Isis Downs Threshold Days by Year

4 fixed thresholds counted per year at Isis Downs (ASN00036025): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Isis Downs Thresholds

Isis Downs: days with 10 mm (0.39 in) or more of precipitation in 84 years, most in 1950 with 36.
Isis Downs: days with 25 mm (0.98 in) or more of precipitation in 84 years, most in 1950 with 19.
Isis Downs: days with 50 mm (1.97 in) or more of precipitation in 57 years, most in 1950 with 7.
Isis Downs: days with 100 mm (3.94 in) or more of precipitation in 15 years, most in 1990 with 3.
4 fixed thresholds have at least one qualifying day at Isis Downs.

Days with 10 mm (0.39 in) or more of precipitation

84 years with a qualifying day

Days per year at Isis Downs with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 36 in 1950.

Days with 10 mm (0.39 in) or more of precipitation per year at Isis Downs
Year	Days	Decade average
1900	4	4
1915	10	15.8
1916	22	15.8
1917	18	15.8
1918	16	15.8
1919	13	15.8
1920	18	12.4
1921	17	12.4
1922	11	12.4
1923	11	12.4
1924	24	12.4
1925	9	12.4
1926	8	12.4
1927	8	12.4
1928	10	12.4
1929	8	12.4
1930	12	11.4
1931	14	11.4
1932	11	11.4
1933	13	11.4
1934	9	11.4
1935	4	11.4
1936	16	11.4
1937	5	11.4
1938	13	11.4
1939	17	11.4
1940	11	11.6
1941	21	11.6
1942	8	11.6
1943	5	11.6
1944	10	11.6
1945	10	11.6
1946	8	11.6
1947	17	11.6
1948	5	11.6
1949	21	11.6
1950	36	16.4
1951	8	16.4
1952	7	16.4
1953	11	16.4
1954	20	16.4
1955	25	16.4
1956	22	16.4
1957	12	16.4
1958	11	16.4
1959	12	16.4
1960	15	12
1961	11	12
1962	21	12
1963	20	12
1964	13	12
1965	6	12
1966	12	12
1967	9	12
1968	7	12
1969	6	12
1970	8	15.4
1971	16	15.4
1972	10	15.4
1973	20	15.4
1974	19	15.4
1975	14	15.4
1976	24	15.4
1977	16	15.4
1978	12	15.4
1985	8	11.6
1986	7	11.6
1987	14	11.6
1988	10	11.6
1989	19	11.6
1990	20	14.5
1991	12	14.5
1992	13	14.5
1993	7	14.5
1994	9	14.5
1995	10	14.5
1996	14	14.5
1997	13	14.5
1998	24	14.5
1999	23	14.5
2000	18	14.3
2001	19	14.3
2002	6	14.3
2023	6	6

For each year, a bar from the first to the last day at Isis Downs meeting 10 mm (0.39 in).

First to last qualifying date each year at Isis Downs
Year	First date	Last date
1900	1900-02-23	1900-11-04
1915	1915-01-11	1915-12-28
1916	1916-01-15	1916-12-31
1917	1917-01-01	1917-12-11
1918	1918-01-06	1918-12-07
1919	1919-01-30	1919-12-20
1920	1920-01-20	1920-11-26
1921	1921-01-04	1921-12-26
1922	1922-01-16	1922-12-26
1923	1923-01-08	1923-12-24
1924	1924-01-06	1924-12-16
1925	1925-01-02	1925-11-13
1926	1926-01-27	1926-12-26
1927	1927-01-21	1927-12-23
1928	1928-02-18	1928-12-27
1929	1929-01-01	1929-12-03
1930	1930-01-25	1930-10-11
1931	1931-03-12	1931-12-06
1932	1932-01-11	1932-11-25
1933	1933-01-29	1933-12-25
1934	1934-01-28	1934-10-16
1935	1935-06-30	1935-12-30
1936	1936-01-06	1936-12-04
1937	1937-02-09	1937-06-12
1938	1938-01-10	1938-11-17
1939	1939-01-26	1939-12-21
1940	1940-02-02	1940-12-30
1941	1941-01-03	1941-12-02
1942	1942-05-26	1942-12-08
1943	1943-03-08	1943-12-18
1944	1944-01-25	1944-12-19
1945	1945-01-17	1945-12-08
1946	1946-01-11	1946-12-20
1947	1947-01-30	1947-12-15
1948	1948-01-02	1948-12-31
1949	1949-01-09	1949-12-20
1950	1950-01-06	1950-12-19
1951	1951-01-05	1951-12-27
1952	1952-02-18	1952-11-26
1953	1953-01-15	1953-10-25
1954	1954-01-15	1954-12-13
1955	1955-01-15	1955-10-26
1956	1956-01-30	1956-12-22
1957	1957-01-07	1957-12-06
1958	1958-01-03	1958-12-31
1959	1959-01-02	1959-12-19
1960	1960-01-07	1960-12-26
1961	1961-01-01	1961-12-15
1962	1962-01-03	1962-12-30
1963	1963-01-11	1963-11-30
1964	1964-01-14	1964-12-06
1965	1965-02-27	1965-12-15
1966	1966-01-06	1966-11-08
1967	1967-02-26	1967-12-30
1968	1968-01-14	1968-07-05
1969	1969-01-17	1969-12-24
1970	1970-02-23	1970-12-22
1971	1971-01-31	1971-12-27
1972	1972-01-06	1972-12-09
1973	1973-01-11	1973-12-25
1974	1974-01-01	1974-12-29
1975	1975-01-01	1975-12-26
1976	1976-01-11	1976-12-23
1977	1977-01-16	1977-12-18
1978	1978-01-13	1978-12-25
1985	1985-06-02	1985-11-07
1986	1986-01-09	1986-12-06
1987	1987-01-03	1987-11-20
1988	1988-02-05	1988-12-26
1989	1989-01-25	1989-12-14
1990	1990-03-01	1990-12-08
1991	1991-01-16	1991-12-11
1992	1992-02-04	1992-12-18
1993	1993-07-08	1993-12-09
1994	1994-02-01	1994-11-30
1995	1995-01-04	1995-12-23
1996	1996-01-02	1996-12-07
1997	1997-01-01	1997-12-27
1998	1998-01-12	1998-12-31
1999	1999-01-01	1999-12-27
2000	2000-01-05	2000-12-28
2001	2001-01-31	2001-12-16
2002	2002-01-05	2002-12-21
2023	2023-01-12	2023-11-07

Every Fixed Threshold

Fixed thresholds at Isis Downs
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	84	36	1950	6
25 mm (0.98 in): Days with 25 mm or more rain	84	19	1950	3
50 mm (1.97 in): Days with 50 mm or more rain	57	7	1950	2
100 mm (3.94 in): Days with 100 mm or more rain	15	3	1990	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.

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Data for Isis Downs 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Isis Downs Threshold Days by Year

Key Facts for Isis Downs Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

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