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Built 2026-10-19 (19 October 2026)

San Clemente Dam Threshold Days by Year (USC00047731)

4 fixed thresholds counted per year at San Clemente Dam (USC00047731): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Clemente Dam Thresholds

  • San Clemente Dam: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1941 with 39.
  • San Clemente Dam: days with 25 mm (0.98 in) or more of precipitation in 69 years, most in 1978 with 12.
  • San Clemente Dam: days with 50 mm (1.97 in) or more of precipitation in 43 years, most in 1995 with 5.
  • San Clemente Dam: days with 100 mm (3.94 in) or more of precipitation in 10 years, most in 1945 with 1.
  • 4 fixed thresholds have at least one qualifying day at San Clemente Dam.
72 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at San Clemente Dam Days per year at San Clemente Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 39 in 1941. 0102030401941: 391942: 191943: 151944: 211945: 201946: 111947: 81948: 151949: 111950: 241951: 181952: 231953: 81954: 181955: 241956: 61957: 151958: 261959: 91960: 171961: 81962: 131963: 161964: 191965: 201966: 111967: 231968: 151969: 251970: 201971: 101972: 101973: 271974: 161975: 141976: 101977: 81978: 271979: 181980: 211981: 211982: 221983: 341984: 81985: 141986: 211987: 101988: 71989: 81990: 101991: 201992: 151993: 231994: 131995: 241996: 241997: 161998: 301999: 122000: 222001: 242002: 102003: 112004: 162005: 232006: 242007: 82008: 162009: 182010: 212011: 152013: 1194119491957196519731981198919972005
Days per year at San Clemente Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 39 in 1941.
Days with 10 mm (0.39 in) or more of precipitation per year at San Clemente Dam
YearDaysDecade average
19413917.7
19421917.7
19431517.7
19442117.7
19452017.7
19461117.7
1947817.7
19481517.7
19491117.7
19502417.1
19511817.1
19522317.1
1953817.1
19541817.1
19552417.1
1956617.1
19571517.1
19582617.1
1959917.1
19601716.7
1961816.7
19621316.7
19631616.7
19641916.7
19652016.7
19661116.7
19672316.7
19681516.7
19692516.7
19702016
19711016
19721016
19732716
19741616
19751416
19761016
1977816
19782716
19791816
19802116.6
19812116.6
19822216.6
19833416.6
1984816.6
19851416.6
19862116.6
19871016.6
1988716.6
1989816.6
19901018.7
19912018.7
19921518.7
19932318.7
19941318.7
19952418.7
19962418.7
19971618.7
19983018.7
19991218.7
20002217.2
20012417.2
20021017.2
20031117.2
20041617.2
20052317.2
20062417.2
2007817.2
20081617.2
20091817.2
20102112.3
20111512.3
2013112.3
First to last qualifying date each year at San Clemente Dam For each year, a bar from the first to the last day at San Clemente Dam meeting 10 mm (0.39 in). 1941: 5 January 1941 to 29 December 19411942: 1 January 1942 to 25 December 19421943: 21 January 1943 to 30 December 19431944: 2 January 1944 to 28 December 19441945: 31 January 1945 to 27 December 19451946: 4 January 1946 to 26 December 19461947: 28 January 1947 to 21 December 19471948: 5 February 1948 to 27 December 19481949: 20 January 1949 to 14 December 19491950: 7 January 1950 to 26 December 19501951: 10 January 1951 to 31 December 19511952: 7 January 1952 to 31 December 19521953: 6 January 1953 to 4 December 19531954: 12 January 1954 to 10 December 19541955: 1 January 1955 to 31 December 19551956: 5 January 1956 to 31 October 19561957: 13 January 1957 to 18 December 19571958: 24 January 1958 to 15 November 19581959: 6 January 1959 to 19 September 19591960: 10 January 1960 to 26 November 19601961: 26 January 1961 to 2 December 19611962: 20 January 1962 to 17 December 19621963: 30 January 1963 to 24 November 19631964: 21 January 1964 to 31 December 19641965: 3 January 1965 to 31 December 19651966: 30 January 1966 to 7 December 19661967: 22 January 1967 to 19 December 19671968: 10 January 1968 to 26 December 19681969: 13 January 1969 to 25 December 19691970: 9 January 1970 to 27 December 19701971: 12 January 1971 to 27 December 19711972: 26 January 1972 to 16 November 19721973: 9 January 1973 to 27 December 19731974: 1 January 1974 to 28 December 19741975: 1 February 1975 to 30 October 19751976: 9 February 1976 to 31 December 19761977: 3 January 1977 to 23 December 19771978: 3 January 1978 to 19 December 19781979: 9 January 1979 to 30 December 19791980: 10 January 1980 to 4 December 19801981: 23 January 1981 to 30 December 19811982: 2 January 1982 to 23 December 19821983: 19 January 1983 to 25 December 19831984: 16 February 1984 to 16 December 19841985: 8 January 1985 to 2 December 19851986: 4 January 1986 to 18 November 19861987: 4 January 1987 to 30 December 19871988: 17 January 1988 to 28 December 19881989: 5 January 1989 to 26 November 19891990: 2 January 1990 to 20 December 19901991: 2 February 1991 to 30 December 19911992: 5 January 1992 to 30 December 19921993: 2 January 1993 to 12 December 19931994: 23 January 1994 to 24 December 19941995: 3 January 1995 to 14 December 19951996: 17 January 1996 to 30 December 19961997: 1 January 1997 to 14 December 19971998: 4 January 1998 to 1 December 19981999: 20 January 1999 to 8 November 19992000: 16 January 2000 to 30 October 20002001: 8 January 2001 to 31 December 20012002: 19 February 2002 to 31 December 20022003: 10 January 2003 to 30 December 20032004: 2 January 2004 to 31 December 20042005: 3 January 2005 to 31 December 20052006: 2 January 2006 to 27 December 20062007: 11 February 2007 to 7 December 20072008: 4 January 2008 to 25 December 20082009: 22 January 2009 to 13 December 20092010: 13 January 2010 to 29 December 20102011: 2 January 2011 to 21 November 20112013: 19 February 2013 to 19 February 201319411950195919681977198619952004JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Clemente Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at San Clemente Dam
YearFirst dateLast date
19411941-01-051941-12-29
19421942-01-011942-12-25
19431943-01-211943-12-30
19441944-01-021944-12-28
19451945-01-311945-12-27
19461946-01-041946-12-26
19471947-01-281947-12-21
19481948-02-051948-12-27
19491949-01-201949-12-14
19501950-01-071950-12-26
19511951-01-101951-12-31
19521952-01-071952-12-31
19531953-01-061953-12-04
19541954-01-121954-12-10
19551955-01-011955-12-31
19561956-01-051956-10-31
19571957-01-131957-12-18
19581958-01-241958-11-15
19591959-01-061959-09-19
19601960-01-101960-11-26
19611961-01-261961-12-02
19621962-01-201962-12-17
19631963-01-301963-11-24
19641964-01-211964-12-31
19651965-01-031965-12-31
19661966-01-301966-12-07
19671967-01-221967-12-19
19681968-01-101968-12-26
19691969-01-131969-12-25
19701970-01-091970-12-27
19711971-01-121971-12-27
19721972-01-261972-11-16
19731973-01-091973-12-27
19741974-01-011974-12-28
19751975-02-011975-10-30
19761976-02-091976-12-31
19771977-01-031977-12-23
19781978-01-031978-12-19
19791979-01-091979-12-30
19801980-01-101980-12-04
19811981-01-231981-12-30
19821982-01-021982-12-23
19831983-01-191983-12-25
19841984-02-161984-12-16
19851985-01-081985-12-02
19861986-01-041986-11-18
19871987-01-041987-12-30
19881988-01-171988-12-28
19891989-01-051989-11-26
19901990-01-021990-12-20
19911991-02-021991-12-30
19921992-01-051992-12-30
19931993-01-021993-12-12
19941994-01-231994-12-24
19951995-01-031995-12-14
19961996-01-171996-12-30
19971997-01-011997-12-14
19981998-01-041998-12-01
19991999-01-201999-11-08
20002000-01-162000-10-30
20012001-01-082001-12-31
20022002-02-192002-12-31
20032003-01-102003-12-30
20042004-01-022004-12-31
20052005-01-032005-12-31
20062006-01-022006-12-27
20072007-02-112007-12-07
20082008-01-042008-12-25
20092009-01-222009-12-13
20102010-01-132010-12-29
20112011-01-022011-11-21
20132013-02-192013-02-19

Every Fixed Threshold

Fixed thresholds at San Clemente Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain723919411
25 mm (0.98 in): Days with 25 mm or more rain691219786
50 mm (1.97 in): Days with 50 mm or more rain43519951
100 mm (3.94 in): Days with 100 mm or more rain10119451

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for San Clemente Dam 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).