Ainsworth Threshold Days by Year (USC00250050)

21 fixed thresholds counted per year at Ainsworth (USC00250050): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ainsworth Thresholds

Ainsworth: days with 10 mm (0.39 in) or more of precipitation in 114 years, most in 1915 with 43.
Ainsworth: days with 25 mm (0.98 in) or more of precipitation in 112 years, most in 1915 with 12.
Ainsworth: nights with a minimum temperature at or below 0 C (32 F) in 111 years, most in 1909 with 176.
Ainsworth: nights with a minimum temperature at or below -10 C (14 F) in 111 years, most in 1929 with 86.
21 fixed thresholds have at least one qualifying day at Ainsworth.

Days at or above 30 C (86 F)

110 years with a qualifying day

Days per year at Ainsworth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 101 in 1934.

Days at or above 30 C (86 F) per year at Ainsworth
Year	Days	Decade average
1906	46	53.7
1908	59	53.7
1909	56	53.7
1910	76	55.9
1911	60	55.9
1912	51	55.9
1913	69	55.9
1914	42	55.9
1915	22	55.9
1919	71	55.9
1920	49	53.6
1921	64	53.6
1923	33	53.6
1924	30	53.6
1927	62	53.6
1928	69	53.6
1929	68	53.6
1933	82	83.2
1934	101	83.2
1935	70	83.2
1936	89	83.2
1938	71	83.2
1939	86	83.2
1940	78	64
1941	74	64
1942	54	64
1943	71	64
1944	57	64
1945	49	64
1946	66	64
1947	65	64
1948	67	64
1949	59	64
1950	33	60.6
1951	33	60.6
1952	67	60.6
1953	56	60.6
1954	67	60.6
1955	85	60.6
1956	85	60.6
1957	52	60.6
1958	59	60.6
1959	69	60.6
1960	53	56.4
1961	64	56.4
1962	43	56.4
1963	66	56.4
1964	67	56.4
1965	46	56.4
1966	65	56.4
1967	49	56.4
1968	60	56.4
1969	51	56.4
1970	81	62.7
1971	65	62.7
1972	57	62.7
1973	63	62.7
1974	64	62.7
1975	69	62.7
1976	64	62.7
1977	46	62.7
1978	65	62.7
1979	53	62.7
1980	79	57.1
1981	49	57.1
1982	46	57.1
1983	72	57.1
1984	53	57.1
1985	60	57.1
1986	38	57.1
1987	63	57.1
1988	65	57.1
1989	46	57.1
1990	55	42.4
1991	57	42.4
1992	21	42.4
1993	19	42.4
1994	40	42.4
1995	60	42.4
1996	32	42.4
1997	40	42.4
1998	51	42.4
1999	49	42.4
2000	65	52.4
2001	60	52.4
2002	72	52.4
2003	54	52.4
2004	38	52.4
2005	54	52.4
2006	60	52.4
2007	61	52.4
2008	29	52.4
2009	31	52.4
2010	54	54.2
2011	48	54.2
2012	88	54.2
2013	43	54.2
2014	33	54.2
2015	55	54.2
2016	53	54.2
2017	62	54.2
2018	57	54.2
2019	49	54.2
2020	79	69.1
2021	56	69.1
2022	82	69.1
2023	68	69.1
2024	65	69.1
2025	69	69.1
2026	65	69.1

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

First to last qualifying date each year at Ainsworth
Year	First date	Last date
1906	1906-04-24	1906-10-03
1908	1908-04-12	1908-10-15
1909	1909-05-04	1909-10-06
1910	1910-03-21	1910-10-16
1911	1911-05-09	1911-09-14
1912	1912-05-17	1912-09-08
1913	1913-05-27	1913-09-07
1914	1914-05-23	1914-09-27
1915	1915-05-10	1915-10-23
1919	1919-05-28	1919-10-07
1920	1920-06-11	1920-10-10
1921	1921-04-23	1921-09-23
1923	1923-04-25	1923-09-05
1924	1924-04-23	1924-10-11
1927	1927-04-26	1927-10-25
1928	1928-04-28	1928-10-10
1929	1929-05-14	1929-09-22
1933	1933-05-17	1933-10-29
1934	1934-04-29	1934-10-07
1935	1935-06-09	1935-09-24
1936	1936-04-13	1936-09-25
1938	1938-05-26	1938-10-04
1939	1939-04-22	1939-09-24
1940	1940-05-11	1940-10-25
1941	1941-05-13	1941-09-20
1942	1942-05-29	1942-10-10
1943	1943-03-29	1943-09-26
1944	1944-05-13	1944-09-26
1945	1945-06-21	1945-10-16
1946	1946-03-31	1946-09-26
1947	1947-06-26	1947-10-21
1948	1948-04-17	1948-09-19
1949	1949-04-25	1949-09-25
1950	1950-05-22	1950-10-30
1951	1951-06-16	1951-10-01
1952	1952-04-27	1952-09-30
1953	1953-05-25	1953-10-09
1954	1954-05-21	1954-10-08
1955	1955-04-26	1955-10-19
1956	1956-05-18	1956-10-16
1957	1957-05-07	1957-09-29
1958	1958-04-16	1958-10-19
1959	1959-05-01	1959-09-14
1960	1960-04-21	1960-09-20
1961	1961-05-10	1961-10-16
1962	1962-04-24	1962-10-14
1963	1963-04-01	1963-10-19
1964	1964-04-16	1964-10-15
1965	1965-04-29	1965-10-09
1966	1966-05-04	1966-09-11
1967	1967-05-09	1967-10-04
1968	1968-05-01	1968-10-30
1969	1969-05-25	1969-09-15
1970	1970-05-17	1970-10-05
1971	1971-06-10	1971-09-14
1972	1972-05-16	1972-09-20
1973	1973-05-18	1973-09-10
1974	1974-06-03	1974-10-10
1975	1975-05-04	1975-10-04
1976	1976-05-19	1976-09-30
1977	1977-04-09	1977-09-08
1978	1978-03-30	1978-10-20
1979	1979-05-06	1979-09-30
1980	1980-04-20	1980-10-09
1981	1981-04-26	1981-09-19
1982	1982-06-28	1982-09-22
1983	1983-05-26	1983-10-27
1984	1984-05-31	1984-09-21
1985	1985-04-11	1985-09-18
1986	1986-04-23	1986-08-30
1987	1987-04-17	1987-09-26
1988	1988-04-07	1988-09-25
1989	1989-04-21	1989-10-01
1990	1990-04-22	1990-10-05
1991	1991-04-06	1991-10-16
1992	1992-04-30	1992-10-02
1993	1993-06-21	1993-10-06
1994	1994-05-23	1994-09-15
1995	1995-06-06	1995-10-12
1996	1996-05-16	1996-10-12
1997	1997-05-16	1997-10-02
1998	1998-05-17	1998-09-28
1999	1999-06-04	1999-09-26
2000	2000-05-04	2000-09-19
2001	2001-05-13	2001-10-02
2002	2002-05-29	2002-09-09
2003	2003-04-14	2003-10-19
2004	2004-04-28	2004-09-19
2005	2005-06-20	2005-09-30
2006	2006-05-18	2006-10-07
2007	2007-04-29	2007-10-06
2008	2008-06-14	2008-09-26
2009	2009-04-23	2009-08-25
2010	2010-05-22	2010-10-09
2011	2011-05-09	2011-10-05
2012	2012-04-01	2012-09-16
2013	2013-05-13	2013-09-30
2014	2014-05-28	2014-09-26
2015	2015-06-09	2015-10-11
2016	2016-05-06	2016-09-23
2017	2017-05-07	2017-09-22
2018	2018-05-25	2018-09-23
2019	2019-04-20	2019-09-17
2020	2020-05-31	2020-10-06
2021	2021-04-05	2021-09-28
2022	2022-04-22	2022-10-22
2023	2023-04-11	2023-10-02
2024	2024-04-13	2024-10-11
2025	2025-04-16	2025-10-04
2026	2026-03-21	2026-10-07

Every Fixed Threshold

Fixed thresholds at Ainsworth
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	110	101	1934	65
35 C (95 F): Days	109	52	1936	9
40 C (104 F): Days	37	23	1936	2
45 C (113 F): Days	1	2	1934	2
90 F (32.2 C): Days	110	77	1934	35
100 F (37.8 C): Days	87	38	1936	4
110 F (43.3 C): Days	3	6	1934	1
0 C (32 F): Ice days (max	110	78	1978	16
0 C (32 F): Frost days (min	111	176	1909	87
-10 C (14 F): Days with min	111	86	1929	22
-20 C (-4 F): Days with min	110	36	1936	9
-30 C (-22 F): Days with min	26	8	1936	1
20 C (68 F): Tropical nights (min	109	39	1936	13
25 C (77 F): Days with min	12	10	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	114	43	1915	16
25 mm (0.98 in): Days with 25 mm or more rain	112	12	1915	4
50 mm (1.97 in): Days with 50 mm or more rain	69	4	1920	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1962	1
10 cm (3.9 in): Days with 10 cm or more snowfall	83	7	1924	2
25 cm (9.8 in): Days with 25 cm or more snowfall	17	2	1920	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1972	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

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Data for Ainsworth 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Ainsworth Threshold Days by Year (USC00250050)

Key Facts for Ainsworth Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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