Nights at or above 20 C (68 F) in Washington, D.C.

Washington, D.C. has had nights with a minimum temperature at or above 20 C (68 F) in 85 years, most in 2018 with 105. Days per year, season span, streaks and every date.

Key Facts for Washington, D.C.

Washington, D.C. has had nights with a minimum temperature at or above 20 C (68 F) in 85 years, 5,888 days in all.
The most in one year was 105 days in 2018.
In 2026, the latest year on file, there were 88 such days.
The earliest first date in a year was 23 April 1977.
The latest last date in a year was 2 November 1971.
The longest run inside a single year was 51 days in 2010.
2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

85 years, 5,888 days

Days per year in Washington, D.C. with a minimum temperature at or above 20 C (68 F). The line is the decade average. The most was 105 in 2018. Grey bars are years with under 90 percent of days observed, left out of rankings.

Nights at or above 20 C (68 F) per year in Washington, D.C.
Year	Days	Decade average
1942	61	58.5
1943	69	58.5
1944	56	58.5
1945	57	58.5
1946	38	58.5
1947	64	58.5
1948	48	58.5
1949	75	58.5
1950	44	59.2
1951	57	59.2
1952	63	59.2
1953	56	59.2
1954	49	59.2
1955	69	59.2
1956	48	59.2
1957	64	59.2
1958	51	59.2
1959	91	59.2
1960	63	54.7
1961	72	54.7
1962	43	54.7
1963	35	54.7
1964	49	54.7
1965	58	54.7
1966	58	54.7
1967	43	54.7
1968	58	54.7
1969	68	54.7
1970	68	67.1
1971	66	67.1
1972	48	67.1
1973	79	67.1
1974	57	67.1
1975	77	67.1
1976	60	67.1
1977	70	67.1
1978	79	67.1
1979	67	67.1
1980	90	72
1981	82	72
1982	54	72
1983	77	72
1984	66	72
1985	60	72
1986	75	72
1987	75	72
1988	65	72
1989	76	72
1990	69	68.1
1991	86	68.1
1992	45	68.1
1993	72	68.1
1994	70	68.1
1995	71	68.1
1996	72	68.1
1997	52	68.1
1998	74	68.1
1999	70	68.1
2000	54	69.7
2001	53	69.7
2002	70	69.7
2003	69	69.7
2004	78	69.7
2005	83	69.7
2006	68	69.7
2007	80	69.7
2008	82	69.7
2009	60	69.7
2010	95	92.7
2011	93	92.7
2012	91	92.7
2013	83	92.7
2014	82	92.7
2015	98	92.7
2016	98	92.7
2017	85	92.7
2018	105	92.7
2019	97	92.7
2020	89	83.6
2021	90	83.6
2022	83	83.6
2023	74	83.6
2024	93	83.6
2025	68	83.6
2026	88	83.6

Season Span

earliest 23 April, latest 2 November

For each year, a bar from the first to the last day in Washington, D.C. meeting 20 C (68 F). Long bars mean a long season.

First to last qualifying date each year in Washington, D.C.
Year	First date	Last date
1942	1942-06-08	1942-09-19
1943	1943-05-18	1943-09-07
1944	1944-05-27	1944-09-20
1945	1945-06-12	1945-09-28
1946	1946-06-01	1946-09-24
1947	1947-05-21	1947-10-18
1948	1948-06-13	1948-09-09
1949	1949-05-19	1949-09-19
1950	1950-06-03	1950-09-03
1951	1951-06-03	1951-10-06
1952	1952-06-07	1952-09-15
1953	1953-05-18	1953-09-04
1954	1954-06-02	1954-10-05
1955	1955-05-23	1955-10-07
1956	1956-04-29	1956-09-06
1957	1957-06-07	1957-09-22
1958	1958-06-09	1958-09-17
1959	1959-05-20	1959-10-10
1960	1960-05-21	1960-09-19
1961	1961-06-02	1961-09-24
1962	1962-05-19	1962-09-11
1963	1963-06-05	1963-09-12
1964	1964-05-24	1964-09-11
1965	1965-05-27	1965-09-23
1966	1966-06-07	1966-09-05
1967	1967-06-11	1967-09-21
1968	1968-06-08	1968-09-26
1969	1969-05-20	1969-10-03
1970	1970-06-02	1970-09-26
1971	1971-05-25	1971-11-02
1972	1972-06-14	1972-09-27
1973	1973-05-29	1973-09-29
1974	1974-05-17	1974-09-20
1975	1975-05-22	1975-09-20
1976	1976-05-16	1976-09-27
1977	1977-04-23	1977-09-24
1978	1978-05-31	1978-09-21
1979	1979-05-10	1979-09-30
1980	1980-05-13	1980-09-25
1981	1981-05-26	1981-09-15
1982	1982-05-29	1982-09-16
1983	1983-05-02	1983-10-12
1984	1984-05-26	1984-10-22
1985	1985-06-01	1985-09-10
1986	1986-05-19	1986-10-04
1987	1987-05-23	1987-09-18
1988	1988-06-01	1988-09-20
1989	1989-05-26	1989-09-22
1990	1990-06-03	1990-10-13
1991	1991-05-13	1991-09-18
1992	1992-06-08	1992-09-22
1993	1993-06-09	1993-09-15
1994	1994-06-06	1994-09-17
1995	1995-05-18	1995-10-06
1996	1996-05-21	1996-09-12
1997	1997-06-13	1997-09-10
1998	1998-05-20	1998-09-30
1999	1999-06-02	1999-09-28
2000	2000-05-08	2000-09-13
2001	2001-06-12	2001-09-10
2002	2002-05-30	2002-10-04
2003	2003-06-12	2003-09-22
2004	2004-05-11	2004-09-17
2005	2005-06-06	2005-10-07
2006	2006-05-30	2006-09-24
2007	2007-05-27	2007-10-23
2008	2008-05-27	2008-09-28
2009	2009-05-24	2009-09-24
2010	2010-05-02	2010-10-27
2011	2011-05-26	2011-09-28
2012	2012-05-24	2012-10-03
2013	2013-05-21	2013-10-06
2014	2014-05-27	2014-09-11
2015	2015-05-10	2015-09-29
2016	2016-05-27	2016-10-20
2017	2017-04-29	2017-10-10
2018	2018-05-04	2018-10-11
2019	2019-05-20	2019-10-03
2020	2020-05-28	2020-09-27
2021	2021-05-23	2021-10-05
2022	2022-05-21	2022-09-20
2023	2023-06-20	2023-10-06
2024	2024-05-07	2024-09-29
2025	2025-05-02	2025-09-26
2026	2026-04-17	2026-09-20

Every Year

Nights at or above 20 C (68 F) per year in Washington, D.C.
Year	Days	First date	Last date	Longest streak in year	Coverage
2026	88	17 April 2026	20 September 2026	27 days	Incomplete, not ranked
2025	68	2 May 2025	26 September 2025	41 days	Complete
2024	93	7 May 2024	29 September 2024	48 days	Complete
2023	74	20 June 2023	6 October 2023	32 days	Complete
2022	83	21 May 2022	20 September 2022	32 days	Complete
2021	90	23 May 2021	5 October 2021	28 days	Complete
2020	89	28 May 2020	27 September 2020	50 days	Complete
2019	97	20 May 2019	3 October 2019	15 days	Complete
2018	105	4 May 2018	11 October 2018	31 days	Complete
2017	85	29 April 2017	10 October 2017	30 days	Complete
2016	98	27 May 2016	20 October 2016	50 days	Complete
2015	98	10 May 2015	29 September 2015	28 days	Complete
2014	82	27 May 2014	11 September 2014	19 days	Complete
2013	83	21 May 2013	6 October 2013	32 days	Complete
2012	91	24 May 2012	3 October 2012	30 days	Complete
2011	93	26 May 2011	28 September 2011	37 days	Complete
2010	95	2 May 2010	27 October 2010	51 days	Complete
2009	60	24 May 2009	24 September 2009	23 days	Complete
2008	82	27 May 2008	28 September 2008	22 days	Complete
2007	80	27 May 2007	23 October 2007	17 days	Complete
2006	68	30 May 2006	24 September 2006	17 days	Complete
2005	83	6 June 2005	7 October 2005	31 days	Complete
2004	78	11 May 2004	17 September 2004	19 days	Complete
2003	69	12 June 2003	22 September 2003	29 days	Complete
2002	70	30 May 2002	4 October 2002	17 days	Complete
2001	53	12 June 2001	10 September 2001	17 days	Complete
2000	54	8 May 2000	13 September 2000	8 days	Complete
1999	70	2 June 1999	28 September 1999	25 days	Complete
1998	74	20 May 1998	30 September 1998	13 days	Complete
1997	52	13 June 1997	10 September 1997	9 days	Complete
1996	72	21 May 1996	12 September 1996	18 days	Complete
1995	71	18 May 1995	6 October 1995	27 days	Complete
1994	70	6 June 1994	17 September 1994	31 days	Complete
1993	72	9 June 1993	15 September 1993	26 days	Complete
1992	45	8 June 1992	22 September 1992	19 days	Complete
1991	86	13 May 1991	18 September 1991	30 days	Complete
1990	69	3 June 1990	13 October 1990	18 days	Complete
1989	76	26 May 1989	22 September 1989	10 days	Complete
1988	65	1 June 1988	20 September 1988	44 days	Complete
1987	75	23 May 1987	18 September 1987	25 days	Complete
1986	75	19 May 1986	4 October 1986	39 days	Complete
1985	60	1 June 1985	10 September 1985	15 days	Complete
1984	66	26 May 1984	22 October 1984	19 days	Complete
1983	77	2 May 1983	12 October 1983	20 days	Complete
1982	54	29 May 1982	16 September 1982	19 days	Complete
1981	82	26 May 1981	15 September 1981	15 days	Complete
1980	90	13 May 1980	25 September 1980	33 days	Complete
1979	67	10 May 1979	30 September 1979	33 days	Complete
1978	79	31 May 1978	21 September 1978	22 days	Complete
1977	70	23 April 1977	24 September 1977	19 days	Complete
1976	60	16 May 1976	27 September 1976	18 days	Complete
1975	77	22 May 1975	20 September 1975	21 days	Complete
1974	57	17 May 1974	20 September 1974	13 days	Complete
1973	79	29 May 1973	29 September 1973	24 days	Complete
1972	48	14 June 1972	27 September 1972	18 days	Complete
1971	66	25 May 1971	2 November 1971	13 days	Complete
1970	68	2 June 1970	26 September 1970	11 days	Complete
1969	68	20 May 1969	3 October 1969	23 days	Complete
1968	58	8 June 1968	26 September 1968	13 days	Complete
1967	43	11 June 1967	21 September 1967	15 days	Complete
1966	58	7 June 1966	5 September 1966	8 days	Complete
1965	58	27 May 1965	23 September 1965	7 days	Complete
1964	49	24 May 1964	11 September 1964	14 days	Complete
1963	35	5 June 1963	12 September 1963	11 days	Complete
1962	43	19 May 1962	11 September 1962	7 days	Complete
1961	72	2 June 1961	24 September 1961	31 days	Complete
1960	63	21 May 1960	19 September 1960	13 days	Complete
1959	91	20 May 1959	10 October 1959	35 days	Complete
1958	51	9 June 1958	17 September 1958	12 days	Complete
1957	64	7 June 1957	22 September 1957	9 days	Complete
1956	48	29 April 1956	6 September 1956	9 days	Complete
1955	69	23 May 1955	7 October 1955	24 days	Complete
1954	49	2 June 1954	5 October 1954	6 days	Complete
1953	56	18 May 1953	4 September 1953	13 days	Complete
1952	63	7 June 1952	15 September 1952	32 days	Complete
1951	57	3 June 1951	6 October 1951	11 days	Complete
1950	44	3 June 1950	3 September 1950	10 days	Complete
1949	75	19 May 1949	19 September 1949	45 days	Complete
1948	48	13 June 1948	9 September 1948	9 days	Complete
1947	64	21 May 1947	18 October 1947	21 days	Complete
1946	38	1 June 1946	24 September 1946	8 days	Complete
1945	57	12 June 1945	28 September 1945	16 days	Complete
1944	56	27 May 1944	20 September 1944	15 days	Complete
1943	69	18 May 1943	7 September 1943	14 days	Complete
1942	61	8 June 1942	19 September 1942	11 days	Complete

Decade averages for Nights at or above 20 C (68 F) in Washington, D.C.
Decade	Average days per year	Years counted
1940s	58.5	8
1950s	59.2	10
1960s	54.7	10
1970s	67.1	10
1980s	72.0	10
1990s	68.1	10
2000s	69.7	10
2010s	92.7	10
2020s	82.8	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 Nights at or above 20 C (68 F) in Washington, D.C., 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).