Swellendam (Bos) Threshold Days by Year (SF000087510)

4 fixed thresholds counted per year at Swellendam (Bos) (SF000087510): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Swellendam (Bos) Thresholds

Swellendam (Bos): days with 10 mm (0.39 in) or more of precipitation in 67 years, most in 1976 with 40.
Swellendam (Bos): days with 25 mm (0.98 in) or more of precipitation in 67 years, most in 1971 with 15.
Swellendam (Bos): days with 50 mm (1.97 in) or more of precipitation in 53 years, most in 1931 with 5.
Swellendam (Bos): days with 100 mm (3.94 in) or more of precipitation in 10 years, most in 1962 with 2.
4 fixed thresholds have at least one qualifying day at Swellendam (Bos).

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

67 years with a qualifying day

Days per year at Swellendam (Bos) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1976.

Days with 10 mm (0.39 in) or more of precipitation per year at Swellendam (Bos)
Year	Days	Decade average
1930	23	24.9
1931	38	24.9
1932	23	24.9
1933	14	24.9
1934	31	24.9
1935	21	24.9
1936	26	24.9
1937	24	24.9
1939	24	24.9
1940	27	24.5
1941	22	24.5
1942	23	24.5
1943	31	24.5
1944	27	24.5
1945	25	24.5
1946	22	24.5
1947	27	24.5
1948	25	24.5
1949	16	24.5
1950	23	30
1951	25	30
1952	35	30
1953	28	30
1954	24	30
1955	32	30
1956	31	30
1957	36	30
1958	29	30
1959	37	30
1960	28	29.1
1961	32	29.1
1962	38	29.1
1963	30	29.1
1964	33	29.1
1965	29	29.1
1966	31	29.1
1967	31	29.1
1968	25	29.1
1969	14	29.1
1970	19	29.7
1971	34	29.7
1972	29	29.7
1973	20	29.7
1974	30	29.7
1975	27	29.7
1976	40	29.7
1977	35	29.7
1978	37	29.7
1979	26	29.7
1980	30	31
1981	35	31
1982	32	31
1983	30	31
1984	29	31
1985	33	31
1986	36	31
1987	22	31
1988	26	31
1989	37	31
1990	29	30
1991	30	30
1992	27	30
1993	32	30
1994	33	30
1995	35	30
1996	29	30
1997	25	30

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

First to last qualifying date each year at Swellendam (Bos)
Year	First date	Last date
1930	1930-01-13	1930-12-31
1931	1931-01-12	1931-12-31
1932	1932-01-24	1932-12-16
1933	1933-02-22	1933-12-16
1934	1934-01-12	1934-11-26
1935	1935-01-02	1935-12-15
1936	1936-02-05	1936-12-04
1937	1937-01-05	1937-11-11
1939	1939-02-01	1939-12-25
1940	1940-01-20	1940-11-10
1941	1941-01-13	1941-12-22
1942	1942-01-25	1942-12-22
1943	1943-01-20	1943-12-18
1944	1944-01-29	1944-11-09
1945	1945-02-16	1945-12-31
1946	1946-01-20	1946-11-19
1947	1947-01-07	1947-12-26
1948	1948-01-05	1948-12-02
1949	1949-01-14	1949-11-29
1950	1950-01-21	1950-12-31
1951	1951-01-12	1951-12-22
1952	1952-01-05	1952-12-18
1953	1953-01-11	1953-12-14
1954	1954-01-09	1954-11-07
1955	1955-01-19	1955-12-05
1956	1956-01-09	1956-12-17
1957	1957-01-28	1957-12-30
1958	1958-01-17	1958-12-28
1959	1959-01-01	1959-12-17
1960	1960-01-03	1960-12-29
1961	1961-01-04	1961-12-31
1962	1962-01-18	1962-12-27
1963	1963-01-01	1963-12-07
1964	1964-01-31	1964-11-08
1965	1965-01-29	1965-12-17
1966	1966-01-03	1966-12-31
1967	1967-01-27	1967-12-10
1968	1968-03-22	1968-11-15
1969	1969-01-20	1969-12-01
1970	1970-01-21	1970-12-06
1971	1971-01-23	1971-12-11
1972	1972-02-03	1972-12-15
1973	1973-01-22	1973-11-30
1974	1974-01-11	1974-11-08
1975	1975-01-01	1975-12-28
1976	1976-01-25	1976-12-30
1977	1977-02-04	1977-12-31
1978	1978-01-10	1978-12-22
1979	1979-01-01	1979-12-25
1980	1980-01-03	1980-12-27
1981	1981-01-07	1981-12-14
1982	1982-01-15	1982-12-22
1983	1983-01-21	1983-12-16
1984	1984-01-11	1984-12-27
1985	1985-01-09	1985-12-03
1986	1986-01-03	1986-12-29
1987	1987-01-18	1987-12-22
1988	1988-01-28	1988-12-29
1989	1989-01-15	1989-12-18
1990	1990-01-01	1990-12-24
1991	1991-01-07	1991-12-31
1992	1992-01-01	1992-12-27
1993	1993-01-10	1993-12-26
1994	1994-01-07	1994-12-26
1995	1995-01-06	1995-12-26
1996	1996-01-23	1996-11-21
1997	1997-01-31	1997-11-16

Every Fixed Threshold

Fixed thresholds at Swellendam (Bos)
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	67	40	1976	25
25 mm (0.98 in): Days with 25 mm or more rain	67	15	1971	11
50 mm (1.97 in): Days with 50 mm or more rain	53	5	1931	1
100 mm (3.94 in): Days with 100 mm or more rain	10	2	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1930.

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Data for Swellendam (Bos) 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).

Swellendam (Bos) Threshold Days by Year (SF000087510)

Key Facts for Swellendam (Bos) Thresholds

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

Every Fixed Threshold

Download the Data

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