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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Days at or above 40 C (104 F) in Phoenix

Phoenix has had days with a maximum temperature at or above 40 C (104 F) in 85 years, most in 2024 with 129. Days per year, season span, streaks and every date.

Key Facts for Phoenix

  • Phoenix has had days with a maximum temperature at or above 40 C (104 F) in 85 years, 5,807 days in all.
  • The most in one year was 129 days in 2024.
  • In 2026, the latest year on file, there were 98 such days.
  • The earliest first date in a year was 7 April 1989.
  • The latest last date in a year was 20 October 2023.
  • The longest run inside a single year was 75 days in 2024.
  • 9 years with under 90 percent of days observed are left out of these rankings.

Days per Year

85 years, 5,807 days
Days at or above 40 C (104 F) per year in Phoenix Days per year in Phoenix with a maximum temperature at or above 40 C (104 F). The line is the decade average. The most was 129 in 2024. Grey bars are years with under 90 percent of days observed, left out of rankings. 0501001501934: 621938: 461941: 411942: 661943: 651944: 531948: 791949: 571950: 621951: 571952: 591953: 491954: 381955: 211956: 231957: 361958: 781959: 501960: 591961: 541962: 691963: 471964: 271965: 461966: 551967: 411968: 481969: 641970: 641971: 671972: 461973: 751974: 751975: 611976: 401977: 741978: 871979: 861980: 741981: 731982: 631983: 831984: 611985: 711986: 721987: 761988: 821989: 911990: 671991: 671992: 701993: 671994: 721995: 631996: 671997: 661998: 581999: 562000: 732001: 942002: 952003: 872004: 732005: 702006: 742007: 782008: 722009: 752010: 892011: 822012: 782013: 842014: 822015: 842016: 702017: 792018: 842019: 822020: 1102021: 752022: 802023: 942024: 1292025: 902026: 98193419521962197219821992200220122022
Days per year in Phoenix with a maximum temperature at or above 40 C (104 F). The line is the decade average. The most was 129 in 2024. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days at or above 40 C (104 F) per year in Phoenix
YearDaysDecade average
19346254
19384654
19414160.2
19426660.2
19436560.2
19445360.2
19487960.2
19495760.2
19506247.3
19515747.3
19525947.3
19534947.3
19543847.3
19552147.3
19562347.3
19573647.3
19587847.3
19595047.3
19605951
19615451
19626951
19634751
19642751
19654651
19665551
19674151
19684851
19696451
19706467.5
19716767.5
19724667.5
19737567.5
19747567.5
19756167.5
19764067.5
19777467.5
19788767.5
19798667.5
19807474.6
19817374.6
19826374.6
19838374.6
19846174.6
19857174.6
19867274.6
19877674.6
19888274.6
19899174.6
19906765.3
19916765.3
19927065.3
19936765.3
19947265.3
19956365.3
19966765.3
19976665.3
19985865.3
19995665.3
20007379.1
20019479.1
20029579.1
20038779.1
20047379.1
20057079.1
20067479.1
20077879.1
20087279.1
20097579.1
20108981.4
20118281.4
20127881.4
20138481.4
20148281.4
20158481.4
20167081.4
20177981.4
20188481.4
20198281.4
202011096.6
20217596.6
20228096.6
20239496.6
202412996.6
20259096.6
20269896.6

Season Span

earliest 7 April, latest 20 October
First to last qualifying date each year in Phoenix For each year, a bar from the first to the last day in Phoenix meeting 40 C (104 F). Long bars mean a long season. 1934: 6 May 1934 to 6 October 19341938: 31 May 1938 to 27 September 19381941: 13 June 1941 to 17 September 19411942: 20 May 1942 to 28 September 19421943: 24 May 1943 to 21 September 19431944: 23 June 1944 to 23 September 19441948: 8 June 1948 to 14 September 19481949: 23 April 1949 to 21 September 19491950: 29 May 1950 to 12 October 19501951: 25 May 1951 to 25 August 19511952: 8 June 1952 to 16 September 19521953: 12 June 1953 to 16 September 19531954: 18 June 1954 to 21 September 19541955: 7 June 1955 to 11 September 19551956: 17 May 1956 to 18 September 19561957: 3 June 1957 to 7 September 19571958: 24 May 1958 to 21 September 19581959: 6 June 1959 to 7 September 19591960: 10 May 1960 to 12 September 19601961: 13 June 1961 to 27 August 19611962: 18 June 1962 to 20 September 19621963: 7 May 1963 to 25 September 19631964: 23 June 1964 to 23 August 19641965: 29 May 1965 to 28 August 19651966: 12 June 1966 to 16 August 19661967: 20 May 1967 to 23 September 19671968: 27 May 1968 to 11 September 19681969: 28 May 1969 to 28 September 19691970: 16 May 1970 to 2 September 19701971: 14 June 1971 to 16 September 19711972: 11 June 1972 to 5 September 19721973: 18 May 1973 to 15 September 19731974: 25 May 1974 to 11 September 19741975: 1 June 1975 to 16 September 19751976: 14 May 1976 to 31 August 19761977: 30 May 1977 to 9 September 19771978: 13 May 1978 to 30 September 19781979: 14 May 1979 to 3 October 19791980: 20 May 1980 to 3 October 19801981: 5 June 1981 to 16 September 19811982: 11 June 1982 to 25 September 19821983: 23 May 1983 to 15 September 19831984: 10 May 1984 to 20 September 19841985: 24 May 1985 to 14 September 19851986: 2 May 1986 to 7 September 19861987: 2 June 1987 to 8 October 19871988: 11 May 1988 to 3 October 19881989: 7 April 1989 to 29 September 19891990: 23 May 1990 to 13 September 19901991: 7 June 1991 to 10 October 19911992: 27 April 1992 to 28 September 19921993: 11 May 1993 to 3 October 19931994: 30 May 1994 to 9 September 19941995: 1 June 1995 to 13 September 19951996: 11 May 1996 to 29 August 19961997: 16 May 1997 to 1 October 19971998: 20 June 1998 to 19 September 19981999: 28 May 1999 to 14 September 19992000: 21 May 2000 to 17 September 20002001: 8 May 2001 to 30 September 20012002: 13 May 2002 to 26 September 20022003: 17 May 2003 to 1 October 20032004: 31 May 2004 to 13 September 20042005: 20 May 2005 to 22 September 20052006: 14 May 2006 to 2 September 20062007: 11 May 2007 to 14 September 20072008: 18 May 2008 to 24 September 20082009: 8 May 2009 to 28 September 20092010: 5 June 2010 to 1 October 20102011: 5 June 2011 to 30 September 20112012: 22 April 2012 to 2 October 20122013: 1 June 2013 to 20 September 20132014: 16 May 2014 to 24 September 20142015: 30 May 2015 to 1 October 20152016: 2 June 2016 to 18 September 20162017: 5 May 2017 to 13 September 20172018: 6 May 2018 to 28 September 20182019: 9 June 2019 to 14 September 20192020: 29 April 2020 to 6 October 20202021: 2 June 2021 to 16 September 20212022: 14 May 2022 to 26 September 20222023: 16 May 2023 to 20 October 20232024: 18 May 2024 to 12 October 20242025: 9 May 2025 to 25 September 20252026: 19 March 2026 to 9 October 202619341953196419751986199720082019JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Phoenix meeting 40 C (104 F). Long bars mean a long season.
First to last qualifying date each year in Phoenix
YearFirst dateLast date
19341934-05-061934-10-06
19381938-05-311938-09-27
19411941-06-131941-09-17
19421942-05-201942-09-28
19431943-05-241943-09-21
19441944-06-231944-09-23
19481948-06-081948-09-14
19491949-04-231949-09-21
19501950-05-291950-10-12
19511951-05-251951-08-25
19521952-06-081952-09-16
19531953-06-121953-09-16
19541954-06-181954-09-21
19551955-06-071955-09-11
19561956-05-171956-09-18
19571957-06-031957-09-07
19581958-05-241958-09-21
19591959-06-061959-09-07
19601960-05-101960-09-12
19611961-06-131961-08-27
19621962-06-181962-09-20
19631963-05-071963-09-25
19641964-06-231964-08-23
19651965-05-291965-08-28
19661966-06-121966-08-16
19671967-05-201967-09-23
19681968-05-271968-09-11
19691969-05-281969-09-28
19701970-05-161970-09-02
19711971-06-141971-09-16
19721972-06-111972-09-05
19731973-05-181973-09-15
19741974-05-251974-09-11
19751975-06-011975-09-16
19761976-05-141976-08-31
19771977-05-301977-09-09
19781978-05-131978-09-30
19791979-05-141979-10-03
19801980-05-201980-10-03
19811981-06-051981-09-16
19821982-06-111982-09-25
19831983-05-231983-09-15
19841984-05-101984-09-20
19851985-05-241985-09-14
19861986-05-021986-09-07
19871987-06-021987-10-08
19881988-05-111988-10-03
19891989-04-071989-09-29
19901990-05-231990-09-13
19911991-06-071991-10-10
19921992-04-271992-09-28
19931993-05-111993-10-03
19941994-05-301994-09-09
19951995-06-011995-09-13
19961996-05-111996-08-29
19971997-05-161997-10-01
19981998-06-201998-09-19
19991999-05-281999-09-14
20002000-05-212000-09-17
20012001-05-082001-09-30
20022002-05-132002-09-26
20032003-05-172003-10-01
20042004-05-312004-09-13
20052005-05-202005-09-22
20062006-05-142006-09-02
20072007-05-112007-09-14
20082008-05-182008-09-24
20092009-05-082009-09-28
20102010-06-052010-10-01
20112011-06-052011-09-30
20122012-04-222012-10-02
20132013-06-012013-09-20
20142014-05-162014-09-24
20152015-05-302015-10-01
20162016-06-022016-09-18
20172017-05-052017-09-13
20182018-05-062018-09-28
20192019-06-092019-09-14
20202020-04-292020-10-06
20212021-06-022021-09-16
20222022-05-142022-09-26
20232023-05-162023-10-20
20242024-05-182024-10-12
20252025-05-092025-09-25
20262026-03-192026-10-09

Every Year

Days at or above 40 C (104 F) per year in Phoenix
YearDaysFirst dateLast dateLongest streak in yearCoverage
20269819 March 20269 October 202621 daysIncomplete, not ranked
2025909 May 202525 September 202533 daysComplete
202412918 May 202412 October 202475 daysComplete
20239416 May 202320 October 202356 daysComplete
20228014 May 202226 September 202226 daysComplete
2021752 June 202116 September 202113 daysComplete
202011029 April 20206 October 202028 daysComplete
2019829 June 201914 September 201929 daysComplete
2018846 May 201828 September 201820 daysComplete
2017795 May 201713 September 201732 daysComplete
2016702 June 201618 September 201628 daysComplete
20158430 May 20151 October 201521 daysComplete
20148216 May 201424 September 201416 daysComplete
2013841 June 201320 September 201340 daysComplete
20127822 April 20122 October 201217 daysComplete
2011825 June 201130 September 201119 daysComplete
2010895 June 20101 October 201037 daysComplete
2009758 May 200928 September 200918 daysComplete
20087218 May 200824 September 200827 daysComplete
20077811 May 200714 September 200727 daysComplete
20067414 May 20062 September 200618 daysComplete
20057020 May 200522 September 200534 daysComplete
20047331 May 200413 September 20049 daysComplete
20038717 May 20031 October 200332 daysComplete
20029513 May 200226 September 200232 daysComplete
2001948 May 200130 September 200110 daysComplete
20007321 May 200017 September 200026 daysComplete
19995628 May 199914 September 199914 daysComplete
19985820 June 199819 September 199810 daysComplete
19976616 May 19971 October 199710 daysComplete
19966711 May 199629 August 199611 daysComplete
1995631 June 199513 September 199524 daysComplete
19947230 May 19949 September 199425 daysComplete
19936711 May 19933 October 199313 daysComplete
19927027 April 199228 September 199213 daysComplete
1991677 June 199110 October 199112 daysComplete
19906723 May 199013 September 199018 daysComplete
1989917 April 198929 September 198928 daysComplete
19888211 May 19883 October 198814 daysComplete
1987762 June 19878 October 198723 daysComplete
1986722 May 19867 September 198618 daysComplete
19857124 May 198514 September 198519 daysComplete
19846110 May 198420 September 198411 daysComplete
19838323 May 198315 September 198317 daysComplete
19826311 June 198225 September 198213 daysComplete
1981735 June 198116 September 198115 daysComplete
19807420 May 19803 October 198019 daysComplete
19798614 May 19793 October 197928 daysComplete
19788713 May 197830 September 197824 daysComplete
19777430 May 19779 September 197716 daysComplete
19764014 May 197631 August 19768 daysComplete
1975611 June 197516 September 197511 daysComplete
19747525 May 197411 September 197427 daysComplete
19737518 May 197315 September 197322 daysComplete
19724611 June 19725 September 197210 daysComplete
19716714 June 197116 September 197128 daysComplete
19706416 May 19702 September 197012 daysComplete
19696428 May 196928 September 196911 daysComplete
19684827 May 196811 September 196813 daysComplete
19674120 May 196723 September 196710 daysComplete
19665512 June 196616 August 196618 daysComplete
19654629 May 196528 August 196515 daysComplete
19642723 June 196423 August 196410 daysComplete
1963477 May 196325 September 196316 daysComplete
19626918 June 196220 September 196216 daysComplete
19615413 June 196127 August 196120 daysComplete
19605910 May 196012 September 196022 daysComplete
1959506 June 19597 September 195913 daysComplete
19587824 May 195821 September 195825 daysComplete
1957363 June 19577 September 195714 daysComplete
19562317 May 195618 September 19566 daysComplete
1955217 June 195511 September 19554 daysComplete
19543818 June 195421 September 19546 daysComplete
19534912 June 195316 September 195313 daysComplete
1952598 June 195216 September 195212 daysComplete
19515725 May 195125 August 195129 daysComplete
19506229 May 195012 October 195011 daysComplete
19495723 April 194921 September 19498 daysComplete
1948798 June 194814 September 194826 daysComplete
19445323 June 194423 September 194413 daysComplete
19436524 May 194321 September 194314 daysComplete
19426620 May 194228 September 194216 daysComplete
19414113 June 194117 September 194114 daysComplete
19384631 May 193827 September 19389 daysComplete
1934626 May 19346 October 193421 daysComplete
Decade averages for Days at or above 40 C (104 F) in Phoenix
DecadeAverage days per yearYears counted
1930s54.02
1940s60.26
1950s47.310
1960s51.010
1970s67.510
1980s74.610
1990s65.310
2000s79.110
2010s81.410
2020s96.36

Compare with your own threshold in the threshold explorer. Fahrenheit thresholds are converted to tenths of a degree Celsius once, rounding half up.

Download the Data

  • Data for Days at or above 40 C (104 F) in Phoenix, 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 from the threaded city record.

Data as of . Last revised (2026-10-17).