Dillon U of Montana Western Threshold Days by Year (USC00242409)

16 fixed thresholds counted per year at Dillon U of Montana Western (USC00242409): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dillon U of Montana Western Thresholds

Dillon U of Montana Western: days with 10 mm (0.39 in) or more of precipitation in 127 years, most in 1925 with 24.
Dillon U of Montana Western: nights with a minimum temperature at or below 0 C (32 F) in 125 years, most in 1911 with 235.
Dillon U of Montana Western: nights with a minimum temperature at or below -10 C (14 F) in 125 years, most in 1955 with 89.
Dillon U of Montana Western: nights with a minimum temperature at or below -20 C (-4 F) in 122 years, most in 1949 with 31.
16 fixed thresholds have at least one qualifying day at Dillon U of Montana Western.

Days at or above 30 C (86 F)

106 years with a qualifying day

Days per year at Dillon U of Montana Western with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 52 in 2021.

Days at or above 30 C (86 F) per year at Dillon U of Montana Western
Year	Days	Decade average
1900	24	15.1
1901	27	15.1
1902	10	15.1
1903	6	15.1
1904	13	15.1
1905	8	15.1
1906	17	15.1
1908	19	15.1
1909	12	15.1
1910	33	21.8
1911	19	21.8
1912	17	21.8
1913	9	21.8
1914	25	21.8
1915	13	21.8
1916	17	21.8
1917	25	21.8
1918	20	21.8
1919	40	21.8
1920	12	16.9
1921	15	16.9
1922	5	16.9
1923	15	16.9
1924	16	16.9
1925	17	16.9
1926	23	16.9
1927	13	16.9
1928	16	16.9
1929	37	16.9
1930	20	29.4
1931	40	29.4
1932	29	29.4
1933	42	29.4
1934	38	29.4
1935	19	29.4
1937	38	29.4
1938	14	29.4
1939	25	29.4
1940	45	26.1
1941	18	26.1
1942	30	26.1
1943	22	26.1
1944	10	26.1
1945	25	26.1
1946	27	26.1
1947	30	26.1
1948	24	26.1
1949	30	26.1
1950	23	31.9
1951	28	31.9
1952	33	31.9
1953	45	31.9
1954	34	31.9
1955	40	31.9
1956	22	31.9
1957	33	31.9
1958	24	31.9
1959	37	31.9
1960	30	26.6
1961	39	26.6
1962	9	26.6
1963	23	26.6
1964	21	26.6
1965	9	26.6
1966	34	26.6
1967	31	26.6
1968	29	26.6
1969	41	26.6
1970	48	31.1
1972	25	31.1
1973	29	31.1
1974	44	31.1
1975	21	31.1
1976	23	31.1
1977	30	31.1
1978	23	31.1
1979	37	31.1
1980	19	28.3
1981	46	28.3
1982	20	28.3
1983	18	28.3
1984	29	28.3
1985	33	28.3
1986	39	28.3
1987	25	28.3
1989	26	28.3
1991	43	26
1992	32	26
1993	3	26
2010	19	33.5
2011	24	33.5
2012	50	33.5
2013	48	33.5
2014	26	33.5
2015	28	33.5
2016	37	33.5
2017	44	33.5
2018	35	33.5
2019	24	33.5
2020	38	33.6
2021	52	33.6
2022	35	33.6
2023	22	33.6
2024	32	33.6
2025	23	33.6
2026	33	33.6

For each year, a bar from the first to the last day at Dillon U of Montana Western meeting 30 C (86 F).

First to last qualifying date each year at Dillon U of Montana Western
Year	First date	Last date
1900	1900-06-07	1900-09-12
1901	1901-05-17	1901-08-25
1902	1902-06-09	1902-08-06
1903	1903-08-15	1903-09-02
1904	1904-07-12	1904-09-06
1905	1905-07-10	1905-08-29
1906	1906-06-12	1906-10-02
1908	1908-07-03	1908-08-09
1909	1909-06-05	1909-08-19
1910	1910-05-31	1910-08-22
1911	1911-06-12	1911-10-08
1912	1912-06-03	1912-08-28
1913	1913-07-06	1913-08-31
1914	1914-06-18	1914-08-30
1915	1915-07-19	1915-08-31
1916	1916-06-15	1916-08-27
1917	1917-07-02	1917-08-30
1918	1918-06-09	1918-08-01
1919	1919-05-27	1919-08-27
1920	1920-07-19	1920-08-16
1921	1921-07-08	1921-07-31
1922	1922-06-26	1922-08-01
1923	1923-07-12	1923-09-04
1924	1924-07-01	1924-08-30
1925	1925-06-26	1925-08-22
1926	1926-06-26	1926-08-26
1927	1927-06-25	1927-07-29
1928	1928-07-12	1928-08-12
1929	1929-07-02	1929-09-01
1930	1930-06-10	1930-08-13
1931	1931-06-16	1931-09-08
1932	1932-06-22	1932-08-20
1933	1933-06-14	1933-09-05
1934	1934-05-28	1934-09-03
1935	1935-06-22	1935-08-14
1937	1937-06-21	1937-09-17
1938	1938-07-11	1938-09-22
1939	1939-07-08	1939-09-21
1940	1940-06-12	1940-08-31
1941	1941-06-22	1941-08-10
1942	1942-07-02	1942-09-06
1943	1943-07-06	1943-08-29
1944	1944-06-30	1944-09-07
1945	1945-06-21	1945-09-03
1946	1946-07-12	1946-09-14
1947	1947-07-02	1947-09-06
1948	1948-06-07	1948-09-13
1949	1949-06-09	1949-09-01
1950	1950-06-29	1950-09-05
1951	1951-06-15	1951-08-19
1952	1952-06-05	1952-09-26
1953	1953-06-11	1953-09-15
1954	1954-05-18	1954-09-01
1955	1955-06-21	1955-09-07
1956	1956-06-10	1956-09-19
1957	1957-06-03	1957-09-07
1958	1958-06-23	1958-09-08
1959	1959-06-12	1959-09-13
1960	1960-07-01	1960-08-21
1961	1961-06-16	1961-08-22
1962	1962-06-25	1962-08-15
1963	1963-07-02	1963-09-26
1964	1964-07-08	1964-08-18
1965	1965-07-15	1965-08-11
1966	1966-05-27	1966-09-22
1967	1967-07-02	1967-09-29
1968	1968-06-19	1968-09-10
1969	1969-06-04	1969-09-02
1970	1970-06-05	1970-08-29
1972	1972-05-30	1972-08-29
1973	1973-06-22	1973-08-20
1974	1974-06-12	1974-09-09
1975	1975-07-02	1975-08-11
1976	1976-06-09	1976-09-06
1977	1977-06-01	1977-09-07
1978	1978-07-14	1978-09-04
1979	1979-06-11	1979-09-16
1980	1980-06-18	1980-09-06
1981	1981-06-26	1981-09-18
1982	1982-07-13	1982-09-03
1983	1983-05-27	1983-08-14
1984	1984-05-29	1984-09-19
1985	1985-06-07	1985-08-29
1986	1986-05-26	1986-08-29
1987	1987-05-08	1987-09-23
1989	1989-06-19	1989-08-11
1991	1991-06-11	1991-09-06
1992	1992-05-06	1992-10-01
1993	1993-06-20	1993-06-26
2010	2010-06-28	2010-08-26
2011	2011-07-03	2011-09-11
2012	2012-06-04	2012-08-29
2013	2013-06-10	2013-09-02
2014	2014-07-02	2014-08-18
2015	2015-06-08	2015-09-12
2016	2016-06-04	2016-09-01
2017	2017-06-19	2017-09-12
2018	2018-06-04	2018-09-07
2019	2019-07-11	2019-09-05
2020	2020-05-30	2020-09-14
2021	2021-06-02	2021-09-09
2022	2022-06-17	2022-09-07
2023	2023-07-02	2023-08-18
2024	2024-06-22	2024-09-05
2025	2025-05-31	2025-09-03
2026	2026-07-03	2026-08-22

Every Fixed Threshold

Fixed thresholds at Dillon U of Montana Western
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	106	52	2021	33
35 C (95 F): Days	33	6	1985	3
90 F (32.2 C): Days	95	26	2012	10
100 F (37.8 C): Days	1	1	1940	1
0 C (32 F): Ice days (max	107	67	1955	8
0 C (32 F): Frost days (min	125	235	1911	114
-10 C (14 F): Days with min	125	89	1955	18
-20 C (-4 F): Days with min	122	31	1949	12
-30 C (-22 F): Days with min	72	10	1949	4
-40 C (-40 F): Days with min	2	1	1933	1
20 C (68 F): Tropical nights (min	5	3	1909	1
10 mm (0.39 in): Days with 10 mm or more rain	127	24	1925	6
25 mm (0.98 in): Days with 25 mm or more rain	74	7	1909	2
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1901	1
10 cm (3.9 in): Days with 10 cm or more snowfall	67	12	1919	2
25 cm (9.8 in): Days with 25 cm or more snowfall	16	3	1909	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.

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Data for Dillon U of Montana Western 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).

Dillon U of Montana Western Threshold Days by Year (USC00242409)

Key Facts for Dillon U of Montana Western Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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