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

Rio Negro Threshold Days by Year (BR001954003)

4 fixed thresholds counted per year at Rio Negro (BR001954003): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rio Negro Thresholds

  • Rio Negro: days with 10 mm (0.39 in) or more of precipitation in 19 years, most in 1976 with 66.
  • Rio Negro: days with 25 mm (0.98 in) or more of precipitation in 19 years, most in 1982 with 27.
  • Rio Negro: days with 50 mm (1.97 in) or more of precipitation in 19 years, most in 1971 with 8.
  • Rio Negro: days with 100 mm (3.94 in) or more of precipitation in 3 years, most in 1993 with 2.
  • 4 fixed thresholds have at least one qualifying day at Rio Negro.
19 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rio Negro Days per year at Rio Negro with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 66 in 1976. 0204060801969: 361970: 351971: 381972: 521976: 661977: 491979: 591980: 491981: 501982: 571983: 491992: 451993: 401994: 531995: 341996: 471997: 401998: 381999: 241969197119761979198119831993199519971999
Days per year at Rio Negro with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 66 in 1976.
Days with 10 mm (0.39 in) or more of precipitation per year at Rio Negro
YearDaysDecade average
19693636
19703549.8
19713849.8
19725249.8
19766649.8
19774949.8
19795949.8
19804951.3
19815051.3
19825751.3
19834951.3
19924540.1
19934040.1
19945340.1
19953440.1
19964740.1
19974040.1
19983840.1
19992440.1
First to last qualifying date each year at Rio Negro For each year, a bar from the first to the last day at Rio Negro meeting 10 mm (0.39 in). 1969: 1 January 1969 to 22 December 19691970: 14 January 1970 to 26 December 19701971: 5 January 1971 to 18 December 19711972: 7 January 1972 to 22 December 19721976: 1 January 1976 to 29 December 19761977: 2 January 1977 to 31 December 19771979: 1 January 1979 to 31 December 19791980: 17 January 1980 to 26 December 19801981: 3 January 1981 to 27 December 19811982: 2 January 1982 to 28 December 19821983: 2 January 1983 to 29 December 19831992: 1 January 1992 to 27 December 19921993: 8 January 1993 to 30 December 19931994: 2 January 1994 to 30 December 19941995: 3 January 1995 to 13 December 19951996: 2 January 1996 to 31 December 19961997: 2 January 1997 to 15 December 19971998: 3 January 1998 to 4 December 19981999: 10 January 1999 to 28 December 19991969197219791982199319961999JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rio Negro meeting 10 mm (0.39 in).
First to last qualifying date each year at Rio Negro
YearFirst dateLast date
19691969-01-011969-12-22
19701970-01-141970-12-26
19711971-01-051971-12-18
19721972-01-071972-12-22
19761976-01-011976-12-29
19771977-01-021977-12-31
19791979-01-011979-12-31
19801980-01-171980-12-26
19811981-01-031981-12-27
19821982-01-021982-12-28
19831983-01-021983-12-29
19921992-01-011992-12-27
19931993-01-081993-12-30
19941994-01-021994-12-30
19951995-01-031995-12-13
19961996-01-021996-12-31
19971997-01-021997-12-15
19981998-01-031998-12-04
19991999-01-101999-12-28

Every Fixed Threshold

Fixed thresholds at Rio Negro
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1966197624
25 mm (0.98 in): Days with 25 mm or more rain192719825
50 mm (1.97 in): Days with 50 mm or more rain19819712
100 mm (3.94 in): Days with 100 mm or more rain3219931

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1969.

Download the Data

  • Data for Rio Negro 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).