Rooiwal Threshold Days by Year (SF001706390)

4 fixed thresholds counted per year at Rooiwal (SF001706390): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rooiwal Thresholds

Rooiwal: days with 10 mm (0.39 in) or more of precipitation in 76 years, most in 1974 with 21.
Rooiwal: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 1974 with 10.
Rooiwal: days with 50 mm (1.97 in) or more of precipitation in 20 years, most in 1988 with 3.
Rooiwal: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1918 with 1.
4 fixed thresholds have at least one qualifying day at Rooiwal.

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

76 years with a qualifying day

Days per year at Rooiwal with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 21 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at Rooiwal
Year	Days	Decade average
1918	12	8.5
1919	5	8.5
1920	12	9.5
1921	12	9.5
1922	4	9.5
1923	5	9.5
1924	12	9.5
1925	17	9.5
1926	6	9.5
1927	6	9.5
1928	9	9.5
1929	12	9.5
1930	9	8.3
1932	6	8.3
1933	3	8.3
1936	8	8.3
1937	9	8.3
1939	15	8.3
1940	14	9.4
1941	12	9.4
1942	10	9.4
1943	9	9.4
1944	5	9.4
1945	7	9.4
1946	12	9.4
1947	8	9.4
1948	14	9.4
1949	3	9.4
1950	13	10.9
1951	2	10.9
1952	12	10.9
1953	13	10.9
1954	7	10.9
1955	11	10.9
1956	13	10.9
1957	13	10.9
1958	17	10.9
1959	8	10.9
1960	10	10.7
1961	17	10.7
1962	6	10.7
1963	19	10.7
1964	8	10.7
1965	8	10.7
1966	6	10.7
1967	16	10.7
1968	8	10.7
1969	9	10.7
1970	9	13.9
1971	15	13.9
1972	12	13.9
1973	8	13.9
1974	21	13.9
1975	14	13.9
1976	21	13.9
1977	13	13.9
1978	15	13.9
1979	11	13.9
1980	6	11.9
1981	19	11.9
1982	10	11.9
1983	12	11.9
1984	9	11.9
1985	13	11.9
1986	8	11.9
1987	12	11.9
1988	21	11.9
1989	9	11.9
1990	10	12.3
1991	21	12.3
1992	9	12.3
1993	11	12.3
1994	10	12.3
1995	7	12.3
1996	17	12.3
1997	13	12.3

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

First to last qualifying date each year at Rooiwal
Year	First date	Last date
1918	1918-02-25	1918-10-29
1919	1919-01-21	1919-04-21
1920	1920-01-30	1920-12-16
1921	1921-02-04	1921-11-23
1922	1922-01-11	1922-11-21
1923	1923-01-10	1923-04-08
1924	1924-01-25	1924-12-15
1925	1925-01-01	1925-12-06
1926	1926-03-05	1926-11-17
1927	1927-04-13	1927-12-03
1928	1928-01-05	1928-11-23
1929	1929-01-20	1929-12-18
1930	1930-01-16	1930-11-16
1932	1932-02-11	1932-09-17
1933	1933-04-18	1933-11-03
1936	1936-02-12	1936-11-18
1937	1937-01-20	1937-12-16
1939	1939-01-21	1939-11-05
1940	1940-01-29	1940-11-09
1941	1941-01-05	1941-10-29
1942	1942-02-28	1942-12-03
1943	1943-02-23	1943-12-30
1944	1944-02-01	1944-10-22
1945	1945-01-06	1945-07-12
1946	1946-02-09	1946-11-25
1947	1947-03-05	1947-12-24
1948	1948-01-24	1948-12-14
1949	1949-01-31	1949-07-14
1950	1950-02-23	1950-12-13
1951	1951-02-14	1951-10-04
1952	1952-01-29	1952-12-15
1953	1953-01-12	1953-12-20
1954	1954-01-14	1954-04-30
1955	1955-01-21	1955-12-19
1956	1956-01-09	1956-12-10
1957	1957-02-10	1957-12-29
1958	1958-01-09	1958-12-26
1959	1959-01-24	1959-12-03
1960	1960-01-23	1960-11-25
1961	1961-01-02	1961-12-16
1962	1962-02-12	1962-11-17
1963	1963-01-02	1963-12-08
1964	1964-03-26	1964-11-04
1965	1965-01-14	1965-11-04
1966	1966-01-21	1966-12-19
1967	1967-01-29	1967-11-23
1968	1968-03-02	1968-12-23
1969	1969-02-24	1969-11-06
1970	1970-02-04	1970-11-13
1971	1971-01-18	1971-10-14
1972	1972-01-07	1972-10-13
1973	1973-02-17	1973-12-02
1974	1974-01-14	1974-12-16
1975	1975-01-22	1975-12-22
1976	1976-01-05	1976-11-04
1977	1977-01-28	1977-11-30
1978	1978-01-03	1978-12-09
1979	1979-01-25	1979-11-23
1980	1980-01-21	1980-11-29
1981	1981-01-24	1981-11-24
1982	1982-02-08	1982-10-18
1983	1983-02-01	1983-12-20
1984	1984-01-23	1984-11-27
1985	1985-01-13	1985-12-18
1986	1986-01-16	1986-12-28
1987	1987-02-09	1987-12-21
1988	1988-01-13	1988-12-31
1989	1989-01-01	1989-11-14
1990	1990-01-26	1990-12-04
1991	1991-01-14	1991-12-18
1992	1992-02-17	1992-10-31
1993	1993-02-06	1993-11-09
1994	1994-01-23	1994-11-12
1995	1995-01-21	1995-12-16
1996	1996-01-17	1996-12-28
1997	1997-01-04	1997-06-10

Every Fixed Threshold

Fixed thresholds at Rooiwal
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	76	21	1974	13
25 mm (0.98 in): Days with 25 mm or more rain	65	10	1974	5
50 mm (1.97 in): Days with 50 mm or more rain	20	3	1988	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1918	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.

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Data for Rooiwal 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).

Rooiwal Threshold Days by Year (SF001706390)

Key Facts for Rooiwal Thresholds

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

Every Fixed Threshold

Download the Data

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