Superior Threshold Days by Year (USC00478349)

18 fixed thresholds counted per year at Superior (USC00478349): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Superior Thresholds

Superior: days with 10 mm (0.39 in) or more of precipitation in 113 years, most in 1977 with 36.
Superior: days with 25 mm (0.98 in) or more of precipitation in 112 years, most in 1991 with 15.
Superior: nights with a minimum temperature at or below 0 C (32 F) in 109 years, most in 1961 with 210.
Superior: nights with a minimum temperature at or below -10 C (14 F) in 109 years, most in 1950 with 111.
18 fixed thresholds have at least one qualifying day at Superior.

Days at or above 30 C (86 F)

101 years with a qualifying day

Days per year at Superior with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 29 in 1961.

Days at or above 30 C (86 F) per year at Superior
Year	Days	Decade average
1910	18	9.8
1911	6	9.8
1918	6	9.8
1919	9	9.8
1920	7	9.2
1921	18	9.2
1922	9	9.2
1923	8	9.2
1924	7	9.2
1925	16	9.2
1926	5	9.2
1927	1	9.2
1928	7	9.2
1929	14	9.2
1930	16	13.1
1932	14	13.1
1933	7	13.1
1934	10	13.1
1935	8	13.1
1936	22	13.1
1937	17	13.1
1938	12	13.1
1939	12	13.1
1940	9	14.7
1941	21	14.7
1942	6	14.7
1943	11	14.7
1944	12	14.7
1948	26	14.7
1949	18	14.7
1950	12	16.2
1951	9	16.2
1952	20	16.2
1953	21	16.2
1954	11	16.2
1955	25	16.2
1956	11	16.2
1957	15	16.2
1958	14	16.2
1959	24	16.2
1960	21	18
1961	29	18
1962	7	18
1963	23	18
1964	24	18
1965	10	18
1966	28	18
1968	3	18
1969	17	18
1970	23	11.8
1971	7	11.8
1972	5	11.8
1973	8	11.8
1974	10	11.8
1975	19	11.8
1976	21	11.8
1977	7	11.8
1978	13	11.8
1979	5	11.8
1980	15	13.7
1982	4	13.7
1983	26	13.7
1984	14	13.7
1985	5	13.7
1986	12	13.7
1987	13	13.7
1988	23	13.7
1989	11	13.7
1990	6	8
1991	14	8
1992	5	8
1993	4	8
1994	3	8
1995	12	8
1996	4	8
1997	8	8
1998	13	8
1999	11	8
2000	6	10.9
2001	12	10.9
2002	20	10.9
2003	15	10.9
2004	4	10.9
2005	10	10.9
2006	15	10.9
2009	5	10.9
2011	21	15
2012	20	15
2013	12	15
2015	12	15
2016	14	15
2017	10	15
2018	19	15
2019	12	15
2020	9	14.1
2021	25	14.1
2022	15	14.1
2023	13	14.1
2024	13	14.1
2025	12	14.1
2026	12	14.1

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

First to last qualifying date each year at Superior
Year	First date	Last date
1910	1910-06-14	1910-08-21
1911	1911-06-19	1911-08-15
1918	1918-05-06	1918-08-26
1919	1919-05-29	1919-08-10
1920	1920-06-10	1920-09-26
1921	1921-05-22	1921-09-02
1922	1922-06-05	1922-08-18
1923	1923-06-19	1923-07-22
1924	1924-06-28	1924-08-30
1925	1925-05-21	1925-09-18
1926	1926-06-29	1926-08-28
1927	1927-06-29	1927-06-29
1928	1928-06-30	1928-08-15
1929	1929-06-11	1929-09-03
1930	1930-06-03	1930-08-27
1932	1932-05-15	1932-08-31
1933	1933-06-20	1933-08-07
1934	1934-05-28	1934-08-19
1935	1935-07-17	1935-08-01
1936	1936-06-20	1936-08-24
1937	1937-07-03	1937-08-29
1938	1938-06-21	1938-08-23
1939	1939-05-31	1939-09-16
1940	1940-05-13	1940-08-09
1941	1941-05-20	1941-09-21
1942	1942-07-12	1942-08-22
1943	1943-06-22	1943-08-01
1944	1944-05-30	1944-08-13
1948	1948-05-26	1948-09-17
1949	1949-06-10	1949-08-26
1950	1950-06-05	1950-09-08
1951	1951-06-15	1951-08-02
1952	1952-04-27	1952-09-11
1953	1953-05-07	1953-10-02
1954	1954-06-09	1954-08-25
1955	1955-05-18	1955-08-20
1956	1956-06-08	1956-08-14
1957	1957-04-30	1957-08-14
1958	1958-05-29	1958-08-11
1959	1959-05-01	1959-09-07
1960	1960-06-27	1960-09-06
1961	1961-05-31	1961-10-06
1962	1962-05-17	1962-08-27
1963	1963-06-25	1963-08-09
1964	1964-05-21	1964-08-05
1965	1965-04-29	1965-08-14
1966	1966-05-26	1966-08-26
1968	1968-07-06	1968-07-08
1969	1969-05-28	1969-09-13
1970	1970-05-19	1970-09-08
1971	1971-06-07	1971-09-03
1972	1972-06-08	1972-08-18
1973	1973-07-04	1973-08-30
1974	1974-06-28	1974-08-21
1975	1975-07-02	1975-08-10
1976	1976-06-08	1976-09-12
1977	1977-05-13	1977-07-23
1978	1978-06-10	1978-09-06
1979	1979-07-10	1979-08-07
1980	1980-05-04	1980-08-01
1982	1982-06-27	1982-08-19
1983	1983-06-22	1983-09-02
1984	1984-05-18	1984-09-19
1985	1985-07-08	1985-09-19
1986	1986-05-04	1986-08-16
1987	1987-06-11	1987-08-11
1988	1988-05-26	1988-08-11
1989	1989-07-03	1989-08-10
1990	1990-06-13	1990-09-13
1991	1991-05-11	1991-08-30
1992	1992-05-01	1992-10-02
1993	1993-06-21	1993-08-25
1994	1994-05-20	1994-08-24
1995	1995-05-31	1995-09-04
1996	1996-07-04	1996-07-23
1997	1997-06-12	1997-08-26
1998	1998-07-02	1998-09-18
1999	1999-05-29	1999-08-27
2000	2000-07-01	2000-09-18
2001	2001-06-25	2001-08-07
2002	2002-05-30	2002-09-09
2003	2003-07-01	2003-08-26
2004	2004-07-12	2004-08-01
2005	2005-06-23	2005-09-11
2006	2006-07-01	2006-08-03
2009	2009-05-20	2009-08-12
2011	2011-07-03	2011-09-11
2012	2012-06-10	2012-08-22
2013	2013-06-27	2013-09-06
2015	2015-07-05	2015-10-11
2016	2016-05-06	2016-08-23
2017	2017-06-10	2017-09-23
2018	2018-05-16	2018-08-13
2019	2019-06-26	2019-08-04
2020	2020-06-02	2020-08-26
2021	2021-05-01	2021-09-19
2022	2022-06-20	2022-09-08
2023	2023-05-23	2023-09-03
2024	2024-06-25	2024-09-27
2025	2025-05-06	2025-08-10
2026	2026-06-30	2026-08-17

Every Fixed Threshold

Fixed thresholds at Superior
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	101	29	1961	12
35 C (95 F): Days	36	6	1936	3
40 C (104 F): Days	1	1	1936	1
90 F (32.2 C): Days	90	16	1948	7
100 F (37.8 C): Days	3	4	1936	2
0 C (32 F): Ice days (max	101	122	1972	51
0 C (32 F): Frost days (min	109	210	1961	106
-10 C (14 F): Days with min	109	111	1950	42
-20 C (-4 F): Days with min	109	52	1950	12
-30 C (-22 F): Days with min	75	10	1933	2
20 C (68 F): Tropical nights (min	72	15	1941	8
25 C (77 F): Days with min	3	2	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	113	36	1977	16
25 mm (0.98 in): Days with 25 mm or more rain	112	15	1991	2
50 mm (1.97 in): Days with 50 mm or more rain	66	3	1949	1
100 mm (3.94 in): Days with 100 mm or more rain	8	1	1924	1
10 cm (3.9 in): Days with 10 cm or more snowfall	92	9	1985	2
25 cm (9.8 in): Days with 25 cm or more snowfall	13	2	1965	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1910.

Download the Data

Data for Superior 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).

Superior Threshold Days by Year (USC00478349)

Key Facts for Superior Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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