Jonkersdam Threshold Days by Year (SF004412610)

4 fixed thresholds counted per year at Jonkersdam (SF004412610): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Jonkersdam Thresholds

Jonkersdam: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1987 with 40.
Jonkersdam: days with 25 mm (0.98 in) or more of precipitation in 71 years, most in 1967 with 13.
Jonkersdam: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 1929 with 4.
Jonkersdam: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1960 with 1.
4 fixed thresholds have at least one qualifying day at Jonkersdam.

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

72 years with a qualifying day

Days per year at Jonkersdam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1987.

Days with 10 mm (0.39 in) or more of precipitation per year at Jonkersdam
Year	Days	Decade average
1918	35	26
1919	17	26
1920	22	23.9
1921	30	23.9
1922	21	23.9
1923	21	23.9
1924	21	23.9
1925	22	23.9
1928	20	23.9
1929	34	23.9
1931	28	26.3
1932	19	26.3
1934	23	26.3
1935	13	26.3
1936	37	26.3
1937	26	26.3
1938	28	26.3
1939	36	26.3
1940	31	24.6
1941	18	24.6
1942	23	24.6
1943	35	24.6
1944	22	24.6
1945	18	24.6
1946	28	24.6
1947	25	24.6
1948	19	24.6
1949	27	24.6
1951	19	21.7
1952	19	21.7
1953	21	21.7
1954	15	21.7
1955	22	21.7
1956	17	21.7
1957	28	21.7
1958	26	21.7
1959	28	21.7
1960	29	25.9
1961	28	25.9
1962	22	25.9
1963	23	25.9
1964	38	25.9
1965	17	25.9
1966	16	25.9
1967	39	25.9
1968	23	25.9
1969	24	25.9
1972	19	23.1
1973	28	23.1
1974	28	23.1
1975	28	23.1
1976	22	23.1
1977	17	23.1
1979	20	23.1
1980	19	22.4
1981	17	22.4
1982	16	22.4
1983	22	22.4
1984	17	22.4
1985	21	22.4
1986	19	22.4
1987	40	22.4
1988	22	22.4
1989	31	22.4
1990	23	23.3
1991	19	23.3
1992	12	23.3
1993	28	23.3
1994	17	23.3
1995	33	23.3
1996	28	23.3
1997	26	23.3

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

First to last qualifying date each year at Jonkersdam
Year	First date	Last date
1918	1918-01-02	1918-12-31
1919	1919-01-08	1919-12-22
1920	1920-01-01	1920-12-21
1921	1921-01-05	1921-12-30
1922	1922-01-10	1922-12-19
1923	1923-01-01	1923-12-28
1924	1924-01-09	1924-12-29
1925	1925-02-01	1925-12-28
1928	1928-01-13	1928-12-24
1929	1929-01-07	1929-12-18
1931	1931-01-13	1931-12-22
1932	1932-01-14	1932-11-30
1934	1934-01-01	1934-12-26
1935	1935-01-22	1935-12-30
1936	1936-01-01	1936-12-30
1937	1937-01-04	1937-12-24
1938	1938-01-12	1938-12-30
1939	1939-01-01	1939-12-27
1940	1940-01-05	1940-12-29
1941	1941-01-10	1941-12-18
1942	1942-01-04	1942-12-16
1943	1943-01-12	1943-12-29
1944	1944-01-03	1944-12-06
1945	1945-01-22	1945-12-20
1946	1946-01-07	1946-12-22
1947	1947-01-03	1947-12-25
1948	1948-01-04	1948-12-16
1949	1949-01-04	1949-12-19
1951	1951-01-01	1951-12-16
1952	1952-01-02	1952-12-23
1953	1953-01-06	1953-11-30
1954	1954-01-07	1954-11-28
1955	1955-01-03	1955-12-29
1956	1956-01-15	1956-12-25
1957	1957-01-10	1957-12-09
1958	1958-01-04	1958-12-31
1959	1959-01-01	1959-12-30
1960	1960-01-24	1960-12-25
1961	1961-01-14	1961-12-17
1962	1962-01-05	1962-12-11
1963	1963-01-05	1963-12-11
1964	1964-01-01	1964-12-29
1965	1965-01-07	1965-11-27
1966	1966-01-17	1966-12-21
1967	1967-01-03	1967-12-21
1968	1968-01-09	1968-12-22
1969	1969-01-06	1969-12-23
1972	1972-01-01	1972-12-18
1973	1973-01-03	1973-12-18
1974	1974-01-04	1974-12-27
1975	1975-01-15	1975-12-21
1976	1976-01-07	1976-12-28
1977	1977-01-10	1977-12-31
1979	1979-01-01	1979-12-03
1980	1980-01-07	1980-12-31
1981	1981-01-03	1981-12-15
1982	1982-01-02	1982-12-19
1983	1983-01-13	1983-12-31
1984	1984-01-07	1984-12-20
1985	1985-01-15	1985-12-28
1986	1986-01-18	1986-12-28
1987	1987-01-01	1987-12-26
1988	1988-01-13	1988-12-29
1989	1989-01-08	1989-12-28
1990	1990-01-10	1990-12-30
1991	1991-01-03	1991-12-29
1992	1992-01-12	1992-12-12
1993	1993-01-08	1993-12-29
1994	1994-01-09	1994-12-26
1995	1995-01-13	1995-12-24
1996	1996-01-02	1996-12-22
1997	1997-01-20	1997-11-29

Every Fixed Threshold

Fixed thresholds at Jonkersdam
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	72	40	1987	26
25 mm (0.98 in): Days with 25 mm or more rain	71	13	1967	8
50 mm (1.97 in): Days with 50 mm or more rain	42	4	1929	3
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1918.

Download the Data

Data for Jonkersdam 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).

Jonkersdam Threshold Days by Year (SF004412610)

Key Facts for Jonkersdam Thresholds

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

Every Fixed Threshold

Download the Data

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