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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Round Mountain Threshold Days by Year (USR0000CROU)

10 fixed thresholds counted per year at Round Mountain (USR0000CROU): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Round Mountain Thresholds

  • Round Mountain: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 2021 with 70.
  • Round Mountain: days with a maximum temperature at or above 90 F (32.2 C) in 30 years, most in 2021 with 50.
  • Round Mountain: days with a maximum temperature at or below 0 C (32 F) in 30 years, most in 2001 with 47.
  • Round Mountain: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 2011 with 162.
  • 10 fixed thresholds have at least one qualifying day at Round Mountain.
30 years with a qualifying day
Days at or above 30 C (86 F) per year at Round Mountain Days per year at Round Mountain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 70 in 2021. 0204060801992: 261996: 451998: 301999: 122000: 262001: 282002: 352003: 392004: 242005: 272006: 322007: 252008: 302009: 372011: 192012: 452013: 322014: 392015: 312016: 362017: 502018: 432019: 252020: 582021: 702022: 592023: 302024: 452025: 332026: 321992199920022005200820122015201820212024
Days per year at Round Mountain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 70 in 2021.
Days at or above 30 C (86 F) per year at Round Mountain
YearDaysDecade average
19922628.3
19964528.3
19983028.3
19991228.3
20002630.3
20012830.3
20023530.3
20033930.3
20042430.3
20052730.3
20063230.3
20072530.3
20083030.3
20093730.3
20111935.6
20124535.6
20133235.6
20143935.6
20153135.6
20163635.6
20175035.6
20184335.6
20192535.6
20205846.7
20217046.7
20225946.7
20233046.7
20244546.7
20253346.7
20263246.7
First to last qualifying date each year at Round Mountain For each year, a bar from the first to the last day at Round Mountain meeting 30 C (86 F). 1992: 31 May 1992 to 21 September 19921996: 6 June 1996 to 9 October 19961998: 6 July 1998 to 4 September 19981999: 29 June 1999 to 14 September 19992000: 21 May 2000 to 19 September 20002001: 31 May 2001 to 1 October 20012002: 25 June 2002 to 23 September 20022003: 23 May 2003 to 28 September 20032004: 5 July 2004 to 6 September 20042005: 5 July 2005 to 21 August 20052006: 16 May 2006 to 12 September 20062007: 3 July 2007 to 11 September 20072008: 16 May 2008 to 29 September 20082009: 28 June 2009 to 27 September 20092011: 21 June 2011 to 23 September 20112012: 1 June 2012 to 1 October 20122013: 5 June 2013 to 14 September 20132014: 9 June 2014 to 20 September 20142015: 8 June 2015 to 12 September 20152016: 3 June 2016 to 10 September 20162017: 18 June 2017 to 11 September 20172018: 24 June 2018 to 27 September 20182019: 11 June 2019 to 5 September 20192020: 28 May 2020 to 3 October 20202021: 31 May 2021 to 14 September 20212022: 22 June 2022 to 10 September 20222023: 30 June 2023 to 28 August 20232024: 5 June 2024 to 1 October 20242025: 30 May 2025 to 24 September 20252026: 14 June 2026 to 7 October 202619922000200420082013201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Round Mountain meeting 30 C (86 F).
First to last qualifying date each year at Round Mountain
YearFirst dateLast date
19921992-05-311992-09-21
19961996-06-061996-10-09
19981998-07-061998-09-04
19991999-06-291999-09-14
20002000-05-212000-09-19
20012001-05-312001-10-01
20022002-06-252002-09-23
20032003-05-232003-09-28
20042004-07-052004-09-06
20052005-07-052005-08-21
20062006-05-162006-09-12
20072007-07-032007-09-11
20082008-05-162008-09-29
20092009-06-282009-09-27
20112011-06-212011-09-23
20122012-06-012012-10-01
20132013-06-052013-09-14
20142014-06-092014-09-20
20152015-06-082015-09-12
20162016-06-032016-09-10
20172017-06-182017-09-11
20182018-06-242018-09-27
20192019-06-112019-09-05
20202020-05-282020-10-03
20212021-05-312021-09-14
20222022-06-222022-09-10
20232023-06-302023-08-28
20242024-06-052024-10-01
20252025-05-302025-09-24
20262026-06-142026-10-07

Every Fixed Threshold

Fixed thresholds at Round Mountain
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3070202132
35 C (95 F): Days272220212
90 F (32.2 C): Days3050202111
100 F (37.8 C): Days7320221
0 C (32 F): Ice days (max304720013
0 C (32 F): Frost days (min30162201150
-10 C (14 F): Days with min251320131
-20 C (-4 F): Days with min1119981
20 C (68 F): Tropical nights (min271620242
25 C (77 F): Days with min1220222

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1992.

Download the Data

  • Data for Round Mountain 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).