Superior Threshold Days by Year (USC00258320)

18 fixed thresholds counted per year at Superior (USC00258320): 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 107 years, most in 1951 with 35.
Superior: days with 25 mm (0.98 in) or more of precipitation in 106 years, most in 1896 with 17.
Superior: days with 50 mm (1.97 in) or more of precipitation in 75 years, most in 1973 with 7.
Superior: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 1980 with 102.
18 fixed thresholds have at least one qualifying day at Superior.

Days at or above 30 C (86 F)

62 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 102 in 1980.

Days at or above 30 C (86 F) per year at Superior
Year	Days	Decade average
1902	59	59.6
1903	54	59.6
1904	48	59.6
1906	68	59.6
1907	69	59.6
1966	65	62.5
1967	54	62.5
1968	70	62.5
1969	61	62.5
1970	91	77
1971	79	77
1972	70	77
1973	72	77
1974	63	77
1975	73	77
1976	76	77
1977	73	77
1978	88	77
1979	85	77
1980	102	76.6
1981	71	76.6
1982	55	76.6
1983	88	76.6
1984	81	76.6
1985	66	76.6
1986	69	76.6
1987	78	76.6
1988	93	76.6
1989	63	76.6
1990	76	74.9
1991	91	74.9
1992	50	74.9
1993	62	74.9
1994	89	74.9
1995	76	74.9
1996	64	74.9
1997	78	74.9
1998	92	74.9
1999	71	74.9
2000	98	78.4
2001	86	78.4
2002	98	78.4
2003	82	78.4
2004	64	78.4
2005	89	78.4
2006	92	78.4
2007	71	78.4
2008	52	78.4
2009	52	78.4
2010	87	74.6
2011	78	74.6
2013	80	74.6
2014	64	74.6
2015	64	74.6
2017	65	74.6
2018	84	74.6
2021	81	86.2
2022	90	86.2
2023	81	86.2
2024	85	86.2
2025	79	86.2
2026	101	86.2

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
1902	1902-04-21	1902-09-20
1903	1903-05-21	1903-10-03
1904	1904-05-22	1904-10-09
1906	1906-04-23	1906-10-12
1907	1907-03-19	1907-09-25
1966	1966-05-04	1966-09-24
1967	1967-03-23	1967-09-25
1968	1968-03-30	1968-09-22
1969	1969-05-27	1969-10-03
1970	1970-04-27	1970-10-04
1971	1971-03-31	1971-09-29
1972	1972-03-11	1972-10-01
1973	1973-05-18	1973-09-02
1974	1974-05-27	1974-09-27
1975	1975-05-17	1975-10-13
1976	1976-03-25	1976-10-02
1977	1977-05-04	1977-09-23
1978	1978-03-31	1978-10-20
1979	1979-05-16	1979-10-11
1980	1980-04-20	1980-10-09
1981	1981-04-02	1981-09-29
1982	1982-06-06	1982-09-29
1983	1983-05-24	1983-10-01
1984	1984-05-24	1984-09-23
1985	1985-04-17	1985-09-18
1986	1986-03-28	1986-09-28
1987	1987-04-18	1987-10-04
1988	1988-05-12	1988-10-14
1989	1989-04-21	1989-10-13
1990	1990-04-22	1990-10-05
1991	1991-04-05	1991-10-17
1992	1992-04-14	1992-10-03
1993	1993-05-14	1993-10-06
1994	1994-04-17	1994-09-30
1995	1995-06-06	1995-10-12
1996	1996-04-11	1996-09-11
1997	1997-04-18	1997-10-06
1998	1998-05-13	1998-09-28
1999	1999-05-09	1999-10-12
2000	2000-04-05	2000-10-01
2001	2001-04-26	2001-10-02
2002	2002-04-14	2002-10-01
2003	2003-04-01	2003-10-22
2004	2004-04-16	2004-09-21
2005	2005-05-11	2005-10-19
2006	2006-04-14	2006-11-09
2007	2007-04-30	2007-10-07
2008	2008-05-19	2008-09-29
2009	2009-04-23	2009-09-28
2010	2010-05-23	2010-10-09
2011	2011-04-10	2011-10-25
2013	2013-05-15	2013-10-05
2014	2014-05-07	2014-09-30
2015	2015-03-17	2015-10-21
2017	2017-04-20	2017-09-24
2018	2018-05-06	2018-10-04
2021	2021-04-05	2021-10-09
2022	2022-03-30	2022-10-24
2023	2023-04-13	2023-10-21
2024	2024-04-14	2024-10-12
2025	2025-03-28	2025-10-13
2026	2026-03-20	2026-10-13

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	62	102	1980	101
35 C (95 F): Days	61	58	2000	25
40 C (104 F): Days	27	8	2023	1
90 F (32.2 C): Days	62	85	2000	58
100 F (37.8 C): Days	54	20	2000	11
0 C (32 F): Ice days (max	62	60	1978	14
0 C (32 F): Frost days (min	61	175	1907	83
-10 C (14 F): Days with min	61	74	2022	23
-20 C (-4 F): Days with min	56	17	1979	5
-30 C (-22 F): Days with min	4	3	2021	1
20 C (68 F): Tropical nights (min	61	52	1983	36
25 C (77 F): Days with min	21	4	1980	1
10 mm (0.39 in): Days with 10 mm or more rain	107	35	1951	21
25 mm (0.98 in): Days with 25 mm or more rain	106	17	1896	10
50 mm (1.97 in): Days with 50 mm or more rain	75	7	1973	2
100 mm (3.94 in): Days with 100 mm or more rain	10	1	1903	1
10 cm (3.9 in): Days with 10 cm or more snowfall	61	5	1952	2
25 cm (9.8 in): Days with 25 cm or more snowfall	8	1	1945	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

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 (USC00258320)

Key Facts for Superior Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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