Eureka Threshold Days by Year (USC00422625)

14 fixed thresholds counted per year at Eureka (USC00422625): 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 49 years, most in 1941 with 22.
Eureka: days with 10 cm (3.9 in) or more of snowfall in 38 years, most in 1952 with 22.
Eureka: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1978 with 6.
Eureka: days with 25 cm (9.8 in) or more of snowfall in 20 years, most in 1952 with 4.
14 fixed thresholds have at least one qualifying day at Eureka.

Days at or above 30 C (86 F)

17 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 63 in 1974.

Days at or above 30 C (86 F) per year at Eureka
Year	Days	Decade average
1964	30	32
1965	15	32
1966	38	32
1967	42	32
1968	26	32
1969	41	32
1970	42	39.9
1971	47	39.9
1972	43	39.9
1973	35	39.9
1974	63	39.9
1975	15	39.9
1976	33	39.9
1977	45	39.9
1978	35	39.9
1979	41	39.9
1982	26	26

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
1964	1964-05-20	1964-08-11
1965	1965-07-03	1965-08-13
1966	1966-06-18	1966-09-09
1967	1967-07-01	1967-09-03
1968	1968-06-17	1968-09-10
1969	1969-06-05	1969-08-28
1970	1970-06-21	1970-08-29
1971	1971-06-19	1971-09-13
1972	1972-05-31	1972-08-20
1973	1973-06-08	1973-08-22
1974	1974-06-12	1974-09-11
1975	1975-07-02	1975-08-11
1976	1976-06-28	1976-09-05
1977	1977-06-04	1977-09-08
1978	1978-07-02	1978-09-04
1979	1979-06-16	1979-09-08
1982	1982-06-27	1982-09-03

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	17	63	1974	26
35 C (95 F): Days	4	2	1972	1
90 F (32.2 C): Days	17	24	1970	3
0 C (32 F): Ice days (max	17	44	1979	36
0 C (32 F): Frost days (min	17	187	1970	164
-10 C (14 F): Days with min	17	71	1964	36
-20 C (-4 F): Days with min	15	8	1972	3
20 C (68 F): Tropical nights (min	2	3	1982	3
10 mm (0.39 in): Days with 10 mm or more rain	49	22	1941	17
25 mm (0.98 in): Days with 25 mm or more rain	31	6	1978	2
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1946	1
10 cm (3.9 in): Days with 10 cm or more snowfall	38	22	1952	12
25 cm (9.8 in): Days with 25 cm or more snowfall	20	4	1952	3
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1951	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Eureka Threshold Days by Year (USC00422625)

Key Facts for Eureka Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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