Thermopolis Threshold Days by Year (USC00488875)

18 fixed thresholds counted per year at Thermopolis (USC00488875): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Thermopolis Thresholds

Thermopolis: days with a maximum temperature at or above 30 C (86 F) in 77 years, most in 2001 with 99.
Thermopolis: days with a maximum temperature at or above 35 C (95 F) in 77 years, most in 1936 with 50.
Thermopolis: days with a maximum temperature at or above 90 F (32.2 C) in 77 years, most in 1936 with 78.
Thermopolis: days with a maximum temperature at or below 0 C (32 F) in 77 years, most in 1922 with 60.
18 fixed thresholds have at least one qualifying day at Thermopolis.

Days at or above 30 C (86 F)

77 years with a qualifying day

Days per year at Thermopolis with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 99 in 2001.

Days at or above 30 C (86 F) per year at Thermopolis
Year	Days	Decade average
1900	75	69.3
1908	61	69.3
1909	72	69.3
1910	79	61.4
1911	69	61.4
1912	44	61.4
1913	62	61.4
1914	40	61.4
1915	39	61.4
1916	75	61.4
1917	83	61.4
1922	89	66.9
1923	73	66.9
1924	67	66.9
1925	67	66.9
1926	60	66.9
1927	48	66.9
1928	64	66.9
1930	25	76
1931	73	76
1932	79	76
1933	90	76
1934	86	76
1935	70	76
1936	98	76
1937	78	76
1938	77	76
1939	84	76
1940	85	68
1941	57	68
1949	62	68
1950	49	70.9
1951	48	70.9
1952	74	70.9
1953	84	70.9
1954	84	70.9
1955	81	70.9
1958	74	70.9
1959	73	70.9
1961	78	69.7
1962	59	69.7
1963	72	69.7
1991	67	68.3
1992	62	68.3
1993	36	68.3
1994	85	68.3
1995	66	68.3
1996	82	68.3
1997	73	68.3
1998	75	68.3
1999	69	68.3
2000	91	77.6
2001	99	77.6
2002	81	77.6
2003	78	77.6
2004	58	77.6
2005	77	77.6
2006	90	77.6
2008	62	77.6
2009	62	77.6
2010	71	78.6
2011	82	78.6
2012	96	78.6
2013	89	78.6
2014	60	78.6
2015	86	78.6
2016	80	78.6
2017	73	78.6
2018	81	78.6
2019	68	78.6
2020	97	85.4
2021	90	85.4
2022	88	85.4
2023	66	85.4
2024	83	85.4
2025	91	85.4
2026	83	85.4

For each year, a bar from the first to the last day at Thermopolis meeting 30 C (86 F).

First to last qualifying date each year at Thermopolis
Year	First date	Last date
1900	1900-05-10	1900-09-09
1908	1908-06-24	1908-09-22
1909	1909-06-03	1909-09-28
1910	1910-04-26	1910-10-10
1911	1911-05-05	1911-09-15
1912	1912-06-02	1912-09-03
1913	1913-05-26	1913-09-18
1914	1914-06-02	1914-09-26
1915	1915-05-13	1915-09-23
1916	1916-05-06	1916-09-22
1917	1917-05-15	1917-10-04
1922	1922-05-24	1922-10-03
1923	1923-05-26	1923-09-14
1924	1924-06-14	1924-09-15
1925	1925-05-19	1925-09-16
1926	1926-05-22	1926-09-10
1927	1927-05-16	1927-09-10
1928	1928-05-22	1928-10-08
1930	1930-05-27	1930-08-25
1931	1931-06-08	1931-09-19
1932	1932-05-22	1932-09-19
1933	1933-05-31	1933-09-30
1934	1934-05-06	1934-09-19
1935	1935-06-13	1935-09-23
1936	1936-05-12	1936-09-25
1937	1937-05-15	1937-09-21
1938	1938-05-01	1938-09-30
1939	1939-04-28	1939-09-27
1940	1940-05-08	1940-10-18
1941	1941-05-12	1941-09-17
1949	1949-06-10	1949-09-24
1950	1950-06-06	1950-09-06
1951	1951-05-23	1951-09-10
1952	1952-05-03	1952-09-29
1953	1953-05-26	1953-10-10
1954	1954-05-19	1954-09-27
1955	1955-05-20	1955-09-14
1958	1958-05-19	1958-10-06
1959	1959-06-04	1959-09-15
1961	1961-05-10	1961-09-16
1962	1962-05-10	1962-09-19
1963	1963-06-13	1963-10-04
1991	1991-06-11	1991-09-07
1992	1992-05-06	1992-10-03
1993	1993-06-20	1993-10-06
1994	1994-05-16	1994-09-29
1995	1995-06-12	1995-09-16
1996	1996-05-13	1996-09-13
1997	1997-05-31	1997-09-15
1998	1998-05-30	1998-09-19
1999	1999-06-19	1999-09-18
2000	2000-05-04	2000-09-19
2001	2001-05-12	2001-10-02
2002	2002-05-30	2002-09-17
2003	2003-05-25	2003-10-19
2004	2004-05-05	2004-09-19
2005	2005-05-20	2005-10-02
2006	2006-05-18	2006-09-15
2008	2008-05-18	2008-09-26
2009	2009-05-18	2009-09-30
2010	2010-06-21	2010-10-03
2011	2011-06-05	2011-10-03
2012	2012-04-23	2012-10-03
2013	2013-05-13	2013-09-17
2014	2014-05-26	2014-09-27
2015	2015-05-31	2015-10-01
2016	2016-05-05	2016-09-21
2017	2017-05-06	2017-09-13
2018	2018-05-26	2018-09-22
2019	2019-06-06	2019-09-19
2020	2020-05-18	2020-10-08
2021	2021-05-18	2021-10-05
2022	2022-06-10	2022-09-27
2023	2023-05-22	2023-10-02
2024	2024-05-28	2024-10-10
2025	2025-05-10	2025-10-03
2026	2026-04-21	2026-10-09

Every Fixed Threshold

Fixed thresholds at Thermopolis
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	77	99	2001	83
35 C (95 F): Days	77	50	1936	33
40 C (104 F): Days	18	5	2006	3
90 F (32.2 C): Days	77	78	1936	62
100 F (37.8 C): Days	63	19	1936	11
0 C (32 F): Ice days (max	77	60	1922	7
0 C (32 F): Frost days (min	77	215	1916	81
-10 C (14 F): Days with min	77	103	1955	21
-20 C (-4 F): Days with min	75	48	1916	2
-30 C (-22 F): Days with min	41	10	1916	2
-40 C (-40 F): Days with min	2	1	1933	1
20 C (68 F): Tropical nights (min	43	12	1949	6
25 C (77 F): Days with min	1	1	2023	1
10 mm (0.39 in): Days with 10 mm or more rain	66	17	1941	2
25 mm (0.98 in): Days with 25 mm or more rain	40	5	1908	1
50 mm (1.97 in): Days with 50 mm or more rain	5	1	1908	1
10 cm (3.9 in): Days with 10 cm or more snowfall	50	9	1955	2
25 cm (9.8 in): Days with 25 cm or more snowfall	10	2	1954	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

Data for Thermopolis 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Thermopolis Threshold Days by Year (USC00488875)

Key Facts for Thermopolis Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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