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Built 2026-10-16 (16 October 2026)

Casper Mountain Wyoming Threshold Days by Year

9 fixed thresholds counted per year at Casper Mountain Wyoming (USR0000WCAS): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Casper Mountain Wyoming Thresholds

  • Casper Mountain Wyoming: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 2023 with 95.
  • Casper Mountain Wyoming: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 2002 with 219.
  • Casper Mountain Wyoming: nights with a minimum temperature at or below -10 C (14 F) in 33 years, most in 2020 with 89.
  • Casper Mountain Wyoming: nights with a minimum temperature at or below -20 C (-4 F) in 32 years, most in 1996 with 17.
  • 9 fixed thresholds have at least one qualifying day at Casper Mountain Wyoming.
31 years with a qualifying day
Days at or above 30 C (86 F) per year at Casper Mountain Wyoming Days per year at Casper Mountain Wyoming with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 25 in 2012. 01020301995: 31996: 71997: 31998: 81999: 32000: 132001: 162002: 152003: 242004: 42005: 132006: 152007: 232008: 112009: 22010: 52011: 122012: 252014: 102015: 62016: 82017: 82018: 92019: 82020: 112021: 142022: 182023: 52024: 82025: 82026: 2019951999200320072011201620202024
Days per year at Casper Mountain Wyoming with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 25 in 2012.
Days at or above 30 C (86 F) per year at Casper Mountain Wyoming
YearDaysDecade average
199534.8
199674.8
199734.8
199884.8
199934.8
20001313.6
20011613.6
20021513.6
20032413.6
2004413.6
20051313.6
20061513.6
20072313.6
20081113.6
2009213.6
2010510.1
20111210.1
20122510.1
20141010.1
2015610.1
2016810.1
2017810.1
2018910.1
2019810.1
20201112
20211412
20221812
2023512
2024812
2025812
20262012
First to last qualifying date each year at Casper Mountain Wyoming For each year, a bar from the first to the last day at Casper Mountain Wyoming meeting 30 C (86 F). 1995: 28 July 1995 to 6 August 19951996: 2 July 1996 to 14 August 19961997: 15 July 1997 to 17 July 19971998: 13 July 1998 to 5 September 19981999: 24 July 1999 to 26 August 19992000: 13 July 2000 to 13 August 20002001: 30 June 2001 to 4 September 20012002: 28 June 2002 to 24 July 20022003: 12 July 2003 to 21 August 20032004: 12 July 2004 to 18 July 20042005: 21 June 2005 to 8 August 20052006: 7 June 2006 to 22 August 20062007: 23 June 2007 to 2 September 20072008: 30 June 2008 to 25 August 20082009: 18 July 2009 to 22 August 20092010: 16 July 2010 to 1 August 20102011: 24 July 2011 to 28 August 20112012: 23 June 2012 to 28 August 20122014: 5 July 2014 to 12 August 20142015: 26 July 2015 to 25 August 20152016: 21 June 2016 to 17 August 20162017: 5 July 2017 to 3 September 20172018: 6 July 2018 to 12 August 20182019: 13 July 2019 to 5 September 20192020: 12 July 2020 to 5 September 20202021: 4 June 2021 to 10 September 20212022: 8 July 2022 to 7 September 20222023: 17 July 2023 to 16 August 20232024: 11 July 2024 to 6 August 20242025: 1 July 2025 to 20 August 20252026: 5 July 2026 to 21 August 202619951999200320072011201620202024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Casper Mountain Wyoming meeting 30 C (86 F).
First to last qualifying date each year at Casper Mountain Wyoming
YearFirst dateLast date
19951995-07-281995-08-06
19961996-07-021996-08-14
19971997-07-151997-07-17
19981998-07-131998-09-05
19991999-07-241999-08-26
20002000-07-132000-08-13
20012001-06-302001-09-04
20022002-06-282002-07-24
20032003-07-122003-08-21
20042004-07-122004-07-18
20052005-06-212005-08-08
20062006-06-072006-08-22
20072007-06-232007-09-02
20082008-06-302008-08-25
20092009-07-182009-08-22
20102010-07-162010-08-01
20112011-07-242011-08-28
20122012-06-232012-08-28
20142014-07-052014-08-12
20152015-07-262015-08-25
20162016-06-212016-08-17
20172017-07-052017-09-03
20182018-07-062018-08-12
20192019-07-132019-09-05
20202020-07-122020-09-05
20212021-06-042021-09-10
20222022-07-082022-09-07
20232023-07-172023-08-16
20242024-07-112024-08-06
20252025-07-012025-08-20
20262026-07-052026-08-21

Every Fixed Threshold

Fixed thresholds at Casper Mountain Wyoming
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3125201220
35 C (95 F): Days1220072
90 F (32.2 C): Days199200612
0 C (32 F): Ice days (max3395202322
0 C (32 F): Frost days (min332192002114
-10 C (14 F): Days with min3389202024
-20 C (-4 F): Days with min321719963
-30 C (-22 F): Days with min7320113
20 C (68 F): Tropical nights (min5220061

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1995.

Download the Data

  • Data for Casper Mountain Wyoming 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-14).