Days at or above 100 F (37.8 C) in Phoenix

Phoenix has had days with a maximum temperature at or above 100 F (37.8 C) in 85 years, most in 2020 with 145. Days per year, season span, streaks and every date.

Key Facts for Phoenix

Phoenix has had days with a maximum temperature at or above 100 F (37.8 C) in 85 years, 8,822 days in all.
The most in one year was 145 days in 2020.
In 2026, the latest year on file, there were 131 such days.
The earliest first date in a year was 26 March 1988.
The latest last date in a year was 27 October 2016.
The longest run inside a single year was 113 days in 2024.
9 years with under 90 percent of days observed are left out of these rankings.

Days per Year

85 years, 8,822 days

Days per year in Phoenix with a maximum temperature at or above 100 F (37.8 C). The line is the decade average. The most was 145 in 2020. Grey bars are years with under 90 percent of days observed, left out of rankings.

Days at or above 100 F (37.8 C) per year in Phoenix
Year	Days	Decade average
1934	110	101.5
1938	93	101.5
1941	76	96
1942	100	96
1943	103	96
1944	88	96
1948	113	96
1949	96	96
1950	109	85.8
1951	92	85.8
1952	104	85.8
1953	92	85.8
1954	73	85.8
1955	60	85.8
1956	70	85.8
1957	70	85.8
1958	110	85.8
1959	78	85.8
1960	98	88.6
1961	79	88.6
1962	100	88.6
1963	84	88.6
1964	68	88.6
1965	83	88.6
1966	104	88.6
1967	80	88.6
1968	87	88.6
1969	103	88.6
1970	94	100.8
1971	82	100.8
1972	89	100.8
1973	116	100.8
1974	107	100.8
1975	111	100.8
1976	82	100.8
1977	102	100.8
1978	116	100.8
1979	109	100.8
1980	107	111.2
1981	107	111.2
1982	98	111.2
1983	107	111.2
1984	109	111.2
1985	102	111.2
1986	101	111.2
1987	116	111.2
1988	122	111.2
1989	143	111.2
1990	94	102.8
1991	112	102.8
1992	120	102.8
1993	108	102.8
1994	106	102.8
1995	93	102.8
1996	107	102.8
1997	108	102.8
1998	88	102.8
1999	92	102.8
2000	119	114.6
2001	127	114.6
2002	115	114.6
2003	129	114.6
2004	109	114.6
2005	105	114.6
2006	105	114.6
2007	113	114.6
2008	106	114.6
2009	118	114.6
2010	108	111.4
2011	117	111.4
2012	117	111.4
2013	115	111.4
2014	110	111.4
2015	108	111.4
2016	99	111.4
2017	109	111.4
2018	128	111.4
2019	103	111.4
2020	145	127.3
2021	104	127.3
2022	113	127.3
2023	133	127.3
2024	143	127.3
2025	122	127.3
2026	131	127.3

Season Span

earliest 26 March, latest 27 October

For each year, a bar from the first to the last day in Phoenix meeting 100 F (37.8 C). Long bars mean a long season.

First to last qualifying date each year in Phoenix
Year	First date	Last date
1934	1934-04-21	1934-10-09
1938	1938-05-14	1938-09-28
1941	1941-05-08	1941-09-19
1942	1942-05-19	1942-09-29
1943	1943-04-23	1943-10-01
1944	1944-06-06	1944-10-10
1948	1948-04-16	1948-10-08
1949	1949-04-22	1949-09-27
1950	1950-04-19	1950-10-16
1951	1951-05-25	1951-09-28
1952	1952-05-12	1952-10-06
1953	1953-06-10	1953-10-01
1954	1954-06-02	1954-09-21
1955	1955-05-29	1955-09-14
1956	1956-05-17	1956-09-28
1957	1957-06-01	1957-09-29
1958	1958-05-18	1958-09-21
1959	1959-05-13	1959-09-12
1960	1960-05-10	1960-09-28
1961	1961-05-09	1961-09-07
1962	1962-04-14	1962-09-21
1963	1963-05-06	1963-10-03
1964	1964-05-15	1964-09-12
1965	1965-05-18	1965-09-27
1966	1966-05-06	1966-09-24
1967	1967-05-16	1967-09-24
1968	1968-05-19	1968-09-27
1969	1969-05-17	1969-09-30
1970	1970-05-15	1970-09-12
1971	1971-06-13	1971-09-17
1972	1972-05-27	1972-10-02
1973	1973-05-10	1973-10-16
1974	1974-05-12	1974-10-02
1975	1975-05-10	1975-10-05
1976	1976-05-12	1976-09-30
1977	1977-05-30	1977-10-03
1978	1978-05-12	1978-10-15
1979	1979-05-13	1979-10-10
1980	1980-04-19	1980-10-07
1981	1981-04-29	1981-09-28
1982	1982-05-18	1982-09-26
1983	1983-05-22	1983-09-22
1984	1984-04-16	1984-09-21
1985	1985-04-14	1985-09-17
1986	1986-05-02	1986-09-09
1987	1987-04-16	1987-10-08
1988	1988-03-26	1988-10-06
1989	1989-04-06	1989-10-13
1990	1990-04-15	1990-09-25
1991	1991-05-08	1991-10-18
1992	1992-04-25	1992-10-12
1993	1993-05-10	1993-10-05
1994	1994-04-16	1994-09-28
1995	1995-05-31	1995-10-11
1996	1996-04-26	1996-10-12
1997	1997-05-05	1997-10-06
1998	1998-06-02	1998-09-19
1999	1999-05-21	1999-10-13
2000	2000-04-26	2000-10-02
2001	2001-04-25	2001-09-30
2002	2002-04-14	2002-09-27
2003	2003-05-16	2003-10-23
2004	2004-05-03	2004-09-28
2005	2005-05-15	2005-10-07
2006	2006-05-11	2006-10-05
2007	2007-04-28	2007-09-21
2008	2008-05-18	2008-10-02
2009	2009-04-21	2009-10-18
2010	2010-05-21	2010-10-14
2011	2011-04-01	2011-10-03
2012	2012-04-21	2012-10-04
2013	2013-04-28	2013-09-21
2014	2014-05-03	2014-09-26
2015	2015-05-01	2015-10-14
2016	2016-05-04	2016-10-27
2017	2017-05-03	2017-09-19
2018	2018-04-10	2018-09-29
2019	2019-04-26	2019-09-19
2020	2020-04-26	2020-10-16
2021	2021-05-05	2021-09-23
2022	2022-05-07	2022-09-29
2023	2023-04-30	2023-10-21
2024	2024-04-21	2024-10-26
2025	2025-04-10	2025-10-08
2026	2026-03-18	2026-10-09

Every Year

Days at or above 100 F (37.8 C) per year in Phoenix
Year	Days	First date	Last date	Longest streak in year	Coverage
2026	131	18 March 2026	9 October 2026	46 days	Incomplete, not ranked
2025	122	10 April 2025	8 October 2025	36 days	Complete
2024	143	21 April 2024	26 October 2024	113 days	Complete
2023	133	30 April 2023	21 October 2023	66 days	Complete
2022	113	7 May 2022	29 September 2022	37 days	Complete
2021	104	5 May 2021	23 September 2021	20 days	Complete
2020	145	26 April 2020	16 October 2020	46 days	Complete
2019	103	26 April 2019	19 September 2019	41 days	Complete
2018	128	10 April 2018	29 September 2018	35 days	Complete
2017	109	3 May 2017	19 September 2017	33 days	Complete
2016	99	4 May 2016	27 October 2016	32 days	Complete
2015	108	1 May 2015	14 October 2015	38 days	Complete
2014	110	3 May 2014	26 September 2014	35 days	Complete
2013	115	28 April 2013	21 September 2013	42 days	Complete
2012	117	21 April 2012	4 October 2012	36 days	Complete
2011	117	1 April 2011	3 October 2011	47 days	Complete
2010	108	21 May 2010	14 October 2010	39 days	Complete
2009	118	21 April 2009	18 October 2009	48 days	Complete
2008	106	18 May 2008	2 October 2008	34 days	Complete
2007	113	28 April 2007	21 September 2007	41 days	Complete
2006	105	11 May 2006	5 October 2006	35 days	Complete
2005	105	15 May 2005	7 October 2005	51 days	Complete
2004	109	3 May 2004	28 September 2004	32 days	Complete
2003	129	16 May 2003	23 October 2003	33 days	Complete
2002	115	14 April 2002	27 September 2002	60 days	Complete
2001	127	25 April 2001	30 September 2001	33 days	Complete
2000	119	26 April 2000	2 October 2000	30 days	Complete
1999	92	21 May 1999	13 October 1999	26 days	Complete
1998	88	2 June 1998	19 September 1998	25 days	Complete
1997	108	5 May 1997	6 October 1997	34 days	Complete
1996	107	26 April 1996	12 October 1996	37 days	Complete
1995	93	31 May 1995	11 October 1995	29 days	Complete
1994	106	16 April 1994	28 September 1994	25 days	Complete
1993	108	10 May 1993	5 October 1993	76 days	Complete
1992	120	25 April 1992	12 October 1992	16 days	Complete
1991	112	8 May 1991	18 October 1991	22 days	Complete
1990	94	15 April 1990	25 September 1990	19 days	Complete
1989	143	6 April 1989	13 October 1989	64 days	Complete
1988	122	26 March 1988	6 October 1988	47 days	Complete
1987	116	16 April 1987	8 October 1987	39 days	Complete
1986	101	2 May 1986	9 September 1986	32 days	Complete
1985	102	14 April 1985	17 September 1985	22 days	Complete
1984	109	16 April 1984	21 September 1984	39 days	Complete
1983	107	22 May 1983	22 September 1983	38 days	Complete
1982	98	18 May 1982	26 September 1982	34 days	Complete
1981	107	29 April 1981	28 September 1981	29 days	Complete
1980	107	19 April 1980	7 October 1980	38 days	Complete
1979	109	13 May 1979	10 October 1979	30 days	Complete
1978	116	12 May 1978	15 October 1978	44 days	Complete
1977	102	30 May 1977	3 October 1977	24 days	Complete
1976	82	12 May 1976	30 September 1976	19 days	Complete
1975	111	10 May 1975	5 October 1975	36 days	Complete
1974	107	12 May 1974	2 October 1974	38 days	Complete
1973	116	10 May 1973	16 October 1973	33 days	Complete
1972	89	27 May 1972	2 October 1972	21 days	Complete
1971	82	13 June 1971	17 September 1971	28 days	Complete
1970	94	15 May 1970	12 September 1970	34 days	Complete
1969	103	17 May 1969	30 September 1969	20 days	Complete
1968	87	19 May 1968	27 September 1968	23 days	Complete
1967	80	16 May 1967	24 September 1967	14 days	Complete
1966	104	6 May 1966	24 September 1966	49 days	Complete
1965	83	18 May 1965	27 September 1965	20 days	Complete
1964	68	15 May 1964	12 September 1964	16 days	Complete
1963	84	6 May 1963	3 October 1963	36 days	Complete
1962	100	14 April 1962	21 September 1962	46 days	Complete
1961	79	9 May 1961	7 September 1961	27 days	Complete
1960	98	10 May 1960	28 September 1960	32 days	Complete
1959	78	13 May 1959	12 September 1959	32 days	Complete
1958	110	18 May 1958	21 September 1958	38 days	Complete
1957	70	1 June 1957	29 September 1957	19 days	Complete
1956	70	17 May 1956	28 September 1956	8 days	Complete
1955	60	29 May 1955	14 September 1955	19 days	Complete
1954	73	2 June 1954	21 September 1954	16 days	Complete
1953	92	10 June 1953	1 October 1953	24 days	Complete
1952	104	12 May 1952	6 October 1952	20 days	Complete
1951	92	25 May 1951	28 September 1951	47 days	Complete
1950	109	19 April 1950	16 October 1950	29 days	Complete
1949	96	22 April 1949	27 September 1949	25 days	Complete
1948	113	16 April 1948	8 October 1948	38 days	Complete
1944	88	6 June 1944	10 October 1944	27 days	Complete
1943	103	23 April 1943	1 October 1943	33 days	Complete
1942	100	19 May 1942	29 September 1942	33 days	Complete
1941	76	8 May 1941	19 September 1941	16 days	Complete
1938	93	14 May 1938	28 September 1938	14 days	Complete
1934	110	21 April 1934	9 October 1934	24 days	Complete

Decade averages for Days at or above 100 F (37.8 C) in Phoenix
Decade	Average days per year	Years counted
1930s	101.5	2
1940s	96.0	6
1950s	85.8	10
1960s	88.6	10
1970s	100.8	10
1980s	111.2	10
1990s	102.8	10
2000s	114.6	10
2010s	111.4	10
2020s	126.7	6

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 100 F (37.8 C) 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).