Napa State Hospital Threshold Days by Year (USC00046074)

16 fixed thresholds counted per year at Napa State Hospital (USC00046074): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Napa State Hospital Thresholds

Napa State Hospital: days with a maximum temperature at or above 30 C (86 F) in 123 years, most in 2020 with 80.
Napa State Hospital: days with a maximum temperature at or above 90 F (32.2 C) in 123 years, most in 2020 with 53.
Napa State Hospital: nights with a minimum temperature at or below 0 C (32 F) in 122 years, most in 1949 with 64.
Napa State Hospital: days with a maximum temperature at or above 35 C (95 F) in 120 years, most in 2024 with 35.
16 fixed thresholds have at least one qualifying day at Napa State Hospital.

Days at or above 30 C (86 F)

123 years with a qualifying day

Days per year at Napa State Hospital with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 2020.

Days at or above 30 C (86 F) per year at Napa State Hospital
Year	Days	Decade average
1893	10	28
1894	27	28
1895	28	28
1896	47	28
1902	50	40.8
1903	48	40.8
1904	49	40.8
1905	36	40.8
1906	51	40.8
1907	18	40.8
1908	48	40.8
1909	26	40.8
1910	38	34.3
1911	15	34.3
1912	36	34.3
1913	47	34.3
1914	20	34.3
1917	51	34.3
1918	37	34.3
1919	30	34.3
1920	37	28.5
1921	49	28.5
1922	58	28.5
1923	13	28.5
1924	18	28.5
1925	16	28.5
1926	16	28.5
1927	15	28.5
1928	14	28.5
1929	49	28.5
1930	25	42.2
1931	61	42.2
1932	79	42.2
1934	26	42.2
1935	27	42.2
1936	35	42.2
1937	32	42.2
1938	38	42.2
1939	57	42.2
1940	34	44.6
1941	38	44.6
1942	46	44.6
1943	44	44.6
1944	50	44.6
1945	58	44.6
1947	58	44.6
1948	33	44.6
1949	40	44.6
1950	49	39.2
1951	31	39.2
1952	42	39.2
1953	36	39.2
1954	35	39.2
1955	38	39.2
1956	31	39.2
1958	46	39.2
1959	45	39.2
1960	45	46.7
1961	63	46.7
1962	32	46.7
1963	35	46.7
1964	44	46.7
1965	41	46.7
1966	59	46.7
1967	53	46.7
1968	46	46.7
1969	49	46.7
1970	58	48.5
1971	47	48.5
1972	43	48.5
1973	47	48.5
1974	50	48.5
1975	41	48.5
1976	51	48.5
1977	40	48.5
1978	60	48.5
1979	48	48.5
1980	34	43.4
1981	51	43.4
1982	31	43.4
1983	50	43.4
1984	67	43.4
1985	45	43.4
1986	24	43.4
1987	35	43.4
1988	55	43.4
1989	42	43.4
1990	33	43.6
1991	43	43.6
1992	45	43.6
1993	45	43.6
1994	27	43.6
1995	42	43.6
1996	61	43.6
1997	50	43.6
1998	48	43.6
1999	42	43.6
2000	49	55.5
2001	52	55.5
2002	48	55.5
2003	63	55.5
2004	71	55.5
2005	46	55.5
2006	49	55.5
2007	52	55.5
2008	66	55.5
2009	59	55.5
2010	36	52.9
2011	45	52.9
2012	52	52.9
2013	55	52.9
2014	56	52.9
2015	63	52.9
2016	54	52.9
2017	58	52.9
2018	46	52.9
2019	64	52.9
2020	80	58
2021	50	58
2022	55	58
2024	71	58
2025	32	58
2026	60	58

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

First to last qualifying date each year at Napa State Hospital
Year	First date	Last date
1893	1893-06-01	1893-08-07
1894	1894-06-30	1894-10-05
1895	1895-05-11	1895-11-16
1896	1896-05-24	1896-10-22
1902	1902-06-16	1902-10-08
1903	1903-05-08	1903-10-19
1904	1904-04-09	1904-10-04
1905	1905-05-15	1905-10-11
1906	1906-04-19	1906-10-31
1907	1907-04-19	1907-10-14
1908	1908-04-10	1908-10-25
1909	1909-04-29	1909-10-10
1910	1910-04-20	1910-10-25
1911	1911-05-20	1911-10-19
1912	1912-05-28	1912-10-17
1913	1913-04-23	1913-10-25
1914	1914-03-17	1914-10-28
1917	1917-06-12	1917-10-26
1918	1918-06-01	1918-10-13
1919	1919-05-27	1919-10-12
1920	1920-04-25	1920-09-29
1921	1921-04-21	1921-11-07
1922	1922-05-02	1922-10-22
1923	1923-07-27	1923-11-18
1924	1924-04-06	1924-10-02
1925	1925-05-02	1925-10-25
1926	1926-03-24	1926-09-24
1927	1927-03-22	1927-10-19
1928	1928-06-02	1928-10-08
1929	1929-05-11	1929-11-04
1930	1930-03-27	1930-11-02
1931	1931-04-09	1931-11-07
1932	1932-05-24	1932-11-18
1934	1934-05-10	1934-10-10
1935	1935-05-04	1935-09-17
1936	1936-05-08	1936-10-09
1937	1937-05-02	1937-10-22
1938	1938-05-23	1938-10-25
1939	1939-04-06	1939-10-30
1940	1940-04-12	1940-10-19
1941	1941-05-09	1941-10-16
1942	1942-05-19	1942-10-22
1943	1943-05-07	1943-10-14
1944	1944-05-01	1944-10-26
1945	1945-04-23	1945-11-03
1947	1947-04-12	1947-10-14
1948	1948-06-21	1948-10-17
1949	1949-05-05	1949-11-04
1950	1950-04-18	1950-10-14
1951	1951-05-15	1951-10-14
1952	1952-03-26	1952-10-03
1953	1953-05-04	1953-10-07
1954	1954-04-16	1954-10-15
1955	1955-05-10	1955-11-08
1956	1956-05-15	1956-09-30
1958	1958-05-15	1958-10-17
1959	1959-04-23	1959-10-24
1960	1960-04-04	1960-10-16
1961	1961-04-03	1961-10-17
1962	1962-04-11	1962-10-01
1963	1963-05-16	1963-10-01
1964	1964-04-14	1964-10-22
1965	1965-04-25	1965-10-30
1966	1966-03-31	1966-11-02
1967	1967-05-15	1967-10-30
1968	1968-04-09	1968-10-27
1969	1969-05-05	1969-10-31
1970	1970-05-01	1970-10-10
1971	1971-06-14	1971-10-13
1972	1972-03-16	1972-10-07
1973	1973-05-10	1973-10-17
1974	1974-04-29	1974-10-19
1975	1975-05-12	1975-10-05
1976	1976-05-11	1976-11-03
1977	1977-04-17	1977-10-14
1978	1978-05-08	1978-10-14
1979	1979-06-01	1979-10-03
1980	1980-05-19	1980-11-04
1981	1981-04-27	1981-10-01
1982	1982-04-21	1982-10-13
1983	1983-05-17	1983-10-27
1984	1984-04-14	1984-10-24
1985	1985-04-04	1985-11-01
1986	1986-05-17	1986-10-07
1987	1987-04-15	1987-10-06
1988	1988-03-26	1988-10-18
1989	1989-04-05	1989-10-10
1990	1990-04-14	1990-10-10
1991	1991-04-29	1991-10-21
1992	1992-04-28	1992-10-12
1993	1993-04-30	1993-10-27
1994	1994-05-29	1994-10-10
1995	1995-06-21	1995-10-14
1996	1996-04-29	1996-10-09
1997	1997-05-16	1997-11-02
1998	1998-04-22	1998-10-21
1999	1999-04-15	1999-10-22
2000	2000-04-01	2000-10-01
2001	2001-04-25	2001-10-15
2002	2002-05-24	2002-10-10
2003	2003-05-20	2003-10-29
2004	2004-03-10	2004-10-14
2005	2005-03-11	2005-10-17
2006	2006-05-10	2006-09-26
2007	2007-04-27	2007-10-24
2008	2008-04-12	2008-11-14
2009	2009-04-19	2009-10-26
2010	2010-06-05	2010-10-15
2011	2011-03-30	2011-10-24
2012	2012-04-20	2012-10-18
2013	2013-04-21	2013-10-06
2014	2014-04-29	2014-10-13
2015	2015-04-27	2015-10-14
2016	2016-04-07	2016-10-09
2017	2017-05-01	2017-10-28
2018	2018-05-29	2018-10-13
2019	2019-04-22	2019-10-26
2020	2020-04-25	2020-11-06
2021	2021-04-18	2021-10-05
2022	2022-03-22	2022-10-20
2024	2024-05-10	2024-10-09
2025	2025-03-25	2025-10-08
2026	2026-03-16	2026-10-09

Every Fixed Threshold

Fixed thresholds at Napa State Hospital
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	123	80	2020	60
35 C (95 F): Days	120	35	2024	7
40 C (104 F): Days	50	6	2020	5
45 C (113 F): Days	2	1	1961	1
90 F (32.2 C): Days	123	53	2020	27
100 F (37.8 C): Days	104	12	2020	2
110 F (43.3 C): Days	8	2	2020	1
0 C (32 F): Ice days (max	1	1	1903	1
0 C (32 F): Frost days (min	122	64	1949	2
-10 C (14 F): Days with min	1	1	1990	1
20 C (68 F): Tropical nights (min	38	5	2020	1
25 C (77 F): Days with min	2	1	2000	1
10 mm (0.39 in): Days with 10 mm or more rain	112	46	1983	14
25 mm (0.98 in): Days with 25 mm or more rain	111	15	1982	3
50 mm (1.97 in): Days with 50 mm or more rain	62	4	1982	1
100 mm (3.94 in): Days with 100 mm or more rain	9	2	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Napa State Hospital 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).

Napa State Hospital Threshold Days by Year (USC00046074)

Key Facts for Napa State Hospital Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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