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Built 2026-10-17 (17 October 2026)

Mount Sylvia Threshold Days by Year

5 fixed thresholds counted per year at Mount Sylvia (ASN00040384): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mount Sylvia Thresholds

  • Mount Sylvia: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1983 with 41.
  • Mount Sylvia: days with 25 mm (0.98 in) or more of precipitation in 42 years, most in 1967 with 19.
  • Mount Sylvia: days with 50 mm (1.97 in) or more of precipitation in 31 years, most in 1955 with 5.
  • Mount Sylvia: days with 100 mm (3.94 in) or more of precipitation in 9 years, most in 1954 with 1.
  • 5 fixed thresholds have at least one qualifying day at Mount Sylvia.
42 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Mount Sylvia Days per year at Mount Sylvia with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1983. 02040601954: 271955: 321956: 291957: 151958: 191959: 261960: 201961: 251962: 261963: 271964: 231967: 301968: 231969: 231970: 191971: 321972: 221973: 241974: 241975: 371976: 261977: 151978: 241979: 231980: 151981: 311982: 311983: 411984: 201985: 241986: 241987: 221988: 301989: 271990: 221991: 211992: 281995: 321996: 301997: 211999: 222000: 9195419591964197119761981198619911999
Days per year at Mount Sylvia with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1983.
Days with 10 mm (0.39 in) or more of precipitation per year at Mount Sylvia
YearDaysDecade average
19542724.7
19553224.7
19562924.7
19571524.7
19581924.7
19592624.7
19602024.6
19612524.6
19622624.6
19632724.6
19642324.6
19673024.6
19682324.6
19692324.6
19701924.6
19713224.6
19722224.6
19732424.6
19742424.6
19753724.6
19762624.6
19771524.6
19782424.6
19792324.6
19801526.5
19813126.5
19823126.5
19834126.5
19842026.5
19852426.5
19862426.5
19872226.5
19883026.5
19892726.5
19902225.1
19912125.1
19922825.1
19953225.1
19963025.1
19972125.1
19992225.1
200099
First to last qualifying date each year at Mount Sylvia For each year, a bar from the first to the last day at Mount Sylvia meeting 10 mm (0.39 in). 1954: 3 January 1954 to 18 December 19541955: 10 January 1955 to 31 December 19551956: 1 January 1956 to 22 December 19561957: 9 January 1957 to 17 December 19571958: 1 February 1958 to 29 December 19581959: 3 January 1959 to 21 December 19591960: 6 February 1960 to 12 December 19601961: 4 January 1961 to 12 December 19611962: 2 January 1962 to 31 December 19621963: 1 January 1963 to 16 December 19631964: 1 January 1964 to 27 December 19641967: 2 January 1967 to 26 November 19671968: 6 January 1968 to 5 December 19681969: 2 January 1969 to 31 December 19691970: 2 January 1970 to 18 November 19701971: 18 January 1971 to 30 November 19711972: 15 January 1972 to 29 December 19721973: 13 January 1973 to 27 December 19731974: 4 January 1974 to 29 December 19741975: 5 January 1975 to 24 December 19751976: 10 January 1976 to 25 December 19761977: 3 January 1977 to 4 November 19771978: 6 January 1978 to 27 December 19781979: 16 January 1979 to 16 December 19791980: 28 January 1980 to 30 December 19801981: 1 January 1981 to 30 December 19811982: 6 January 1982 to 21 December 19821983: 1 January 1983 to 31 December 19831984: 28 January 1984 to 15 December 19841985: 1 January 1985 to 16 December 19851986: 10 January 1986 to 28 December 19861987: 4 January 1987 to 11 December 19871988: 19 January 1988 to 28 December 19881989: 6 January 1989 to 25 December 19891990: 14 January 1990 to 23 December 19901991: 1 January 1991 to 31 December 19911992: 1 January 1992 to 15 December 19921995: 19 January 1995 to 24 December 19951996: 3 January 1996 to 31 December 19961997: 31 January 1997 to 25 December 19971999: 10 January 1999 to 27 December 19992000: 4 January 2000 to 29 December 20001954196019681974198019861992JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mount Sylvia meeting 10 mm (0.39 in).
First to last qualifying date each year at Mount Sylvia
YearFirst dateLast date
19541954-01-031954-12-18
19551955-01-101955-12-31
19561956-01-011956-12-22
19571957-01-091957-12-17
19581958-02-011958-12-29
19591959-01-031959-12-21
19601960-02-061960-12-12
19611961-01-041961-12-12
19621962-01-021962-12-31
19631963-01-011963-12-16
19641964-01-011964-12-27
19671967-01-021967-11-26
19681968-01-061968-12-05
19691969-01-021969-12-31
19701970-01-021970-11-18
19711971-01-181971-11-30
19721972-01-151972-12-29
19731973-01-131973-12-27
19741974-01-041974-12-29
19751975-01-051975-12-24
19761976-01-101976-12-25
19771977-01-031977-11-04
19781978-01-061978-12-27
19791979-01-161979-12-16
19801980-01-281980-12-30
19811981-01-011981-12-30
19821982-01-061982-12-21
19831983-01-011983-12-31
19841984-01-281984-12-15
19851985-01-011985-12-16
19861986-01-101986-12-28
19871987-01-041987-12-11
19881988-01-191988-12-28
19891989-01-061989-12-25
19901990-01-141990-12-23
19911991-01-011991-12-31
19921992-01-011992-12-15
19951995-01-191995-12-24
19961996-01-031996-12-31
19971997-01-311997-12-25
19991999-01-101999-12-27
20002000-01-042000-12-29

Every Fixed Threshold

Fixed thresholds at Mount Sylvia
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain424119839
25 mm (0.98 in): Days with 25 mm or more rain421919672
50 mm (1.97 in): Days with 50 mm or more rain31519552
100 mm (3.94 in): Days with 100 mm or more rain9119541
200 mm (7.87 in): Days with 200 mm or more rain1119921

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

  • Data for Mount Sylvia 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).