Petaluma AP Threshold Days by Year (USC00046826)

12 fixed thresholds counted per year at Petaluma AP (USC00046826): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Petaluma AP Thresholds

Petaluma AP: nights with a minimum temperature at or below 0 C (32 F) in 106 years, most in 1917 with 62.
Petaluma AP: days with a maximum temperature at or above 30 C (86 F) in 99 years, most in 1984 with 75.
Petaluma AP: days with a maximum temperature at or above 90 F (32.2 C) in 99 years, most in 1984 with 42.
Petaluma AP: days with a maximum temperature at or above 35 C (95 F) in 98 years, most in 1984 with 23.
12 fixed thresholds have at least one qualifying day at Petaluma AP.

Days at or above 30 C (86 F)

99 years with a qualifying day

Days per year at Petaluma AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 75 in 1984.

Days at or above 30 C (86 F) per year at Petaluma AP
Year	Days	Decade average
1914	24	29
1915	31	29
1916	32	29
1917	43	29
1918	13	29
1919	31	29
1920	27	35.4
1921	37	35.4
1922	42	35.4
1923	35	35.4
1924	34	35.4
1925	29	35.4
1926	48	35.4
1928	27	35.4
1929	40	35.4
1930	14	40.8
1931	42	40.8
1932	33	40.8
1933	44	40.8
1934	43	40.8
1935	46	40.8
1936	68	40.8
1937	41	40.8
1938	28	40.8
1939	49	40.8
1940	26	31.9
1941	35	31.9
1942	32	31.9
1943	41	31.9
1944	33	31.9
1945	34	31.9
1946	25	31.9
1947	27	31.9
1948	33	31.9
1949	33	31.9
1950	40	41.6
1951	25	41.6
1952	40	41.6
1953	34	41.6
1954	40	41.6
1955	47	41.6
1956	29	41.6
1957	45	41.6
1958	59	41.6
1959	57	41.6
1960	50	43
1961	56	43
1962	37	43
1963	36	43
1964	49	43
1965	32	43
1966	43	43
1967	35	43
1968	40	43
1969	52	43
1970	48	42.8
1971	51	42.8
1972	35	42.8
1973	37	42.8
1974	45	42.8
1975	31	42.8
1976	47	42.8
1977	32	42.8
1978	53	42.8
1979	49	42.8
1980	30	46.5
1981	42	46.5
1982	44	46.5
1983	55	46.5
1984	75	46.5
1985	51	46.5
1986	33	46.5
1987	40	46.5
1988	53	46.5
1989	42	46.5
1992	20	31.3
1993	41	31.3
1994	18	31.3
1995	34	31.3
1996	38	31.3
1997	31	31.3
1998	37	31.3
2002	40	40
2011	26	37.7
2012	32	37.7
2013	28	37.7
2014	44	37.7
2015	51	37.7
2016	28	37.7
2017	49	37.7
2018	35	37.7
2019	46	37.7
2020	63	41.3
2021	35	41.3
2022	43	41.3
2023	39	41.3
2024	52	41.3
2025	25	41.3
2026	32	41.3

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

First to last qualifying date each year at Petaluma AP
Year	First date	Last date
1914	1914-03-16	1914-10-14
1915	1915-06-27	1915-10-28
1916	1916-04-30	1916-09-28
1917	1917-06-12	1917-10-26
1918	1918-06-08	1918-10-19
1919	1919-05-13	1919-10-12
1920	1920-05-18	1920-09-28
1921	1921-04-27	1921-10-19
1922	1922-05-13	1922-10-23
1923	1923-03-26	1923-10-20
1924	1924-04-05	1924-10-03
1925	1925-05-02	1925-10-26
1926	1926-04-25	1926-11-02
1928	1928-06-03	1928-10-08
1929	1929-03-03	1929-11-07
1930	1930-02-11	1930-10-06
1931	1931-04-20	1931-10-04
1932	1932-05-25	1932-11-17
1933	1933-05-27	1933-10-21
1934	1934-05-10	1934-10-10
1935	1935-05-04	1935-10-06
1936	1936-04-11	1936-10-23
1937	1937-05-02	1937-10-21
1938	1938-05-24	1938-09-17
1939	1939-04-06	1939-10-22
1940	1940-04-13	1940-10-18
1941	1941-05-09	1941-10-16
1942	1942-05-19	1942-10-22
1943	1943-05-21	1943-10-14
1944	1944-05-25	1944-10-26
1945	1945-06-11	1945-10-05
1946	1946-05-06	1946-10-13
1947	1947-04-12	1947-10-04
1948	1948-06-21	1948-10-16
1949	1949-05-06	1949-10-30
1950	1950-04-19	1950-10-13
1951	1951-05-25	1951-10-13
1952	1952-05-17	1952-10-02
1953	1953-05-04	1953-10-07
1954	1954-04-16	1954-10-21
1955	1955-05-18	1955-11-10
1956	1956-05-15	1956-09-29
1957	1957-04-28	1957-09-22
1958	1958-05-15	1958-10-16
1959	1959-04-23	1959-10-23
1960	1960-04-04	1960-10-16
1961	1961-06-13	1961-10-17
1962	1962-04-12	1962-10-01
1963	1963-05-17	1963-10-01
1964	1964-04-14	1964-10-22
1965	1965-04-26	1965-10-30
1966	1966-04-15	1966-10-31
1967	1967-05-07	1967-11-02
1968	1968-04-26	1968-10-26
1969	1969-05-05	1969-09-28
1970	1970-03-25	1970-10-09
1971	1971-06-15	1971-10-14
1972	1972-05-02	1972-10-07
1973	1973-05-11	1973-10-16
1974	1974-05-26	1974-10-18
1975	1975-05-24	1975-10-04
1976	1976-05-11	1976-10-17
1977	1977-05-30	1977-10-14
1978	1978-05-17	1978-10-23
1979	1979-05-12	1979-10-03
1980	1980-06-27	1980-10-08
1981	1981-04-22	1981-10-23
1982	1982-05-04	1982-10-13
1983	1983-05-17	1983-10-27
1984	1984-04-14	1984-10-07
1985	1985-04-04	1985-11-01
1986	1986-04-20	1986-10-07
1987	1987-04-21	1987-10-18
1988	1988-04-09	1988-10-18
1989	1989-04-05	1989-10-18
1992	1992-05-09	1992-10-10
1993	1993-05-09	1993-10-29
1994	1994-06-09	1994-10-09
1995	1995-06-23	1995-10-14
1996	1996-04-29	1996-10-09
1997	1997-05-16	1997-11-02
1998	1998-04-21	1998-10-21
2002	2002-06-04	2002-10-09
2011	2011-06-20	2011-10-14
2012	2012-04-21	2012-10-18
2013	2013-04-22	2013-09-19
2014	2014-04-30	2014-10-13
2015	2015-04-30	2015-10-15
2016	2016-05-17	2016-10-11
2017	2017-05-03	2017-10-28
2018	2018-04-23	2018-11-01
2019	2019-04-23	2019-10-26
2020	2020-05-07	2020-11-02
2021	2021-05-08	2021-10-04
2022	2022-05-18	2022-10-20
2023	2023-04-27	2023-10-19
2024	2024-05-10	2024-10-08
2025	2025-05-06	2025-10-07
2026	2026-03-17	2026-10-08

Every Fixed Threshold

Fixed thresholds at Petaluma AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	99	75	1984	32
35 C (95 F): Days	98	23	1984	7
40 C (104 F): Days	29	4	1961	3
90 F (32.2 C): Days	99	42	1984	18
100 F (37.8 C): Days	71	8	1950	8
110 F (43.3 C): Days	3	1	1960	1
0 C (32 F): Frost days (min	106	62	1917	3
20 C (68 F): Tropical nights (min	8	3	1920	2
10 mm (0.39 in): Days with 10 mm or more rain	97	44	1983	14
25 mm (0.98 in): Days with 25 mm or more rain	94	14	1940	1
50 mm (1.97 in): Days with 50 mm or more rain	58	6	1940	2
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1916	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1914.

Download the Data

Data for Petaluma AP 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).

Petaluma AP Threshold Days by Year (USC00046826)

Key Facts for Petaluma AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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