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Built 2026-10-19 (19 October 2026)

Thermopolis 21WNW Threshold Days by Year (USC00488888)

16 fixed thresholds counted per year at Thermopolis 21WNW (USC00488888): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Thermopolis 21WNW Thresholds

  • Thermopolis 21WNW: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1992 with 15.
  • Thermopolis 21WNW: days with 10 cm (3.9 in) or more of snowfall in 38 years, most in 1970 with 11.
  • Thermopolis 21WNW: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1998 with 4.
  • Thermopolis 21WNW: days with a maximum temperature at or above 30 C (86 F) in 28 years, most in 2000 with 55.
  • 16 fixed thresholds have at least one qualifying day at Thermopolis 21WNW.
28 years with a qualifying day
Days at or above 30 C (86 F) per year at Thermopolis 21WNW Days per year at Thermopolis 21WNW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 55 in 2000. 02040601958: 171959: 381960: 401961: 361962: 71963: 161964: 231965: 111966: 331967: 71968: 71969: 261970: 281974: 251987: 41988: 381991: 51992: 21995: 221998: 272000: 552001: 552002: 502003: 522005: 352008: 432010: 302011: 471958196119641967197019881995200120052011
Days per year at Thermopolis 21WNW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 55 in 2000.
Days at or above 30 C (86 F) per year at Thermopolis 21WNW
YearDaysDecade average
19581727.5
19593827.5
19604020.6
19613620.6
1962720.6
19631620.6
19642320.6
19651120.6
19663320.6
1967720.6
1968720.6
19692620.6
19702826.5
19742526.5
1987421
19883821
1991514
1992214
19952214
19982714
20005548.3
20015548.3
20025048.3
20035248.3
20053548.3
20084348.3
20103038.5
20114738.5
First to last qualifying date each year at Thermopolis 21WNW For each year, a bar from the first to the last day at Thermopolis 21WNW meeting 30 C (86 F). 1958: 27 June 1958 to 8 September 19581959: 6 June 1959 to 13 September 19591960: 3 June 1960 to 5 September 19601961: 17 June 1961 to 28 August 19611962: 26 June 1962 to 16 August 19621963: 5 July 1963 to 12 September 19631964: 4 July 1964 to 18 August 19641965: 15 July 1965 to 13 August 19651966: 27 June 1966 to 23 September 19661967: 21 July 1967 to 10 September 19671968: 14 July 1968 to 6 August 19681969: 5 June 1969 to 18 September 19691970: 24 June 1970 to 31 August 19701974: 13 June 1974 to 9 September 19741987: 15 July 1987 to 4 August 19871988: 4 June 1988 to 7 September 19881991: 6 July 1991 to 2 September 19911992: 8 August 1992 to 15 August 19921995: 7 July 1995 to 3 September 19951998: 4 July 1998 to 7 September 19982000: 5 June 2000 to 18 September 20002001: 13 May 2001 to 25 September 20012002: 30 May 2002 to 17 September 20022003: 28 May 2003 to 6 September 20032005: 21 June 2005 to 29 August 20052008: 17 June 2008 to 17 September 20082010: 25 June 2010 to 3 October 20102011: 28 June 2011 to 25 September 20111958196219661970199120002005JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Thermopolis 21WNW meeting 30 C (86 F).
First to last qualifying date each year at Thermopolis 21WNW
YearFirst dateLast date
19581958-06-271958-09-08
19591959-06-061959-09-13
19601960-06-031960-09-05
19611961-06-171961-08-28
19621962-06-261962-08-16
19631963-07-051963-09-12
19641964-07-041964-08-18
19651965-07-151965-08-13
19661966-06-271966-09-23
19671967-07-211967-09-10
19681968-07-141968-08-06
19691969-06-051969-09-18
19701970-06-241970-08-31
19741974-06-131974-09-09
19871987-07-151987-08-04
19881988-06-041988-09-07
19911991-07-061991-09-02
19921992-08-081992-08-15
19951995-07-071995-09-03
19981998-07-041998-09-07
20002000-06-052000-09-18
20012001-05-132001-09-25
20022002-05-302002-09-17
20032003-05-282003-09-06
20052005-06-212005-08-29
20082008-06-172008-09-17
20102010-06-252010-10-03
20112011-06-282011-09-25

Every Fixed Threshold

Fixed thresholds at Thermopolis 21WNW
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2855200047
35 C (95 F): Days111220032
90 F (32.2 C): Days223520039
100 F (37.8 C): Days1220022
0 C (32 F): Ice days (max2845198832
0 C (32 F): Frost days (min282201959208
-10 C (14 F): Days with min2895198879
-20 C (-4 F): Days with min2826196220
-30 C (-22 F): Days with min12519593
-40 C (-40 F): Days with min1119631
20 C (68 F): Tropical nights (min2120021
10 mm (0.39 in): Days with 10 mm or more rain4315199212
25 mm (0.98 in): Days with 25 mm or more rain31419984
50 mm (1.97 in): Days with 50 mm or more rain3119631
10 cm (3.9 in): Days with 10 cm or more snowfall381119706
25 cm (9.8 in): Days with 25 cm or more snowfall11119651

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1958.

Download the Data

  • Data for Thermopolis 21WNW 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 (2025-12-31).