Decorah Threshold Days by Year (USC00132110)

21 fixed thresholds counted per year at Decorah (USC00132110): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Decorah Thresholds

Decorah: nights with a minimum temperature at or below 0 C (32 F) in 122 years, most in 1917 with 186.
Decorah: nights with a minimum temperature at or below -10 C (14 F) in 122 years, most in 1978 with 92.
Decorah: nights with a minimum temperature at or below -20 C (-4 F) in 122 years, most in 1917 with 43.
Decorah: nights with a minimum temperature at or above 20 C (68 F) in 122 years, most in 1931 with 28.
21 fixed thresholds have at least one qualifying day at Decorah.

Days at or above 30 C (86 F)

120 years with a qualifying day

Days per year at Decorah with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 1901.

Days at or above 30 C (86 F) per year at Decorah
Year	Days	Decade average
1895	52	39.4
1896	32	39.4
1897	42	39.4
1898	35	39.4
1899	36	39.4
1900	53	32.9
1901	71	32.9
1902	15	32.9
1903	8	32.9
1904	13	32.9
1905	24	32.9
1906	39	32.9
1907	20	32.9
1908	53	32.9
1910	70	44.3
1911	70	44.3
1912	35	44.3
1914	53	44.3
1915	7	44.3
1916	49	44.3
1917	23	44.3
1918	37	44.3
1919	55	44.3
1920	19	32.8
1922	35	32.8
1923	48	32.8
1924	15	32.8
1925	32	32.8
1926	35	32.8
1927	38	32.8
1928	34	32.8
1929	39	32.8
1930	45	56.5
1931	64	56.5
1932	38	56.5
1933	61	56.5
1934	64	56.5
1935	53	56.5
1936	68	56.5
1937	63	56.5
1938	45	56.5
1939	64	56.5
1949	67	67
1950	26	33.7
1951	10	33.7
1952	45	33.7
1953	36	33.7
1954	36	33.7
1955	55	33.7
1956	36	33.7
1957	29	33.7
1958	24	33.7
1959	40	33.7
1960	25	31.8
1961	32	31.8
1962	21	31.8
1963	45	31.8
1964	51	31.8
1965	26	31.8
1966	41	31.8
1967	24	31.8
1968	27	31.8
1969	26	31.8
1970	41	25.7
1971	28	25.7
1972	24	25.7
1973	17	25.7
1974	16	25.7
1975	35	25.7
1976	32	25.7
1977	24	25.7
1978	28	25.7
1979	12	25.7
1980	30	34.9
1981	14	34.9
1982	15	34.9
1983	47	34.9
1984	32	34.9
1985	31	34.9
1986	29	34.9
1987	51	34.9
1988	71	34.9
1989	29	34.9
1990	23	27.3
1991	46	27.3
1992	12	27.3
1993	10	27.3
1994	21	27.3
1995	46	27.3
1996	20	27.3
1997	25	27.3
1998	36	27.3
1999	34	27.3
2000	23	32.6
2001	48	32.6
2002	51	32.6
2003	35	32.6
2004	17	32.6
2005	48	32.6
2006	32	32.6
2007	44	32.6
2008	14	32.6
2009	14	32.6
2010	39	36.8
2011	43	36.8
2012	69	36.8
2013	35	36.8
2014	17	36.8
2015	24	36.8
2016	31	36.8
2017	37	36.8
2018	43	36.8
2019	30	36.8
2020	51	49.6
2021	56	49.6
2022	40	49.6
2023	63	49.6
2024	47	49.6
2025	44	49.6
2026	46	49.6

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

First to last qualifying date each year at Decorah
Year	First date	Last date
1895	1895-04-30	1895-09-21
1896	1896-05-06	1896-08-09
1897	1897-05-06	1897-10-15
1898	1898-06-03	1898-09-28
1899	1899-06-04	1899-09-06
1900	1900-05-12	1900-09-10
1901	1901-04-29	1901-09-06
1902	1902-04-21	1902-08-30
1903	1903-05-23	1903-07-28
1904	1904-05-22	1904-10-10
1905	1905-06-04	1905-08-29
1906	1906-05-17	1906-09-16
1907	1907-05-12	1907-09-01
1908	1908-05-17	1908-09-22
1910	1910-04-28	1910-09-07
1911	1911-05-09	1911-09-16
1912	1912-06-24	1912-09-09
1914	1914-04-26	1914-09-19
1915	1915-06-05	1915-07-15
1916	1916-05-07	1916-09-07
1917	1917-05-19	1917-08-27
1918	1918-05-04	1918-08-26
1919	1919-05-28	1919-09-20
1920	1920-06-08	1920-09-18
1922	1922-05-10	1922-09-08
1923	1923-05-29	1923-08-19
1924	1924-06-12	1924-08-30
1925	1925-05-22	1925-09-19
1926	1926-05-24	1926-09-17
1927	1927-06-24	1927-09-17
1928	1928-05-02	1928-08-28
1929	1929-05-28	1929-09-27
1930	1930-04-10	1930-09-23
1931	1931-05-27	1931-09-20
1932	1932-05-14	1932-08-30
1933	1933-06-01	1933-09-09
1934	1934-05-05	1934-09-01
1935	1935-06-11	1935-09-24
1936	1936-05-06	1936-09-22
1937	1937-05-29	1937-10-29
1938	1938-05-03	1938-10-09
1939	1939-04-24	1939-09-28
1949	1949-05-03	1949-09-02
1950	1950-06-06	1950-09-18
1951	1951-07-07	1951-08-30
1952	1952-04-28	1952-09-30
1953	1953-05-29	1953-10-02
1954	1954-06-11	1954-09-18
1955	1955-05-02	1955-09-19
1956	1956-05-12	1956-08-28
1957	1957-06-16	1957-09-01
1958	1958-06-28	1958-09-03
1959	1959-05-02	1959-09-08
1960	1960-06-18	1960-09-07
1961	1961-05-31	1961-09-10
1962	1962-05-16	1962-09-12
1963	1963-06-02	1963-10-07
1964	1964-04-16	1964-09-09
1965	1965-05-02	1965-08-18
1966	1966-05-26	1966-09-01
1967	1967-05-18	1967-08-16
1968	1968-04-30	1968-09-03
1969	1969-05-27	1969-08-31
1970	1970-04-29	1970-09-20
1971	1971-06-04	1971-09-07
1972	1972-05-20	1972-08-29
1973	1973-06-08	1973-09-02
1974	1974-07-01	1974-08-26
1975	1975-05-19	1975-10-13
1976	1976-06-08	1976-10-01
1977	1977-06-04	1977-08-27
1978	1978-05-25	1978-09-11
1979	1979-07-09	1979-09-05
1980	1980-04-21	1980-09-09
1981	1981-06-05	1981-08-12
1982	1982-06-28	1982-08-16
1983	1983-06-21	1983-10-02
1984	1984-06-05	1984-09-24
1985	1985-04-18	1985-09-20
1986	1986-05-31	1986-09-27
1987	1987-04-20	1987-09-05
1988	1988-05-21	1988-09-18
1989	1989-06-06	1989-08-23
1990	1990-06-12	1990-09-12
1991	1991-04-06	1991-09-08
1992	1992-05-01	1992-08-24
1993	1993-06-22	1993-08-27
1994	1994-04-18	1994-09-15
1995	1995-06-16	1995-08-31
1996	1996-05-17	1996-09-05
1997	1997-06-22	1997-10-07
1998	1998-05-14	1998-09-26
1999	1999-06-06	1999-09-04
2000	2000-05-05	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	2004-04-29	2004-09-04
2005	2005-06-06	2005-10-05
2006	2006-05-28	2006-08-24
2007	2007-04-29	2007-10-07
2008	2008-06-07	2008-09-02
2009	2009-04-24	2009-08-15
2010	2010-05-23	2010-10-10
2011	2011-05-10	2011-09-12
2012	2012-05-18	2012-09-12
2013	2013-05-14	2013-09-11
2014	2014-05-30	2014-09-01
2015	2015-06-09	2015-09-07
2016	2016-05-06	2016-09-07
2017	2017-05-16	2017-09-25
2018	2018-05-24	2018-09-18
2019	2019-05-31	2019-10-01
2020	2020-05-26	2020-09-07
2021	2021-05-01	2021-09-20
2022	2022-05-10	2022-09-21
2023	2023-04-12	2023-10-03
2024	2024-05-18	2024-10-06
2025	2025-05-15	2025-10-05
2026	2026-05-15	2026-10-13

Every Fixed Threshold

Fixed thresholds at Decorah
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	120	71	1901	46
35 C (95 F): Days	76	35	1910	2
40 C (104 F): Days	8	7	1936	2
90 F (32.2 C): Days	117	58	1910	16
100 F (37.8 C): Days	21	19	1936	2
110 F (43.3 C): Days	1	1	1936	1
0 C (32 F): Ice days (max	120	97	1975	32
0 C (32 F): Frost days (min	122	186	1917	90
-10 C (14 F): Days with min	122	92	1978	33
-20 C (-4 F): Days with min	122	43	1917	9
-30 C (-22 F): Days with min	76	10	1936	1
-40 C (-40 F): Days with min	2	1	1951	1
20 C (68 F): Tropical nights (min	122	28	1931	18
25 C (77 F): Days with min	27	3	1911	2
10 mm (0.39 in): Days with 10 mm or more rain	119	43	2007	31
25 mm (0.98 in): Days with 25 mm or more rain	119	17	2018	9
50 mm (1.97 in): Days with 50 mm or more rain	89	8	2016	2
100 mm (3.94 in): Days with 100 mm or more rain	12	1	1928	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	2016	1
10 cm (3.9 in): Days with 10 cm or more snowfall	87	9	1959	1
25 cm (9.8 in): Days with 25 cm or more snowfall	18	1	1917	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

Download the Data

Data for Decorah 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).

Decorah Threshold Days by Year (USC00132110)

Key Facts for Decorah Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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