-17

Every Fixed Threshold

Fixed thresholds at Rio Formoso
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain41110196470
25 mm (0.98 in): Days with 25 mm or more rain4139193433
50 mm (1.97 in): Days with 50 mm or more rain4019197419
100 mm (3.94 in): Days with 100 mm or more rain10319353

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1934.

Download the Data

  • Data for Rio Formoso 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).