Clanwilliam (Pol) Weather Records (SF000847010)

Record envelope, standing records and threshold days for Clanwilliam (Pol) (SF000847010), South Africa, with 129 years of record.

Key Facts for Clanwilliam (Pol)

Clanwilliam (Pol) (SF000847010) is a weather station in South Africa at -32.18 latitude and 18.90 longitude, 91 m (299 ft) above sea level.
The station reports from 1869 to 1997, 129 years of record.
0 records set at Clanwilliam (Pol) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Clanwilliam (Pol) tied a daily record precipitation of 5.5 mm (0.22 in) on 15 November 1997.

About the Station

Location: South Africa, -32.18 latitude, 18.90 longitude.
Elevation: 91 m (299 ft).
Period of record: 1869 to 1997, 129 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Clanwilliam (Pol). The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Clanwilliam (Pol), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

0 standing records

0 records at Clanwilliam (Pol) still stand.

All-Time Record Progression

2 new records

2 all-time records were set at Clanwilliam (Pol) between 14 July 1917 and 19 May 1954. Each dot is a new record.

When Clanwilliam (Pol) set new all-time records
Date	Kind	Detail
1917-07-14	Record daily precipitation	Record daily precipitation 65.5 mm (2.6 in)
1954-05-19	Record daily precipitation	Record daily precipitation 79.5 mm (3.1 in)

Wettest Day of Each Month

May: 79.5 mm (3.1 in)

The wettest day on record for each calendar month at Clanwilliam (Pol). The most was 79.5 mm (3.1 in) on 19 May 1954.

Record daily precipitation for each month at Clanwilliam (Pol)
Month	Record daily precipitation (mm)	Date
Jan	50.0 mm (2.0 in)	13 January 1985
Feb	44.5 mm (1.8 in)	8 February 1890
Mar	40.0 mm (1.6 in)	19 March 1973
Apr	75.0 mm (3.0 in)	15 April 1976
May	79.5 mm (3.1 in)	19 May 1954
Jun	49.0 mm (1.9 in)	2 June 1883
Jul	65.5 mm (2.6 in)	14 July 1917
Aug	45.5 mm (1.8 in)	9 August 1963
Sep	44.5 mm (1.8 in)	1 September 1946
Oct	31.0 mm (1.2 in)	31 October 1949
Nov	31.0 mm (1.2 in)	25 November 1874
Dec	35.3 mm (1.4 in)	4 December 1942

Latest Records

Latest records at Clanwilliam (Pol)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 November 1997	Clanwilliam (Pol), ZA	daily rain (Tie)	5.5 mm (0.22 in)	tie	8 years	3 of 100 (Routine)
27 June 1997	Clanwilliam (Pol), ZA	daily rain	40.0 mm (1.6 in)	20.9 mm (0.8 in)	84 years	68 of 100 (Major)
8 June 1997	Clanwilliam (Pol), ZA	daily rain	22.0 mm (0.9 in)	9.3 mm (0.37 in)	76 years	20 of 100 (Routine)
18 March 1997	Clanwilliam (Pol), ZA	daily rain	17.0 mm (0.7 in)	11.9 mm (0.5 in)	51 years	20 of 100 (Routine)
7 November 1996	Clanwilliam (Pol), ZA	daily rain	20.0 mm (0.8 in)	11.1 mm (0.4 in)	121 years	20 of 100 (Routine)
19 October 1996	Clanwilliam (Pol), ZA	daily rain	14.0 mm (0.6 in)	4.8 mm (0.19 in)	41 years	20 of 100 (Routine)
16 September 1996	Clanwilliam (Pol), ZA	daily rain	26.0 mm (1.0 in)	14.6 mm (0.6 in)	106 years	69 of 100 (Major)
26 August 1996	Clanwilliam (Pol), ZA	daily rain	22.0 mm (0.9 in)	9.0 mm (0.35 in)	34 years	20 of 100 (Routine)
13 February 1996	Clanwilliam (Pol), ZA	daily rain	8.5 mm (0.33 in)	4.2 mm (0.17 in)	65 years	20 of 100 (Routine)
17 December 1995	Clanwilliam (Pol), ZA	daily rain	25.0 mm (1.0 in)	15.9 mm (0.6 in)	74 years	59 of 100 (Notable)
23 September 1995	Clanwilliam (Pol), ZA	daily rain	6.5 mm (0.26 in)	0.7 mm (0.03 in)	64 years	20 of 100 (Routine)
20 May 1995	Clanwilliam (Pol), ZA	daily rain	14.0 mm (0.6 in)	4.3 mm (0.17 in)	36 years	20 of 100 (Routine)
17 March 1995	Clanwilliam (Pol), ZA	daily rain	16.5 mm (0.6 in)	10.5 mm (0.4 in)	24 years	20 of 100 (Routine)
26 June 1994	Clanwilliam (Pol), ZA	daily rain	21.0 mm (0.8 in)	7.0 mm (0.28 in)	43 years	20 of 100 (Routine)
3 March 1994	Clanwilliam (Pol), ZA	daily rain	7.0 mm (0.28 in)	0.4 mm (0.02 in)	106 years	20 of 100 (Routine)
20 August 1993	Clanwilliam (Pol), ZA	daily rain (Tie)	19.5 mm (0.8 in)	tie	31 years	4 of 100 (Routine)
1 May 1993	Clanwilliam (Pol), ZA	daily rain	25.0 mm (1.0 in)	12.8 mm (0.5 in)	72 years	50 of 100 (Notable)
5 April 1993	Clanwilliam (Pol), ZA	daily rain	15.0 mm (0.6 in)	3.6 mm (0.14 in)	76 years	20 of 100 (Routine)
29 March 1992	Clanwilliam (Pol), ZA	daily rain	14.5 mm (0.6 in)	6.5 mm (0.26 in)	14 years	20 of 100 (Routine)
21 October 1991	Clanwilliam (Pol), ZA	daily rain	15.0 mm (0.6 in)	6.9 mm (0.27 in)	44 years	20 of 100 (Routine)

Extremes by Year

1869 to 1997

Yearly extremes at Clanwilliam (Pol): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	79.5 mm (3.1 in)	1954	24.1 mm (0.9 in)	126
Wettest five days (Rx5day)	100.8 mm (4.0 in)	1954	38.1 mm (1.5 in)	126
Longest dry spell (CDD)	284 days	1873	66 days	126

Wettest day (Rx1day)

The wettest day of the year at Clanwilliam (Pol), 1869 to 1997. The record is 79.5 mm (3.1 in) in 1954, marked on the chart; the median year is 24.1 mm (0.9 in).

Wettest day (Rx1day) at Clanwilliam (Pol) by year
Year	Wettest day (Rx1day)
1869	37.1 mm (1.5 in)
1870	55.1 mm (2.2 in)
1871	19.8 mm (0.8 in)
1872	29.0 mm (1.1 in)
1873	5.8 mm (0.23 in)
1874	31.0 mm (1.2 in)
1875	33.0 mm (1.3 in)
1876	14.0 mm (0.6 in)
1877	32.8 mm (1.3 in)
1878	29.5 mm (1.2 in)
1879	32.5 mm (1.3 in)
1880	21.1 mm (0.8 in)
1881	40.6 mm (1.6 in)
1882	15.2 mm (0.6 in)
1883	49.0 mm (1.9 in)
1886	23.4 mm (0.9 in)
1887	16.5 mm (0.6 in)
1888	29.0 mm (1.1 in)
1889	17.8 mm (0.7 in)
1890	44.5 mm (1.8 in)
1891	27.9 mm (1.1 in)
1892	18.5 mm (0.7 in)
1893	23.9 mm (0.9 in)
1894	26.4 mm (1.0 in)
1895	21.6 mm (0.9 in)
1896	14.5 mm (0.6 in)
1897	27.9 mm (1.1 in)
1898	40.6 mm (1.6 in)
1899	30.5 mm (1.2 in)
1900	23.1 mm (0.9 in)
1901	23.1 mm (0.9 in)
1902	26.4 mm (1.0 in)
1903	30.7 mm (1.2 in)
1904	30.7 mm (1.2 in)
1905	12.2 mm (0.5 in)
1906	19.3 mm (0.8 in)
1907	19.8 mm (0.8 in)
1908	19.1 mm (0.8 in)
1909	40.6 mm (1.6 in)
1910	21.6 mm (0.9 in)
1911	24.1 mm (0.9 in)
1912	9.4 mm (0.37 in)
1913	24.9 mm (1.0 in)
1914	25.9 mm (1.0 in)
1915	22.1 mm (0.9 in)
1916	27.7 mm (1.1 in)
1917	65.5 mm (2.6 in)
1918	23.1 mm (0.9 in)
1919	16.5 mm (0.6 in)
1920	28.2 mm (1.1 in)
1921	32.0 mm (1.3 in)
1922	27.4 mm (1.1 in)
1923	34.8 mm (1.4 in)
1924	13.2 mm (0.5 in)
1925	30.0 mm (1.2 in)
1926	16.3 mm (0.6 in)
1927	14.7 mm (0.6 in)
1928	11.7 mm (0.5 in)
1929	20.8 mm (0.8 in)
1930	15.5 mm (0.6 in)
1931	22.1 mm (0.9 in)
1932	28.4 mm (1.1 in)
1933	21.1 mm (0.8 in)
1934	18.3 mm (0.7 in)
1935	22.4 mm (0.9 in)
1936	27.9 mm (1.1 in)
1937	15.2 mm (0.6 in)
1938	25.9 mm (1.0 in)
1939	24.4 mm (1.0 in)
1940	16.0 mm (0.6 in)
1941	36.3 mm (1.4 in)
1942	35.3 mm (1.4 in)
1943	13.0 mm (0.5 in)
1944	18.5 mm (0.7 in)
1945	20.1 mm (0.8 in)
1946	44.5 mm (1.8 in)
1947	18.8 mm (0.7 in)
1948	23.6 mm (0.9 in)
1949	31.0 mm (1.2 in)
1950	16.5 mm (0.6 in)
1951	30.7 mm (1.2 in)
1952	24.1 mm (0.9 in)
1953	30.5 mm (1.2 in)
1954	79.5 mm (3.1 in)
1955	23.3 mm (0.9 in)
1956	15.2 mm (0.6 in)
1957	30.3 mm (1.2 in)
1958	30.5 mm (1.2 in)
1959	24.0 mm (0.9 in)
1960	19.0 mm (0.7 in)
1961	34.6 mm (1.4 in)
1962	30.5 mm (1.2 in)
1963	45.5 mm (1.8 in)
1964	30.0 mm (1.2 in)
1965	20.0 mm (0.8 in)
1966	30.5 mm (1.2 in)
1967	37.0 mm (1.5 in)
1968	18.5 mm (0.7 in)
1969	10.5 mm (0.4 in)
1970	10.0 mm (0.4 in)
1971	14.0 mm (0.6 in)
1972	32.0 mm (1.3 in)
1973	40.0 mm (1.6 in)
1975	19.0 mm (0.7 in)
1976	75.0 mm (3.0 in)
1977	26.0 mm (1.0 in)
1978	16.5 mm (0.6 in)
1979	18.0 mm (0.7 in)
1980	15.5 mm (0.6 in)
1981	20.0 mm (0.8 in)
1982	15.5 mm (0.6 in)
1983	21.5 mm (0.8 in)
1984	35.0 mm (1.4 in)
1985	50.0 mm (2.0 in)
1986	19.0 mm (0.7 in)
1987	34.5 mm (1.4 in)
1988	16.0 mm (0.6 in)
1989	34.0 mm (1.3 in)
1990	32.5 mm (1.3 in)
1991	20.0 mm (0.8 in)
1992	15.0 mm (0.6 in)
1993	25.0 mm (1.0 in)
1994	21.0 mm (0.8 in)
1995	25.0 mm (1.0 in)
1996	26.0 mm (1.0 in)
1997	40.0 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Clanwilliam (Pol), 1869 to 1997. The record is 100.8 mm (4.0 in) in 1954, marked on the chart; the median year is 38.1 mm (1.5 in).

Wettest five days (Rx5day) at Clanwilliam (Pol) by year
Year	Wettest five days (Rx5day)
1869	94.5 mm (3.7 in)
1870	69.6 mm (2.7 in)
1871	39.4 mm (1.6 in)
1872	43.5 mm (1.7 in)
1873	5.8 mm (0.23 in)
1874	39.9 mm (1.6 in)
1875	50.8 mm (2.0 in)
1876	14.0 mm (0.6 in)
1877	35.1 mm (1.4 in)
1878	47.5 mm (1.9 in)
1879	32.5 mm (1.3 in)
1880	38.1 mm (1.5 in)
1881	57.4 mm (2.3 in)
1882	28.4 mm (1.1 in)
1883	62.2 mm (2.4 in)
1886	46.8 mm (1.8 in)
1887	29.2 mm (1.1 in)
1888	47.8 mm (1.9 in)
1889	34.6 mm (1.4 in)
1890	52.9 mm (2.1 in)
1891	50.0 mm (2.0 in)
1892	24.1 mm (0.9 in)
1893	65.5 mm (2.6 in)
1894	42.4 mm (1.7 in)
1895	37.1 mm (1.5 in)
1896	16.3 mm (0.6 in)
1897	42.6 mm (1.7 in)
1898	59.1 mm (2.3 in)
1899	53.4 mm (2.1 in)
1900	46.0 mm (1.8 in)
1901	39.1 mm (1.5 in)
1902	32.1 mm (1.3 in)
1903	30.7 mm (1.2 in)
1904	34.8 mm (1.4 in)
1905	29.2 mm (1.1 in)
1906	32.7 mm (1.3 in)
1907	23.6 mm (0.9 in)
1908	39.4 mm (1.6 in)
1909	53.2 mm (2.1 in)
1910	35.6 mm (1.4 in)
1911	38.1 mm (1.5 in)
1912	16.0 mm (0.6 in)
1913	32.8 mm (1.3 in)
1914	47.3 mm (1.9 in)
1915	38.8 mm (1.5 in)
1916	38.5 mm (1.5 in)
1917	87.5 mm (3.4 in)
1918	35.3 mm (1.4 in)
1919	26.9 mm (1.1 in)
1920	44.1 mm (1.7 in)
1921	65.4 mm (2.6 in)
1922	36.5 mm (1.4 in)
1923	43.1 mm (1.7 in)
1924	17.0 mm (0.7 in)
1925	95.7 mm (3.8 in)
1926	23.4 mm (0.9 in)
1927	21.6 mm (0.9 in)
1928	21.6 mm (0.9 in)
1929	32.0 mm (1.3 in)
1930	28.5 mm (1.1 in)
1931	31.3 mm (1.2 in)
1932	33.8 mm (1.3 in)
1933	24.2 mm (1.0 in)
1934	26.4 mm (1.0 in)
1935	34.6 mm (1.4 in)
1936	32.5 mm (1.3 in)
1937	22.9 mm (0.9 in)
1938	25.9 mm (1.0 in)
1939	47.0 mm (1.9 in)
1940	29.8 mm (1.2 in)
1941	60.8 mm (2.4 in)
1942	45.7 mm (1.8 in)
1943	30.0 mm (1.2 in)
1944	35.7 mm (1.4 in)
1945	48.4 mm (1.9 in)
1946	78.8 mm (3.1 in)
1947	36.6 mm (1.4 in)
1948	27.2 mm (1.1 in)
1949	50.1 mm (2.0 in)
1950	27.0 mm (1.1 in)
1951	46.5 mm (1.8 in)
1952	35.6 mm (1.4 in)
1953	51.4 mm (2.0 in)
1954	100.8 mm (4.0 in)
1955	45.8 mm (1.8 in)
1956	24.8 mm (1.0 in)
1957	51.4 mm (2.0 in)
1958	40.8 mm (1.6 in)
1959	38.0 mm (1.5 in)
1960	22.5 mm (0.9 in)
1961	47.2 mm (1.9 in)
1962	57.5 mm (2.3 in)
1963	60.0 mm (2.4 in)
1964	48.7 mm (1.9 in)
1965	22.9 mm (0.9 in)
1966	41.5 mm (1.6 in)
1967	78.0 mm (3.1 in)
1968	31.0 mm (1.2 in)
1969	12.5 mm (0.5 in)
1970	28.5 mm (1.1 in)
1971	31.0 mm (1.2 in)
1972	34.0 mm (1.3 in)
1973	40.0 mm (1.6 in)
1975	53.5 mm (2.1 in)
1976	83.0 mm (3.3 in)
1977	41.5 mm (1.6 in)
1978	25.2 mm (1.0 in)
1979	31.0 mm (1.2 in)
1980	26.0 mm (1.0 in)
1981	24.0 mm (0.9 in)
1982	24.5 mm (1.0 in)
1983	38.0 mm (1.5 in)
1984	67.0 mm (2.6 in)
1985	58.0 mm (2.3 in)
1986	41.9 mm (1.6 in)
1987	37.0 mm (1.5 in)
1988	23.5 mm (0.9 in)
1989	43.0 mm (1.7 in)
1990	43.5 mm (1.7 in)
1991	42.1 mm (1.7 in)
1992	25.5 mm (1.0 in)
1993	37.0 mm (1.5 in)
1994	49.5 mm (1.9 in)
1995	25.0 mm (1.0 in)
1996	48.0 mm (1.9 in)
1997	62.5 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Clanwilliam (Pol), 1869 to 1997. The record is 284 days in 1873, marked on the chart; the median year is 66 days.

Longest dry spell (CDD) at Clanwilliam (Pol) by year
Year	Longest dry spell (CDD)
1869	131 days
1870	61 days
1871	129 days
1872	113 days
1873	284 days
1874	93 days
1875	119 days
1876	284 days
1877	65 days
1878	69 days
1879	60 days
1880	56 days
1881	54 days
1882	61 days
1883	89 days
1886	68 days
1887	48 days
1888	54 days
1889	55 days
1890	38 days
1891	59 days
1892	85 days
1893	69 days
1894	49 days
1895	70 days
1896	62 days
1897	71 days
1898	71 days
1899	61 days
1900	73 days
1901	66 days
1902	153 days
1903	54 days
1904	82 days
1905	74 days
1906	62 days
1907	76 days
1908	60 days
1909	51 days
1910	40 days
1911	106 days
1912	252 days
1913	102 days
1914	73 days
1915	76 days
1916	77 days
1917	49 days
1918	42 days
1919	58 days
1920	71 days
1921	39 days
1922	53 days
1923	78 days
1924	75 days
1925	38 days
1926	50 days
1927	57 days
1928	79 days
1929	82 days
1930	47 days
1931	73 days
1932	59 days
1933	61 days
1934	35 days
1935	58 days
1936	66 days
1937	86 days
1938	54 days
1939	50 days
1940	73 days
1941	68 days
1942	98 days
1943	41 days
1944	74 days
1945	89 days
1946	76 days
1947	80 days
1948	50 days
1949	83 days
1950	53 days
1951	102 days
1952	49 days
1953	71 days
1954	69 days
1955	47 days
1956	49 days
1957	64 days
1958	45 days
1959	66 days
1960	98 days
1961	84 days
1962	54 days
1963	43 days
1964	53 days
1965	40 days
1966	86 days
1967	48 days
1968	96 days
1969	64 days
1970	108 days
1971	62 days
1972	51 days
1973	72 days
1975	31 days
1976	54 days
1977	48 days
1978	66 days
1979	71 days
1980	98 days
1981	56 days
1982	78 days
1983	58 days
1984	69 days
1985	47 days
1986	59 days
1987	98 days
1988	66 days
1989	58 days
1990	68 days
1991	55 days
1992	61 days
1993	72 days
1994	71 days
1995	32 days
1996	42 days
1997	76 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

115 years, 1870 to 1996

A day with at least 23.6 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 66.5 mm (2.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Clanwilliam (Pol): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	23.6 mm (0.9 in)
5 years	33.4 mm (1.3 in)
10 years	40.6 mm (1.6 in)
25 years	50.3 mm (2.0 in)
50 years	58.2 mm (2.3 in)
100 years	66.5 mm (2.6 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 115 years of values from 1870 to 1996.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 79.5 mm (3.1 in) in 1954; 75.0 mm (3.0 in) in 1976; 65.5 mm (2.6 in) in 1917.

Download the Data

Data for Clanwilliam (Pol) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clanwilliam (Pol) 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a