O'Neill Threshold Days by Year (USC00256290)

19 fixed thresholds counted per year at O'Neill (USC00256290): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for O'Neill Thresholds

O'Neill: nights with a minimum temperature at or below 0 C (32 F) in 112 years, most in 2013 with 184.
O'Neill: nights with a minimum temperature at or below -10 C (14 F) in 112 years, most in 1955 with 86.
O'Neill: nights with a minimum temperature at or below -20 C (-4 F) in 112 years, most in 1916 with 41.
O'Neill: nights with a minimum temperature at or above 20 C (68 F) in 112 years, most in 1931 with 37.
19 fixed thresholds have at least one qualifying day at O'Neill.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at O'Neill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 107 in 1939.

Days at or above 30 C (86 F) per year at O'Neill
Year	Days	Decade average
1897	55	54.5
1899	54	54.5
1900	74	75.5
1901	77	75.5
1916	65	68.5
1919	72	68.5
1920	62	65.9
1921	80	65.9
1922	82	65.9
1923	40	65.9
1924	43	65.9
1925	77	65.9
1926	71	65.9
1927	63	65.9
1928	71	65.9
1929	70	65.9
1930	75	86.7
1931	99	86.7
1932	80	86.7
1933	84	86.7
1934	100	86.7
1935	73	86.7
1936	101	86.7
1937	81	86.7
1938	67	86.7
1939	107	86.7
1940	78	55.2
1941	62	55.2
1942	50	55.2
1943	59	55.2
1944	45	55.2
1945	42	55.2
1946	46	55.2
1947	57	55.2
1948	64	55.2
1949	49	55.2
1952	71	64.5
1953	62	64.5
1954	63	64.5
1955	73	64.5
1956	68	64.5
1957	55	64.5
1958	51	64.5
1959	73	64.5
1960	51	51.7
1961	58	51.7
1962	31	51.7
1963	64	51.7
1964	49	51.7
1965	35	51.7
1966	54	51.7
1967	43	51.7
1968	73	51.7
1969	59	51.7
1970	91	61.4
1971	64	61.4
1972	60	61.4
1973	56	61.4
1974	56	61.4
1975	53	61.4
1976	64	61.4
1977	54	61.4
1978	62	61.4
1979	54	61.4
1980	92	68
1981	64	68
1982	49	68
1983	74	68
1984	62	68
1987	71	68
1988	74	68
1989	58	68
1990	61	51
1991	72	51
1992	21	51
1993	31	51
1994	54	51
1995	60	51
1996	44	51
1997	58	51
1998	60	51
1999	49	51
2000	73	61
2001	64	61
2002	73	61
2003	65	61
2004	47	61
2005	71	61
2006	65	61
2007	70	61
2008	49	61
2009	33	61
2010	51	50.9
2011	51	50.9
2012	87	50.9
2013	52	50.9
2014	31	50.9
2015	48	50.9
2016	52	50.9
2017	48	50.9
2018	51	50.9
2019	38	50.9
2020	67	60.1
2021	64	60.1
2022	72	60.1
2023	53	60.1
2024	46	60.1
2025	56	60.1
2026	63	60.1

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

First to last qualifying date each year at O'Neill
Year	First date	Last date
1897	1897-06-12	1897-10-03
1899	1899-04-12	1899-10-01
1900	1900-05-11	1900-10-14
1901	1901-04-26	1901-09-24
1916	1916-04-11	1916-10-03
1919	1919-06-16	1919-09-27
1920	1920-06-08	1920-10-09
1921	1921-05-22	1921-10-15
1922	1922-05-09	1922-10-27
1923	1923-04-19	1923-09-05
1924	1924-04-14	1924-10-01
1925	1925-05-19	1925-09-29
1926	1926-04-29	1926-09-16
1927	1927-04-26	1927-10-26
1928	1928-05-01	1928-10-11
1929	1929-04-04	1929-10-15
1930	1930-04-09	1930-10-10
1931	1931-05-15	1931-10-20
1932	1932-05-13	1932-10-02
1933	1933-05-17	1933-10-14
1934	1934-04-29	1934-10-07
1935	1935-06-09	1935-10-17
1936	1936-04-13	1936-09-26
1937	1937-05-24	1937-10-29
1938	1938-06-05	1938-10-05
1939	1939-04-22	1939-10-06
1940	1940-04-14	1940-10-25
1941	1941-05-14	1941-09-21
1942	1942-05-27	1942-10-07
1943	1943-03-29	1943-09-18
1944	1944-05-14	1944-09-17
1945	1945-06-14	1945-10-17
1946	1946-04-01	1946-09-27
1947	1947-06-27	1947-10-22
1948	1948-04-18	1948-09-21
1949	1949-04-26	1949-09-17
1952	1952-04-27	1952-09-30
1953	1953-05-09	1953-10-02
1954	1954-04-14	1954-09-26
1955	1955-05-01	1955-10-09
1956	1956-05-10	1956-10-16
1957	1957-06-05	1957-09-01
1958	1958-05-11	1958-10-19
1959	1959-05-01	1959-09-09
1960	1960-04-21	1960-09-20
1961	1961-05-31	1961-09-09
1962	1962-04-24	1962-08-28
1963	1963-04-01	1963-10-19
1964	1964-04-16	1964-09-09
1965	1965-04-29	1965-08-25
1966	1966-05-04	1966-08-30
1967	1967-05-22	1967-10-04
1968	1968-03-30	1968-10-13
1969	1969-05-14	1969-09-15
1970	1970-05-07	1970-10-04
1971	1971-06-10	1971-09-14
1972	1972-04-06	1972-09-20
1973	1973-05-20	1973-09-10
1974	1974-06-03	1974-09-27
1975	1975-05-04	1975-10-04
1976	1976-05-19	1976-09-30
1977	1977-04-09	1977-09-09
1978	1978-05-24	1978-10-20
1979	1979-05-28	1979-09-30
1980	1980-04-20	1980-10-09
1981	1981-04-25	1981-09-20
1982	1982-06-23	1982-09-28
1983	1983-05-27	1983-09-28
1984	1984-05-31	1984-09-20
1987	1987-04-17	1987-09-26
1988	1988-04-07	1988-09-25
1989	1989-04-21	1989-10-13
1990	1990-04-22	1990-10-05
1991	1991-04-06	1991-10-16
1992	1992-04-30	1992-10-02
1993	1993-06-10	1993-10-06
1994	1994-04-18	1994-09-20
1995	1995-06-06	1995-10-11
1996	1996-05-16	1996-09-10
1997	1997-05-16	1997-10-02
1998	1998-05-14	1998-09-29
1999	1999-05-27	1999-09-24
2000	2000-05-04	2000-09-30
2001	2001-04-28	2001-10-28
2002	2002-04-15	2002-09-16
2003	2003-04-14	2003-10-19
2004	2004-04-28	2004-09-19
2005	2005-05-20	2005-10-18
2006	2006-04-13	2006-10-07
2007	2007-04-29	2007-10-06
2008	2008-06-11	2008-09-27
2009	2009-04-24	2009-08-25
2010	2010-05-23	2010-10-09
2011	2011-05-09	2011-10-05
2012	2012-04-02	2012-10-04
2013	2013-04-29	2013-10-01
2014	2014-05-28	2014-09-27
2015	2015-06-10	2015-10-12
2016	2016-05-07	2016-10-28
2017	2017-05-08	2017-09-23
2018	2018-05-24	2018-10-04
2019	2019-04-21	2019-09-18
2020	2020-06-02	2020-10-07
2021	2021-04-06	2021-09-29
2022	2022-04-23	2022-10-23
2023	2023-04-13	2023-10-03
2024	2024-04-14	2024-10-03
2025	2025-05-10	2025-10-05
2026	2026-03-22	2026-10-10

Every Fixed Threshold

Fixed thresholds at O'Neill
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	107	1939	63
35 C (95 F): Days	109	57	1934	13
40 C (104 F): Days	44	26	1936	2
90 F (32.2 C): Days	109	81	1934	39
100 F (37.8 C): Days	88	41	1936	5
110 F (43.3 C): Days	6	4	1936	1
0 C (32 F): Ice days (max	109	90	1978	21
0 C (32 F): Frost days (min	112	184	2013	98
-10 C (14 F): Days with min	112	86	1955	26
-20 C (-4 F): Days with min	112	41	1916	5
-30 C (-22 F): Days with min	43	8	1936	2
20 C (68 F): Tropical nights (min	112	37	1931	11
25 C (77 F): Days with min	17	4	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	105	35	2018	17
25 mm (0.98 in): Days with 25 mm or more rain	105	14	2018	2
50 mm (1.97 in): Days with 50 mm or more rain	59	4	2017	1
100 mm (3.94 in): Days with 100 mm or more rain	7	1	1937	1
10 cm (3.9 in): Days with 10 cm or more snowfall	74	8	1924	3
25 cm (9.8 in): Days with 25 cm or more snowfall	16	4	1984	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

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Data for O'Neill 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).

O'Neill Threshold Days by Year (USC00256290)

Key Facts for O'Neill Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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