Rietvallei Threshold Days by Year (SF005554410)

4 fixed thresholds counted per year at Rietvallei (SF005554410): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rietvallei Thresholds

Rietvallei: days with 10 mm (0.39 in) or more of precipitation in 73 years, most in 1925 with 47.
Rietvallei: days with 25 mm (0.98 in) or more of precipitation in 73 years, most in 1946 with 21.
Rietvallei: days with 50 mm (1.97 in) or more of precipitation in 63 years, most in 1925 with 7.
Rietvallei: days with 100 mm (3.94 in) or more of precipitation in 12 years, most in 1946 with 2.
4 fixed thresholds have at least one qualifying day at Rietvallei.

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

73 years with a qualifying day

Days per year at Rietvallei with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 47 in 1925.

Days with 10 mm (0.39 in) or more of precipitation per year at Rietvallei
Year	Days	Decade average
1916	22	30.8
1917	42	30.8
1918	36	30.8
1919	23	30.8
1920	25	31.6
1921	37	31.6
1922	32	31.6
1923	27	31.6
1924	34	31.6
1925	47	31.6
1926	30	31.6
1927	32	31.6
1928	24	31.6
1929	28	31.6
1931	30	29.6
1932	21	29.6
1933	24	29.6
1934	29	29.6
1935	18	29.6
1936	32	29.6
1937	38	29.6
1938	32	29.6
1939	42	29.6
1941	24	31.4
1942	31	31.4
1943	39	31.4
1944	27	31.4
1945	23	31.4
1946	38	31.4
1947	45	31.4
1948	26	31.4
1949	30	31.4
1950	31	31.8
1951	29	31.8
1955	36	31.8
1957	36	31.8
1958	27	31.8
1960	33	29.8
1961	33	29.8
1962	25	29.8
1963	29	29.8
1964	30	29.8
1965	20	29.8
1966	24	29.8
1967	32	29.8
1968	30	29.8
1969	42	29.8
1970	21	29.9
1971	38	29.9
1972	31	29.9
1973	30	29.9
1974	30	29.9
1975	28	29.9
1976	35	29.9
1977	37	29.9
1978	27	29.9
1979	22	29.9
1980	35	30
1981	33	30
1982	20	30
1983	33	30
1984	27	30
1985	24	30
1986	28	30
1987	30	30
1988	30	30
1989	40	30
1990	31	27.8
1991	31	27.8
1992	22	27.8
1994	20	27.8
1995	23	27.8
1996	40	27.8

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

First to last qualifying date each year at Rietvallei
Year	First date	Last date
1916	1916-01-16	1916-12-22
1917	1917-01-01	1917-12-31
1918	1918-01-01	1918-12-31
1919	1919-01-01	1919-12-16
1920	1920-01-11	1920-12-31
1921	1921-01-10	1921-12-31
1922	1922-01-11	1922-12-30
1923	1923-01-14	1923-12-29
1924	1924-01-10	1924-12-26
1925	1925-01-04	1925-12-29
1926	1926-01-02	1926-12-23
1927	1927-01-15	1927-11-28
1928	1928-01-01	1928-12-27
1929	1929-01-12	1929-12-20
1931	1931-01-01	1931-12-31
1932	1932-01-04	1932-12-26
1933	1933-01-13	1933-12-23
1934	1934-01-01	1934-12-29
1935	1935-01-07	1935-12-27
1936	1936-01-11	1936-12-30
1937	1937-01-02	1937-12-24
1938	1938-01-05	1938-12-31
1939	1939-01-01	1939-12-29
1941	1941-02-06	1941-12-21
1942	1942-01-01	1942-12-31
1943	1943-01-03	1943-12-26
1944	1944-02-01	1944-12-31
1945	1945-01-03	1945-12-30
1946	1946-01-06	1946-12-21
1947	1947-01-02	1947-12-31
1948	1948-01-01	1948-12-21
1949	1949-01-12	1949-12-28
1950	1950-01-06	1950-12-26
1951	1951-01-12	1951-12-26
1955	1955-02-04	1955-12-31
1957	1957-01-19	1957-12-21
1958	1958-02-05	1958-12-29
1960	1960-01-10	1960-12-30
1961	1961-01-05	1961-12-26
1962	1962-01-09	1962-12-22
1963	1963-01-04	1963-12-30
1964	1964-01-07	1964-12-31
1965	1965-01-06	1965-12-29
1966	1966-01-08	1966-12-21
1967	1967-01-03	1967-12-09
1968	1968-01-06	1968-12-29
1969	1969-01-07	1969-12-24
1970	1970-01-24	1970-12-30
1971	1971-01-02	1971-12-19
1972	1972-01-03	1972-12-23
1973	1973-01-04	1973-12-27
1974	1974-01-15	1974-12-24
1975	1975-01-03	1975-12-27
1976	1976-01-01	1976-12-28
1977	1977-01-11	1977-12-31
1978	1978-01-02	1978-12-29
1979	1979-01-02	1979-12-25
1980	1980-01-01	1980-12-27
1981	1981-01-04	1981-12-30
1982	1982-01-01	1982-12-18
1983	1983-01-01	1983-12-25
1984	1984-01-08	1984-12-12
1985	1985-01-05	1985-12-07
1986	1986-01-05	1986-12-28
1987	1987-01-19	1987-12-26
1988	1988-01-06	1988-12-26
1989	1989-01-03	1989-12-14
1990	1990-01-10	1990-12-16
1991	1991-01-05	1991-12-20
1992	1992-01-06	1992-12-23
1994	1994-01-03	1994-12-26
1995	1995-01-08	1995-12-26
1996	1996-01-09	1996-12-19

Every Fixed Threshold

Fixed thresholds at Rietvallei
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	73	47	1925	40
25 mm (0.98 in): Days with 25 mm or more rain	73	21	1946	16
50 mm (1.97 in): Days with 50 mm or more rain	63	7	1925	2
100 mm (3.94 in): Days with 100 mm or more rain	12	2	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 1916.

Download the Data

Data for Rietvallei 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).

Rietvallei Threshold Days by Year (SF005554410)

Key Facts for Rietvallei Thresholds

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

Every Fixed Threshold

Download the Data

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