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Data as of 2026-10-12
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Built 2026-10-14 (14 October 2026)

Denver Threshold Days: Hot, Cold and Wet Days per Year

17 fixed thresholds counted per year for Denver: days at or above 30 C and 100 F, frost, tropical nights and heavy rain, with rankings and streaks.

Key Facts for Denver Thresholds

  • Denver: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 2020 with 101.
  • Denver: days with a maximum temperature at or above 35 C (95 F) in 30 years, most in 2012 with 42.
  • Denver: days with a maximum temperature at or above 90 F (32.2 C) in 30 years, most in 2020 with 75.
  • Denver: days with a maximum temperature at or below Ice days (max at or below 0 C) (32 F) in 30 years, most in 2007 with 41.
  • 17 fixed thresholds have at least one qualifying day at Denver.
30 years with a qualifying day
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), with the decade average as a line. The most was 101 in 2020. 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), with the decade average as a line. The most was 101 in 2020.
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
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). 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).
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 Fixed Threshold

Fixed thresholds in Denver
ThresholdYears with a qualifying dayMost days in a yearYearLatest year daysPage
30 C (86 F): Days30101202094Full page
35 C (95 F): Days3042201226Full page
40 C (104 F): Days4320121Too few years
90 F (32.2 C): Days3075202065Full page
100 F (37.8 C): Days221320127Full page
Ice days (max at or below 0 C) (32 F): Ice days (max304120075Full page
Frost days (min at or below 0 C) (32 F): Frost days (min30175200268Full page
-10 C (14 F): Days with min3055200715Full page
-20 C (-4 F): Days with min281120142Full page
-30 C (-22 F): Days with min1120221Too few years
Tropical nights (min at or above 20 C) (68 F): Tropical nights (min28820128Full page
Days with 10 mm or more rain (0.39 in): Days with 10 mm or more rain301619976Full page
Days with 25 mm or more rain (0.98 in): Days with 25 mm or more rain26620111Full page
Days with 50 mm or more rain (1.97 in): Days with 50 mm or more rain6219981Full page
Days with 10 cm or more snowfall (3.9 in): Days with 10 cm or more snowfall18620211Full page
Days with 25 cm or more snowfall (9.8 in): Days with 25 cm or more snowfall4220161Too few years
Days with 50 cm or more snowfall (19.7 in): Days with 50 cm or more snowfall1120211Too few years

A full page with streaks and every date exists for thresholds with at least 5 qualifying years. Years with under 90 percent of days observed are left out of the most days column.

Download the Data

  • Data for Denver threshold days 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 2026-10-12 (12 October 2026). Threshold counts are computed by this site from the threaded city record.

Data as of . Last revised (2026-10-12).