Sydenham Threshold Days by Year (ASN00087062)

4 fixed thresholds counted per year at Sydenham (ASN00087062): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sydenham Thresholds

Sydenham: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1978 with 29.
Sydenham: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1950 with 8.
Sydenham: days with 50 mm (1.97 in) or more of precipitation in 17 years, most in 1949 with 4.
Sydenham: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1946 with 1.
4 fixed thresholds have at least one qualifying day at Sydenham.

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

56 years with a qualifying day

Days per year at Sydenham with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 29 in 1978.

Days with 10 mm (0.39 in) or more of precipitation per year at Sydenham
Year	Days	Decade average
1931	18	14.9
1932	18	14.9
1933	13	14.9
1934	17	14.9
1935	16	14.9
1936	13	14.9
1937	15	14.9
1938	9	14.9
1939	15	14.9
1940	10	12.9
1941	19	12.9
1942	15	12.9
1943	9	12.9
1944	8	12.9
1945	12	12.9
1946	15	12.9
1947	16	12.9
1948	6	12.9
1949	19	12.9
1950	19	15.1
1951	12	15.1
1952	20	15.1
1953	14	15.1
1954	19	15.1
1955	17	15.1
1956	11	15.1
1957	8	15.1
1958	17	15.1
1959	14	15.1
1960	19	13.1
1961	12	13.1
1962	12	13.1
1963	16	13.1
1964	19	13.1
1965	13	13.1
1966	17	13.1
1967	3	13.1
1968	7	13.1
1971	15	17.9
1972	16	17.9
1974	26	17.9
1975	18	17.9
1976	13	17.9
1978	29	17.9
1979	8	17.9
1980	11	13.4
1981	16	13.4
1982	10	13.4
1983	18	13.4
1984	7	13.4
1985	17	13.4
1986	8	13.4
1987	20	13.4
1988	14	13.4
1989	13	13.4
1990	13	13

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

First to last qualifying date each year at Sydenham
Year	First date	Last date
1931	1931-01-26	1931-11-21
1932	1932-02-06	1932-12-24
1933	1933-01-24	1933-12-26
1934	1934-01-09	1934-12-01
1935	1935-01-03	1935-12-25
1936	1936-01-10	1936-12-29
1937	1937-01-03	1937-12-29
1938	1938-01-16	1938-11-04
1939	1939-02-24	1939-11-27
1940	1940-04-01	1940-12-20
1941	1941-01-04	1941-11-05
1942	1942-01-20	1942-12-19
1943	1943-01-17	1943-11-18
1944	1944-03-10	1944-12-09
1945	1945-01-31	1945-11-17
1946	1946-01-17	1946-12-28
1947	1947-02-04	1947-12-23
1948	1948-01-05	1948-10-01
1949	1949-02-21	1949-11-22
1950	1950-02-01	1950-12-30
1951	1951-01-07	1951-11-27
1952	1952-01-05	1952-12-11
1953	1953-01-06	1953-12-07
1954	1954-01-17	1954-12-12
1955	1955-02-06	1955-12-31
1956	1956-01-11	1956-11-16
1957	1957-03-14	1957-12-26
1958	1958-01-31	1958-11-29
1959	1959-01-26	1959-12-25
1960	1960-01-09	1960-12-16
1961	1961-01-01	1961-12-14
1962	1962-01-17	1962-11-11
1963	1963-01-28	1963-12-06
1964	1964-02-11	1964-12-09
1965	1965-04-05	1965-12-08
1966	1966-01-13	1966-12-26
1967	1967-05-19	1967-08-21
1968	1968-01-21	1968-12-27
1971	1971-01-25	1971-12-23
1972	1972-01-07	1972-11-10
1974	1974-01-04	1974-11-18
1975	1975-03-21	1975-12-30
1976	1976-02-09	1976-11-02
1978	1978-01-06	1978-12-26
1979	1979-01-21	1979-09-29
1980	1980-01-12	1980-12-14
1981	1981-01-10	1981-11-24
1982	1982-01-07	1982-12-09
1983	1983-01-02	1983-11-30
1984	1984-01-02	1984-11-11
1985	1985-01-03	1985-12-23
1986	1986-04-16	1986-12-17
1987	1987-01-03	1987-12-28
1988	1988-01-01	1988-12-26
1989	1989-01-04	1989-10-31
1990	1990-02-01	1990-12-20

Every Fixed Threshold

Fixed thresholds at Sydenham
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	56	29	1978	13
25 mm (0.98 in): Days with 25 mm or more rain	50	8	1950	2
50 mm (1.97 in): Days with 50 mm or more rain	17	4	1949	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1946	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1931.

Download the Data

Data for Sydenham 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Sydenham Threshold Days by Year (ASN00087062)

Key Facts for Sydenham Thresholds

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

Every Fixed Threshold

Download the Data

Related