Mellette 4 W Threshold Days by Year (USC00395456)

22 fixed thresholds counted per year at Mellette 4 W (USC00395456): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mellette 4 W Thresholds

Mellette 4 W: days with 10 mm (0.39 in) or more of precipitation in 112 years, most in 1977 with 28.
Mellette 4 W: days with 25 mm (0.98 in) or more of precipitation in 111 years, most in 1953 with 10.
Mellette 4 W: days with a maximum temperature at or above 30 C (86 F) in 109 years, most in 1936 with 84.
Mellette 4 W: days with a maximum temperature at or below 0 C (32 F) in 109 years, most in 1996 with 109.
22 fixed thresholds have at least one qualifying day at Mellette 4 W.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at Mellette 4 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 1936.

Days at or above 30 C (86 F) per year at Mellette 4 W
Year	Days	Decade average
1897	66	66
1900	58	38.5
1902	25	38.5
1903	25	38.5
1904	29	38.5
1906	42	38.5
1907	34	38.5
1908	52	38.5
1909	43	38.5
1910	64	42.8
1911	52	42.8
1912	38	42.8
1913	54	42.8
1914	41	42.8
1915	10	42.8
1916	42	42.8
1917	42	42.8
1918	38	42.8
1919	47	42.8
1920	34	41.2
1921	66	41.2
1923	44	41.2
1924	18	41.2
1925	49	41.2
1926	51	41.2
1927	28	41.2
1928	28	41.2
1929	53	41.2
1930	54	68.8
1931	75	68.8
1932	52	68.8
1933	77	68.8
1934	78	68.8
1935	57	68.8
1936	84	68.8
1937	67	68.8
1938	67	68.8
1939	77	68.8
1940	68	51.7
1941	62	51.7
1942	28	51.7
1943	53	51.7
1944	44	51.7
1945	43	51.7
1946	37	51.7
1947	58	51.7
1948	56	51.7
1949	68	51.7
1950	34	52.3
1951	20	52.3
1952	75	52.3
1953	52	52.3
1954	50	52.3
1955	70	52.3
1956	48	52.3
1957	41	52.3
1958	53	52.3
1959	80	52.3
1960	48	45.8
1961	65	45.8
1962	27	45.8
1963	47	45.8
1964	60	45.8
1965	37	45.8
1966	49	45.8
1967	42	45.8
1968	37	45.8
1970	62	54.7
1971	48	54.7
1975	51	54.7
1976	78	54.7
1977	44	54.7
1978	45	54.7
1981	44	48.4
1982	24	48.4
1983	60	48.4
1984	45	48.4
1985	36	48.4
1986	35	48.4
1987	63	48.4
1988	75	48.4
1989	54	48.4
1990	44	32.5
1991	41	32.5
1992	22	32.5
1993	13	32.5
1994	28	32.5
1995	38	32.5
1996	37	32.5
1997	30	32.5
1998	38	32.5
1999	34	32.5
2000	46	39.3
2001	53	39.3
2002	56	39.3
2003	44	39.3
2004	20	39.3
2005	45	39.3
2006	53	39.3
2007	38	39.3
2008	21	39.3
2009	17	39.3
2010	33	35
2011	30	35
2012	58	35
2013	30	35
2014	15	35
2015	41	35
2016	38	35

For each year, a bar from the first to the last day at Mellette 4 W meeting 30 C (86 F).

First to last qualifying date each year at Mellette 4 W
Year	First date	Last date
1897	1897-04-27	1897-10-02
1900	1900-05-10	1900-09-09
1902	1902-04-20	1902-09-08
1903	1903-06-07	1903-10-24
1904	1904-06-17	1904-09-26
1906	1906-05-10	1906-09-10
1907	1907-06-15	1907-08-31
1908	1908-04-13	1908-10-14
1909	1909-05-04	1909-10-06
1910	1910-03-21	1910-10-17
1911	1911-04-26	1911-09-22
1912	1912-06-24	1912-10-05
1913	1913-04-15	1913-09-13
1914	1914-06-03	1914-09-27
1915	1915-05-10	1915-09-05
1916	1916-05-05	1916-09-09
1917	1917-05-16	1917-09-23
1918	1918-05-03	1918-09-12
1919	1919-05-29	1919-09-18
1920	1920-06-08	1920-10-07
1921	1921-05-21	1921-09-03
1923	1923-04-19	1923-09-05
1924	1924-04-23	1924-09-03
1925	1925-05-19	1925-09-16
1926	1926-04-15	1926-09-16
1927	1927-06-19	1927-10-21
1928	1928-05-07	1928-10-10
1929	1929-05-22	1929-09-22
1930	1930-05-21	1930-09-23
1931	1931-04-12	1931-10-02
1932	1932-05-13	1932-09-14
1933	1933-05-17	1933-09-29
1934	1934-04-28	1934-10-13
1935	1935-06-13	1935-09-24
1936	1936-04-13	1936-10-08
1937	1937-05-28	1937-10-03
1938	1938-06-05	1938-10-09
1939	1939-05-01	1939-09-24
1940	1940-05-11	1940-09-27
1941	1941-05-13	1941-09-21
1942	1942-04-14	1942-10-07
1943	1943-05-28	1943-10-11
1944	1944-05-15	1944-09-17
1945	1945-04-08	1945-10-17
1946	1946-03-31	1946-09-05
1947	1947-07-03	1947-10-21
1948	1948-05-18	1948-09-18
1949	1949-05-03	1949-09-25
1950	1950-05-22	1950-10-30
1951	1951-07-14	1951-10-01
1952	1952-04-26	1952-09-29
1953	1953-05-29	1953-10-02
1954	1954-04-14	1954-09-26
1955	1955-04-30	1955-10-10
1956	1956-05-24	1956-10-12
1957	1957-06-19	1957-08-31
1958	1958-04-16	1958-10-15
1959	1959-04-30	1959-09-14
1960	1960-06-26	1960-09-20
1961	1961-05-10	1961-10-16
1962	1962-04-24	1962-09-11
1963	1963-05-07	1963-10-05
1964	1964-04-16	1964-09-13
1965	1965-04-29	1965-09-02
1966	1966-05-21	1966-09-11
1967	1967-05-22	1967-09-25
1968	1968-04-30	1968-09-14
1970	1970-05-07	1970-10-05
1971	1971-04-20	1971-09-13
1975	1975-05-17	1975-10-08
1976	1976-06-01	1976-10-02
1977	1977-04-10	1977-09-09
1978	1978-06-16	1978-09-26
1981	1981-05-03	1981-09-13
1982	1982-05-03	1982-09-10
1983	1983-06-10	1983-09-27
1984	1984-05-16	1984-09-21
1985	1985-04-18	1985-08-08
1986	1986-05-31	1986-09-01
1987	1987-04-19	1987-09-27
1988	1988-05-13	1988-09-19
1989	1989-05-24	1989-10-01
1990	1990-04-23	1990-10-06
1991	1991-05-15	1991-10-17
1992	1992-05-01	1992-10-03
1993	1993-06-12	1993-10-07
1994	1994-05-18	1994-09-13
1995	1995-06-15	1995-09-29
1996	1996-06-11	1996-09-10
1997	1997-05-18	1997-10-03
1998	1998-05-31	1998-09-19
1999	1999-05-30	1999-09-01
2000	2000-05-05	2000-09-30
2001	2001-04-29	2001-09-07
2002	2002-05-29	2002-09-18
2003	2003-04-14	2003-10-11
2004	2004-04-29	2004-09-20
2005	2005-05-21	2005-10-01
2006	2006-05-24	2006-10-08
2007	2007-05-14	2007-10-07
2008	2008-06-24	2008-09-17
2009	2009-04-24	2009-08-14
2010	2010-05-25	2010-08-31
2011	2011-06-07	2011-10-04
2012	2012-04-02	2012-09-16
2013	2013-05-14	2013-09-23
2014	2014-05-29	2014-09-27
2015	2015-05-03	2015-10-12
2016	2016-05-06	2016-08-29

Every Fixed Threshold

Fixed thresholds at Mellette 4 W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	84	1936	38
35 C (95 F): Days	101	45	1936	2
40 C (104 F): Days	41	13	1931	1
45 C (113 F): Days	2	1	1965	1
90 F (32.2 C): Days	108	64	1959	18
100 F (37.8 C): Days	75	33	1936	1
110 F (43.3 C): Days	10	3	1931	1
0 C (32 F): Ice days (max	109	109	1996	59
0 C (32 F): Frost days (min	109	213	1907	180
-10 C (14 F): Days with min	109	125	1978	63
-20 C (-4 F): Days with min	109	66	1978	18
-30 C (-22 F): Days with min	98	25	1936	3
-40 C (-40 F): Days with min	7	2	1994	1
20 C (68 F): Tropical nights (min	105	21	1936	7
25 C (77 F): Days with min	15	7	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	112	28	1977	16
25 mm (0.98 in): Days with 25 mm or more rain	111	10	1953	2
50 mm (1.97 in): Days with 50 mm or more rain	54	4	1953	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1926	1
10 cm (3.9 in): Days with 10 cm or more snowfall	88	8	1929	3
25 cm (9.8 in): Days with 25 cm or more snowfall	17	2	2001	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1900	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

Data for Mellette 4 W 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Mellette 4 W Threshold Days by Year (USC00395456)

Key Facts for Mellette 4 W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related