Swellendam (Bos) Weather Records (SF000087510)

Record envelope, standing records and threshold days for Swellendam (Bos) (SF000087510), South Africa, with 68 years of record.

Key Facts for Swellendam (Bos)

Swellendam (Bos) (SF000087510) is a weather station in South Africa at -34.00 latitude and 20.43 longitude, 250 m (820 ft) above sea level.
The station reports from 1930 to 1997, 68 years of record.
0 records set at Swellendam (Bos) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Swellendam (Bos) set a daily record precipitation of 53.5 mm (2.1 in) on 25 October 1997.

About the Station

Location: South Africa, -34.00 latitude, 20.43 longitude.
Elevation: 250 m (820 ft).
Period of record: 1930 to 1997, 68 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 (Bos). 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 (Bos), 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 (Bos) still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Swellendam (Bos) between 19 August 1962 and 19 August 1962. Each dot is a new record.

Wettest Day of Each Month

Aug: 192.0 mm (7.6 in)

The wettest day on record for each calendar month at Swellendam (Bos). The most was 192.0 mm (7.6 in) on 19 August 1962.

Record daily precipitation for each month at Swellendam (Bos)
Month	Record daily precipitation (mm)	Date
Jan	132.0 mm (5.2 in)	31 January 1964
Feb	91.0 mm (3.6 in)	18 February 1977
Mar	78.7 mm (3.1 in)	3 March 1982
Apr	122.5 mm (4.8 in)	4 April 1971
May	125.0 mm (4.9 in)	14 May 1963
Jun	58.5 mm (2.3 in)	30 June 1973
Jul	57.8 mm (2.3 in)	22 July 1992
Aug	192.0 mm (7.6 in)	19 August 1962
Sep	61.2 mm (2.4 in)	30 September 1951
Oct	117.0 mm (4.6 in)	29 October 1991
Nov	135.6 mm (5.3 in)	12 November 1936
Dec	120.5 mm (4.7 in)	23 December 1994

Latest Records

Latest records at Swellendam (Bos)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 October 1997	Swellendam (Bos), ZA	daily rain	53.5 mm (2.1 in)	35.0 mm (1.4 in)	50 years	46 of 100 (Notable)
6 October 1997	Swellendam (Bos), ZA	daily rain	17.1 mm (0.7 in)	1.9 mm (0.07 in)	63 years	20 of 100 (Routine)
25 August 1997	Swellendam (Bos), ZA	daily rain	45.0 mm (1.8 in)	13.2 mm (0.5 in)	31 years	23 of 100 (Routine)
19 July 1997	Swellendam (Bos), ZA	daily rain	33.5 mm (1.3 in)	1.4 mm (0.06 in)	16 years	11 of 100 (Routine)
25 May 1997	Swellendam (Bos), ZA	daily rain	25.6 mm (1.0 in)	3.0 mm (0.12 in)	35 years	18 of 100 (Routine)
5 April 1997	Swellendam (Bos), ZA	daily rain	29.0 mm (1.1 in)	11.5 mm (0.5 in)	12 years	17 of 100 (Routine)
10 February 1997	Swellendam (Bos), ZA	daily rain	37.2 mm (1.5 in)	13.9 mm (0.5 in)	17 years	20 of 100 (Routine)
21 November 1996	Swellendam (Bos), ZA	daily rain	22.1 mm (0.9 in)	3.1 mm (0.12 in)	21 years	14 of 100 (Routine)
22 October 1996	Swellendam (Bos), ZA	daily rain	52.0 mm (2.0 in)	15.0 mm (0.6 in)	5 years	17 of 100 (Routine)
2 March 1996	Swellendam (Bos), ZA	daily rain	43.5 mm (1.7 in)	23.2 mm (0.9 in)	14 years	27 of 100 (Routine)
26 December 1995	Swellendam (Bos), ZA	daily rain	24.5 mm (1.0 in)	2.5 mm (0.10 in)	14 years	11 of 100 (Routine)
7 December 1995	Swellendam (Bos), ZA	daily rain	69.0 mm (2.7 in)	36.5 mm (1.4 in)	16 years	38 of 100 (Notable)
29 November 1995	Swellendam (Bos), ZA	daily rain	47.5 mm (1.9 in)	1.3 mm (0.05 in)	64 years	25 of 100 (Routine)
23 November 1995	Swellendam (Bos), ZA	daily rain	33.2 mm (1.3 in)	4.0 mm (0.16 in)	52 years	23 of 100 (Routine)
29 September 1995	Swellendam (Bos), ZA	daily rain	17.2 mm (0.7 in)	4.2 mm (0.17 in)	20 years	16 of 100 (Routine)
20 May 1995	Swellendam (Bos), ZA	daily rain	32.0 mm (1.3 in)	0.5 mm (0.02 in)	4 years	7 of 100 (Routine)
5 May 1995	Swellendam (Bos), ZA	daily rain	27.5 mm (1.1 in)	17.0 mm (0.7 in)	20 years	24 of 100 (Routine)
19 April 1995	Swellendam (Bos), ZA	daily rain	62.5 mm (2.5 in)	28.0 mm (1.1 in)	5 years	27 of 100 (Routine)
18 March 1995	Swellendam (Bos), ZA	daily rain	28.0 mm (1.1 in)	1.8 mm (0.07 in)	36 years	18 of 100 (Routine)
17 January 1995	Swellendam (Bos), ZA	daily rain	24.5 mm (1.0 in)	7.7 mm (0.30 in)	64 years	20 of 100 (Routine)

Extremes by Year

1930 to 1997

Yearly extremes at Swellendam (Bos): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	192.0 mm (7.6 in)	1962	61.5 mm (2.4 in)	68
Wettest five days (Rx5day)	400.2 mm (15.8 in)	1962	114.4 mm (4.5 in)	68
Longest dry spell (CDD)	45 days	1953	22 days	68

Wettest day (Rx1day)

The wettest day of the year at Swellendam (Bos), 1930 to 1997. The record is 192.0 mm (7.6 in) in 1962, marked on the chart; the median year is 61.5 mm (2.4 in).

Wettest day (Rx1day) at Swellendam (Bos) by year
Year	Wettest day (Rx1day)
1930	90.9 mm (3.6 in)
1931	99.3 mm (3.9 in)
1932	55.6 mm (2.2 in)
1933	34.0 mm (1.3 in)
1934	84.8 mm (3.3 in)
1935	55.6 mm (2.2 in)
1936	135.6 mm (5.3 in)
1937	49.5 mm (1.9 in)
1938	39.6 mm (1.6 in)
1939	46.5 mm (1.8 in)
1940	81.5 mm (3.2 in)
1941	110.5 mm (4.4 in)
1942	39.6 mm (1.6 in)
1943	71.1 mm (2.8 in)
1944	56.1 mm (2.2 in)
1945	59.2 mm (2.3 in)
1946	54.4 mm (2.1 in)
1947	63.0 mm (2.5 in)
1948	58.2 mm (2.3 in)
1949	55.4 mm (2.2 in)
1950	51.8 mm (2.0 in)
1951	71.9 mm (2.8 in)
1952	37.1 mm (1.5 in)
1953	47.0 mm (1.9 in)
1954	50.0 mm (2.0 in)
1955	106.5 mm (4.2 in)
1956	39.2 mm (1.5 in)
1957	65.0 mm (2.6 in)
1958	86.3 mm (3.4 in)
1959	94.0 mm (3.7 in)
1960	47.0 mm (1.9 in)
1961	47.4 mm (1.9 in)
1962	192.0 mm (7.6 in)
1963	125.0 mm (4.9 in)
1964	132.0 mm (5.2 in)
1965	85.5 mm (3.4 in)
1966	54.5 mm (2.1 in)
1967	76.0 mm (3.0 in)
1968	67.0 mm (2.6 in)
1969	53.5 mm (2.1 in)
1970	82.0 mm (3.2 in)
1971	122.5 mm (4.8 in)
1972	49.0 mm (1.9 in)
1973	58.5 mm (2.3 in)
1974	77.6 mm (3.1 in)
1975	54.3 mm (2.1 in)
1976	43.0 mm (1.7 in)
1977	100.0 mm (3.9 in)
1978	37.0 mm (1.5 in)
1979	91.0 mm (3.6 in)
1980	45.5 mm (1.8 in)
1981	91.8 mm (3.6 in)
1982	78.7 mm (3.1 in)
1983	54.0 mm (2.1 in)
1984	52.0 mm (2.0 in)
1985	77.0 mm (3.0 in)
1986	60.0 mm (2.4 in)
1987	77.5 mm (3.1 in)
1988	84.1 mm (3.3 in)
1989	49.5 mm (1.9 in)
1990	84.2 mm (3.3 in)
1991	117.0 mm (4.6 in)
1992	65.0 mm (2.6 in)
1993	50.8 mm (2.0 in)
1994	120.5 mm (4.7 in)
1995	69.0 mm (2.7 in)
1996	52.0 mm (2.0 in)
1997	53.5 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Swellendam (Bos), 1930 to 1997. The record is 400.2 mm (15.8 in) in 1962, marked on the chart; the median year is 114.4 mm (4.5 in).

Wettest five days (Rx5day) at Swellendam (Bos) by year
Year	Wettest five days (Rx5day)
1930	112.2 mm (4.4 in)
1931	304.8 mm (12.0 in)
1932	305.1 mm (12.0 in)
1933	53.4 mm (2.1 in)
1934	126.8 mm (5.0 in)
1935	62.4 mm (2.5 in)
1936	219.7 mm (8.6 in)
1937	76.2 mm (3.0 in)
1938	80.9 mm (3.2 in)
1939	105.2 mm (4.1 in)
1940	128.5 mm (5.1 in)
1941	132.6 mm (5.2 in)
1942	114.5 mm (4.5 in)
1943	163.7 mm (6.4 in)
1944	67.0 mm (2.6 in)
1945	116.9 mm (4.6 in)
1946	98.1 mm (3.9 in)
1947	114.3 mm (4.5 in)
1948	172.7 mm (6.8 in)
1949	136.7 mm (5.4 in)
1950	63.4 mm (2.5 in)
1951	141.4 mm (5.6 in)
1952	84.0 mm (3.3 in)
1953	94.5 mm (3.7 in)
1954	110.5 mm (4.4 in)
1955	134.5 mm (5.3 in)
1956	69.2 mm (2.7 in)
1957	83.5 mm (3.3 in)
1958	169.2 mm (6.7 in)
1959	94.0 mm (3.7 in)
1960	119.0 mm (4.7 in)
1961	72.6 mm (2.9 in)
1962	400.2 mm (15.8 in)
1963	142.0 mm (5.6 in)
1964	134.5 mm (5.3 in)
1965	151.0 mm (5.9 in)
1966	120.8 mm (4.8 in)
1967	97.7 mm (3.8 in)
1968	94.4 mm (3.7 in)
1969	61.5 mm (2.4 in)
1970	87.7 mm (3.5 in)
1971	159.8 mm (6.3 in)
1972	76.0 mm (3.0 in)
1973	72.5 mm (2.9 in)
1974	160.1 mm (6.3 in)
1975	77.8 mm (3.1 in)
1976	78.0 mm (3.1 in)
1977	146.5 mm (5.8 in)
1978	119.5 mm (4.7 in)
1979	124.0 mm (4.9 in)
1980	87.1 mm (3.4 in)
1981	234.9 mm (9.2 in)
1982	152.5 mm (6.0 in)
1983	78.5 mm (3.1 in)
1984	64.0 mm (2.5 in)
1985	126.5 mm (5.0 in)
1986	208.0 mm (8.2 in)
1987	83.0 mm (3.3 in)
1988	122.6 mm (4.8 in)
1989	191.0 mm (7.5 in)
1990	100.7 mm (4.0 in)
1991	165.9 mm (6.5 in)
1992	104.7 mm (4.1 in)
1993	72.0 mm (2.8 in)
1994	148.5 mm (5.8 in)
1995	90.8 mm (3.6 in)
1996	121.2 mm (4.8 in)
1997	79.5 mm (3.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Swellendam (Bos), 1930 to 1997. The record is 45 days in 1953, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Swellendam (Bos) by year
Year	Longest dry spell (CDD)
1930	20 days
1931	16 days
1932	18 days
1933	30 days
1934	17 days
1935	19 days
1936	33 days
1937	20 days
1938	24 days
1939	37 days
1940	21 days
1941	20 days
1942	18 days
1943	33 days
1944	28 days
1945	20 days
1946	27 days
1947	24 days
1948	35 days
1949	25 days
1950	25 days
1951	41 days
1952	26 days
1953	45 days
1954	21 days
1955	27 days
1956	29 days
1957	24 days
1958	19 days
1959	15 days
1960	15 days
1961	15 days
1962	22 days
1963	20 days
1964	20 days
1965	19 days
1966	24 days
1967	18 days
1968	32 days
1969	24 days
1970	29 days
1971	25 days
1972	28 days
1973	21 days
1974	38 days
1975	21 days
1976	20 days
1977	22 days
1978	22 days
1979	26 days
1980	24 days
1981	22 days
1982	23 days
1983	20 days
1984	26 days
1985	19 days
1986	21 days
1987	17 days
1988	20 days
1989	16 days
1990	14 days
1991	18 days
1992	16 days
1993	19 days
1994	18 days
1995	25 days
1996	25 days
1997	15 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

67 years, 1930 to 1997

A day with at least 64.9 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 183.7 mm (7.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Swellendam (Bos): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	64.9 mm (2.6 in)
5 years	89.7 mm (3.5 in)
10 years	108.6 mm (4.3 in)
25 years	135.8 mm (5.3 in)
50 years	158.6 mm (6.2 in)
100 years	183.7 mm (7.2 in)	Longer than the 67 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 67 years of values from 1930 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: 192.0 mm (7.6 in) in 1962; 135.6 mm (5.3 in) in 1936; 132.0 mm (5.2 in) in 1964.

Download the Data

Data for Swellendam (Bos) standing records by year: CSV or JSON. Field meanings are on the data page.
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 2026-10-15 (15 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