Perth Regional Office Threshold Days by Year

12 fixed thresholds counted per year at Perth Regional Office (ASN00009034): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Perth Regional Office Thresholds

Perth Regional Office: days with 10 mm (0.39 in) or more of precipitation in 112 years, most in 1917 with 43.
Perth Regional Office: days with 25 mm (0.98 in) or more of precipitation in 112 years, most in 1939 with 16.
Perth Regional Office: days with a maximum temperature at or above 30 C (86 F) in 95 years, most in 1978 with 92.
Perth Regional Office: days with a maximum temperature at or above 35 C (95 F) in 95 years, most in 1978 with 45.
12 fixed thresholds have at least one qualifying day at Perth Regional Office.

Days at or above 30 C (86 F)

95 years with a qualifying day

Days per year at Perth Regional Office with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 92 in 1978.

Days at or above 30 C (86 F) per year at Perth Regional Office
Year	Days	Decade average
1897	44	49
1898	49	49
1899	54	49
1900	42	48.3
1901	48	48.3
1902	35	48.3
1903	45	48.3
1904	56	48.3
1905	43	48.3
1906	64	48.3
1907	50	48.3
1908	44	48.3
1909	56	48.3
1910	62	47
1911	39	47
1912	49	47
1913	46	47
1914	46	47
1915	60	47
1916	39	47
1917	28	47
1918	59	47
1919	42	47
1920	61	48.9
1921	69	48.9
1922	35	48.9
1923	51	48.9
1924	54	48.9
1925	37	48.9
1926	44	48.9
1927	46	48.9
1928	51	48.9
1929	41	48.9
1930	57	55.4
1931	65	55.4
1932	53	55.4
1933	66	55.4
1934	53	55.4
1935	46	55.4
1936	59	55.4
1937	57	55.4
1938	45	55.4
1939	53	55.4
1940	55	51.7
1941	48	51.7
1942	49	51.7
1943	46	51.7
1944	58	51.7
1945	61	51.7
1946	36	51.7
1947	41	51.7
1948	57	51.7
1949	66	51.7
1950	59	55.4
1951	39	55.4
1952	51	55.4
1953	49	55.4
1954	50	55.4
1955	61	55.4
1956	54	55.4
1957	62	55.4
1958	73	55.4
1959	56	55.4
1960	48	56.3
1961	68	56.3
1962	66	56.3
1963	65	56.3
1964	51	56.3
1965	58	56.3
1966	46	56.3
1967	60	56.3
1968	38	56.3
1969	63	56.3
1970	63	66.1
1971	44	66.1
1972	76	66.1
1973	60	66.1
1974	71	66.1
1975	53	66.1
1976	66	66.1
1977	71	66.1
1978	92	66.1
1979	65	66.1
1980	63	61.5
1981	63	61.5
1982	57	61.5
1983	61	61.5
1984	49	61.5
1985	64	61.5
1986	49	61.5
1987	63	61.5
1988	79	61.5
1989	67	61.5
1990	47	58
1991	69	58

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

First to last qualifying date each year at Perth Regional Office
Year	First date	Last date
1897	1897-01-01	1897-12-27
1898	1898-01-02	1898-12-27
1899	1899-01-01	1899-12-29
1900	1900-01-05	1900-12-23
1901	1901-01-01	1901-12-24
1902	1902-01-04	1902-12-19
1903	1903-01-06	1903-12-30
1904	1904-01-03	1904-12-20
1905	1905-01-19	1905-12-31
1906	1906-01-07	1906-12-31
1907	1907-01-09	1907-12-30
1908	1908-01-09	1908-12-31
1909	1909-01-09	1909-12-31
1910	1910-01-09	1910-12-31
1911	1911-01-01	1911-12-31
1912	1912-01-01	1912-12-26
1913	1913-01-07	1913-12-27
1914	1914-01-02	1914-12-31
1915	1915-01-01	1915-12-31
1916	1916-01-01	1916-12-30
1917	1917-01-13	1917-12-31
1918	1918-01-04	1918-12-31
1919	1919-01-07	1919-12-31
1920	1920-01-07	1920-12-19
1921	1921-01-03	1921-12-31
1922	1922-01-07	1922-12-20
1923	1923-01-11	1923-12-22
1924	1924-01-07	1924-12-31
1925	1925-01-02	1925-12-29
1926	1926-01-04	1926-12-31
1927	1927-01-01	1927-12-28
1928	1928-01-01	1928-12-30
1929	1929-01-01	1929-12-30
1930	1930-01-01	1930-12-26
1931	1931-01-02	1931-12-30
1932	1932-01-02	1932-12-30
1933	1933-01-04	1933-12-31
1934	1934-01-05	1934-12-28
1935	1935-01-12	1935-12-30
1936	1936-01-04	1936-12-30
1937	1937-01-02	1937-12-27
1938	1938-01-04	1938-12-29
1939	1939-01-06	1939-12-31
1940	1940-01-06	1940-12-22
1941	1941-01-06	1941-12-30
1942	1942-01-01	1942-12-19
1943	1943-01-03	1943-12-28
1944	1944-01-02	1944-12-31
1945	1945-01-01	1945-12-31
1946	1946-01-01	1946-12-25
1947	1947-01-02	1947-12-25
1948	1948-01-02	1948-12-30
1949	1949-01-03	1949-12-31
1950	1950-01-01	1950-12-31
1951	1951-01-07	1951-12-31
1952	1952-01-01	1952-12-31
1953	1953-01-01	1953-12-31
1954	1954-01-01	1954-12-28
1955	1955-01-03	1955-12-31
1956	1956-01-01	1956-12-26
1957	1957-01-06	1957-12-31
1958	1958-01-01	1958-12-31
1959	1959-01-01	1959-12-26
1960	1960-01-04	1960-12-25
1961	1961-01-01	1961-12-31
1962	1962-01-01	1962-12-28
1963	1963-01-07	1963-12-31
1964	1964-01-03	1964-12-31
1965	1965-01-01	1965-12-31
1966	1966-01-05	1966-12-20
1967	1967-01-01	1967-12-31
1968	1968-01-03	1968-12-31
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-30
1971	1971-01-16	1971-12-31
1972	1972-01-01	1972-12-30
1973	1973-01-04	1973-12-31
1974	1974-01-01	1974-12-30
1975	1975-01-10	1975-12-31
1976	1976-01-01	1976-12-27
1977	1977-01-01	1977-12-27
1978	1978-01-03	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-17
1981	1981-01-02	1981-12-27
1982	1982-01-02	1982-12-27
1983	1983-01-02	1983-12-29
1984	1984-01-07	1984-12-25
1985	1985-01-03	1985-12-31
1986	1986-01-01	1986-12-31
1987	1987-01-03	1987-12-28
1988	1988-01-02	1988-12-31
1989	1989-01-03	1989-12-26
1990	1990-01-04	1990-12-13
1991	1991-01-05	1991-12-30

Every Fixed Threshold

Fixed thresholds at Perth Regional Office
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	95	92	1978	69
35 C (95 F): Days	95	45	1978	24
40 C (104 F): Days	69	6	1961	6
45 C (113 F): Days	1	2	1991	2
90 F (32.2 C): Days	95	65	1978	45
100 F (37.8 C): Days	94	18	1972	14
110 F (43.3 C): Days	10	2	1933	2
20 C (68 F): Tropical nights (min	95	69	1978	40
25 C (77 F): Days with min	59	7	1975	6
10 mm (0.39 in): Days with 10 mm or more rain	112	43	1917	34
25 mm (0.98 in): Days with 25 mm or more rain	112	16	1939	6
50 mm (1.97 in): Days with 50 mm or more rain	53	4	1945	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

Data for Perth Regional Office 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).

Perth Regional Office Threshold Days by Year

Key Facts for Perth Regional Office Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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