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Built 2026-10-19 (19 October 2026)

Days at or above 30 C (86 F) in Denver

Denver has had days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 2020 with 101. Days per year, season span, streaks and every date.

Key Facts for Denver

  • Denver has had days with a maximum temperature at or above 30 C (86 F) in 30 years, 2,210 days in all.
  • The most in one year was 101 days in 2020.
  • In 2026, the latest year on file, there were 94 such days.
  • The earliest first date in a year was 12 April 2025.
  • The latest last date in a year was 20 October 2023.
  • The longest run inside a single year was 31 days in 2005.
  • 4 years with under 90 percent of days observed are left out of these rankings.

Days per Year

30 years, 2,210 days
Days at or above 30 C (86 F) per year in Denver Days per year in Denver with a maximum temperature at or above 30 C (86 F). The line is the decade average. The most was 101 in 2020. Grey bars are years with under 90 percent of days observed, left out of rankings. 0501001501996: 661997: 551998: 581999: 442000: 852001: 752002: 772003: 612004: 442005: 892006: 752007: 772008: 702009: 492010: 802011: 822012: 912014: 562015: 742016: 742017: 802018: 852019: 742020: 1012021: 832022: 902023: 582024: 962025: 672026: 94199620062017
Days per year in Denver with a maximum temperature at or above 30 C (86 F). The line is the decade average. The most was 101 in 2020. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days at or above 30 C (86 F) per year in Denver
YearDaysDecade average
19966655.8
19975555.8
19985855.8
19994455.8
20008570.2
20017570.2
20027770.2
20036170.2
20044470.2
20058970.2
20067570.2
20077770.2
20087070.2
20094970.2
20108077.3
20118277.3
20129177.3
20145677.3
20157477.3
20167477.3
20178077.3
20188577.3
20197477.3
202010184.1
20218384.1
20229084.1
20235884.1
20249684.1
20256784.1
20269484.1

Season Span

earliest 12 April, latest 20 October
First to last qualifying date each year in Denver For each year, a bar from the first to the last day in Denver meeting 30 C (86 F). Long bars mean a long season. 1996: 14 May 1996 to 10 September 19961997: 17 May 1997 to 5 October 19971998: 28 May 1998 to 28 September 19981999: 8 June 1999 to 25 September 19992000: 4 May 2000 to 17 September 20002001: 2 June 2001 to 28 September 20012002: 21 May 2002 to 16 September 20022003: 29 May 2003 to 19 October 20032004: 5 May 2004 to 18 September 20042005: 20 May 2005 to 3 October 20052006: 18 May 2006 to 14 September 20062007: 10 June 2007 to 6 October 20072008: 18 May 2008 to 28 September 20082009: 18 May 2009 to 29 September 20092010: 22 May 2010 to 28 September 20102011: 7 May 2011 to 1 October 20112012: 24 April 2012 to 23 September 20122014: 28 May 2014 to 27 September 20142015: 2 June 2015 to 11 October 20152016: 9 June 2016 to 16 October 20162017: 6 May 2017 to 22 September 20172018: 10 May 2018 to 3 October 20182019: 7 June 2019 to 29 September 20192020: 18 May 2020 to 10 October 20202021: 1 May 2021 to 27 September 20212022: 22 April 2022 to 28 September 20222023: 19 June 2023 to 20 October 20232024: 2 June 2024 to 5 October 20242025: 12 April 2025 to 3 October 20252026: 21 March 2026 to 9 October 202619962000200420082012201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Denver meeting 30 C (86 F). Long bars mean a long season.
First to last qualifying date each year in Denver
YearFirst dateLast date
19961996-05-141996-09-10
19971997-05-171997-10-05
19981998-05-281998-09-28
19991999-06-081999-09-25
20002000-05-042000-09-17
20012001-06-022001-09-28
20022002-05-212002-09-16
20032003-05-292003-10-19
20042004-05-052004-09-18
20052005-05-202005-10-03
20062006-05-182006-09-14
20072007-06-102007-10-06
20082008-05-182008-09-28
20092009-05-182009-09-29
20102010-05-222010-09-28
20112011-05-072011-10-01
20122012-04-242012-09-23
20142014-05-282014-09-27
20152015-06-022015-10-11
20162016-06-092016-10-16
20172017-05-062017-09-22
20182018-05-102018-10-03
20192019-06-072019-09-29
20202020-05-182020-10-10
20212021-05-012021-09-27
20222022-04-222022-09-28
20232023-06-192023-10-20
20242024-06-022024-10-05
20252025-04-122025-10-03
20262026-03-212026-10-09

Every Year

Days at or above 30 C (86 F) per year in Denver
YearDaysFirst dateLast dateLongest streak in yearCoverage
20269421 March 20269 October 202639 daysIncomplete, not ranked
20256712 April 20253 October 202515 daysComplete
2024962 June 20245 October 202424 daysComplete
20235819 June 202320 October 202315 daysComplete
20229022 April 202228 September 202216 daysComplete
2021831 May 202127 September 202116 daysComplete
202010118 May 202010 October 202028 daysComplete
2019747 June 201929 September 201930 daysComplete
20188510 May 20183 October 201814 daysComplete
2017806 May 201722 September 201719 daysComplete
2016749 June 201616 October 201625 daysComplete
2015742 June 201511 October 201518 daysComplete
20145628 May 201427 September 20149 daysComplete
20129124 April 201223 September 201224 daysComplete
2011827 May 20111 October 201131 daysComplete
20108022 May 201028 September 201010 daysComplete
20094918 May 200929 September 20096 daysComplete
20087018 May 200828 September 200825 daysComplete
20077710 June 20076 October 200715 daysComplete
20067518 May 200614 September 200622 daysComplete
20058920 May 20053 October 200531 daysComplete
2004445 May 200418 September 20049 daysComplete
20036129 May 200319 October 200320 daysComplete
20027721 May 200216 September 200215 daysComplete
2001752 June 200128 September 200120 daysComplete
2000854 May 200017 September 200025 daysComplete
1999448 June 199925 September 19999 daysComplete
19985828 May 199828 September 199811 daysComplete
19975517 May 19975 October 19979 daysComplete
19966614 May 199610 September 19967 daysComplete
Decade averages for Days at or above 30 C (86 F) in Denver
DecadeAverage days per yearYears counted
1990s55.84
2000s70.210
2010s77.39
2020s82.56

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 30 C (86 F) 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).