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Built 2026-10-19 (19 October 2026)

Nights at or above 25 C (77 F) in Washington, D.C.

Washington, D.C. has had nights with a minimum temperature at or above 25 C (77 F) in 61 years, most in 1980 with 19. 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 25 C (77 F) in 61 years, 402 days in all.
  • The most in one year was 19 days in 1980.
  • In 2026, the latest year on file, there were 6 such days.
  • The earliest first date in a year was 31 May 1991.
  • The latest last date in a year was 10 September 2016.
  • The longest run inside a single year was 7 days in 2011.
  • 2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

61 years, 402 days
Nights at or above 25 C (77 F) per year in Washington, D.C. Days per year in Washington, D.C. with a minimum temperature at or above 25 C (77 F). The line is the decade average. The most was 19 in 1980. Grey bars are years with under 90 percent of days observed, left out of rankings. 051015201943: 31945: 11949: 51950: 11951: 11952: 81954: 11955: 71957: 21959: 61965: 11966: 11968: 51969: 11972: 31973: 11974: 11975: 21977: 51978: 81979: 71980: 191981: 61982: 51983: 91985: 11986: 21987: 121988: 91989: 41990: 11991: 81992: 51993: 81994: 31995: 101997: 21999: 112001: 32002: 132005: 92006: 92007: 22008: 42010: 132011: 162012: 162013: 82014: 52015: 162016: 192017: 72018: 152019: 72020: 82021: 52022: 52023: 42024: 172025: 102026: 61943196519791990200520162026
Days per year in Washington, D.C. with a minimum temperature at or above 25 C (77 F). The line is the decade average. The most was 19 in 1980. Grey bars are years with under 90 percent of days observed, left out of rankings.
Nights at or above 25 C (77 F) per year in Washington, D.C.
YearDaysDecade average
194333
194513
194953
195013.7
195113.7
195283.7
195413.7
195573.7
195723.7
195963.7
196512
196612
196852
196912
197233.9
197313.9
197413.9
197523.9
197753.9
197883.9
197973.9
1980197.4
198167.4
198257.4
198397.4
198517.4
198627.4
1987127.4
198897.4
198947.4
199016
199186
199256
199386
199436
1995106
199726
1999116
200136.7
2002136.7
200596.7
200696.7
200726.7
200846.7
20101312.2
20111612.2
20121612.2
2013812.2
2014512.2
20151612.2
20161912.2
2017712.2
20181512.2
2019712.2
202087.9
202157.9
202257.9
202347.9
2024177.9
2025107.9
202667.9

Season Span

earliest 31 May, latest 10 September
First to last qualifying date each year in Washington, D.C. For each year, a bar from the first to the last day in Washington, D.C. meeting 25 C (77 F). Long bars mean a long season. 1943: 5 June 1943 to 10 August 19431945: 30 June 1945 to 30 June 19451949: 23 July 1949 to 29 July 19491950: 1 August 1950 to 1 August 19501951: 10 August 1951 to 10 August 19511952: 26 June 1952 to 29 July 19521954: 1 August 1954 to 1 August 19541955: 3 July 1955 to 5 August 19551957: 18 June 1957 to 22 July 19571959: 27 June 1959 to 27 August 19591965: 25 July 1965 to 25 July 19651966: 28 July 1966 to 28 July 19661968: 18 July 1968 to 24 August 19681969: 18 July 1969 to 18 July 19691972: 20 July 1972 to 23 July 19721973: 1 September 1973 to 1 September 19731974: 15 July 1974 to 15 July 19741975: 20 June 1975 to 20 July 19751977: 1 July 1977 to 10 August 19771978: 22 July 1978 to 25 August 19781979: 16 July 1979 to 10 August 19791980: 3 July 1980 to 3 September 19801981: 16 June 1981 to 8 August 19811982: 13 July 1982 to 5 August 19821983: 16 July 1983 to 6 September 19831985: 14 August 1985 to 14 August 19851986: 8 July 1986 to 19 July 19861987: 8 July 1987 to 18 August 19871988: 23 June 1988 to 14 August 19881989: 11 July 1989 to 6 August 19891990: 10 July 1990 to 10 July 19901991: 31 May 1991 to 4 August 19911992: 9 July 1992 to 15 July 19921993: 5 July 1993 to 3 September 19931994: 8 July 1994 to 21 July 19941995: 15 July 1995 to 18 August 19951997: 16 July 1997 to 16 August 19971999: 8 June 1999 to 13 August 19992001: 25 July 2001 to 10 August 20012002: 3 July 2002 to 23 August 20022005: 18 July 2005 to 15 August 20052006: 18 July 2006 to 28 August 20062007: 7 August 2007 to 8 August 20072008: 9 June 2008 to 31 July 20082010: 24 June 2010 to 3 September 20102011: 9 June 2011 to 9 August 20112012: 21 June 2012 to 5 September 20122013: 6 July 2013 to 9 August 20132014: 18 June 2014 to 3 September 20142015: 12 June 2015 to 19 August 20152016: 6 July 2016 to 10 September 20162017: 12 July 2017 to 18 August 20172018: 19 June 2018 to 6 September 20182019: 5 July 2019 to 19 August 20192020: 4 July 2020 to 2 August 20202021: 7 July 2021 to 18 August 20212022: 19 July 2022 to 9 August 20222023: 27 July 2023 to 7 September 20232024: 22 June 2024 to 9 August 20242025: 24 June 2025 to 16 August 20252026: 2 July 2026 to 1 September 202619431957197419831992200520142022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Washington, D.C. meeting 25 C (77 F). Long bars mean a long season.
First to last qualifying date each year in Washington, D.C.
YearFirst dateLast date
19431943-06-051943-08-10
19451945-06-301945-06-30
19491949-07-231949-07-29
19501950-08-011950-08-01
19511951-08-101951-08-10
19521952-06-261952-07-29
19541954-08-011954-08-01
19551955-07-031955-08-05
19571957-06-181957-07-22
19591959-06-271959-08-27
19651965-07-251965-07-25
19661966-07-281966-07-28
19681968-07-181968-08-24
19691969-07-181969-07-18
19721972-07-201972-07-23
19731973-09-011973-09-01
19741974-07-151974-07-15
19751975-06-201975-07-20
19771977-07-011977-08-10
19781978-07-221978-08-25
19791979-07-161979-08-10
19801980-07-031980-09-03
19811981-06-161981-08-08
19821982-07-131982-08-05
19831983-07-161983-09-06
19851985-08-141985-08-14
19861986-07-081986-07-19
19871987-07-081987-08-18
19881988-06-231988-08-14
19891989-07-111989-08-06
19901990-07-101990-07-10
19911991-05-311991-08-04
19921992-07-091992-07-15
19931993-07-051993-09-03
19941994-07-081994-07-21
19951995-07-151995-08-18
19971997-07-161997-08-16
19991999-06-081999-08-13
20012001-07-252001-08-10
20022002-07-032002-08-23
20052005-07-182005-08-15
20062006-07-182006-08-28
20072007-08-072007-08-08
20082008-06-092008-07-31
20102010-06-242010-09-03
20112011-06-092011-08-09
20122012-06-212012-09-05
20132013-07-062013-08-09
20142014-06-182014-09-03
20152015-06-122015-08-19
20162016-07-062016-09-10
20172017-07-122017-08-18
20182018-06-192018-09-06
20192019-07-052019-08-19
20202020-07-042020-08-02
20212021-07-072021-08-18
20222022-07-192022-08-09
20232023-07-272023-09-07
20242024-06-222024-08-09
20252025-06-242025-08-16
20262026-07-022026-09-01

Every Year

Nights at or above 25 C (77 F) per year in Washington, D.C.
YearDaysFirst dateLast dateLongest streak in yearCoverage
202662 July 20261 September 20263 daysIncomplete, not ranked
20251024 June 202516 August 20252 daysComplete
20241722 June 20249 August 20246 daysComplete
2023427 July 20237 September 20232 daysComplete
2022519 July 20229 August 20222 daysComplete
202157 July 202118 August 20212 daysComplete
202084 July 20202 August 20203 daysComplete
201975 July 201919 August 20194 daysComplete
20181519 June 20186 September 20185 daysComplete
2017712 July 201718 August 20174 daysComplete
2016196 July 201610 September 20166 daysComplete
20151612 June 201519 August 20154 daysComplete
2014518 June 20143 September 20142 daysComplete
201386 July 20139 August 20136 daysComplete
20121621 June 20125 September 20125 daysComplete
2011169 June 20119 August 20117 daysComplete
20101324 June 20103 September 20103 daysComplete
200849 June 200831 July 20082 daysComplete
200727 August 20078 August 20072 daysComplete
2006918 July 200628 August 20066 daysComplete
2005918 July 200515 August 20054 daysComplete
2002133 July 200223 August 20024 daysComplete
2001325 July 200110 August 20012 daysComplete
1999118 June 199913 August 19994 daysComplete
1997216 July 199716 August 19971 daysComplete
19951015 July 199518 August 19953 daysComplete
199438 July 199421 July 19941 daysComplete
199385 July 19933 September 19932 daysComplete
199259 July 199215 July 19923 daysComplete
1991831 May 19914 August 19914 daysComplete
1990110 July 199010 July 19901 daysComplete
1989411 July 19896 August 19892 daysComplete
1988923 June 198814 August 19883 daysComplete
1987128 July 198718 August 19874 daysComplete
198628 July 198619 July 19861 daysComplete
1985114 August 198514 August 19851 daysComplete
1983916 July 19836 September 19834 daysComplete
1982513 July 19825 August 19822 daysComplete
1981616 June 19818 August 19812 daysComplete
1980193 July 19803 September 19805 daysComplete
1979716 July 197910 August 19793 daysComplete
1978822 July 197825 August 19783 daysComplete
197751 July 197710 August 19772 daysComplete
1975220 June 197520 July 19751 daysComplete
1974115 July 197415 July 19741 daysComplete
197311 September 19731 September 19731 daysComplete
1972320 July 197223 July 19722 daysComplete
1969118 July 196918 July 19691 daysComplete
1968518 July 196824 August 19682 daysComplete
1966128 July 196628 July 19661 daysComplete
1965125 July 196525 July 19651 daysComplete
1959627 June 195927 August 19594 daysComplete
1957218 June 195722 July 19571 daysComplete
195573 July 19555 August 19552 daysComplete
195411 August 19541 August 19541 daysComplete
1952826 June 195229 July 19523 daysComplete
1951110 August 195110 August 19511 daysComplete
195011 August 19501 August 19501 daysComplete
1949523 July 194929 July 19494 daysComplete
1945130 June 194530 June 19451 daysComplete
194335 June 194310 August 19431 daysComplete
Decade averages for Nights at or above 25 C (77 F) in Washington, D.C.
DecadeAverage days per yearYears counted
1940s3.03
1950s3.77
1960s2.04
1970s3.97
1980s7.49
1990s6.08
2000s6.76
2010s12.210
2020s8.26

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 25 C (77 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 . Last revised (2026-10-17).