Swellendam (Tnk) Weather Records (SF000087820)

Record envelope, standing records and threshold days for Swellendam (Tnk) (SF000087820), South Africa, with 110 years of record.

Key Facts for Swellendam (Tnk)

Swellendam (Tnk) (SF000087820) is a weather station in South Africa at -34.03 latitude and 20.45 longitude, 143 m (469 ft) above sea level.
The station reports from 1888 to 1997, 110 years of record.
0 records set at Swellendam (Tnk) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Swellendam (Tnk) set a daily record precipitation of 34.5 mm (1.4 in) on 19 July 1997.

About the Station

Location: South Africa, -34.03 latitude, 20.45 longitude.
Elevation: 143 m (469 ft).
Period of record: 1888 to 1997, 110 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 Swellendam (Tnk). 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 Swellendam (Tnk), 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 Swellendam (Tnk) still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Swellendam (Tnk) between 20 August 1962 and 20 August 1962. Each dot is a new record.

Wettest Day of Each Month

Aug: 178.5 mm (7.0 in)

The wettest day on record for each calendar month at Swellendam (Tnk). The most was 178.5 mm (7.0 in) on 20 August 1962.

Record daily precipitation for each month at Swellendam (Tnk)
Month	Record daily precipitation (mm)	Date
Jan	102.5 mm (4.0 in)	31 January 1964
Feb	162.6 mm (6.4 in)	11 February 1902
Mar	127.0 mm (5.0 in)	31 March 1907
Apr	133.6 mm (5.3 in)	14 April 1900
May	87.5 mm (3.4 in)	14 May 1963
Jun	61.0 mm (2.4 in)	6 June 1891
Jul	53.6 mm (2.1 in)	25 July 1911
Aug	178.5 mm (7.0 in)	20 August 1962
Sep	82.6 mm (3.3 in)	29 September 1918
Oct	111.8 mm (4.4 in)	12 October 1906
Nov	109.2 mm (4.3 in)	12 November 1903
Dec	109.7 mm (4.3 in)	23 December 1994

Latest Records

Latest records at Swellendam (Tnk)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 July 1997	Swellendam (Tnk), ZA	daily rain	34.5 mm (1.4 in)	4.0 mm (0.16 in)	16 years	18 of 100 (Routine)
21 November 1996	Swellendam (Tnk), ZA	daily rain	21.4 mm (0.8 in)	3.6 mm (0.14 in)	106 years	20 of 100 (Routine)
22 October 1996	Swellendam (Tnk), ZA	daily rain	41.2 mm (1.6 in)	9.7 mm (0.38 in)	25 years	25 of 100 (Routine)
2 March 1996	Swellendam (Tnk), ZA	daily rain	36.5 mm (1.4 in)	7.0 mm (0.28 in)	62 years	33 of 100 (Routine)
7 December 1995	Swellendam (Tnk), ZA	daily rain	29.5 mm (1.2 in)	12.5 mm (0.5 in)	16 years	25 of 100 (Routine)
19 April 1995	Swellendam (Tnk), ZA	daily rain	47.0 mm (1.9 in)	16.5 mm (0.6 in)	0 years	22 of 100 (Routine)
7 January 1995	Swellendam (Tnk), ZA	daily rain	41.3 mm (1.6 in)	28.8 mm (1.1 in)	4 years	33 of 100 (Routine)
23 December 1994	Swellendam (Tnk), ZA	monthly rain	109.7 mm (4.3 in)	43.7 mm (1.7 in)	92 years	86 of 100 (Exceptional)
9 December 1994	Swellendam (Tnk), ZA	daily rain	20.4 mm (0.8 in)	2.9 mm (0.11 in)	16 years	16 of 100 (Routine)
20 October 1994	Swellendam (Tnk), ZA	daily rain	38.0 mm (1.5 in)	7.5 mm (0.30 in)	49 years	30 of 100 (Routine)
2 August 1994	Swellendam (Tnk), ZA	daily rain	45.5 mm (1.8 in)	19.0 mm (0.7 in)	39 years	38 of 100 (Notable)
19 April 1994	Swellendam (Tnk), ZA	daily rain	30.5 mm (1.2 in)	4.0 mm (0.16 in)	4 years	13 of 100 (Routine)
2 December 1993	Swellendam (Tnk), ZA	daily rain	25.1 mm (1.0 in)	3.5 mm (0.14 in)	103 years	43 of 100 (Notable)
9 July 1993	Swellendam (Tnk), ZA	daily rain	30.3 mm (1.2 in)	8.5 mm (0.33 in)	38 years	30 of 100 (Routine)
2 May 1993	Swellendam (Tnk), ZA	daily rain	25.1 mm (1.0 in)	7.8 mm (0.31 in)	72 years	37 of 100 (Notable)
10 January 1993	Swellendam (Tnk), ZA	daily rain	85.0 mm (3.3 in)	51.5 mm (2.0 in)	89 years	76 of 100 (Major)
15 October 1992	Swellendam (Tnk), ZA	daily rain	56.2 mm (2.2 in)	18.1 mm (0.7 in)	52 years	40 of 100 (Notable)
22 July 1992	Swellendam (Tnk), ZA	daily rain	44.0 mm (1.7 in)	11.7 mm (0.5 in)	79 years	46 of 100 (Notable)
2 June 1992	Swellendam (Tnk), ZA	daily rain	58.0 mm (2.3 in)	33.9 mm (1.3 in)	75 years	70 of 100 (Major)
24 June 1991	Swellendam (Tnk), ZA	daily rain	31.0 mm (1.2 in)	11.5 mm (0.5 in)	13 years	27 of 100 (Routine)

Extremes by Year

1888 to 1997

Yearly extremes at Swellendam (Tnk): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	178.5 mm (7.0 in)	1962	57.1 mm (2.2 in)	110
Wettest five days (Rx5day)	320.6 mm (12.6 in)	1902	93.6 mm (3.7 in)	110
Longest dry spell (CDD)	69 days	1971	25 days	110

Wettest day (Rx1day)

The wettest day of the year at Swellendam (Tnk), 1888 to 1997. The record is 178.5 mm (7.0 in) in 1962, marked on the chart; the median year is 57.1 mm (2.2 in).

Wettest day (Rx1day) at Swellendam (Tnk) by year
Year	Wettest day (Rx1day)
1888	20.3 mm (0.8 in)
1889	62.2 mm (2.4 in)
1890	39.6 mm (1.6 in)
1891	61.0 mm (2.4 in)
1892	99.3 mm (3.9 in)
1893	65.0 mm (2.6 in)
1894	54.9 mm (2.2 in)
1895	58.7 mm (2.3 in)
1896	45.7 mm (1.8 in)
1897	77.7 mm (3.1 in)
1898	40.6 mm (1.6 in)
1899	63.5 mm (2.5 in)
1900	133.6 mm (5.3 in)
1901	62.2 mm (2.4 in)
1902	162.6 mm (6.4 in)
1903	109.2 mm (4.3 in)
1904	54.6 mm (2.1 in)
1905	78.2 mm (3.1 in)
1906	111.8 mm (4.4 in)
1907	127.0 mm (5.0 in)
1908	56.4 mm (2.2 in)
1909	53.8 mm (2.1 in)
1910	57.7 mm (2.3 in)
1911	86.4 mm (3.4 in)
1912	48.3 mm (1.9 in)
1913	43.2 mm (1.7 in)
1914	87.1 mm (3.4 in)
1915	27.4 mm (1.1 in)
1916	45.5 mm (1.8 in)
1917	41.9 mm (1.6 in)
1918	82.6 mm (3.3 in)
1919	86.4 mm (3.4 in)
1920	38.1 mm (1.5 in)
1921	161.8 mm (6.4 in)
1922	65.3 mm (2.6 in)
1923	53.3 mm (2.1 in)
1924	31.5 mm (1.2 in)
1925	95.3 mm (3.8 in)
1926	34.0 mm (1.3 in)
1927	57.2 mm (2.3 in)
1928	88.1 mm (3.5 in)
1929	56.4 mm (2.2 in)
1930	63.0 mm (2.5 in)
1931	64.5 mm (2.5 in)
1932	49.5 mm (1.9 in)
1933	48.3 mm (1.9 in)
1934	62.7 mm (2.5 in)
1935	46.5 mm (1.8 in)
1936	92.7 mm (3.6 in)
1937	41.9 mm (1.6 in)
1938	31.2 mm (1.2 in)
1939	45.7 mm (1.8 in)
1940	57.9 mm (2.3 in)
1941	95.3 mm (3.8 in)
1942	37.6 mm (1.5 in)
1943	71.1 mm (2.8 in)
1944	49.5 mm (1.9 in)
1945	57.4 mm (2.3 in)
1946	46.2 mm (1.8 in)
1947	50.5 mm (2.0 in)
1948	69.6 mm (2.7 in)
1949	46.5 mm (1.8 in)
1950	45.2 mm (1.8 in)
1951	80.3 mm (3.2 in)
1952	46.2 mm (1.8 in)
1953	45.0 mm (1.8 in)
1954	45.2 mm (1.8 in)
1955	68.5 mm (2.7 in)
1956	46.5 mm (1.8 in)
1957	64.0 mm (2.5 in)
1958	57.0 mm (2.2 in)
1959	47.0 mm (1.9 in)
1960	36.5 mm (1.4 in)
1961	30.5 mm (1.2 in)
1962	178.5 mm (7.0 in)
1963	87.5 mm (3.4 in)
1964	102.5 mm (4.0 in)
1965	50.0 mm (2.0 in)
1966	41.5 mm (1.6 in)
1967	63.0 mm (2.5 in)
1968	43.0 mm (1.7 in)
1969	50.0 mm (2.0 in)
1970	58.0 mm (2.3 in)
1971	95.0 mm (3.7 in)
1972	37.0 mm (1.5 in)
1973	48.0 mm (1.9 in)
1974	62.0 mm (2.4 in)
1975	42.0 mm (1.7 in)
1976	36.5 mm (1.4 in)
1977	87.0 mm (3.4 in)
1978	54.0 mm (2.1 in)
1979	67.0 mm (2.6 in)
1980	38.0 mm (1.5 in)
1981	69.5 mm (2.7 in)
1982	62.5 mm (2.5 in)
1983	41.7 mm (1.6 in)
1984	33.0 mm (1.3 in)
1985	61.8 mm (2.4 in)
1986	47.5 mm (1.9 in)
1987	64.3 mm (2.5 in)
1988	70.6 mm (2.8 in)
1989	40.7 mm (1.6 in)
1990	82.2 mm (3.2 in)
1991	83.0 mm (3.3 in)
1992	58.0 mm (2.3 in)
1993	85.0 mm (3.3 in)
1994	109.7 mm (4.3 in)
1995	47.0 mm (1.9 in)
1996	41.2 mm (1.6 in)
1997	36.6 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Swellendam (Tnk), 1888 to 1997. The record is 320.6 mm (12.6 in) in 1902, marked on the chart; the median year is 93.6 mm (3.7 in).

Wettest five days (Rx5day) at Swellendam (Tnk) by year
Year	Wettest five days (Rx5day)
1888	45.7 mm (1.8 in)
1889	134.6 mm (5.3 in)
1890	77.3 mm (3.0 in)
1891	102.9 mm (4.1 in)
1892	136.7 mm (5.4 in)
1893	116.9 mm (4.6 in)
1894	95.5 mm (3.8 in)
1895	91.2 mm (3.6 in)
1896	86.1 mm (3.4 in)
1897	128.0 mm (5.0 in)
1898	86.8 mm (3.4 in)
1899	89.9 mm (3.5 in)
1900	201.5 mm (7.9 in)
1901	113.0 mm (4.4 in)
1902	320.6 mm (12.6 in)
1903	227.8 mm (9.0 in)
1904	93.5 mm (3.7 in)
1905	81.3 mm (3.2 in)
1906	143.3 mm (5.6 in)
1907	139.2 mm (5.5 in)
1908	101.6 mm (4.0 in)
1909	81.7 mm (3.2 in)
1910	94.2 mm (3.7 in)
1911	165.9 mm (6.5 in)
1912	94.2 mm (3.7 in)
1913	66.3 mm (2.6 in)
1914	102.0 mm (4.0 in)
1915	48.0 mm (1.9 in)
1916	68.1 mm (2.7 in)
1917	52.0 mm (2.0 in)
1918	122.0 mm (4.8 in)
1919	126.3 mm (5.0 in)
1920	58.4 mm (2.3 in)
1921	205.0 mm (8.1 in)
1922	120.7 mm (4.8 in)
1923	85.3 mm (3.4 in)
1924	49.0 mm (1.9 in)
1925	107.5 mm (4.2 in)
1926	65.0 mm (2.6 in)
1927	62.3 mm (2.5 in)
1928	129.3 mm (5.1 in)
1929	88.4 mm (3.5 in)
1930	88.4 mm (3.5 in)
1931	201.1 mm (7.9 in)
1932	201.1 mm (7.9 in)
1933	66.3 mm (2.6 in)
1934	108.9 mm (4.3 in)
1935	67.0 mm (2.6 in)
1936	161.2 mm (6.3 in)
1937	82.1 mm (3.2 in)
1938	74.7 mm (2.9 in)
1939	97.7 mm (3.8 in)
1940	90.4 mm (3.6 in)
1941	122.7 mm (4.8 in)
1942	98.5 mm (3.9 in)
1943	141.3 mm (5.6 in)
1944	66.6 mm (2.6 in)
1945	104.9 mm (4.1 in)
1946	96.3 mm (3.8 in)
1947	89.9 mm (3.5 in)
1948	183.4 mm (7.2 in)
1949	115.7 mm (4.6 in)
1950	64.0 mm (2.5 in)
1951	107.9 mm (4.2 in)
1952	77.7 mm (3.1 in)
1953	83.7 mm (3.3 in)
1954	77.5 mm (3.1 in)
1955	132.0 mm (5.2 in)
1956	56.0 mm (2.2 in)
1957	81.5 mm (3.2 in)
1958	103.5 mm (4.1 in)
1959	67.0 mm (2.6 in)
1960	74.0 mm (2.9 in)
1961	45.5 mm (1.8 in)
1962	270.5 mm (10.6 in)
1963	93.5 mm (3.7 in)
1964	104.0 mm (4.1 in)
1965	88.5 mm (3.5 in)
1966	115.0 mm (4.5 in)
1967	92.5 mm (3.6 in)
1968	69.0 mm (2.7 in)
1969	57.0 mm (2.2 in)
1970	58.0 mm (2.3 in)
1971	123.5 mm (4.9 in)
1972	62.0 mm (2.4 in)
1973	62.5 mm (2.5 in)
1974	109.5 mm (4.3 in)
1975	60.0 mm (2.4 in)
1976	83.0 mm (3.3 in)
1977	117.5 mm (4.6 in)
1978	69.0 mm (2.7 in)
1979	98.6 mm (3.9 in)
1980	69.2 mm (2.7 in)
1981	156.8 mm (6.2 in)
1982	147.0 mm (5.8 in)
1983	80.3 mm (3.2 in)
1984	40.7 mm (1.6 in)
1985	83.0 mm (3.3 in)
1986	149.9 mm (5.9 in)
1987	68.2 mm (2.7 in)
1988	93.7 mm (3.7 in)
1989	146.0 mm (5.7 in)
1990	99.3 mm (3.9 in)
1991	102.6 mm (4.0 in)
1992	100.9 mm (4.0 in)
1993	85.0 mm (3.3 in)
1994	130.2 mm (5.1 in)
1995	67.0 mm (2.6 in)
1996	99.8 mm (3.9 in)
1997	80.4 mm (3.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Swellendam (Tnk), 1888 to 1997. The record is 69 days in 1971, marked on the chart; the median year is 25 days.

Longest dry spell (CDD) at Swellendam (Tnk) by year
Year	Longest dry spell (CDD)
1888	11 days
1889	16 days
1890	12 days
1891	23 days
1892	46 days
1893	12 days
1894	18 days
1895	21 days
1896	21 days
1897	28 days
1898	28 days
1899	37 days
1900	24 days
1901	26 days
1902	27 days
1903	35 days
1904	28 days
1905	31 days
1906	21 days
1907	37 days
1908	23 days
1909	16 days
1910	14 days
1911	15 days
1912	24 days
1913	30 days
1914	18 days
1915	35 days
1916	40 days
1917	22 days
1918	34 days
1919	21 days
1920	25 days
1921	15 days
1922	24 days
1923	26 days
1924	20 days
1925	26 days
1926	27 days
1927	19 days
1928	29 days
1929	19 days
1930	19 days
1931	15 days
1932	18 days
1933	30 days
1934	17 days
1935	34 days
1936	32 days
1937	25 days
1938	31 days
1939	28 days
1940	21 days
1941	20 days
1942	22 days
1943	32 days
1944	21 days
1945	17 days
1946	26 days
1947	15 days
1948	36 days
1949	25 days
1950	23 days
1951	32 days
1952	26 days
1953	22 days
1954	27 days
1955	27 days
1956	33 days
1957	61 days
1958	22 days
1959	27 days
1960	28 days
1961	32 days
1962	35 days
1963	27 days
1964	40 days
1965	35 days
1966	58 days
1967	26 days
1968	37 days
1969	37 days
1970	32 days
1971	69 days
1972	32 days
1973	41 days
1974	51 days
1975	36 days
1976	20 days
1977	22 days
1978	22 days
1979	22 days
1980	24 days
1981	28 days
1982	31 days
1983	20 days
1984	15 days
1985	20 days
1986	24 days
1987	37 days
1988	19 days
1989	23 days
1990	17 days
1991	20 days
1992	15 days
1993	20 days
1994	21 days
1995	24 days
1996	20 days
1997	29 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

108 years, 1889 to 1997

A day with at least 56.0 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 174.3 mm (6.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Swellendam (Tnk): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	56.0 mm (2.2 in)
5 years	78.4 mm (3.1 in)
10 years	96.3 mm (3.8 in)
25 years	123.3 mm (4.9 in)
50 years	147.1 mm (5.8 in)
100 years	174.3 mm (6.9 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 108 years of values from 1889 to 1997.

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: 178.5 mm (7.0 in) in 1962; 162.6 mm (6.4 in) in 1902; 161.8 mm (6.4 in) in 1921.

Download the Data

Data for Swellendam (Tnk) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Swellendam (Tnk) 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 2026-10-16 (16 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