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Built 2026-10-19 (19 October 2026)

U C L A Threshold Days by Year (USC00049152)

13 fixed thresholds counted per year at U C L A (USC00049152): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for U C L A Thresholds

  • U C L A: days with a maximum temperature at or above 30 C (86 F) in 89 years, most in 2015 with 43.
  • U C L A: days with a maximum temperature at or above 90 F (32.2 C) in 88 years, most in 2020 with 23.
  • U C L A: nights with a minimum temperature at or above 20 C (68 F) in 85 years, most in 2015 with 44.
  • U C L A: days with 10 mm (0.39 in) or more of precipitation in 83 years, most in 1983 with 34.
  • 13 fixed thresholds have at least one qualifying day at U C L A.
89 years with a qualifying day
Days at or above 30 C (86 F) per year at U C L A Days per year at U C L A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 2015. 02040601934: 291935: 221937: 261938: 281939: 371940: 251942: 231943: 301944: 141946: 101947: 181948: 91949: 251950: 121951: 81952: 141953: 141954: 201955: 161956: 211957: 171958: 351959: 201960: 131961: 81962: 51963: 101964: 111965: 151966: 61967: 151968: 251969: 171970: 291971: 401972: 231973: 161974: 81975: 91976: 251977: 91979: 231980: 181981: 181982: 141983: 321984: 261985: 221986: 81987: 131988: 141989: 191990: 281991: 151992: 181993: 121994: 191995: 231996: 161997: 331998: 191999: 172000: 132001: 62002: 122003: 222004: 202005: 212006: 302007: 312008: 362009: 302010: 202011: 162012: 262013: 192014: 332015: 432016: 342017: 312018: 202019: 252020: 412021: 262022: 292023: 142024: 92025: 122026: 321934194619551964197319831992200120102019
Days per year at U C L A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 2015.
Days at or above 30 C (86 F) per year at U C L A
YearDaysDecade average
19342928.4
19352228.4
19372628.4
19382828.4
19393728.4
19402519.3
19422319.3
19433019.3
19441419.3
19461019.3
19471819.3
1948919.3
19492519.3
19501217.7
1951817.7
19521417.7
19531417.7
19542017.7
19551617.7
19562117.7
19571717.7
19583517.7
19592017.7
19601312.5
1961812.5
1962512.5
19631012.5
19641112.5
19651512.5
1966612.5
19671512.5
19682512.5
19691712.5
19702920.2
19714020.2
19722320.2
19731620.2
1974820.2
1975920.2
19762520.2
1977920.2
19792320.2
19801818.4
19811818.4
19821418.4
19833218.4
19842618.4
19852218.4
1986818.4
19871318.4
19881418.4
19891918.4
19902820
19911520
19921820
19931220
19941920
19952320
19961620
19973320
19981920
19991720
20001322.1
2001622.1
20021222.1
20032222.1
20042022.1
20052122.1
20063022.1
20073122.1
20083622.1
20093022.1
20102026.7
20111626.7
20122626.7
20131926.7
20143326.7
20154326.7
20163426.7
20173126.7
20182026.7
20192526.7
20204123.3
20212623.3
20222923.3
20231423.3
2024923.3
20251223.3
20263223.3
First to last qualifying date each year at U C L A For each year, a bar from the first to the last day at U C L A meeting 30 C (86 F). 1934: 8 March 1934 to 5 November 19341935: 4 May 1935 to 27 October 19351937: 1 July 1937 to 12 October 19371938: 18 April 1938 to 8 December 19381939: 6 April 1939 to 24 November 19391940: 11 April 1940 to 2 December 19401942: 19 May 1942 to 12 November 19421943: 9 May 1943 to 5 October 19431944: 18 January 1944 to 24 September 19441946: 1 March 1946 to 25 October 19461947: 25 March 1947 to 26 September 19471948: 15 April 1948 to 8 October 19481949: 22 June 1949 to 18 November 19491950: 29 March 1950 to 10 December 19501951: 18 September 1951 to 6 November 19511952: 27 July 1952 to 4 November 19521953: 5 May 1953 to 25 November 19531954: 1 February 1954 to 22 November 19541955: 7 March 1955 to 29 October 19551956: 15 May 1956 to 26 November 19561957: 12 February 1957 to 9 December 19571958: 14 April 1958 to 11 December 19581959: 11 March 1959 to 30 November 19591960: 3 April 1960 to 17 October 19601961: 3 April 1961 to 16 October 19611962: 6 April 1962 to 31 October 19621963: 8 September 1963 to 29 September 19631964: 14 April 1964 to 30 November 19641965: 8 August 1965 to 29 October 19651966: 15 April 1966 to 3 November 19661967: 15 May 1967 to 18 October 19671968: 4 March 1968 to 25 October 19681969: 30 June 1969 to 7 October 19691970: 3 May 1970 to 29 October 19701971: 17 January 1971 to 11 October 19711972: 4 March 1972 to 7 October 19721973: 28 May 1973 to 28 October 19731974: 19 July 1974 to 12 November 19741975: 19 January 1975 to 4 October 19751976: 16 January 1976 to 16 November 19761977: 26 July 1977 to 29 November 19771979: 12 May 1979 to 6 December 19791980: 26 February 1980 to 30 December 19801981: 28 April 1981 to 2 November 19811982: 6 August 1982 to 24 October 19821983: 10 July 1983 to 3 November 19831984: 3 May 1984 to 29 September 19841985: 13 February 1985 to 15 October 19851986: 24 February 1986 to 3 November 19861987: 21 April 1987 to 27 October 19871988: 10 February 1988 to 10 October 19881989: 1 April 1989 to 20 November 19891990: 5 May 1990 to 12 November 19901991: 5 May 1991 to 6 November 19911992: 6 July 1992 to 23 October 19921993: 9 May 1993 to 2 November 19931994: 13 March 1994 to 11 October 19941995: 2 February 1995 to 5 October 19951996: 5 April 1996 to 10 November 19961997: 10 March 1997 to 3 November 19971998: 16 July 1998 to 6 October 19981999: 16 April 1999 to 31 October 19992000: 25 June 2000 to 17 October 20002001: 24 April 2001 to 1 October 20012002: 21 February 2002 to 21 November 20022003: 31 January 2003 to 27 October 20032004: 8 March 2004 to 11 December 20042005: 19 January 2005 to 20 November 20052006: 13 February 2006 to 20 November 20062007: 9 January 2007 to 15 November 20072008: 23 March 2008 to 21 November 20082009: 12 January 2009 to 1 November 20092010: 16 March 2010 to 12 December 20102011: 17 January 2011 to 29 November 20112012: 4 January 2012 to 5 November 20122013: 3 May 2013 to 14 November 20132014: 17 January 2014 to 27 November 20142015: 13 February 2015 to 22 November 20152016: 8 February 2016 to 14 November 20162017: 22 April 2017 to 23 November 20172018: 29 January 2018 to 2 November 20182019: 10 June 2019 to 18 November 20192020: 28 February 2020 to 16 November 20202021: 15 January 2021 to 21 November 20212022: 10 February 2022 to 20 October 20222023: 23 July 2023 to 1 November 20232024: 20 August 2024 to 10 September 20242025: 10 May 2025 to 30 October 20252026: 4 February 2026 to 6 October 202619341949196119731986199820102022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at U C L A meeting 30 C (86 F).
First to last qualifying date each year at U C L A
YearFirst dateLast date
19341934-03-081934-11-05
19351935-05-041935-10-27
19371937-07-011937-10-12
19381938-04-181938-12-08
19391939-04-061939-11-24
19401940-04-111940-12-02
19421942-05-191942-11-12
19431943-05-091943-10-05
19441944-01-181944-09-24
19461946-03-011946-10-25
19471947-03-251947-09-26
19481948-04-151948-10-08
19491949-06-221949-11-18
19501950-03-291950-12-10
19511951-09-181951-11-06
19521952-07-271952-11-04
19531953-05-051953-11-25
19541954-02-011954-11-22
19551955-03-071955-10-29
19561956-05-151956-11-26
19571957-02-121957-12-09
19581958-04-141958-12-11
19591959-03-111959-11-30
19601960-04-031960-10-17
19611961-04-031961-10-16
19621962-04-061962-10-31
19631963-09-081963-09-29
19641964-04-141964-11-30
19651965-08-081965-10-29
19661966-04-151966-11-03
19671967-05-151967-10-18
19681968-03-041968-10-25
19691969-06-301969-10-07
19701970-05-031970-10-29
19711971-01-171971-10-11
19721972-03-041972-10-07
19731973-05-281973-10-28
19741974-07-191974-11-12
19751975-01-191975-10-04
19761976-01-161976-11-16
19771977-07-261977-11-29
19791979-05-121979-12-06
19801980-02-261980-12-30
19811981-04-281981-11-02
19821982-08-061982-10-24
19831983-07-101983-11-03
19841984-05-031984-09-29
19851985-02-131985-10-15
19861986-02-241986-11-03
19871987-04-211987-10-27
19881988-02-101988-10-10
19891989-04-011989-11-20
19901990-05-051990-11-12
19911991-05-051991-11-06
19921992-07-061992-10-23
19931993-05-091993-11-02
19941994-03-131994-10-11
19951995-02-021995-10-05
19961996-04-051996-11-10
19971997-03-101997-11-03
19981998-07-161998-10-06
19991999-04-161999-10-31
20002000-06-252000-10-17
20012001-04-242001-10-01
20022002-02-212002-11-21
20032003-01-312003-10-27
20042004-03-082004-12-11
20052005-01-192005-11-20
20062006-02-132006-11-20
20072007-01-092007-11-15
20082008-03-232008-11-21
20092009-01-122009-11-01
20102010-03-162010-12-12
20112011-01-172011-11-29
20122012-01-042012-11-05
20132013-05-032013-11-14
20142014-01-172014-11-27
20152015-02-132015-11-22
20162016-02-082016-11-14
20172017-04-222017-11-23
20182018-01-292018-11-02
20192019-06-102019-11-18
20202020-02-282020-11-16
20212021-01-152021-11-21
20222022-02-102022-10-20
20232023-07-232023-11-01
20242024-08-202024-09-10
20252025-05-102025-10-30
20262026-02-042026-10-06

Every Fixed Threshold

Fixed thresholds at U C L A
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days8943201532
35 C (95 F): Days611219396
40 C (104 F): Days8419391
90 F (32.2 C): Days8823202011
100 F (37.8 C): Days25619392
0 C (32 F): Frost days (min3319372
20 C (68 F): Tropical nights (min8544201530
25 C (77 F): Days with min26519635
10 mm (0.39 in): Days with 10 mm or more rain833419837
25 mm (0.98 in): Days with 25 mm or more rain791620232
50 mm (1.97 in): Days with 50 mm or more rain57719981
100 mm (3.94 in): Days with 100 mm or more rain18219691
200 mm (7.87 in): Days with 200 mm or more rain1120241

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1934.

Download the Data

  • Data for U C L A 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 (2026-10-17).