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Built 2026-10-19 (19 October 2026)

Imperial Threshold Days by Year (USC00044223)

15 fixed thresholds counted per year at Imperial (USC00044223): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Imperial Thresholds

  • Imperial: days with a maximum temperature at or above 30 C (86 F) in 101 years, most in 1904 with 242.
  • Imperial: days with a maximum temperature at or above 35 C (95 F) in 101 years, most in 1902 with 176.
  • Imperial: days with a maximum temperature at or above 40 C (104 F) in 101 years, most in 2024 with 123.
  • Imperial: days with a maximum temperature at or above 90 F (32.2 C) in 101 years, most in 1934 with 219.
  • 15 fixed thresholds have at least one qualifying day at Imperial.
101 years with a qualifying day
Days at or above 30 C (86 F) per year at Imperial Days per year at Imperial with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 242 in 1904. 01002003001902: 2131903: 2181904: 2421905: 1921906: 2101926: 2101927: 1991928: 2101929: 1761930: 2041931: 2131933: 1981934: 2401935: 1861936: 2121937: 2061938: 1901939: 2091940: 2091941: 1791942: 1901943: 2011944: 1891945: 1981946: 1891947: 1901948: 1871949: 2071950: 2201951: 1901952: 2061953: 1881954: 2181955: 1941956: 2061957: 1791958: 2041959: 2081960: 2041961: 1851962: 2041963: 1921964: 1881965: 1891966: 2091967: 1861968: 2041969: 1851970: 1891971: 1871972: 2081973: 1951974: 1971975: 1771976: 1911977: 2071978: 1951979: 1891980: 1851981: 2081982: 1811983: 1871984: 1851985: 1941986: 2081987: 1991988: 2041989: 2201990: 2071991: 1871992: 1981993: 2151994: 1991995: 1981996: 2021997: 2051998: 1741999: 1962000: 1922001: 2202002: 1992003: 1982004: 2082005: 1972006: 2022007: 2222008: 2172010: 1542011: 2012012: 2092013: 2192014: 2272015: 2182018: 1892019: 1622021: 2312022: 2242023: 1972024: 2002025: 2292026: 1791902193319441955196619771988199920112025
Days per year at Imperial with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 242 in 1904.
Days at or above 30 C (86 F) per year at Imperial
YearDaysDecade average
1902213215
1903218215
1904242215
1905192215
1906210215
1926210198.8
1927199198.8
1928210198.8
1929176198.8
1930204206.4
1931213206.4
1933198206.4
1934240206.4
1935186206.4
1936212206.4
1937206206.4
1938190206.4
1939209206.4
1940209193.9
1941179193.9
1942190193.9
1943201193.9
1944189193.9
1945198193.9
1946189193.9
1947190193.9
1948187193.9
1949207193.9
1950220201.3
1951190201.3
1952206201.3
1953188201.3
1954218201.3
1955194201.3
1956206201.3
1957179201.3
1958204201.3
1959208201.3
1960204194.6
1961185194.6
1962204194.6
1963192194.6
1964188194.6
1965189194.6
1966209194.6
1967186194.6
1968204194.6
1969185194.6
1970189193.5
1971187193.5
1972208193.5
1973195193.5
1974197193.5
1975177193.5
1976191193.5
1977207193.5
1978195193.5
1979189193.5
1980185197.1
1981208197.1
1982181197.1
1983187197.1
1984185197.1
1985194197.1
1986208197.1
1987199197.1
1988204197.1
1989220197.1
1990207198.1
1991187198.1
1992198198.1
1993215198.1
1994199198.1
1995198198.1
1996202198.1
1997205198.1
1998174198.1
1999196198.1
2000192206.1
2001220206.1
2002199206.1
2003198206.1
2004208206.1
2005197206.1
2006202206.1
2007222206.1
2008217206.1
2010154197.4
2011201197.4
2012209197.4
2013219197.4
2014227197.4
2015218197.4
2018189197.4
2019162197.4
2021231210
2022224210
2023197210
2024200210
2025229210
2026179210
First to last qualifying date each year at Imperial For each year, a bar from the first to the last day at Imperial meeting 30 C (86 F). 1902: 16 February 1902 to 4 November 19021903: 21 February 1903 to 29 October 19031904: 14 February 1904 to 30 November 19041905: 24 March 1905 to 15 November 19051906: 26 January 1906 to 15 November 19061926: 9 February 1926 to 8 November 19261927: 26 February 1927 to 9 November 19271928: 12 January 1928 to 12 November 19281929: 23 February 1929 to 19 November 19291930: 14 February 1930 to 12 November 19301931: 4 March 1931 to 6 November 19311933: 7 March 1933 to 25 November 19331934: 1 March 1934 to 14 November 19341935: 14 March 1935 to 28 October 19351936: 1 March 1936 to 18 November 19361937: 2 March 1937 to 5 November 19371938: 20 March 1938 to 8 December 19381939: 15 March 1939 to 7 November 19391940: 8 March 1940 to 2 November 19401941: 23 March 1941 to 16 November 19411942: 29 March 1942 to 13 November 19421943: 25 March 1943 to 14 November 19431944: 10 March 1944 to 31 October 19441945: 12 March 1945 to 4 November 19451946: 24 February 1946 to 26 October 19461947: 14 March 1947 to 1 November 19471948: 8 April 1948 to 3 November 19481949: 9 April 1949 to 1 December 19491950: 4 March 1950 to 28 November 19501951: 9 February 1951 to 24 October 19511952: 26 March 1952 to 6 November 19521953: 29 January 1953 to 25 November 19531954: 7 February 1954 to 27 November 19541955: 14 March 1955 to 10 November 19551956: 18 March 1956 to 13 November 19561957: 12 February 1957 to 27 October 19571958: 10 April 1958 to 11 December 19581959: 2 March 1959 to 25 November 19591960: 6 March 1960 to 1 November 19601961: 14 March 1961 to 26 October 19611962: 7 January 1962 to 21 November 19621963: 3 February 1963 to 12 November 19631964: 18 March 1964 to 1 November 19641965: 22 February 1965 to 7 November 19651966: 11 March 1966 to 3 November 19661967: 16 March 1967 to 16 November 19671968: 20 February 1968 to 22 November 19681969: 27 March 1969 to 4 November 19691970: 14 March 1970 to 2 November 19701971: 18 January 1971 to 4 November 19711972: 27 February 1972 to 24 October 19721973: 6 April 1973 to 12 November 19731974: 14 March 1974 to 14 November 19741975: 3 March 1975 to 10 November 19751976: 17 January 1976 to 9 November 19761977: 13 February 1977 to 26 November 19771978: 17 March 1978 to 9 November 19781979: 7 March 1979 to 28 October 19791980: 30 March 1980 to 10 November 19801981: 16 February 1981 to 17 November 19811982: 20 February 1982 to 25 October 19821983: 10 March 1983 to 12 November 19831984: 17 March 1984 to 5 November 19841985: 24 March 1985 to 8 November 19851986: 23 February 1986 to 12 November 19861987: 1 April 1987 to 11 November 19871988: 9 March 1988 to 13 November 19881989: 23 February 1989 to 11 November 19891990: 24 February 1990 to 16 November 19901991: 3 April 1991 to 8 November 19911992: 4 April 1992 to 2 November 19921993: 7 March 1993 to 4 November 19931994: 2 March 1994 to 1 November 19941995: 2 February 1995 to 26 November 19951996: 7 February 1996 to 12 November 19961997: 9 March 1997 to 7 November 19971998: 22 March 1998 to 24 October 19981999: 1 March 1999 to 16 November 19992000: 14 March 2000 to 21 October 20002001: 19 March 2001 to 11 November 20012002: 23 February 2002 to 23 November 20022003: 31 January 2003 to 29 October 20032004: 8 March 2004 to 16 October 20042005: 8 March 2005 to 22 November 20052006: 24 March 2006 to 20 November 20062007: 7 March 2007 to 19 November 20072008: 11 March 2008 to 22 November 20082010: 17 March 2010 to 15 November 20102011: 17 January 2011 to 1 November 20112012: 23 February 2012 to 24 November 20122013: 2 March 2013 to 14 November 20132014: 13 February 2014 to 10 November 20142015: 9 February 2015 to 21 November 20152018: 29 March 2018 to 5 November 20182019: 3 March 2019 to 9 November 20192021: 16 January 2021 to 5 December 20212022: 9 February 2022 to 25 December 20222023: 2 April 2023 to 13 November 20232024: 20 March 2024 to 28 October 20242025: 23 February 2025 to 16 December 20252026: 1 February 2026 to 31 August 202619021935194819611974198720002014JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Imperial meeting 30 C (86 F).
First to last qualifying date each year at Imperial
YearFirst dateLast date
19021902-02-161902-11-04
19031903-02-211903-10-29
19041904-02-141904-11-30
19051905-03-241905-11-15
19061906-01-261906-11-15
19261926-02-091926-11-08
19271927-02-261927-11-09
19281928-01-121928-11-12
19291929-02-231929-11-19
19301930-02-141930-11-12
19311931-03-041931-11-06
19331933-03-071933-11-25
19341934-03-011934-11-14
19351935-03-141935-10-28
19361936-03-011936-11-18
19371937-03-021937-11-05
19381938-03-201938-12-08
19391939-03-151939-11-07
19401940-03-081940-11-02
19411941-03-231941-11-16
19421942-03-291942-11-13
19431943-03-251943-11-14
19441944-03-101944-10-31
19451945-03-121945-11-04
19461946-02-241946-10-26
19471947-03-141947-11-01
19481948-04-081948-11-03
19491949-04-091949-12-01
19501950-03-041950-11-28
19511951-02-091951-10-24
19521952-03-261952-11-06
19531953-01-291953-11-25
19541954-02-071954-11-27
19551955-03-141955-11-10
19561956-03-181956-11-13
19571957-02-121957-10-27
19581958-04-101958-12-11
19591959-03-021959-11-25
19601960-03-061960-11-01
19611961-03-141961-10-26
19621962-01-071962-11-21
19631963-02-031963-11-12
19641964-03-181964-11-01
19651965-02-221965-11-07
19661966-03-111966-11-03
19671967-03-161967-11-16
19681968-02-201968-11-22
19691969-03-271969-11-04
19701970-03-141970-11-02
19711971-01-181971-11-04
19721972-02-271972-10-24
19731973-04-061973-11-12
19741974-03-141974-11-14
19751975-03-031975-11-10
19761976-01-171976-11-09
19771977-02-131977-11-26
19781978-03-171978-11-09
19791979-03-071979-10-28
19801980-03-301980-11-10
19811981-02-161981-11-17
19821982-02-201982-10-25
19831983-03-101983-11-12
19841984-03-171984-11-05
19851985-03-241985-11-08
19861986-02-231986-11-12
19871987-04-011987-11-11
19881988-03-091988-11-13
19891989-02-231989-11-11
19901990-02-241990-11-16
19911991-04-031991-11-08
19921992-04-041992-11-02
19931993-03-071993-11-04
19941994-03-021994-11-01
19951995-02-021995-11-26
19961996-02-071996-11-12
19971997-03-091997-11-07
19981998-03-221998-10-24
19991999-03-011999-11-16
20002000-03-142000-10-21
20012001-03-192001-11-11
20022002-02-232002-11-23
20032003-01-312003-10-29
20042004-03-082004-10-16
20052005-03-082005-11-22
20062006-03-242006-11-20
20072007-03-072007-11-19
20082008-03-112008-11-22
20102010-03-172010-11-15
20112011-01-172011-11-01
20122012-02-232012-11-24
20132013-03-022013-11-14
20142014-02-132014-11-10
20152015-02-092015-11-21
20182018-03-292018-11-05
20192019-03-032019-11-09
20212021-01-162021-12-05
20222022-02-092022-12-25
20232023-04-022023-11-13
20242024-03-202024-10-28
20252025-02-232025-12-16
20262026-02-012026-08-31

Every Fixed Threshold

Fixed thresholds at Imperial
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1012421904179
35 C (95 F): Days1011761902145
40 C (104 F): Days101123202492
45 C (113 F): Days9643190327
50 C (122 F): Days3219052
90 F (32.2 C): Days1012191934158
100 F (37.8 C): Days1011422024115
110 F (43.3 C): Days10178202449
120 F (48.9 C): Days5419032
0 C (32 F): Frost days (min772620111
20 C (68 F): Tropical nights (min991482003106
25 C (77 F): Days with min9996202163
10 mm (0.39 in): Days with 10 mm or more rain78919053
25 mm (0.98 in): Days with 25 mm or more rain28419051
50 mm (1.97 in): Days with 50 mm or more rain5119461

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

  • Data for Imperial 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).