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Built 2026-10-19 (19 October 2026)

Herval Threshold Days by Year (BR003253004)

4 fixed thresholds counted per year at Herval (BR003253004): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Herval Thresholds

  • Herval: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 1977 with 55.
  • Herval: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1984 with 28.
  • Herval: days with 50 mm (1.97 in) or more of precipitation in 31 years, most in 1987 with 12.
  • Herval: days with 100 mm (3.94 in) or more of precipitation in 12 years, most in 1974 with 2.
  • 4 fixed thresholds have at least one qualifying day at Herval.
31 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Herval Days per year at Herval with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1977. 02040601969: 411970: 391971: 381972: 491973: 521974: 471975: 431976: 541977: 551978: 431979: 421980: 521981: 451982: 421983: 451984: 541985: 431986: 441987: 511988: 311989: 241990: 431991: 401992: 481993: 441994: 391995: 431996: 371997: 491998: 431999: 4219691973197719811985198919931997
Days per year at Herval with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1977.
Days with 10 mm (0.39 in) or more of precipitation per year at Herval
YearDaysDecade average
19694141
19703946.2
19713846.2
19724946.2
19735246.2
19744746.2
19754346.2
19765446.2
19775546.2
19784346.2
19794246.2
19805243.1
19814543.1
19824243.1
19834543.1
19845443.1
19854343.1
19864443.1
19875143.1
19883143.1
19892443.1
19904342.8
19914042.8
19924842.8
19934442.8
19943942.8
19954342.8
19963742.8
19974942.8
19984342.8
19994242.8
First to last qualifying date each year at Herval For each year, a bar from the first to the last day at Herval meeting 10 mm (0.39 in). 1969: 5 January 1969 to 12 December 19691970: 6 January 1970 to 28 December 19701971: 5 January 1971 to 17 December 19711972: 3 January 1972 to 30 December 19721973: 7 January 1973 to 30 December 19731974: 3 January 1974 to 23 December 19741975: 7 January 1975 to 20 December 19751976: 6 January 1976 to 16 December 19761977: 1 January 1977 to 22 November 19771978: 14 January 1978 to 31 December 19781979: 25 January 1979 to 13 December 19791980: 7 January 1980 to 19 December 19801981: 12 January 1981 to 31 December 19811982: 10 January 1982 to 15 December 19821983: 15 January 1983 to 21 December 19831984: 1 January 1984 to 6 December 19841985: 6 January 1985 to 26 December 19851986: 17 January 1986 to 21 December 19861987: 6 January 1987 to 18 December 19871988: 1 January 1988 to 22 November 19881989: 8 January 1989 to 18 December 19891990: 1 February 1990 to 11 December 19901991: 30 January 1991 to 23 December 19911992: 2 January 1992 to 18 December 19921993: 1 January 1993 to 28 December 19931994: 8 January 1994 to 14 December 19941995: 5 January 1995 to 24 December 19951996: 5 January 1996 to 18 December 19961997: 19 January 1997 to 30 December 19971998: 2 January 1998 to 28 December 19981999: 20 January 1999 to 14 December 199919691973197719811985198919931997JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Herval meeting 10 mm (0.39 in).
First to last qualifying date each year at Herval
YearFirst dateLast date
19691969-01-051969-12-12
19701970-01-061970-12-28
19711971-01-051971-12-17
19721972-01-031972-12-30
19731973-01-071973-12-30
19741974-01-031974-12-23
19751975-01-071975-12-20
19761976-01-061976-12-16
19771977-01-011977-11-22
19781978-01-141978-12-31
19791979-01-251979-12-13
19801980-01-071980-12-19
19811981-01-121981-12-31
19821982-01-101982-12-15
19831983-01-151983-12-21
19841984-01-011984-12-06
19851985-01-061985-12-26
19861986-01-171986-12-21
19871987-01-061987-12-18
19881988-01-011988-11-22
19891989-01-081989-12-18
19901990-02-011990-12-11
19911991-01-301991-12-23
19921992-01-021992-12-18
19931993-01-011993-12-28
19941994-01-081994-12-14
19951995-01-051995-12-24
19961996-01-051996-12-18
19971997-01-191997-12-30
19981998-01-021998-12-28
19991999-01-201999-12-14

Every Fixed Threshold

Fixed thresholds at Herval
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3155197742
25 mm (0.98 in): Days with 25 mm or more rain3128198414
50 mm (1.97 in): Days with 50 mm or more rain311219872
100 mm (3.94 in): Days with 100 mm or more rain12219741

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 Herval 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).