Eureka Threshold Days by Year (USC00262708)

19 fixed thresholds counted per year at Eureka (USC00262708): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Eureka Thresholds

Eureka: days with a maximum temperature at or above 30 C (86 F) in 91 years, most in 1889 with 85.
Eureka: days with a maximum temperature at or above 90 F (32.2 C) in 91 years, most in 1889 with 72.
Eureka: days with a maximum temperature at or below 0 C (32 F) in 91 years, most in 2001 with 48.
Eureka: days with 10 mm (0.39 in) or more of precipitation in 89 years, most in 1941 with 21.
19 fixed thresholds have at least one qualifying day at Eureka.

Days at or above 30 C (86 F)

91 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 85 in 1889.

Days at or above 30 C (86 F) per year at Eureka
Year	Days	Decade average
1889	85	85
1903	58	45.8
1904	57	45.8
1905	34	45.8
1907	27	45.8
1908	44	45.8
1909	55	45.8
1910	56	38.9
1911	41	38.9
1912	26	38.9
1913	26	38.9
1914	44	38.9
1915	39	38.9
1916	32	38.9
1918	47	38.9
1922	31	37
1923	38	37
1924	48	37
1925	24	37
1926	27	37
1928	47	37
1929	44	37
1939	53	53
1940	62	44.3
1941	23	44.3
1942	48	44.3
1953	57	49.4
1954	33	49.4
1955	45	49.4
1956	51	49.4
1957	50	49.4
1958	47	49.4
1959	63	49.4
1965	24	40.4
1966	52	40.4
1967	44	40.4
1968	35	40.4
1969	47	40.4
1970	41	39.4
1971	48	39.4
1972	40	39.4
1973	41	39.4
1974	50	39.4
1975	27	39.4
1976	27	39.4
1977	42	39.4
1978	35	39.4
1979	43	39.4
1980	33	33.5
1981	68	33.5
1982	30	33.5
1983	18	33.5
1986	24	33.5
1987	36	33.5
1988	27	33.5
1989	32	33.5
1991	25	27.9
1992	20	27.9
1993	12	27.9
1994	48	27.9
1995	21	27.9
1996	39	27.9
1997	22	27.9
1998	32	27.9
1999	32	27.9
2000	32	38.2
2001	37	38.2
2002	40	38.2
2003	44	38.2
2004	25	38.2
2006	31	38.2
2007	50	38.2
2008	52	38.2
2009	33	38.2
2010	47	42.6
2011	39	42.6
2012	40	42.6
2013	40	42.6
2014	26	42.6
2015	37	42.6
2016	55	42.6
2017	51	42.6
2018	52	42.6
2019	39	42.6
2020	61	50.1
2021	51	50.1
2022	54	50.1
2023	27	50.1
2024	55	50.1
2025	49	50.1
2026	54	50.1

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
1889	1889-05-20	1889-10-05
1903	1903-06-22	1903-09-05
1904	1904-06-16	1904-09-08
1905	1905-06-08	1905-08-17
1907	1907-07-04	1907-09-11
1908	1908-06-25	1908-09-06
1909	1909-06-02	1909-08-28
1910	1910-05-29	1910-09-10
1911	1911-06-11	1911-09-01
1912	1912-06-02	1912-08-25
1913	1913-06-21	1913-09-20
1914	1914-06-18	1914-08-24
1915	1915-06-22	1915-09-22
1916	1916-06-08	1916-09-14
1918	1918-06-06	1918-09-20
1922	1922-06-18	1922-08-18
1923	1923-06-28	1923-09-11
1924	1924-06-16	1924-09-07
1925	1925-06-24	1925-08-06
1926	1926-06-03	1926-08-27
1928	1928-06-02	1928-09-06
1929	1929-06-21	1929-08-31
1939	1939-05-29	1939-08-27
1940	1940-06-11	1940-08-30
1941	1941-07-02	1941-08-07
1942	1942-06-23	1942-08-24
1953	1953-06-17	1953-09-13
1954	1954-05-19	1954-09-05
1955	1955-06-07	1955-09-13
1956	1956-06-09	1956-09-18
1957	1957-06-04	1957-09-07
1958	1958-06-18	1958-09-21
1959	1959-06-05	1959-09-11
1965	1965-06-22	1965-08-27
1966	1966-05-26	1966-09-05
1967	1967-06-30	1967-09-03
1968	1968-06-02	1968-09-01
1969	1969-06-04	1969-09-06
1970	1970-06-21	1970-08-25
1971	1971-06-20	1971-09-13
1972	1972-06-16	1972-08-11
1973	1973-06-08	1973-08-20
1974	1974-06-11	1974-09-09
1975	1975-07-06	1975-09-07
1976	1976-06-27	1976-09-04
1977	1977-06-02	1977-09-07
1978	1978-06-08	1978-08-30
1979	1979-06-11	1979-09-09
1980	1980-06-28	1980-08-14
1981	1981-06-19	1981-09-16
1982	1982-06-27	1982-09-03
1983	1983-05-29	1983-08-08
1986	1986-06-24	1986-09-05
1987	1987-06-04	1987-09-03
1988	1988-06-24	1988-08-29
1989	1989-06-15	1989-08-17
1991	1991-06-13	1991-08-31
1992	1992-07-06	1992-08-21
1993	1993-06-27	1993-08-24
1994	1994-06-12	1994-08-27
1995	1995-07-07	1995-09-03
1996	1996-06-05	1996-09-04
1997	1997-07-05	1997-08-31
1998	1998-06-29	1998-09-01
1999	1999-06-14	1999-08-30
2000	2000-06-05	2000-09-17
2001	2001-06-09	2001-08-28
2002	2002-05-31	2002-08-20
2003	2003-05-27	2003-08-20
2004	2004-06-04	2004-09-11
2006	2006-06-07	2006-08-29
2007	2007-06-15	2007-09-04
2008	2008-06-22	2008-09-02
2009	2009-05-19	2009-08-31
2010	2010-06-07	2010-10-01
2011	2011-06-23	2011-09-01
2012	2012-06-18	2012-08-29
2013	2013-06-10	2013-08-19
2014	2014-06-26	2014-09-03
2015	2015-06-16	2015-09-13
2016	2016-06-04	2016-09-02
2017	2017-06-08	2017-09-07
2018	2018-06-05	2018-09-11
2019	2019-07-12	2019-09-03
2020	2020-05-30	2020-10-06
2021	2021-06-04	2021-09-12
2022	2022-06-09	2022-09-09
2023	2023-07-02	2023-08-30
2024	2024-06-06	2024-09-29
2025	2025-06-01	2025-09-04
2026	2026-06-04	2026-09-13

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	91	85	1889	54
35 C (95 F): Days	52	43	1889	3
40 C (104 F): Days	3	2	1904	1
90 F (32.2 C): Days	91	72	1889	27
100 F (37.8 C): Days	3	16	1889	2
110 F (43.3 C): Days	1	1	1904	1
0 C (32 F): Ice days (max	91	48	2001	6
0 C (32 F): Frost days (min	81	218	1941	98
-10 C (14 F): Days with min	81	71	1942	9
-20 C (-4 F): Days with min	58	9	1913	2
-30 C (-22 F): Days with min	1	1	1905	1
20 C (68 F): Tropical nights (min	6	27	1905	1
25 C (77 F): Days with min	1	1	1905	1
10 mm (0.39 in): Days with 10 mm or more rain	89	21	1941	3
25 mm (0.98 in): Days with 25 mm or more rain	53	4	1916	1
50 mm (1.97 in): Days with 50 mm or more rain	2	1	1905	1
10 cm (3.9 in): Days with 10 cm or more snowfall	52	12	2009	1
25 cm (9.8 in): Days with 25 cm or more snowfall	19	2	1908	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	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 1889.

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 (USC00262708)

Key Facts for Eureka Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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