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Built 2026-10-17 (17 October 2026)

Ross (Mount Morriston) Threshold Days by Year

3 fixed thresholds counted per year at Ross (Mount Morriston) (ASN00093041): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ross (Mount Morriston) Thresholds

  • Ross (Mount Morriston): days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1970 with 24.
  • Ross (Mount Morriston): days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1960 with 6.
  • Ross (Mount Morriston): days with 50 mm (1.97 in) or more of precipitation in 8 years, most in 1960 with 2.
  • 3 fixed thresholds have at least one qualifying day at Ross (Mount Morriston).
47 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ross (Mount Morriston) Days per year at Ross (Mount Morriston) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 24 in 1970. 01020301960: 141961: 41962: 91963: 71964: 161965: 191966: 191967: 101968: 161969: 161970: 241971: 131973: 171974: 201975: 191976: 121977: 141978: 181979: 91980: 101981: 131982: 61983: 121984: 141985: 161986: 161987: 61988: 121989: 151990: 211991: 111992: 121993: 151994: 71995: 161996: 141997: 121998: 131999: 142000: 92001: 182002: 42003: 112004: 112005: 132006: 112007: 41960196519701976198119861991199620012006
Days per year at Ross (Mount Morriston) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 24 in 1970.
Days with 10 mm (0.39 in) or more of precipitation per year at Ross (Mount Morriston)
YearDaysDecade average
19601413
1961413
1962913
1963713
19641613
19651913
19661913
19671013
19681613
19691613
19702416.2
19711316.2
19731716.2
19742016.2
19751916.2
19761216.2
19771416.2
19781816.2
1979916.2
19801012
19811312
1982612
19831212
19841412
19851612
19861612
1987612
19881212
19891512
19902113.5
19911113.5
19921213.5
19931513.5
1994713.5
19951613.5
19961413.5
19971213.5
19981313.5
19991413.5
2000910.1
20011810.1
2002410.1
20031110.1
20041110.1
20051310.1
20061110.1
2007410.1
First to last qualifying date each year at Ross (Mount Morriston) For each year, a bar from the first to the last day at Ross (Mount Morriston) meeting 10 mm (0.39 in). 1960: 8 January 1960 to 4 November 19601961: 2 March 1961 to 4 July 19611962: 20 February 1962 to 9 December 19621963: 6 January 1963 to 29 October 19631964: 7 February 1964 to 26 December 19641965: 11 January 1965 to 24 December 19651966: 16 January 1966 to 18 December 19661967: 1 July 1967 to 18 December 19671968: 21 January 1968 to 30 December 19681969: 14 January 1969 to 29 December 19691970: 1 January 1970 to 31 December 19701971: 16 January 1971 to 6 November 19711973: 13 January 1973 to 30 December 19731974: 17 January 1974 to 28 December 19741975: 10 January 1975 to 24 November 19751976: 9 January 1976 to 24 December 19761977: 2 January 1977 to 30 November 19771978: 5 February 1978 to 27 December 19781979: 17 January 1979 to 16 December 19791980: 21 February 1980 to 29 December 19801981: 19 January 1981 to 11 November 19811982: 7 January 1982 to 9 December 19821983: 2 January 1983 to 17 November 19831984: 14 March 1984 to 26 December 19841985: 31 January 1985 to 18 December 19851986: 9 January 1986 to 31 December 19861987: 25 May 1987 to 6 December 19871988: 24 January 1988 to 29 November 19881989: 5 January 1989 to 14 December 19891990: 4 January 1990 to 28 December 19901991: 25 January 1991 to 28 December 19911992: 4 January 1992 to 22 November 19921993: 25 January 1993 to 28 December 19931994: 28 February 1994 to 21 November 19941995: 6 January 1995 to 20 December 19951996: 1 January 1996 to 12 October 19961997: 22 January 1997 to 2 December 19971998: 14 January 1998 to 27 December 19981999: 7 February 1999 to 4 December 19992000: 5 January 2000 to 12 November 20002001: 6 January 2001 to 21 December 20012002: 7 January 2002 to 23 October 20022003: 31 January 2003 to 22 December 20032004: 18 January 2004 to 1 December 20042005: 5 January 2005 to 4 December 20052006: 31 January 2006 to 25 December 20062007: 6 January 2007 to 22 December 200719601966197319791985199119972003JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ross (Mount Morriston) meeting 10 mm (0.39 in).
First to last qualifying date each year at Ross (Mount Morriston)
YearFirst dateLast date
19601960-01-081960-11-04
19611961-03-021961-07-04
19621962-02-201962-12-09
19631963-01-061963-10-29
19641964-02-071964-12-26
19651965-01-111965-12-24
19661966-01-161966-12-18
19671967-07-011967-12-18
19681968-01-211968-12-30
19691969-01-141969-12-29
19701970-01-011970-12-31
19711971-01-161971-11-06
19731973-01-131973-12-30
19741974-01-171974-12-28
19751975-01-101975-11-24
19761976-01-091976-12-24
19771977-01-021977-11-30
19781978-02-051978-12-27
19791979-01-171979-12-16
19801980-02-211980-12-29
19811981-01-191981-11-11
19821982-01-071982-12-09
19831983-01-021983-11-17
19841984-03-141984-12-26
19851985-01-311985-12-18
19861986-01-091986-12-31
19871987-05-251987-12-06
19881988-01-241988-11-29
19891989-01-051989-12-14
19901990-01-041990-12-28
19911991-01-251991-12-28
19921992-01-041992-11-22
19931993-01-251993-12-28
19941994-02-281994-11-21
19951995-01-061995-12-20
19961996-01-011996-10-12
19971997-01-221997-12-02
19981998-01-141998-12-27
19991999-02-071999-12-04
20002000-01-052000-11-12
20012001-01-062001-12-21
20022002-01-072002-10-23
20032003-01-312003-12-22
20042004-01-182004-12-01
20052005-01-052005-12-04
20062006-01-312006-12-25
20072007-01-062007-12-22

Every Fixed Threshold

Fixed thresholds at Ross (Mount Morriston)
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain472419704
25 mm (0.98 in): Days with 25 mm or more rain41619601
50 mm (1.97 in): Days with 50 mm or more rain8219601

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1960.

Download the Data

  • Data for Ross (Mount Morriston) 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

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