Winona Threshold Days by Year (USC00219067)

18 fixed thresholds counted per year at Winona (USC00219067): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Winona Thresholds

Winona: nights with a minimum temperature at or below 0 C (32 F) in 102 years, most in 1975 with 184.
Winona: nights with a minimum temperature at or below -10 C (14 F) in 102 years, most in 1978 with 105.
Winona: nights with a minimum temperature at or below -20 C (-4 F) in 102 years, most in 1978 with 53.
Winona: nights with a minimum temperature at or above 20 C (68 F) in 102 years, most in 1933 with 59.
18 fixed thresholds have at least one qualifying day at Winona.

Days at or above 30 C (86 F)

97 years with a qualifying day

Days per year at Winona with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 1939.

Days at or above 30 C (86 F) per year at Winona
Year	Days	Decade average
1893	41	38.3
1894	65	38.3
1895	26	38.3
1896	21	38.3
1902	11	18.5
1903	5	18.5
1904	9	18.5
1905	12	18.5
1906	19	18.5
1907	10	18.5
1908	32	18.5
1909	50	18.5
1910	58	41.7
1911	53	41.7
1912	33	41.7
1913	55	41.7
1914	42	41.7
1915	17	41.7
1916	47	41.7
1917	22	41.7
1918	34	41.7
1919	56	41.7
1920	35	40.3
1921	67	40.3
1922	42	40.3
1923	63	40.3
1924	14	40.3
1925	45	40.3
1926	38	40.3
1928	34	40.3
1929	25	40.3
1931	62	54.2
1932	48	54.2
1933	68	54.2
1934	46	54.2
1935	49	54.2
1936	63	54.2
1937	52	54.2
1938	29	54.2
1939	71	54.2
1940	48	43
1941	43	43
1942	21	43
1943	51	43
1945	25	43
1946	25	43
1947	51	43
1948	52	43
1949	71	43
1950	37	39.2
1951	30	39.2
1952	53	39.2
1953	62	39.2
1954	47	39.2
1955	52	39.2
1956	32	39.2
1957	23	39.2
1958	17	39.2
1959	39	39.2
1960	30	32.4
1961	36	32.4
1962	22	32.4
1963	41	32.4
1964	48	32.4
1965	17	32.4
1966	40	32.4
1967	33	32.4
1968	31	32.4
1969	26	32.4
1970	51	39.3
1971	34	39.3
1972	37	39.3
1973	40	39.3
1974	28	39.3
1975	50	39.3
1977	46	39.3
1978	37	39.3
1979	31	39.3
1980	48	31
1981	9	31
1982	27	31
1989	40	31
1990	26	28.8
1991	28	28.8
1992	9	28.8
1997	25	28.8
1998	38	28.8
1999	47	28.8
2000	35	38.7
2001	49	38.7
2002	49	38.7
2003	48	38.7
2004	17	38.7
2005	43	38.7
2006	33	38.7
2007	48	38.7
2008	26	38.7

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

First to last qualifying date each year at Winona
Year	First date	Last date
1893	1893-06-12	1893-10-10
1894	1894-05-14	1894-09-28
1895	1895-05-08	1895-09-20
1896	1896-05-06	1896-08-29
1902	1902-04-21	1902-08-02
1903	1903-07-02	1903-07-28
1904	1904-07-16	1904-09-28
1905	1905-06-06	1905-08-30
1906	1906-06-29	1906-09-12
1907	1907-06-17	1907-09-01
1908	1908-05-17	1908-09-25
1909	1909-05-05	1909-09-10
1910	1910-04-28	1910-09-17
1911	1911-05-10	1911-09-16
1912	1912-06-23	1912-10-05
1913	1913-04-30	1913-09-07
1914	1914-05-26	1914-09-21
1915	1915-06-05	1915-09-05
1916	1916-07-01	1916-10-07
1917	1917-05-17	1917-08-26
1918	1918-05-03	1918-10-12
1919	1919-05-26	1919-10-02
1920	1920-05-31	1920-09-25
1921	1921-05-20	1921-09-20
1922	1922-05-10	1922-10-05
1923	1923-05-01	1923-09-26
1924	1924-06-19	1924-08-30
1925	1925-04-22	1925-09-20
1926	1926-05-01	1926-09-17
1928	1928-05-08	1928-08-27
1929	1929-05-28	1929-09-04
1931	1931-05-27	1931-09-21
1932	1932-05-13	1932-08-31
1933	1933-05-17	1933-09-25
1934	1934-05-01	1934-08-19
1935	1935-06-12	1935-09-24
1936	1936-05-06	1936-09-23
1937	1937-05-29	1937-09-24
1938	1938-06-20	1938-09-04
1939	1939-05-05	1939-09-23
1940	1940-05-12	1940-09-21
1941	1941-05-26	1941-09-21
1942	1942-04-24	1942-08-31
1943	1943-05-05	1943-09-27
1945	1945-06-14	1945-09-10
1946	1946-04-22	1946-08-18
1947	1947-06-09	1947-10-21
1948	1948-05-20	1948-09-19
1949	1949-05-01	1949-09-03
1950	1950-05-24	1950-10-19
1951	1951-05-02	1951-09-12
1952	1952-04-29	1952-09-14
1953	1953-05-09	1953-10-21
1954	1954-04-15	1954-09-07
1955	1955-05-03	1955-09-19
1956	1956-05-13	1956-08-29
1957	1957-06-17	1957-09-02
1958	1958-06-29	1958-09-04
1959	1959-05-03	1959-09-09
1960	1960-04-23	1960-09-08
1961	1961-05-13	1961-09-11
1962	1962-04-27	1962-08-30
1963	1963-06-05	1963-10-07
1964	1964-04-17	1964-09-10
1965	1965-05-03	1965-08-18
1966	1966-05-27	1966-09-11
1967	1967-05-19	1967-10-03
1968	1968-05-01	1968-09-04
1969	1969-05-28	1969-08-30
1970	1970-04-28	1970-09-08
1971	1971-06-05	1971-10-01
1972	1972-05-18	1972-09-18
1973	1973-06-09	1973-09-02
1974	1974-05-22	1974-08-27
1975	1975-05-20	1975-10-14
1977	1977-04-11	1977-09-01
1978	1978-05-26	1978-09-12
1979	1979-05-10	1979-09-06
1980	1980-04-22	1980-09-09
1981	1981-06-06	1981-09-11
1982	1982-06-08	1982-09-11
1989	1989-05-21	1989-08-27
1990	1990-04-25	1990-09-12
1991	1991-04-06	1991-09-06
1992	1992-05-01	1992-08-24
1997	1997-06-13	1997-10-06
1998	1998-05-14	1998-09-26
1999	1999-05-28	1999-09-07
2000	2000-05-04	2000-09-18
2001	2001-05-14	2001-08-23
2002	2002-04-15	2002-09-30
2003	2003-04-14	2003-09-11
2004	2004-04-28	2004-09-02
2005	2005-06-06	2005-10-04
2006	2006-05-28	2006-08-04
2007	2007-04-29	2007-10-06
2008	2008-06-25	2008-09-02

Every Fixed Threshold

Fixed thresholds at Winona
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	97	71	1939	26
35 C (95 F): Days	76	26	1931	1
40 C (104 F): Days	5	7	1936	7
90 F (32.2 C): Days	96	47	1933	6
100 F (37.8 C): Days	26	12	1936	1
0 C (32 F): Ice days (max	97	88	1955	77
0 C (32 F): Frost days (min	102	184	1975	148
-10 C (14 F): Days with min	102	105	1978	64
-20 C (-4 F): Days with min	102	53	1978	22
-30 C (-22 F): Days with min	48	10	1979	1
20 C (68 F): Tropical nights (min	102	59	1933	16
25 C (77 F): Days with min	41	8	1931	4
10 mm (0.39 in): Days with 10 mm or more rain	93	40	1938	25
25 mm (0.98 in): Days with 25 mm or more rain	93	18	2004	8
50 mm (1.97 in): Days with 50 mm or more rain	64	4	1925	1
100 mm (3.94 in): Days with 100 mm or more rain	4	2	2007	2
10 cm (3.9 in): Days with 10 cm or more snowfall	61	9	1961	2
25 cm (9.8 in): Days with 25 cm or more snowfall	19	2	1936	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Winona 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).

Winona Threshold Days by Year (USC00219067)

Key Facts for Winona Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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