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Built 2026-10-19 (19 October 2026)

Days at or above 40 C (104 F) in Washington, D.C.

Washington, D.C. has had days with a maximum temperature at or above 40 C (104 F) in 5 years, most in 2012 with 2. Days per year, season span, streaks and every date.

Key Facts for Washington, D.C.

  • Washington, D.C. has had days with a maximum temperature at or above 40 C (104 F) in 5 years, 6 days in all.
  • The most in one year was 2 days in 2012.
  • In 2024, the latest year on file, there were 1 such days.
  • The earliest first date in a year was 29 June 2012.
  • The latest last date in a year was 17 August 1997.
  • 2 years with under 90 percent of days observed are left out of these rankings.

Days per Year

5 years, 6 days
Days at or above 40 C (104 F) per year in Washington, D.C. Days per year in Washington, D.C. with a maximum temperature at or above 40 C (104 F). The line is the decade average. The most was 2 in 2012. Grey bars are years with under 90 percent of days observed, left out of rankings. 011221988: 11997: 12011: 12012: 22024: 11988
Days per year in Washington, D.C. with a maximum temperature at or above 40 C (104 F). The line is the decade average. The most was 2 in 2012. 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 Washington, D.C.
YearDaysDecade average
198811
199711
201111.5
201221.5
202411

Season Span

earliest 29 June, latest 17 August
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 40 C (104 F). Long bars mean a long season. 1988: 16 July 1988 to 16 July 19881997: 17 August 1997 to 17 August 19972011: 29 July 2011 to 29 July 20112012: 29 June 2012 to 7 July 20122024: 16 July 2024 to 16 July 202419881997201120122024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Washington, D.C. meeting 40 C (104 F). Long bars mean a long season.
First to last qualifying date each year in Washington, D.C.
YearFirst dateLast date
19881988-07-161988-07-16
19971997-08-171997-08-17
20112011-07-292011-07-29
20122012-06-292012-07-07
20242024-07-162024-07-16

Every Year

Days at or above 40 C (104 F) per year in Washington, D.C.
YearDaysFirst dateLast dateLongest streak in yearCoverage
2024116 July 202416 July 20241 daysComplete
2012229 June 20127 July 20121 daysComplete
2011129 July 201129 July 20111 daysComplete
1997117 August 199717 August 19971 daysComplete
1988116 July 198816 July 19881 daysComplete
Decade averages for Days at or above 40 C (104 F) in Washington, D.C.
DecadeAverage days per yearYears counted
1980s1.01
1990s1.01
2010s1.52
2020s1.01

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 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).