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Built 2026-10-19 (19 October 2026)

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

Denver has had days with a maximum temperature at or above 100 F (37.8 C) in 22 years, most in 2012 with 13. Days per year, season span, streaks and every date.

Key Facts for Denver

  • Denver has had days with a maximum temperature at or above 100 F (37.8 C) in 22 years, 72 days in all.
  • The most in one year was 13 days in 2012.
  • In 2026, the latest year on file, there were 7 such days.
  • The earliest first date in a year was 11 June 2022.
  • The latest last date in a year was 5 September 2020.
  • The longest run inside a single year was 5 days in 2005.
  • 4 years with under 90 percent of days observed are left out of these rankings.

Days per Year

22 years, 72 days
Days at or above 100 F (37.8 C) per year in Denver Days per year in Denver with a maximum temperature at or above 100 F (37.8 C). The line is the decade average. The most was 13 in 2012. Grey bars are years with under 90 percent of days observed, left out of rankings. 0510151998: 12000: 12001: 12002: 12003: 32005: 72006: 42007: 32008: 32010: 12012: 132014: 12016: 12017: 22018: 22019: 22020: 22021: 52022: 52024: 62025: 12026: 7199820122025
Days per year in Denver with a maximum temperature at or above 100 F (37.8 C). The line is the decade average. The most was 13 in 2012. 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 Denver
YearDaysDecade average
199811
200012.9
200112.9
200212.9
200332.9
200572.9
200642.9
200732.9
200832.9
201013.1
2012133.1
201413.1
201613.1
201723.1
201823.1
201923.1
202024.3
202154.3
202254.3
202464.3
202514.3
202674.3

Season Span

earliest 11 June, latest 5 September
First to last qualifying date each year in Denver For each year, a bar from the first to the last day in Denver meeting 100 F (37.8 C). Long bars mean a long season. 1998: 20 July 1998 to 20 July 19982000: 6 July 2000 to 6 July 20002001: 1 July 2001 to 1 July 20012002: 16 August 2002 to 16 August 20022003: 13 July 2003 to 24 July 20032005: 16 July 2005 to 30 July 20052006: 14 June 2006 to 19 July 20062007: 24 June 2007 to 17 July 20072008: 20 July 2008 to 2 August 20082010: 17 July 2010 to 17 July 20102012: 18 June 2012 to 23 July 20122014: 7 July 2014 to 7 July 20142016: 10 July 2016 to 10 July 20162017: 6 July 2017 to 19 July 20172018: 27 June 2018 to 28 June 20182019: 19 July 2019 to 2 September 20192020: 18 August 2020 to 5 September 20202021: 15 June 2021 to 28 July 20212022: 11 June 2022 to 5 August 20222024: 25 June 2024 to 4 August 20242025: 9 July 2025 to 9 July 20252026: 20 July 2026 to 21 August 202619982002200620102016201920222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Denver meeting 100 F (37.8 C). Long bars mean a long season.
First to last qualifying date each year in Denver
YearFirst dateLast date
19981998-07-201998-07-20
20002000-07-062000-07-06
20012001-07-012001-07-01
20022002-08-162002-08-16
20032003-07-132003-07-24
20052005-07-162005-07-30
20062006-06-142006-07-19
20072007-06-242007-07-17
20082008-07-202008-08-02
20102010-07-172010-07-17
20122012-06-182012-07-23
20142014-07-072014-07-07
20162016-07-102016-07-10
20172017-07-062017-07-19
20182018-06-272018-06-28
20192019-07-192019-09-02
20202020-08-182020-09-05
20212021-06-152021-07-28
20222022-06-112022-08-05
20242024-06-252024-08-04
20252025-07-092025-07-09
20262026-07-202026-08-21

Every Year

Days at or above 100 F (37.8 C) per year in Denver
YearDaysFirst dateLast dateLongest streak in yearCoverage
2026720 July 202621 August 20262 daysIncomplete, not ranked
202519 July 20259 July 20251 daysComplete
2024625 June 20244 August 20241 daysComplete
2022511 June 20225 August 20222 daysComplete
2021515 June 202128 July 20213 daysComplete
2020218 August 20205 September 20201 daysComplete
2019219 July 20192 September 20191 daysComplete
2018227 June 201828 June 20182 daysComplete
201726 July 201719 July 20171 daysComplete
2016110 July 201610 July 20161 daysComplete
201417 July 20147 July 20141 daysComplete
20121318 June 201223 July 20125 daysComplete
2010117 July 201017 July 20101 daysComplete
2008320 July 20082 August 20082 daysComplete
2007324 June 200717 July 20071 daysComplete
2006414 June 200619 July 20062 daysComplete
2005716 July 200530 July 20055 daysComplete
2003313 July 200324 July 20031 daysComplete
2002116 August 200216 August 20021 daysComplete
200111 July 20011 July 20011 daysComplete
200016 July 20006 July 20001 daysComplete
1998120 July 199820 July 19981 daysComplete
Decade averages for Days at or above 100 F (37.8 C) in Denver
DecadeAverage days per yearYears counted
1990s1.01
2000s2.98
2010s3.17
2020s3.85

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 Denver, 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).