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Built 2026-10-19 (19 October 2026)

Fossil Butte Threshold Days by Year (USC00483582)

14 fixed thresholds counted per year at Fossil Butte (USC00483582): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Fossil Butte Thresholds

  • Fossil Butte: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 2023 with 99.
  • Fossil Butte: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 1993 with 259.
  • Fossil Butte: nights with a minimum temperature at or below -10 C (14 F) in 33 years, most in 2023 with 120.
  • Fossil Butte: nights with a minimum temperature at or below -20 C (-4 F) in 33 years, most in 2019 with 38.
  • 14 fixed thresholds have at least one qualifying day at Fossil Butte.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Fossil Butte Days per year at Fossil Butte with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 2022. 02040601991: 101994: 391995: 111996: 101997: 82000: 302001: 312002: 332003: 442004: 162005: 212006: 262007: 472008: 292009: 172010: 292011: 162012: 492013: 442014: 192015: 232016: 302017: 342018: 342019: 262020: 432021: 492022: 502023: 152024: 312025: 422026: 4519911997200320072011201520192023
Days per year at Fossil Butte with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 2022.
Days at or above 30 C (86 F) per year at Fossil Butte
YearDaysDecade average
19911015.6
19943915.6
19951115.6
19961015.6
1997815.6
20003029.4
20013129.4
20023329.4
20034429.4
20041629.4
20052129.4
20062629.4
20074729.4
20082929.4
20091729.4
20102930.4
20111630.4
20124930.4
20134430.4
20141930.4
20152330.4
20163030.4
20173430.4
20183430.4
20192630.4
20204339.3
20214939.3
20225039.3
20231539.3
20243139.3
20254239.3
20264539.3
First to last qualifying date each year at Fossil Butte For each year, a bar from the first to the last day at Fossil Butte meeting 30 C (86 F). 1991: 6 July 1991 to 11 August 19911994: 21 June 1994 to 27 August 19941995: 8 July 1995 to 1 September 19951996: 2 July 1996 to 31 August 19961997: 15 July 1997 to 30 August 19972000: 5 June 2000 to 15 August 20002001: 22 June 2001 to 5 September 20012002: 1 June 2002 to 19 August 20022003: 28 May 2003 to 26 August 20032004: 12 July 2004 to 1 September 20042005: 21 June 2005 to 7 September 20052006: 6 June 2006 to 23 August 20062007: 16 June 2007 to 30 August 20072008: 3 July 2008 to 31 August 20082009: 17 July 2009 to 23 August 20092010: 29 June 2010 to 4 September 20102011: 3 July 2011 to 28 August 20112012: 4 June 2012 to 30 August 20122013: 10 June 2013 to 5 September 20132014: 3 July 2014 to 28 July 20142015: 24 June 2015 to 29 August 20152016: 20 June 2016 to 31 August 20162017: 20 June 2017 to 5 September 20172018: 27 June 2018 to 13 August 20182019: 11 July 2019 to 5 September 20192020: 5 June 2020 to 7 September 20202021: 4 June 2021 to 10 September 20212022: 17 June 2022 to 9 September 20222023: 16 July 2023 to 17 August 20232024: 14 June 2024 to 11 August 20242025: 15 June 2025 to 4 September 20252026: 24 June 2026 to 27 August 202619911997200320072011201520192023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Fossil Butte meeting 30 C (86 F).
First to last qualifying date each year at Fossil Butte
YearFirst dateLast date
19911991-07-061991-08-11
19941994-06-211994-08-27
19951995-07-081995-09-01
19961996-07-021996-08-31
19971997-07-151997-08-30
20002000-06-052000-08-15
20012001-06-222001-09-05
20022002-06-012002-08-19
20032003-05-282003-08-26
20042004-07-122004-09-01
20052005-06-212005-09-07
20062006-06-062006-08-23
20072007-06-162007-08-30
20082008-07-032008-08-31
20092009-07-172009-08-23
20102010-06-292010-09-04
20112011-07-032011-08-28
20122012-06-042012-08-30
20132013-06-102013-09-05
20142014-07-032014-07-28
20152015-06-242015-08-29
20162016-06-202016-08-31
20172017-06-202017-09-05
20182018-06-272018-08-13
20192019-07-112019-09-05
20202020-06-052020-09-07
20212021-06-042021-09-10
20222022-06-172022-09-09
20232023-07-162023-08-17
20242024-06-142024-08-11
20252025-06-152025-09-04
20262026-06-242026-08-27

Every Fixed Threshold

Fixed thresholds at Fossil Butte
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3250202245
35 C (95 F): Days8520039
90 F (32.2 C): Days3023200326
100 F (37.8 C): Days1120001
0 C (32 F): Ice days (max3399202312
0 C (32 F): Frost days (min332591993158
-10 C (14 F): Days with min33120202335
-20 C (-4 F): Days with min333820192
-30 C (-22 F): Days with min28419971
-40 C (-40 F): Days with min1120051
10 mm (0.39 in): Days with 10 mm or more rain3113201710
25 mm (0.98 in): Days with 25 mm or more rain11320171
10 cm (3.9 in): Days with 10 cm or more snowfall311120053
25 cm (9.8 in): Days with 25 cm or more snowfall4320233

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • Data for Fossil Butte 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).