Ironwood Threshold Days by Year (USC00204104)

20 fixed thresholds counted per year at Ironwood (USC00204104): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ironwood Thresholds

Ironwood: nights with a minimum temperature at or below 0 C (32 F) in 124 years, most in 1907 with 223.
Ironwood: nights with a minimum temperature at or below -10 C (14 F) in 124 years, most in 1989 with 117.
Ironwood: nights with a minimum temperature at or below -20 C (-4 F) in 124 years, most in 2014 with 55.
Ironwood: days with 10 mm (0.39 in) or more of precipitation in 124 years, most in 1943 with 44.
20 fixed thresholds have at least one qualifying day at Ironwood.

Days at or above 30 C (86 F)

122 years with a qualifying day

Days per year at Ironwood with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 1970.

Days at or above 30 C (86 F) per year at Ironwood
Year	Days	Decade average
1902	2	5.6
1903	3	5.6
1904	2	5.6
1905	3	5.6
1906	10	5.6
1907	4	5.6
1908	15	5.6
1909	6	5.6
1910	22	10.2
1911	14	10.2
1912	11	10.2
1913	13	10.2
1914	9	10.2
1915	1	10.2
1916	16	10.2
1917	7	10.2
1918	2	10.2
1919	7	10.2
1921	18	12.4
1922	13	12.4
1923	18	12.4
1924	2	12.4
1925	23	12.4
1926	10	12.4
1927	9	12.4
1928	4	12.4
1929	15	12.4
1930	14	20.1
1931	28	20.1
1932	13	20.1
1933	24	20.1
1934	20	20.1
1935	18	20.1
1936	22	20.1
1937	26	20.1
1938	9	20.1
1939	27	20.1
1940	22	20.3
1941	30	20.3
1942	13	20.3
1943	19	20.3
1944	15	20.3
1945	10	20.3
1946	12	20.3
1947	31	20.3
1948	26	20.3
1949	25	20.3
1950	8	10.7
1951	4	10.7
1952	18	10.7
1953	16	10.7
1954	7	10.7
1956	5	10.7
1957	14	10.7
1958	6	10.7
1959	18	10.7
1960	10	13.4
1961	17	13.4
1962	9	13.4
1963	19	13.4
1964	19	13.4
1965	8	13.4
1966	22	13.4
1967	4	13.4
1968	12	13.4
1969	14	13.4
1970	34	11.6
1971	11	11.6
1972	12	11.6
1973	7	11.6
1974	5	11.6
1975	13	11.6
1976	10	11.6
1977	11	11.6
1978	8	11.6
1979	5	11.6
1981	3	10.7
1982	2	10.7
1983	17	10.7
1984	3	10.7
1985	5	10.7
1986	7	10.7
1987	20	10.7
1988	30	10.7
1989	9	10.7
1990	1	5.4
1991	8	5.4
1992	2	5.4
1993	2	5.4
1994	1	5.4
1995	12	5.4
1996	5	5.4
1997	1	5.4
1998	10	5.4
1999	12	5.4
2000	2	9.4
2001	17	9.4
2002	16	9.4
2003	5	9.4
2004	2	9.4
2005	16	9.4
2006	12	9.4
2007	18	9.4
2008	3	9.4
2009	3	9.4
2010	8	6.8
2011	9	6.8
2012	14	6.8
2013	8	6.8
2014	2	6.8
2015	5	6.8
2016	6	6.8
2017	3	6.8
2018	11	6.8
2019	2	6.8
2020	9	10.3
2021	16	10.3
2022	6	10.3
2023	12	10.3
2024	5	10.3
2025	5	10.3
2026	19	10.3

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

First to last qualifying date each year at Ironwood
Year	First date	Last date
1902	1902-07-13	1902-08-01
1903	1903-07-08	1903-08-15
1904	1904-07-16	1904-07-17
1905	1905-07-16	1905-08-29
1906	1906-07-12	1906-09-10
1907	1907-06-16	1907-06-28
1908	1908-06-21	1908-09-21
1909	1909-06-20	1909-08-27
1910	1910-06-16	1910-08-21
1911	1911-05-18	1911-08-14
1912	1912-06-23	1912-09-08
1913	1913-06-13	1913-09-05
1914	1914-05-26	1914-08-09
1915	1915-07-13	1915-07-13
1916	1916-07-05	1916-08-19
1917	1917-07-21	1917-07-30
1918	1918-07-20	1918-07-21
1919	1919-05-28	1919-07-03
1921	1921-05-21	1921-09-01
1922	1922-05-10	1922-10-04
1923	1923-05-29	1923-09-27
1924	1924-08-26	1924-08-29
1925	1925-05-20	1925-09-04
1926	1926-05-07	1926-08-03
1927	1927-06-28	1927-09-14
1928	1928-07-16	1928-08-15
1929	1929-07-12	1929-09-04
1930	1930-05-20	1930-09-23
1931	1931-05-15	1931-09-12
1932	1932-05-14	1932-08-30
1933	1933-06-01	1933-09-05
1934	1934-05-28	1934-08-19
1935	1935-07-03	1935-09-24
1936	1936-07-06	1936-09-22
1937	1937-05-30	1937-09-23
1938	1938-06-21	1938-08-18
1939	1939-05-30	1939-09-16
1940	1940-06-02	1940-09-20
1941	1941-05-18	1941-09-02
1942	1942-06-04	1942-08-31
1943	1943-06-18	1943-08-23
1944	1944-05-29	1944-08-11
1945	1945-07-18	1945-09-07
1946	1946-05-29	1946-08-17
1947	1947-06-26	1947-09-10
1948	1948-06-02	1948-09-17
1949	1949-05-03	1949-08-27
1950	1950-05-23	1950-08-16
1951	1951-07-24	1951-07-29
1952	1952-04-28	1952-09-14
1953	1953-05-08	1953-10-02
1954	1954-06-09	1954-08-28
1956	1956-06-10	1956-08-29
1957	1957-06-17	1957-09-01
1958	1958-06-28	1958-08-10
1959	1959-05-02	1959-09-09
1960	1960-07-08	1960-09-07
1961	1961-06-11	1961-09-10
1962	1962-05-14	1962-08-28
1963	1963-06-04	1963-08-07
1964	1964-05-21	1964-08-02
1965	1965-07-22	1965-08-15
1966	1966-06-22	1966-09-01
1967	1967-07-20	1967-07-23
1968	1968-06-04	1968-08-24
1969	1969-05-27	1969-08-30
1970	1970-04-29	1970-09-06
1971	1971-06-04	1971-09-04
1972	1972-05-17	1972-07-23
1973	1973-06-16	1973-08-29
1974	1974-07-03	1974-07-14
1975	1975-05-21	1975-08-25
1976	1976-06-10	1976-09-13
1977	1977-05-14	1977-07-20
1978	1978-05-27	1978-09-10
1979	1979-06-15	1979-07-22
1981	1981-07-07	1981-07-09
1982	1982-07-06	1982-07-18
1983	1983-06-23	1983-09-03
1984	1984-08-07	1984-08-29
1985	1985-06-09	1985-09-19
1986	1986-05-30	1986-07-24
1987	1987-05-17	1987-09-06
1988	1988-05-29	1988-08-17
1989	1989-07-06	1989-08-05
1990	1990-07-04	1990-07-04
1991	1991-06-27	1991-08-30
1992	1992-08-10	1992-10-03
1993	1993-08-12	1993-08-26
1994	1994-05-21	1994-05-21
1995	1995-06-18	1995-08-31
1996	1996-06-13	1996-08-07
1997	1997-06-24	1997-06-24
1998	1998-05-15	1998-09-12
1999	1999-06-26	1999-09-04
2000	2000-05-06	2000-08-01
2001	2001-05-16	2001-08-09
2002	2002-05-31	2002-09-10
2003	2003-07-27	2003-09-09
2004	2004-06-08	2004-07-22
2005	2005-06-24	2005-09-12
2006	2006-05-29	2006-08-01
2007	2007-05-11	2007-09-06
2008	2008-07-12	2008-09-02
2009	2009-05-21	2009-08-15
2010	2010-05-26	2010-08-31
2011	2011-06-08	2011-07-23
2012	2012-05-20	2012-09-05
2013	2013-06-26	2013-08-27
2014	2014-05-31	2014-07-22
2015	2015-07-27	2015-09-06
2016	2016-05-07	2016-08-04
2017	2017-06-11	2017-09-25
2018	2018-05-27	2018-08-14
2019	2019-07-04	2019-07-16
2020	2020-06-09	2020-07-19
2021	2021-06-05	2021-08-24
2022	2022-05-14	2022-07-20
2023	2023-06-01	2023-09-06
2024	2024-06-19	2024-08-27
2025	2025-06-22	2025-07-28
2026	2026-07-01	2026-10-12

Every Fixed Threshold

Fixed thresholds at Ironwood
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	122	34	1970	19
35 C (95 F): Days	24	8	1936	1
40 C (104 F): Days	1	1	1936	1
90 F (32.2 C): Days	87	20	1931	6
100 F (37.8 C): Days	3	3	1936	2
0 C (32 F): Ice days (max	123	124	2014	58
0 C (32 F): Frost days (min	124	223	1907	115
-10 C (14 F): Days with min	124	117	1989	56
-20 C (-4 F): Days with min	124	55	2014	12
-30 C (-22 F): Days with min	98	20	1996	5
-40 C (-40 F): Days with min	3	1	1967	1
20 C (68 F): Tropical nights (min	101	13	1931	2
25 C (77 F): Days with min	5	2	1921	1
10 mm (0.39 in): Days with 10 mm or more rain	124	44	1943	18
25 mm (0.98 in): Days with 25 mm or more rain	124	14	1909	3
50 mm (1.97 in): Days with 50 mm or more rain	54	4	2013	1
100 mm (3.94 in): Days with 100 mm or more rain	5	3	1909	1
10 cm (3.9 in): Days with 10 cm or more snowfall	107	29	1976	9
25 cm (9.8 in): Days with 25 cm or more snowfall	72	7	1996	3
50 cm (19.7 in): Days with 50 cm or more snowfall	6	1	1922	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 Ironwood 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).

Ironwood Threshold Days by Year (USC00204104)

Key Facts for Ironwood Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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