Grootfontein Threshold Days by Year (SF001433450)

4 fixed thresholds counted per year at Grootfontein (SF001433450): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grootfontein Thresholds

Grootfontein: days with 10 mm (0.39 in) or more of precipitation in 76 years, most in 1988 with 23.
Grootfontein: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1974 with 9.
Grootfontein: days with 50 mm (1.97 in) or more of precipitation in 14 years, most in 1918 with 2.
Grootfontein: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1918 with 1.
4 fixed thresholds have at least one qualifying day at Grootfontein.

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

76 years with a qualifying day

Days per year at Grootfontein with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 23 in 1988.

Days with 10 mm (0.39 in) or more of precipitation per year at Grootfontein
Year	Days	Decade average
1913	11	9.4
1914	7	9.4
1915	3	9.4
1916	10	9.4
1917	14	9.4
1918	12	9.4
1919	9	9.4
1920	11	10.5
1921	19	10.5
1922	4	10.5
1923	13	10.5
1924	7	10.5
1925	11	10.5
1926	5	10.5
1927	3	10.5
1928	12	10.5
1929	20	10.5
1930	13	10.4
1931	12	10.4
1932	8	10.4
1933	7	10.4
1934	16	10.4
1935	14	10.4
1936	6	10.4
1937	8	10.4
1938	5	10.4
1939	15	10.4
1940	12	10.3
1941	10	10.3
1942	13	10.3
1943	15	10.3
1944	9	10.3
1945	8	10.3
1946	11	10.3
1947	10	10.3
1948	12	10.3
1949	3	10.3
1950	17	10.1
1951	1	10.1
1952	11	10.1
1953	8	10.1
1954	11	10.1
1955	12	10.1
1956	13	10.1
1957	10	10.1
1958	13	10.1
1959	5	10.1
1960	9	9.1
1961	14	9.1
1962	7	9.1
1963	16	9.1
1964	6	9.1
1965	9	9.1
1966	4	9.1
1967	10	9.1
1968	8	9.1
1969	8	9.1
1970	7	12.6
1971	9	12.6
1972	7	12.6
1973	13	12.6
1974	22	12.6
1975	13	12.6
1976	19	12.6
1977	19	12.6
1978	6	12.6
1979	11	12.6
1980	8	12.7
1981	20	12.7
1982	12	12.7
1983	11	12.7
1984	8	12.7
1985	14	12.7
1986	8	12.7
1987	10	12.7
1988	23	12.7

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

First to last qualifying date each year at Grootfontein
Year	First date	Last date
1913	1913-02-01	1913-10-09
1914	1914-01-21	1914-12-03
1915	1915-02-14	1915-04-12
1916	1916-01-18	1916-11-21
1917	1917-01-19	1917-11-17
1918	1918-01-01	1918-10-29
1919	1919-02-17	1919-12-27
1920	1920-01-30	1920-10-24
1921	1921-02-03	1921-12-08
1922	1922-01-10	1922-11-21
1923	1923-01-14	1923-11-13
1924	1924-01-25	1924-11-05
1925	1925-02-13	1925-11-23
1926	1926-03-23	1926-12-27
1927	1927-03-15	1927-07-24
1928	1928-01-04	1928-09-05
1929	1929-01-18	1929-12-28
1930	1930-01-14	1930-11-12
1931	1931-01-08	1931-12-31
1932	1932-02-07	1932-09-17
1933	1933-02-28	1933-12-26
1934	1934-01-01	1934-12-20
1935	1935-01-13	1935-11-02
1936	1936-02-25	1936-11-17
1937	1937-01-31	1937-12-18
1938	1938-01-28	1938-11-03
1939	1939-01-01	1939-10-20
1940	1940-02-03	1940-11-09
1941	1941-01-05	1941-08-19
1942	1942-02-12	1942-12-19
1943	1943-01-21	1943-12-11
1944	1944-02-09	1944-10-22
1945	1945-01-06	1945-12-30
1946	1946-01-18	1946-11-25
1947	1947-02-09	1947-12-24
1948	1948-01-22	1948-04-19
1949	1949-03-05	1949-05-10
1950	1950-01-08	1950-12-24
1951	1951-03-27	1951-03-27
1952	1952-01-29	1952-12-15
1953	1953-02-22	1953-12-19
1954	1954-03-05	1954-12-08
1955	1955-02-09	1955-12-19
1956	1956-01-14	1956-12-20
1957	1957-01-30	1957-12-29
1958	1958-01-02	1958-12-28
1959	1959-01-24	1959-12-03
1960	1960-01-28	1960-10-12
1961	1961-03-12	1961-12-15
1962	1962-01-18	1962-11-20
1963	1963-01-16	1963-12-08
1964	1964-09-20	1964-12-03
1965	1965-04-05	1965-11-15
1966	1966-01-29	1966-11-09
1967	1967-01-29	1967-11-23
1968	1968-03-12	1968-10-22
1969	1969-01-06	1969-10-27
1970	1970-02-05	1970-12-05
1971	1971-02-20	1971-12-01
1972	1972-01-06	1972-04-12
1973	1973-02-17	1973-12-22
1974	1974-01-08	1974-11-02
1975	1975-01-22	1975-12-17
1976	1976-01-03	1976-12-25
1977	1977-01-28	1977-12-30
1978	1978-01-23	1978-12-09
1979	1979-02-21	1979-12-22
1980	1980-01-20	1980-12-13
1981	1981-01-25	1981-11-25
1982	1982-03-03	1982-12-05
1983	1983-02-01	1983-12-30
1984	1984-03-11	1984-11-28
1985	1985-01-14	1985-12-19
1986	1986-01-18	1986-10-04
1987	1987-02-09	1987-12-22
1988	1988-02-09	1988-12-28

Every Fixed Threshold

Fixed thresholds at Grootfontein
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	23	1988	23
25 mm (0.98 in): Days with 25 mm or more rain	66	9	1974	7
50 mm (1.97 in): Days with 50 mm or more rain	14	2	1918	1
100 mm (3.94 in): Days with 100 mm or more rain	2	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 1913.

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Data for Grootfontein 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).

Grootfontein Threshold Days by Year (SF001433450)

Key Facts for Grootfontein Thresholds

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

Every Fixed Threshold

Download the Data

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