Hat Creek Threshold Days by Year (USC00043824)

18 fixed thresholds counted per year at Hat Creek (USC00043824): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hat Creek Thresholds

Hat Creek: days with 10 mm (0.39 in) or more of precipitation in 90 years, most in 1998 with 28.
Hat Creek: nights with a minimum temperature at or below 0 C (32 F) in 83 years, most in 1930 with 201.
Hat Creek: days with a maximum temperature at or above 30 C (86 F) in 82 years, most in 1945 with 119.
Hat Creek: days with a maximum temperature at or above 35 C (95 F) in 82 years, most in 2021 with 58.
18 fixed thresholds have at least one qualifying day at Hat Creek.

Days at or above 30 C (86 F)

82 years with a qualifying day

Days per year at Hat Creek with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 119 in 1945.

Days at or above 30 C (86 F) per year at Hat Creek
Year	Days	Decade average
1921	114	104.4
1922	89	104.4
1927	98	104.4
1928	107	104.4
1929	114	104.4
1930	94	107.6
1931	100	107.6
1932	117	107.6
1933	104	107.6
1934	116	107.6
1935	113	107.6
1936	114	107.6
1937	97	107.6
1938	107	107.6
1939	114	107.6
1940	107	97.3
1941	70	97.3
1942	97	97.3
1943	105	97.3
1944	104	97.3
1945	119	97.3
1946	96	97.3
1948	77	97.3
1949	101	97.3
1950	94	84.5
1951	91	84.5
1952	87	84.5
1953	66	84.5
1962	74	72.4
1963	66	72.4
1964	63	72.4
1965	42	72.4
1966	77	72.4
1967	101	72.4
1968	71	72.4
1969	85	72.4
1970	101	82
1971	69	82
1972	87	82
1973	96	82
1974	96	82
1975	81	82
1976	67	82
1977	78	82
1978	67	82
1979	78	82
1980	72	83
1981	90	83
1983	58	83
1984	89	83
1985	82	83
1986	80	83
1987	103	83
1988	90	83
1990	69	78.2
1991	97	78.2
1992	96	78.2
1993	68	78.2
1998	63	78.2
1999	76	78.2
2000	79	86.7
2001	93	86.7
2002	88	86.7
2003	95	86.7
2004	90	86.7
2005	68	86.7
2006	89	86.7
2007	77	86.7
2008	102	86.7
2009	86	86.7
2011	75	88.3
2014	103	88.3
2015	91	88.3
2016	90	88.3
2017	97	88.3
2018	82	88.3
2019	80	88.3
2021	105	84
2022	100	84
2023	88	84
2024	105	84
2025	22	84

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

First to last qualifying date each year at Hat Creek
Year	First date	Last date
1921	1921-05-12	1921-10-19
1922	1922-04-25	1922-10-24
1927	1927-04-23	1927-10-22
1928	1928-05-05	1928-10-09
1929	1929-05-11	1929-10-24
1930	1930-06-05	1930-09-21
1931	1931-04-21	1931-10-02
1932	1932-05-08	1932-10-11
1933	1933-05-28	1933-10-13
1934	1934-04-10	1934-10-11
1935	1935-05-20	1935-10-09
1936	1936-04-11	1936-11-13
1937	1937-05-02	1937-10-21
1938	1938-05-12	1938-09-22
1939	1939-04-18	1939-10-22
1940	1940-05-08	1940-10-14
1941	1941-05-10	1941-09-30
1942	1942-05-21	1942-10-23
1943	1943-04-14	1943-10-14
1944	1944-05-05	1944-10-26
1945	1945-04-19	1945-10-15
1946	1946-04-23	1946-09-30
1948	1948-05-15	1948-10-08
1949	1949-04-10	1949-10-16
1950	1950-04-16	1950-10-13
1951	1951-05-26	1951-09-25
1952	1952-05-24	1952-10-13
1953	1953-06-18	1953-10-09
1962	1962-06-09	1962-10-02
1963	1963-05-18	1963-10-04
1964	1964-06-23	1964-10-08
1965	1965-05-29	1965-10-09
1966	1966-05-03	1966-10-01
1967	1967-05-17	1967-09-29
1968	1968-06-01	1968-09-28
1969	1969-05-08	1969-09-28
1970	1970-05-04	1970-10-05
1971	1971-06-16	1971-10-10
1972	1972-05-13	1972-10-04
1973	1973-04-27	1973-09-30
1974	1974-05-08	1974-10-19
1975	1975-05-14	1975-10-02
1976	1976-05-13	1976-10-09
1977	1977-06-01	1977-09-12
1978	1978-05-29	1978-10-15
1979	1979-05-14	1979-10-10
1980	1980-05-20	1980-10-10
1981	1981-04-30	1981-09-19
1983	1983-05-21	1983-09-19
1984	1984-05-28	1984-09-29
1985	1985-04-14	1985-10-06
1986	1986-05-18	1986-09-08
1987	1987-04-27	1987-10-11
1988	1988-06-14	1988-10-23
1990	1990-05-05	1990-10-01
1991	1991-06-03	1991-10-16
1992	1992-05-03	1992-10-13
1993	1993-05-24	1993-10-04
1998	1998-07-05	1998-09-17
1999	1999-05-24	1999-09-26
2000	2000-05-21	2000-10-08
2001	2001-05-08	2001-10-05
2002	2002-05-30	2002-09-27
2003	2003-05-22	2003-10-27
2004	2004-04-27	2004-10-15
2005	2005-05-26	2005-10-01
2006	2006-05-15	2006-09-30
2007	2007-05-15	2007-09-22
2008	2008-05-16	2008-10-03
2009	2009-04-21	2009-09-29
2011	2011-06-15	2011-09-30
2014	2014-05-14	2014-10-08
2015	2015-05-29	2015-10-16
2016	2016-04-09	2016-09-30
2017	2017-05-04	2017-09-14
2018	2018-05-23	2018-09-29
2019	2019-04-26	2019-09-27
2021	2021-05-01	2021-10-04
2022	2022-05-26	2022-10-16
2023	2023-04-28	2023-10-20
2024	2024-05-15	2024-10-09
2025	2025-05-10	2025-06-30

Every Fixed Threshold

Fixed thresholds at Hat Creek
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	82	119	1945	22
35 C (95 F): Days	82	58	2021	3
40 C (104 F): Days	48	16	1931	7
45 C (113 F): Days	1	1	1928	1
90 F (32.2 C): Days	82	93	1936	12
100 F (37.8 C): Days	78	33	1933	1
110 F (43.3 C): Days	4	2	1928	1
0 C (32 F): Ice days (max	37	6	1937	1
0 C (32 F): Frost days (min	83	201	1930	98
-10 C (14 F): Days with min	82	41	1949	13
-20 C (-4 F): Days with min	15	7	1937	1
20 C (68 F): Tropical nights (min	4	3	1978	1
10 mm (0.39 in): Days with 10 mm or more rain	90	28	1998	12
25 mm (0.98 in): Days with 25 mm or more rain	77	7	2017	4
50 mm (1.97 in): Days with 50 mm or more rain	13	2	1943	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	2023	1
10 cm (3.9 in): Days with 10 cm or more snowfall	50	7	1952	2
25 cm (9.8 in): Days with 25 cm or more snowfall	9	3	2008	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1921.

Download the Data

Data for Hat Creek 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).

Hat Creek Threshold Days by Year (USC00043824)

Key Facts for Hat Creek Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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