Healdsburg Threshold Days by Year (USC00043875)

15 fixed thresholds counted per year at Healdsburg (USC00043875): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Healdsburg Thresholds

Healdsburg: nights with a minimum temperature at or below 0 C (32 F) in 108 years, most in 1929 with 65.
Healdsburg: days with a maximum temperature at or above 30 C (86 F) in 104 years, most in 1984 with 119.
Healdsburg: days with a maximum temperature at or above 35 C (95 F) in 104 years, most in 1984 with 53.
Healdsburg: days with a maximum temperature at or above 90 F (32.2 C) in 104 years, most in 1984 with 97.
15 fixed thresholds have at least one qualifying day at Healdsburg.

Days at or above 30 C (86 F)

104 years with a qualifying day

Days per year at Healdsburg with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 119 in 1984.

Days at or above 30 C (86 F) per year at Healdsburg
Year	Days	Decade average
1900	69	79.6
1901	80	79.6
1902	63	79.6
1903	96	79.6
1905	91	79.6
1907	71	79.6
1909	87	79.6
1910	77	76
1911	60	76
1912	71	76
1913	114	76
1914	49	76
1916	90	76
1917	81	76
1918	66	76
1920	73	83.9
1921	71	83.9
1922	91	83.9
1923	72	83.9
1924	73	83.9
1925	53	83.9
1926	113	83.9
1927	82	83.9
1928	117	83.9
1929	94	83.9
1930	75	86
1931	93	86
1932	93	86
1933	66	86
1934	79	86
1935	74	86
1936	99	86
1937	101	86
1938	79	86
1939	101	86
1940	78	76.4
1941	87	76.4
1942	81	76.4
1943	80	76.4
1944	69	76.4
1945	79	76.4
1946	76	76.4
1947	84	76.4
1948	58	76.4
1949	72	76.4
1950	75	70.6
1951	49	70.6
1952	68	70.6
1953	62	70.6
1954	61	70.6
1955	74	70.6
1956	58	70.6
1957	73	70.6
1958	82	70.6
1959	104	70.6
1960	82	91.4
1961	93	91.4
1962	77	91.4
1963	79	91.4
1964	95	91.4
1965	83	91.4
1966	101	91.4
1967	112	91.4
1968	95	91.4
1969	97	91.4
1970	83	91.1
1971	97	91.1
1972	83	91.1
1973	94	91.1
1974	95	91.1
1975	71	91.1
1976	88	91.1
1977	84	91.1
1978	113	91.1
1979	103	91.1
1980	70	76.9
1981	102	76.9
1982	80	76.9
1983	82	76.9
1984	119	76.9
1985	63	76.9
1986	44	76.9
1987	63	76.9
1988	74	76.9
1989	72	76.9
1990	69	75
1991	56	75
1992	73	75
1993	76	75
1994	79	75
1995	70	75
1996	98	75
1997	89	75
1998	65	75
2001	104	94.7
2004	104	94.7
2005	76	94.7
2020	106	80.7
2021	79	80.7
2022	89	80.7
2023	63	80.7
2024	91	80.7
2025	64	80.7
2026	73	80.7

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

First to last qualifying date each year at Healdsburg
Year	First date	Last date
1900	1900-05-19	1900-10-26
1901	1901-05-08	1901-11-03
1902	1902-04-13	1902-10-09
1903	1903-05-08	1903-10-29
1905	1905-03-06	1905-11-14
1907	1907-04-17	1907-10-14
1909	1909-04-25	1909-10-10
1910	1910-04-15	1910-10-25
1911	1911-03-15	1911-11-02
1912	1912-04-14	1912-10-17
1913	1913-04-22	1913-10-27
1914	1914-02-13	1914-10-15
1916	1916-03-13	1916-09-29
1917	1917-05-07	1917-10-28
1918	1918-04-17	1918-10-30
1920	1920-04-25	1920-10-23
1921	1921-04-21	1921-10-20
1922	1922-05-01	1922-10-22
1923	1923-02-27	1923-10-20
1924	1924-04-05	1924-10-04
1925	1925-05-02	1925-10-26
1926	1926-02-24	1926-11-07
1927	1927-04-23	1927-10-23
1928	1928-04-08	1928-10-21
1929	1929-03-03	1929-11-07
1930	1930-02-16	1930-11-10
1931	1931-04-09	1931-10-19
1932	1932-05-10	1932-11-17
1933	1933-04-13	1933-10-23
1934	1934-04-16	1934-11-06
1935	1935-05-04	1935-10-19
1936	1936-03-03	1936-10-28
1937	1937-05-02	1937-10-25
1938	1938-04-19	1938-10-12
1939	1939-04-05	1939-10-30
1940	1940-04-12	1940-10-19
1941	1941-05-09	1941-10-17
1942	1942-05-18	1942-10-21
1943	1943-05-02	1943-10-15
1944	1944-03-18	1944-10-26
1945	1945-03-30	1945-11-03
1946	1946-04-22	1946-10-25
1947	1947-04-11	1947-10-12
1948	1948-06-19	1948-10-26
1949	1949-04-11	1949-11-04
1950	1950-04-18	1950-11-03
1951	1951-05-15	1951-10-14
1952	1952-03-25	1952-10-05
1953	1953-05-04	1953-10-08
1954	1954-04-16	1954-10-20
1955	1955-03-26	1955-11-10
1956	1956-05-15	1956-10-01
1957	1957-04-27	1957-09-22
1958	1958-04-20	1958-10-29
1959	1959-04-06	1959-10-31
1960	1960-04-04	1960-11-01
1961	1961-04-02	1961-10-17
1962	1962-04-06	1962-10-01
1963	1963-05-16	1963-10-07
1964	1964-04-13	1964-10-22
1965	1965-04-24	1965-10-30
1966	1966-03-31	1966-11-02
1967	1967-05-07	1967-11-02
1968	1968-03-29	1968-10-27
1969	1969-05-05	1969-11-01
1970	1970-03-25	1970-10-10
1971	1971-04-03	1971-10-13
1972	1972-03-15	1972-10-24
1973	1973-04-04	1973-10-30
1974	1974-04-29	1974-10-21
1975	1975-05-12	1975-10-20
1976	1976-04-30	1976-11-04
1977	1977-04-12	1977-10-14
1978	1978-04-09	1978-11-08
1979	1979-05-11	1979-10-10
1980	1980-04-11	1980-11-04
1981	1981-04-22	1981-10-23
1982	1982-04-19	1982-10-13
1983	1983-05-17	1983-10-26
1984	1984-03-19	1984-10-24
1985	1985-04-01	1985-10-15
1986	1986-03-28	1986-11-02
1987	1987-04-15	1987-10-18
1988	1988-03-25	1988-10-20
1989	1989-04-05	1989-10-18
1990	1990-04-12	1990-10-24
1991	1991-04-29	1991-10-20
1992	1992-04-19	1992-10-11
1993	1993-04-28	1993-10-26
1994	1994-05-23	1994-09-16
1995	1995-04-23	1995-10-14
1996	1996-03-17	1996-10-08
1997	1997-04-15	1997-09-29
1998	1998-04-22	1998-10-20
2001	2001-04-24	2001-10-15
2004	2004-03-15	2004-10-15
2005	2005-05-23	2005-10-18
2020	2020-03-03	2020-11-05
2021	2021-04-17	2021-10-16
2022	2022-02-10	2022-10-20
2023	2023-04-25	2023-10-19
2024	2024-05-09	2024-10-19
2025	2025-03-24	2025-10-07
2026	2026-03-07	2026-10-04

Every Fixed Threshold

Fixed thresholds at Healdsburg
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	104	119	1984	73
35 C (95 F): Days	104	53	1984	12
40 C (104 F): Days	84	13	1984	1
45 C (113 F): Days	8	2	1905	2
90 F (32.2 C): Days	104	97	1984	47
100 F (37.8 C): Days	104	24	1984	2
110 F (43.3 C): Days	21	5	1905	2
0 C (32 F): Frost days (min	108	65	1929	4
-10 C (14 F): Days with min	1	1	1990	1
20 C (68 F): Tropical nights (min	33	6	1981	2
10 mm (0.39 in): Days with 10 mm or more rain	95	63	1983	14
25 mm (0.98 in): Days with 25 mm or more rain	95	37	1983	7
50 mm (1.97 in): Days with 50 mm or more rain	91	14	1940	2
100 mm (3.94 in): Days with 100 mm or more rain	40	3	1995	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1980	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

Data for Healdsburg 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Healdsburg Threshold Days by Year (USC00043875)

Key Facts for Healdsburg Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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