Eureka Threshold Days by Year (USC00392797)

21 fixed thresholds counted per year at Eureka (USC00392797): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Eureka Thresholds

Eureka: days with 10 mm (0.39 in) or more of precipitation in 117 years, most in 1957 with 22.
Eureka: nights with a minimum temperature at or below 0 C (32 F) in 116 years, most in 1917 with 218.
Eureka: nights with a minimum temperature at or below -10 C (14 F) in 116 years, most in 1955 with 119.
Eureka: nights with a minimum temperature at or below -20 C (-4 F) in 116 years, most in 1917 with 67.
21 fixed thresholds have at least one qualifying day at Eureka.

Days at or above 30 C (86 F)

104 years with a qualifying day

Days per year at Eureka with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 87 in 1936.

Days at or above 30 C (86 F) per year at Eureka
Year	Days	Decade average
1909	43	43
1910	55	43.3
1911	50	43.3
1912	38	43.3
1913	59	43.3
1914	50	43.3
1915	13	43.3
1916	37	43.3
1917	39	43.3
1918	41	43.3
1919	51	43.3
1920	34	35.5
1921	52	35.5
1922	50	35.5
1923	24	35.5
1924	15	35.5
1925	43	35.5
1926	42	35.5
1927	14	35.5
1928	25	35.5
1929	56	35.5
1930	50	63.2
1931	63	63.2
1932	45	63.2
1933	76	63.2
1934	83	63.2
1935	51	63.2
1936	87	63.2
1937	66	63.2
1938	53	63.2
1939	58	63.2
1940	51	42
1941	58	42
1942	21	42
1943	50	42
1944	31	42
1945	37	42
1946	29	42
1947	48	42
1948	46	42
1949	49	42
1950	35	40.1
1951	15	40.1
1952	60	40.1
1953	30	40.1
1954	37	40.1
1955	65	40.1
1956	27	40.1
1957	31	40.1
1958	37	40.1
1959	64	40.1
1960	37	35.9
1961	55	35.9
1962	25	35.9
1963	34	35.9
1964	32	35.9
1965	25	35.9
1966	43	35.9
1967	45	35.9
1968	27	35.9
1969	36	35.9
1970	52	43.1
1971	34	43.1
1972	39	43.1
1973	56	43.1
1974	42	43.1
1975	34	43.1
1976	58	43.1
1977	42	43.1
1978	36	43.1
1979	38	43.1
1980	60	55.5
1981	34	55.5
1988	79	55.5
1989	49	55.5
1990	42	28.3
1991	32	28.3
1992	15	28.3
1999	24	28.3
2000	29	34
2001	38	34
2002	53	34
2003	40	34
2004	16	34
2005	41	34
2006	53	34
2007	37	34
2008	21	34
2009	12	34
2010	38	29.3
2011	32	29.3
2012	53	29.3
2014	15	29.3
2016	25	29.3
2017	31	29.3
2018	29	29.3
2019	11	29.3
2020	31	32.7
2021	54	32.7
2022	26	32.7
2023	26	32.7
2024	24	32.7
2025	26	32.7
2026	42	32.7

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

First to last qualifying date each year at Eureka
Year	First date	Last date
1909	1909-05-04	1909-10-06
1910	1910-04-27	1910-10-16
1911	1911-05-09	1911-09-16
1912	1912-05-09	1912-10-04
1913	1913-04-15	1913-09-09
1914	1914-06-18	1914-10-17
1915	1915-04-14	1915-09-05
1916	1916-05-06	1916-09-30
1917	1917-05-16	1917-09-23
1918	1918-05-04	1918-09-12
1919	1919-05-28	1919-09-17
1920	1920-06-08	1920-10-07
1921	1921-06-11	1921-09-01
1922	1922-06-05	1922-10-03
1923	1923-06-02	1923-09-21
1924	1924-07-10	1924-09-04
1925	1925-05-19	1925-09-19
1926	1926-04-15	1926-09-16
1927	1927-06-27	1927-09-14
1928	1928-05-07	1928-09-07
1929	1929-05-25	1929-09-22
1930	1930-06-19	1930-09-19
1931	1931-05-15	1931-09-29
1932	1932-05-13	1932-09-14
1933	1933-05-17	1933-10-14
1934	1934-04-28	1934-10-12
1935	1935-06-13	1935-09-23
1936	1936-05-05	1936-10-08
1937	1937-05-28	1937-10-03
1938	1938-04-30	1938-09-26
1939	1939-05-15	1939-09-19
1940	1940-05-11	1940-09-19
1941	1941-05-13	1941-09-20
1942	1942-04-14	1942-09-11
1943	1943-05-29	1943-10-11
1944	1944-05-23	1944-09-08
1945	1945-06-21	1945-09-07
1946	1946-06-06	1946-09-15
1947	1947-07-03	1947-10-21
1948	1948-05-18	1948-09-18
1949	1949-05-12	1949-09-25
1950	1950-05-22	1950-10-30
1951	1951-07-14	1951-10-01
1952	1952-04-26	1952-09-29
1953	1953-06-12	1953-10-01
1954	1954-06-14	1954-09-01
1955	1955-05-02	1955-10-10
1956	1956-06-05	1956-10-12
1957	1957-07-01	1957-08-31
1958	1958-05-11	1958-10-19
1959	1959-05-01	1959-09-14
1960	1960-06-26	1960-10-08
1961	1961-06-05	1961-09-18
1962	1962-04-24	1962-10-14
1963	1963-05-07	1963-10-04
1964	1964-05-20	1964-10-15
1965	1965-07-07	1965-08-20
1966	1966-05-04	1966-09-12
1967	1967-05-22	1967-09-23
1968	1968-04-30	1968-09-14
1969	1969-05-14	1969-09-14
1970	1970-05-17	1970-10-05
1971	1971-06-18	1971-09-14
1972	1972-05-15	1972-09-20
1973	1973-05-15	1973-09-01
1974	1974-06-19	1974-09-26
1975	1975-06-29	1975-10-07
1976	1976-06-07	1976-09-30
1977	1977-04-09	1977-09-05
1978	1978-06-24	1978-09-25
1979	1979-05-28	1979-09-27
1980	1980-04-20	1980-09-30
1981	1981-06-26	1981-09-13
1988	1988-05-18	1988-09-11
1989	1989-06-06	1989-09-30
1990	1990-04-22	1990-10-05
1991	1991-06-13	1991-10-16
1992	1992-04-30	1992-10-01
1999	1999-06-25	1999-08-31
2000	2000-05-04	2000-09-18
2001	2001-05-14	2001-09-06
2002	2002-05-29	2002-09-17
2003	2003-04-13	2003-10-19
2004	2004-05-11	2004-09-12
2005	2005-05-20	2005-09-11
2006	2006-05-18	2006-09-14
2007	2007-05-13	2007-09-29
2008	2008-04-15	2008-09-01
2009	2009-04-23	2009-08-24
2010	2010-05-28	2010-08-30
2011	2011-06-06	2011-10-05
2012	2012-05-17	2012-09-11
2014	2014-05-23	2014-09-26
2016	2016-06-10	2016-09-12
2017	2017-05-08	2017-09-13
2018	2018-05-17	2018-09-13
2019	2019-05-31	2019-09-17
2020	2020-06-02	2020-09-03
2021	2021-06-04	2021-09-29
2022	2022-06-19	2022-09-20
2023	2023-06-02	2023-10-02
2024	2024-06-13	2024-10-11
2025	2025-05-11	2025-08-20
2026	2026-04-23	2026-10-11

Every Fixed Threshold

Fixed thresholds at Eureka
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	104	87	1936	42
35 C (95 F): Days	96	45	1936	11
40 C (104 F): Days	30	19	1936	5
45 C (113 F): Days	2	2	1936	2
90 F (32.2 C): Days	104	72	1936	19
100 F (37.8 C): Days	65	32	1936	1
110 F (43.3 C): Days	3	4	1936	4
0 C (32 F): Ice days (max	104	118	2019	40
0 C (32 F): Frost days (min	116	218	1917	118
-10 C (14 F): Days with min	116	119	1955	44
-20 C (-4 F): Days with min	116	67	1917	16
-30 C (-22 F): Days with min	106	30	1936	2
-40 C (-40 F): Days with min	6	4	1917	1
20 C (68 F): Tropical nights (min	102	17	2002	4
25 C (77 F): Days with min	8	3	1934	2
10 mm (0.39 in): Days with 10 mm or more rain	117	22	1957	14
25 mm (0.98 in): Days with 25 mm or more rain	112	9	1921	4
50 mm (1.97 in): Days with 50 mm or more rain	45	2	1927	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	82	9	2019	1
25 cm (9.8 in): Days with 25 cm or more snowfall	17	2	1950	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1909.

Download the Data

Data for Eureka 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).

Eureka Threshold Days by Year (USC00392797)

Key Facts for Eureka Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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