Graton Threshold Days by Year (USC00043578)

14 fixed thresholds counted per year at Graton (USC00043578): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Graton Thresholds

Graton: days with 10 mm (0.39 in) or more of precipitation in 100 years, most in 1983 with 62.
Graton: days with a maximum temperature at or above 30 C (86 F) in 99 years, most in 2020 with 92.
Graton: days with a maximum temperature at or above 35 C (95 F) in 99 years, most in 2020 with 33.
Graton: days with a maximum temperature at or above 90 F (32.2 C) in 99 years, most in 1936 with 60.
14 fixed thresholds have at least one qualifying day at Graton.

Days at or above 30 C (86 F)

99 years with a qualifying day

Days per year at Graton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 92 in 2020.

Days at or above 30 C (86 F) per year at Graton
Year	Days	Decade average
1926	59	43.8
1927	34	43.8
1928	34	43.8
1929	48	43.8
1930	46	61
1931	59	61
1932	62	61
1933	62	61
1934	60	61
1935	53	61
1936	82	61
1937	64	61
1938	48	61
1939	74	61
1940	51	43.1
1941	53	43.1
1942	53	43.1
1943	49	43.1
1944	26	43.1
1945	41	43.1
1946	38	43.1
1947	47	43.1
1948	34	43.1
1949	39	43.1
1950	43	37.5
1951	22	37.5
1952	36	37.5
1953	41	37.5
1954	27	37.5
1955	38	37.5
1956	26	37.5
1957	46	37.5
1958	38	37.5
1959	58	37.5
1960	43	46.9
1961	57	46.9
1962	35	46.9
1963	42	46.9
1964	57	46.9
1965	29	46.9
1966	46	46.9
1967	53	46.9
1968	47	46.9
1969	60	46.9
1970	59	59.4
1971	67	59.4
1972	45	59.4
1973	50	59.4
1974	58	59.4
1975	41	59.4
1976	62	59.4
1977	55	59.4
1978	84	59.4
1979	73	59.4
1980	38	57
1981	69	57
1982	49	57
1983	71	57
1984	87	57
1985	53	57
1986	30	57
1987	46	57
1988	65	57
1989	62	57
1990	65	49.4
1991	45	49.4
1992	46	49.4
1993	59	49.4
1994	40	49.4
1995	45	49.4
1996	64	49.4
1997	52	49.4
1998	40	49.4
1999	38	49.4
2000	45	61.4
2001	64	61.4
2002	56	61.4
2003	65	61.4
2004	79	61.4
2005	42	61.4
2006	54	61.4
2007	67	61.4
2008	84	61.4
2009	58	61.4
2010	43	64
2011	44	64
2012	65	64
2013	71	64
2014	65	64
2015	78	64
2016	68	64
2017	83	64
2018	48	64
2019	75	64
2020	92	69.2
2021	68	69.2
2022	75	69.2
2025	45	69.2
2026	66	69.2

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

First to last qualifying date each year at Graton
Year	First date	Last date
1926	1926-03-22	1926-11-07
1927	1927-04-23	1927-10-19
1928	1928-06-01	1928-10-18
1929	1929-03-03	1929-11-04
1930	1930-03-24	1930-11-11
1931	1931-04-15	1931-10-01
1932	1932-05-23	1932-11-17
1933	1933-04-02	1933-10-23
1934	1934-05-05	1934-10-10
1935	1935-05-04	1935-10-27
1936	1936-04-10	1936-11-18
1937	1937-05-02	1937-10-21
1938	1938-04-18	1938-10-25
1939	1939-04-04	1939-10-30
1940	1940-05-08	1940-10-18
1941	1941-05-20	1941-10-17
1942	1942-05-19	1942-10-21
1943	1943-05-21	1943-10-14
1944	1944-06-07	1944-09-26
1945	1945-06-10	1945-10-04
1946	1946-04-23	1946-10-24
1947	1947-04-12	1947-10-03
1948	1948-06-21	1948-09-28
1949	1949-05-05	1949-10-13
1950	1950-04-19	1950-10-13
1951	1951-05-15	1951-10-07
1952	1952-03-25	1952-10-02
1953	1953-06-21	1953-10-06
1954	1954-04-17	1954-09-26
1955	1955-05-11	1955-11-09
1956	1956-05-16	1956-09-29
1957	1957-04-28	1957-09-22
1958	1958-05-15	1958-10-10
1959	1959-04-28	1959-10-24
1960	1960-05-31	1960-10-16
1961	1961-06-13	1961-10-16
1962	1962-05-31	1962-09-23
1963	1963-05-17	1963-10-01
1964	1964-04-14	1964-10-22
1965	1965-04-25	1965-10-25
1966	1966-04-15	1966-10-09
1967	1967-05-14	1967-11-02
1968	1968-04-27	1968-10-26
1969	1969-05-06	1969-10-02
1970	1970-05-02	1970-10-11
1971	1971-06-06	1971-10-14
1972	1972-05-12	1972-10-07
1973	1973-04-25	1973-10-17
1974	1974-05-12	1974-10-19
1975	1975-05-26	1975-10-06
1976	1976-05-12	1976-11-05
1977	1977-04-13	1977-10-15
1978	1978-04-10	1978-10-24
1979	1979-05-13	1979-10-04
1980	1980-05-18	1980-10-23
1981	1981-04-28	1981-10-02
1982	1982-05-05	1982-10-14
1983	1983-05-18	1983-10-27
1984	1984-05-08	1984-10-25
1985	1985-04-03	1985-10-16
1986	1986-04-21	1986-10-05
1987	1987-04-16	1987-10-19
1988	1988-03-27	1988-10-21
1989	1989-04-06	1989-10-20
1990	1990-04-14	1990-10-25
1991	1991-04-30	1991-10-21
1992	1992-04-29	1992-10-12
1993	1993-05-02	1993-10-28
1994	1994-05-30	1994-10-10
1995	1995-06-23	1995-10-20
1996	1996-03-18	1996-10-12
1997	1997-05-17	1997-10-17
1998	1998-06-15	1998-10-22
1999	1999-05-12	1999-10-22
2000	2000-04-02	2000-10-01
2001	2001-05-01	2001-10-26
2002	2002-05-30	2002-10-14
2003	2003-05-20	2003-10-30
2004	2004-03-11	2004-10-15
2005	2005-03-11	2005-10-18
2006	2006-05-11	2006-10-29
2007	2007-04-28	2007-10-25
2008	2008-04-13	2008-11-15
2009	2009-04-20	2009-10-26
2010	2010-05-04	2010-11-16
2011	2011-03-31	2011-10-24
2012	2012-04-21	2012-11-06
2013	2013-04-11	2013-10-20
2014	2014-04-08	2014-10-30
2015	2015-03-27	2015-11-01
2016	2016-02-16	2016-10-21
2017	2017-04-02	2017-11-02
2018	2018-03-29	2018-11-03
2019	2019-04-22	2019-10-25
2020	2020-04-23	2020-11-02
2021	2021-04-18	2021-10-16
2022	2022-03-22	2022-10-19
2025	2025-03-25	2025-10-07
2026	2026-03-15	2026-10-06

Every Fixed Threshold

Fixed thresholds at Graton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	99	92	2020	66
35 C (95 F): Days	99	33	2020	16
40 C (104 F): Days	44	7	2020	1
45 C (113 F): Days	3	2	2020	1
90 F (32.2 C): Days	99	60	1936	42
100 F (37.8 C): Days	87	12	1973	4
110 F (43.3 C): Days	6	2	1971	2
0 C (32 F): Frost days (min	99	89	2013	12
-10 C (14 F): Days with min	1	2	1990	2
20 C (68 F): Tropical nights (min	1	1	1961	1
10 mm (0.39 in): Days with 10 mm or more rain	100	62	1983	3
25 mm (0.98 in): Days with 25 mm or more rain	99	31	1983	5
50 mm (1.97 in): Days with 50 mm or more rain	96	9	1940	1
100 mm (3.94 in): Days with 100 mm or more rain	37	4	2021	4

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1926.

Download the Data

Data for Graton 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).

Graton Threshold Days by Year (USC00043578)

Key Facts for Graton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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