Duluth Threshold Days by Year

17 fixed thresholds counted per year at Duluth (USW00014913): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Duluth Thresholds

Duluth: days with a maximum temperature at or below 0 C (32 F) in 79 years, most in 1972 with 139.
Duluth: nights with a minimum temperature at or below 0 C (32 F) in 79 years, most in 1972 with 204.
Duluth: nights with a minimum temperature at or below -10 C (14 F) in 79 years, most in 1955 with 122.
Duluth: nights with a minimum temperature at or below -20 C (-4 F) in 79 years, most in 1972 with 57.
17 fixed thresholds have at least one qualifying day at Duluth.

Days at or above 30 C (86 F)

77 years with a qualifying day

Days per year at Duluth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 25 in 1988.

Days at or above 30 C (86 F) per year at Duluth
Year	Days	Decade average
1948	15	13.5
1949	12	13.5
1950	4	7
1951	3	7
1952	8	7
1953	8	7
1954	5	7
1955	15	7
1956	5	7
1957	6	7
1958	4	7
1959	12	7
1960	6	7
1961	16	7
1962	1	7
1963	7	7
1964	12	7
1965	5	7
1966	5	7
1967	2	7
1968	3	7
1969	13	7
1970	15	6.5
1971	2	6.5
1972	3	6.5
1973	3	6.5
1974	6	6.5
1975	8	6.5
1976	13	6.5
1977	3	6.5
1978	10	6.5
1979	2	6.5
1980	8	9.8
1981	2	9.8
1982	1	9.8
1983	11	9.8
1984	9	9.8
1986	5	9.8
1987	11	9.8
1988	25	9.8
1989	16	9.8
1990	5	4.8
1991	9	4.8
1992	1	4.8
1993	4	4.8
1995	10	4.8
1996	3	4.8
1997	1	4.8
1998	4	4.8
1999	6	4.8
2000	3	7.8
2001	13	7.8
2002	11	7.8
2003	8	7.8
2004	2	7.8
2005	11	7.8
2006	14	7.8
2007	13	7.8
2008	1	7.8
2009	2	7.8
2010	7	8.4
2011	8	8.4
2012	15	8.4
2013	15	8.4
2014	1	8.4
2015	6	8.4
2016	5	8.4
2017	2	8.4
2018	14	8.4
2019	11	8.4
2020	13	10.4
2021	19	10.4
2022	4	10.4
2023	13	10.4
2024	7	10.4
2025	8	10.4
2026	9	10.4

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

First to last qualifying date each year at Duluth
Year	First date	Last date
1948	1948-06-02	1948-09-16
1949	1949-06-11	1949-08-26
1950	1950-07-28	1950-08-16
1951	1951-07-24	1951-07-29
1952	1952-04-27	1952-08-14
1953	1953-05-08	1953-10-02
1954	1954-06-29	1954-08-24
1955	1955-06-29	1955-08-20
1956	1956-06-09	1956-08-06
1957	1957-07-02	1957-08-08
1958	1958-07-23	1958-08-11
1959	1959-05-01	1959-08-25
1960	1960-07-08	1960-09-06
1961	1961-06-11	1961-09-09
1962	1962-06-28	1962-06-28
1963	1963-06-25	1963-08-06
1964	1964-05-21	1964-07-23
1965	1965-07-22	1965-08-13
1966	1966-06-29	1966-07-12
1967	1967-07-20	1967-07-21
1968	1968-06-04	1968-08-06
1969	1969-05-27	1969-08-28
1970	1970-06-08	1970-08-25
1971	1971-08-09	1971-09-02
1972	1972-05-17	1972-08-17
1973	1973-07-06	1973-08-28
1974	1974-07-07	1974-07-18
1975	1975-07-15	1975-08-01
1976	1976-06-06	1976-09-11
1977	1977-05-13	1977-07-19
1978	1978-06-10	1978-09-06
1979	1979-07-10	1979-07-11
1980	1980-05-04	1980-07-14
1981	1981-07-06	1981-07-08
1982	1982-07-05	1982-07-05
1983	1983-06-25	1983-09-02
1984	1984-07-02	1984-09-19
1986	1986-05-29	1986-07-18
1987	1987-06-13	1987-08-15
1988	1988-05-31	1988-08-16
1989	1989-07-02	1989-08-11
1990	1990-06-25	1990-08-16
1991	1991-07-16	1991-08-29
1992	1992-08-08	1992-08-08
1993	1993-06-21	1993-08-25
1995	1995-06-17	1995-07-30
1996	1996-06-12	1996-06-28
1997	1997-08-02	1997-08-02
1998	1998-07-13	1998-09-05
1999	1999-05-29	1999-08-27
2000	2000-06-08	2000-07-31
2001	2001-06-25	2001-08-08
2002	2002-05-30	2002-09-08
2003	2003-07-02	2003-08-24
2004	2004-07-19	2004-07-21
2005	2005-06-23	2005-08-08
2006	2006-07-08	2006-07-31
2007	2007-05-10	2007-09-06
2008	2008-07-06	2008-07-06
2009	2009-05-20	2009-06-23
2010	2010-05-25	2010-08-30
2011	2011-07-01	2011-08-02
2012	2012-05-18	2012-09-03
2013	2013-06-25	2013-09-06
2014	2014-07-21	2014-07-21
2015	2015-07-25	2015-08-15
2016	2016-05-06	2016-07-22
2017	2017-06-10	2017-07-05
2018	2018-05-16	2018-08-13
2019	2019-06-26	2019-08-04
2020	2020-06-16	2020-08-26
2021	2021-06-04	2021-08-23
2022	2022-06-20	2022-07-22
2023	2023-05-31	2023-09-05
2024	2024-07-12	2024-09-16
2025	2025-05-11	2025-08-07
2026	2026-06-30	2026-07-30

Every Fixed Threshold

Fixed thresholds at Duluth
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	77	25	1988	9
35 C (95 F): Days	7	3	1988	1
90 F (32.2 C): Days	52	9	1988	4
0 C (32 F): Ice days (max	79	139	1972	57
0 C (32 F): Frost days (min	79	204	1972	115
-10 C (14 F): Days with min	79	122	1955	50
-20 C (-4 F): Days with min	79	57	1972	23
-30 C (-22 F): Days with min	66	11	1948	3
20 C (68 F): Tropical nights (min	44	6	1975	5
25 C (77 F): Days with min	1	1	2013	1
10 mm (0.39 in): Days with 10 mm or more rain	79	34	1977	17
25 mm (0.98 in): Days with 25 mm or more rain	78	13	1949	5
50 mm (1.97 in): Days with 50 mm or more rain	48	3	1968	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	2012	1
10 cm (3.9 in): Days with 10 cm or more snowfall	78	16	2013	4
25 cm (9.8 in): Days with 25 cm or more snowfall	34	5	2007	2
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1950	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

Data for Duluth 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Duluth Threshold Days by Year

Key Facts for Duluth Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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