Miles City AP Threshold Days by Year (USW00024037)

19 fixed thresholds counted per year at Miles City AP (USW00024037): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Miles City AP Thresholds

Miles City AP: days with a maximum temperature at or above 30 C (86 F) in 90 years, most in 2021 with 82.
Miles City AP: days with a maximum temperature at or above 35 C (95 F) in 90 years, most in 1988 with 42.
Miles City AP: days with a maximum temperature at or above 90 F (32.2 C) in 90 years, most in 2021 with 62.
Miles City AP: days with a maximum temperature at or below 0 C (32 F) in 90 years, most in 1978 with 102.
19 fixed thresholds have at least one qualifying day at Miles City AP.

Days at or above 30 C (86 F)

90 years with a qualifying day

Days per year at Miles City AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 82 in 2021.

Days at or above 30 C (86 F) per year at Miles City AP
Year	Days	Decade average
1937	78	71.3
1938	65	71.3
1939	71	71.3
1940	71	53.7
1941	57	53.7
1942	42	53.7
1943	52	53.7
1944	36	53.7
1945	53	53.7
1946	53	53.7
1947	57	53.7
1948	54	53.7
1949	62	53.7
1950	37	56.2
1951	38	56.2
1952	65	56.2
1953	63	56.2
1954	54	56.2
1955	65	56.2
1956	65	56.2
1957	53	56.2
1958	52	56.2
1959	70	56.2
1960	65	57.1
1961	76	57.1
1962	43	57.1
1963	60	57.1
1964	56	57.1
1965	38	57.1
1966	69	57.1
1967	63	57.1
1968	45	57.1
1969	56	57.1
1970	69	52.4
1971	58	52.4
1972	41	52.4
1973	47	52.4
1974	50	52.4
1975	44	52.4
1976	67	52.4
1977	48	52.4
1978	47	52.4
1979	53	52.4
1980	57	58
1981	55	58
1982	46	58
1983	65	58
1984	68	58
1985	49	58
1986	51	58
1987	52	58
1988	81	58
1989	56	58
1990	62	55.6
1991	50	55.6
1992	49	55.6
1993	20	55.6
1994	59	55.6
1995	62	55.6
1996	56	55.6
1997	72	55.6
1998	75	55.6
1999	51	55.6
2000	69	59
2001	60	59
2002	59	59
2003	71	59
2004	41	59
2005	52	59
2006	64	59
2007	67	59
2008	57	59
2009	50	59
2010	42	57.1
2011	63	57.1
2012	80	57.1
2013	60	57.1
2014	47	57.1
2015	65	57.1
2016	56	57.1
2017	73	57.1
2018	45	57.1
2019	40	57.1
2020	62	65.6
2021	82	65.6
2022	65	65.6
2023	55	65.6
2024	65	65.6
2025	64	65.6
2026	66	65.6

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

First to last qualifying date each year at Miles City AP
Year	First date	Last date
1937	1937-05-27	1937-09-22
1938	1938-04-30	1938-10-03
1939	1939-04-29	1939-09-21
1940	1940-05-11	1940-09-17
1941	1941-05-12	1941-09-18
1942	1942-07-02	1942-10-10
1943	1943-04-23	1943-10-04
1944	1944-05-13	1944-09-13
1945	1945-06-21	1945-09-08
1946	1946-04-26	1946-10-01
1947	1947-05-02	1947-10-19
1948	1948-05-17	1948-10-03
1949	1949-04-28	1949-09-29
1950	1950-05-22	1950-09-06
1951	1951-05-23	1951-08-23
1952	1952-04-26	1952-09-26
1953	1953-05-07	1953-10-10
1954	1954-05-19	1954-09-26
1955	1955-05-01	1955-10-10
1956	1956-05-17	1956-09-26
1957	1957-05-02	1957-10-03
1958	1958-05-10	1958-09-19
1959	1959-04-30	1959-09-14
1960	1960-05-11	1960-10-06
1961	1961-05-10	1961-09-16
1962	1962-04-19	1962-09-27
1963	1963-05-31	1963-10-04
1964	1964-05-13	1964-09-17
1965	1965-06-12	1965-09-01
1966	1966-05-04	1966-09-23
1967	1967-05-17	1967-09-29
1968	1968-04-30	1968-09-13
1969	1969-05-13	1969-09-20
1970	1970-05-17	1970-10-05
1971	1971-05-13	1971-09-11
1972	1972-05-16	1972-09-09
1973	1973-05-31	1973-09-06
1974	1974-04-25	1974-09-25
1975	1975-05-15	1975-10-06
1976	1976-05-28	1976-10-02
1977	1977-04-26	1977-09-07
1978	1978-05-15	1978-09-10
1979	1979-05-16	1979-09-28
1980	1980-04-20	1980-10-08
1981	1981-05-01	1981-09-19
1982	1982-06-22	1982-09-09
1983	1983-05-25	1983-09-26
1984	1984-05-15	1984-09-18
1985	1985-05-02	1985-09-14
1986	1986-05-03	1986-08-29
1987	1987-04-28	1987-10-03
1988	1988-05-12	1988-09-06
1989	1989-05-23	1989-09-30
1990	1990-05-06	1990-09-25
1991	1991-06-10	1991-10-16
1992	1992-05-06	1992-10-03
1993	1993-05-13	1993-10-05
1994	1994-04-17	1994-09-24
1995	1995-05-31	1995-10-11
1996	1996-06-08	1996-09-13
1997	1997-05-15	1997-10-02
1998	1998-05-03	1998-09-18
1999	1999-05-28	1999-09-22
2000	2000-05-02	2000-09-28
2001	2001-05-12	2001-09-28
2002	2002-05-21	2002-09-16
2003	2003-05-25	2003-10-07
2004	2004-05-08	2004-10-09
2005	2005-06-17	2005-10-01
2006	2006-05-18	2006-09-13
2007	2007-05-02	2007-09-28
2008	2008-05-18	2008-10-04
2009	2009-05-19	2009-09-26
2010	2010-06-24	2010-09-28
2011	2011-06-28	2011-10-04
2012	2012-04-23	2012-09-18
2013	2013-05-12	2013-09-17
2014	2014-05-23	2014-09-26
2015	2015-06-01	2015-10-10
2016	2016-05-04	2016-09-02
2017	2017-05-06	2017-09-13
2018	2018-05-26	2018-09-10
2019	2019-06-03	2019-09-16
2020	2020-06-06	2020-09-24
2021	2021-04-30	2021-10-05
2022	2022-06-17	2022-09-29
2023	2023-04-11	2023-09-18
2024	2024-06-11	2024-09-29
2025	2025-05-10	2025-09-30
2026	2026-05-13	2026-10-09

Every Fixed Threshold

Fixed thresholds at Miles City AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	90	82	2021	66
35 C (95 F): Days	90	42	1988	27
40 C (104 F): Days	51	9	2003	5
45 C (113 F): Days	1	0	n/a	1
90 F (32.2 C): Days	90	62	2021	50
100 F (37.8 C): Days	84	21	1988	10
110 F (43.3 C): Days	6	2	2007	1
0 C (32 F): Ice days (max	90	102	1978	18
0 C (32 F): Frost days (min	90	196	2002	106
-10 C (14 F): Days with min	90	100	1978	19
-20 C (-4 F): Days with min	90	52	1949	5
-30 C (-22 F): Days with min	70	13	1985	4
20 C (68 F): Tropical nights (min	86	27	1988	15
25 C (77 F): Days with min	11	2	1988	1
10 mm (0.39 in): Days with 10 mm or more rain	90	15	2011	6
25 mm (0.98 in): Days with 25 mm or more rain	69	5	1973	2
50 mm (1.97 in): Days with 50 mm or more rain	16	1	1941	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	5	1967	3
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1949	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1937.

Download the Data

Data for Miles City AP 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).

Miles City AP Threshold Days by Year (USW00024037)

Key Facts for Miles City AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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