Mandan Exp STN Threshold Days by Year (USC00325479)

21 fixed thresholds counted per year at Mandan Exp STN (USC00325479): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mandan Exp STN Thresholds

Mandan Exp STN: nights with a minimum temperature at or below 0 C (32 F) in 108 years, most in 2002 with 210.
Mandan Exp STN: nights with a minimum temperature at or below -10 C (14 F) in 108 years, most in 1955 with 124.
Mandan Exp STN: nights with a minimum temperature at or below -20 C (-4 F) in 108 years, most in 1916 with 69.
Mandan Exp STN: days with a maximum temperature at or above 30 C (86 F) in 100 years, most in 1936 with 80.
21 fixed thresholds have at least one qualifying day at Mandan Exp STN.

Days at or above 30 C (86 F)

100 years with a qualifying day

Days per year at Mandan Exp STN with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1936.

Days at or above 30 C (86 F) per year at Mandan Exp STN
Year	Days	Decade average
1916	31	39.5
1917	37	39.5
1918	29	39.5
1919	61	39.5
1920	52	29.8
1924	13	29.8
1928	15	29.8
1929	39	29.8
1930	42	49
1931	46	49
1932	34	49
1934	57	49
1935	38	49
1936	80	49
1937	47	49
1938	43	49
1939	54	49
1940	50	37.1
1941	48	37.1
1942	20	37.1
1943	37	37.1
1944	27	37.1
1945	29	37.1
1946	36	37.1
1948	45	37.1
1949	42	37.1
1950	25	33.2
1951	15	33.2
1952	44	33.2
1953	27	33.2
1954	25	33.2
1955	40	33.2
1956	22	33.2
1957	31	33.2
1958	45	33.2
1959	58	33.2
1960	44	33.3
1961	57	33.3
1962	21	33.3
1963	36	33.3
1964	32	33.3
1965	11	33.3
1966	44	33.3
1967	34	33.3
1968	20	33.3
1969	34	33.3
1970	52	34.6
1971	28	34.6
1972	29	34.6
1973	33	34.6
1974	33	34.6
1975	28	34.6
1976	50	34.6
1977	34	34.6
1978	33	34.6
1979	26	34.6
1980	39	36.4
1981	24	36.4
1982	30	36.4
1983	42	36.4
1984	42	36.4
1985	25	36.4
1986	19	36.4
1987	31	36.4
1988	61	36.4
1989	51	36.4
1990	41	28.8
1991	37	28.8
1992	19	28.8
1993	12	28.8
1994	28	28.8
1995	28	28.8
1996	28	28.8
1997	44	28.8
1998	35	28.8
1999	16	28.8
2000	29	35.6
2001	37	35.6
2002	46	35.6
2003	47	35.6
2004	23	35.6
2005	34	35.6
2006	54	35.6
2007	38	35.6
2008	33	35.6
2009	15	35.6
2011	27	28.1
2012	42	28.1
2013	23	28.1
2014	18	28.1
2015	37	28.1
2016	30	28.1
2017	37	28.1
2018	26	28.1
2019	13	28.1
2021	38	33.2
2023	34	33.2
2024	33	33.2
2025	23	33.2
2026	38	33.2

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

First to last qualifying date each year at Mandan Exp STN
Year	First date	Last date
1916	1916-05-06	1916-09-03
1917	1917-05-15	1917-09-23
1918	1918-05-04	1918-09-22
1919	1919-05-26	1919-09-16
1920	1920-05-21	1920-10-07
1924	1924-07-05	1924-09-23
1928	1928-05-07	1928-09-06
1929	1929-06-14	1929-09-14
1930	1930-05-03	1930-09-22
1931	1931-05-14	1931-09-29
1932	1932-05-13	1932-09-08
1934	1934-04-28	1934-10-10
1935	1935-06-29	1935-09-23
1936	1936-05-11	1936-10-08
1937	1937-05-28	1937-10-03
1938	1938-06-05	1938-10-03
1939	1939-04-30	1939-09-18
1940	1940-05-11	1940-09-18
1941	1941-05-13	1941-09-19
1942	1942-04-14	1942-09-10
1943	1943-05-22	1943-10-10
1944	1944-05-13	1944-08-18
1945	1945-06-21	1945-10-16
1946	1946-04-30	1946-09-16
1948	1948-05-18	1948-09-19
1949	1949-04-30	1949-10-06
1950	1950-05-23	1950-09-07
1951	1951-05-24	1951-08-24
1952	1952-04-27	1952-09-28
1953	1953-06-12	1953-10-02
1954	1954-05-21	1954-09-01
1955	1955-05-03	1955-10-10
1956	1956-05-22	1956-10-13
1957	1957-06-10	1957-10-03
1958	1958-05-12	1958-10-14
1959	1959-05-03	1959-09-14
1960	1960-05-14	1960-10-05
1961	1961-05-31	1961-09-19
1962	1962-04-25	1962-09-08
1963	1963-05-31	1963-10-05
1964	1964-05-21	1964-09-18
1965	1965-07-16	1965-08-14
1966	1966-05-05	1966-09-13
1967	1967-05-23	1967-09-23
1968	1968-05-01	1968-09-15
1969	1969-05-15	1969-09-14
1970	1970-05-18	1970-10-06
1971	1971-07-03	1971-09-07
1972	1972-05-16	1972-09-20
1973	1973-06-02	1973-09-01
1974	1974-06-04	1974-08-26
1975	1975-05-17	1975-09-17
1976	1976-06-03	1976-10-01
1977	1977-04-10	1977-08-10
1978	1978-07-03	1978-09-11
1979	1979-05-17	1979-09-27
1980	1980-04-21	1980-09-08
1981	1981-06-27	1981-09-13
1982	1982-05-04	1982-09-11
1983	1983-05-27	1983-09-28
1984	1984-05-17	1984-09-22
1985	1985-05-04	1985-08-09
1986	1986-05-05	1986-08-20
1987	1987-04-19	1987-09-15
1988	1988-05-26	1988-08-31
1989	1989-04-23	1989-10-01
1990	1990-04-22	1990-09-26
1991	1991-06-12	1991-09-08
1992	1992-05-01	1992-10-02
1993	1993-05-14	1993-09-12
1994	1994-05-18	1994-09-20
1995	1995-06-15	1995-09-05
1996	1996-06-10	1996-09-10
1997	1997-05-18	1997-10-03
1998	1998-05-18	1998-09-18
1999	1999-06-26	1999-09-01
2000	2000-05-06	2000-09-18
2001	2001-04-29	2001-09-06
2002	2002-05-29	2002-09-18
2003	2003-04-14	2003-10-20
2004	2004-06-07	2004-09-20
2005	2005-06-19	2005-10-02
2006	2006-05-19	2006-09-15
2007	2007-05-19	2007-09-30
2008	2008-07-02	2008-09-20
2009	2009-06-26	2009-09-19
2011	2011-06-02	2011-10-06
2012	2012-04-25	2012-09-16
2013	2013-05-14	2013-09-07
2014	2014-05-24	2014-09-27
2015	2015-06-09	2015-10-11
2016	2016-05-06	2016-09-12
2017	2017-05-08	2017-09-12
2018	2018-05-16	2018-08-18
2019	2019-06-03	2019-09-16
2021	2021-07-01	2021-10-05
2023	2023-05-23	2023-09-19
2024	2024-06-15	2024-10-09
2025	2025-05-10	2025-10-03
2026	2026-04-22	2026-08-29

Every Fixed Threshold

Fixed thresholds at Mandan Exp STN
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	100	80	1936	38
35 C (95 F): Days	96	32	1936	12
40 C (104 F): Days	24	10	1936	2
45 C (113 F): Days	1	1	1936	1
90 F (32.2 C): Days	100	55	1936	26
100 F (37.8 C): Days	60	19	1936	10
110 F (43.3 C): Days	3	3	1936	1
0 C (32 F): Ice days (max	100	123	1950	25
0 C (32 F): Frost days (min	108	210	2002	67
-10 C (14 F): Days with min	108	124	1955	19
-20 C (-4 F): Days with min	108	69	1916	10
-30 C (-22 F): Days with min	95	27	1936	2
-40 C (-40 F): Days with min	4	5	1916	3
20 C (68 F): Tropical nights (min	91	21	1936	5
25 C (77 F): Days with min	1	4	1936	4
10 mm (0.39 in): Days with 10 mm or more rain	100	20	1995	11
25 mm (0.98 in): Days with 25 mm or more rain	91	8	2013	2
50 mm (1.97 in): Days with 50 mm or more rain	29	1	1924	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1960	1
10 cm (3.9 in): Days with 10 cm or more snowfall	71	7	1996	1
25 cm (9.8 in): Days with 25 cm or more snowfall	6	1	1930	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

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Data for Mandan Exp STN 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Mandan Exp STN Threshold Days by Year (USC00325479)

Key Facts for Mandan Exp STN Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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