Jonkersdam Weather Records (SF004412610)

Record envelope, standing records and threshold days for Jonkersdam (SF004412610), South Africa, with 81 years of record.

Key Facts for Jonkersdam

Jonkersdam (SF004412610) is a weather station in South Africa at -26.87 latitude and 29.17 longitude, 1,603 m (5,259 ft) above sea level.
The station reports from 1917 to 1997, 81 years of record.
0 records set at Jonkersdam still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Jonkersdam set a daily record precipitation of 60.0 mm (2.4 in) on 29 November 1997.

About the Station

Location: South Africa, -26.87 latitude, 29.17 longitude.
Elevation: 1,603 m (5,259 ft).
Period of record: 1917 to 1997, 81 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 Jonkersdam. 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 Jonkersdam, 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 Jonkersdam still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Jonkersdam between 22 February 1960 and 22 February 1960. Each dot is a new record.

Wettest Day of Each Month

Jan: 100.0 mm (3.9 in)

The wettest day on record for each calendar month at Jonkersdam. The most was 100.0 mm (3.9 in) on 29 January 1974.

Record daily precipitation for each month at Jonkersdam
Month	Record daily precipitation (mm)	Date
Jan	100.0 mm (3.9 in)	29 January 1974
Feb	100.0 mm (3.9 in)	22 February 1960
Mar	83.8 mm (3.3 in)	30 March 1936
Apr	49.0 mm (1.9 in)	8 April 1941
May	58.4 mm (2.3 in)	6 May 1928
Jun	62.7 mm (2.5 in)	14 June 1944
Jul	32.0 mm (1.3 in)	16 July 1970
Aug	60.0 mm (2.4 in)	17 August 1979
Sep	72.0 mm (2.8 in)	27 September 1973
Oct	70.6 mm (2.8 in)	7 October 1937
Nov	71.0 mm (2.8 in)	27 November 1963
Dec	78.2 mm (3.1 in)	18 December 1917

Latest Records

Latest records at Jonkersdam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 November 1997	Jonkersdam, ZA	daily rain	60.0 mm (2.4 in)	26.5 mm (1.0 in)	20 years	38 of 100 (Notable)
25 October 1997	Jonkersdam, ZA	daily rain	52.5 mm (2.1 in)	1.7 mm (0.07 in)	63 years	27 of 100 (Routine)
11 September 1997	Jonkersdam, ZA	daily rain	14.5 mm (0.6 in)	0.3 mm (0.01 in)	72 years	20 of 100 (Routine)
27 July 1997	Jonkersdam, ZA	daily rain	2.5 mm (0.10 in)	2.2 mm (0.09 in)	72 years	20 of 100 (Routine)
12 June 1997	Jonkersdam, ZA	daily rain	29.0 mm (1.1 in)	12.0 mm (0.5 in)	34 years	30 of 100 (Routine)
28 May 1997	Jonkersdam, ZA	daily rain	14.0 mm (0.6 in)	0.3 mm (0.01 in)	76 years	20 of 100 (Routine)
26 May 1997	Jonkersdam, ZA	daily rain	15.0 mm (0.6 in)	7.6 mm (0.30 in)	54 years	20 of 100 (Routine)
25 May 1997	Jonkersdam, ZA	daily rain	45.3 mm (1.8 in)	19.9 mm (0.8 in)	63 years	44 of 100 (Notable)
7 March 1997	Jonkersdam, ZA	daily rain	39.0 mm (1.5 in)	5.5 mm (0.22 in)	48 years	26 of 100 (Routine)
27 February 1997	Jonkersdam, ZA	daily rain	91.5 mm (3.6 in)	77.5 mm (3.1 in)	36 years	58 of 100 (Notable)
22 October 1996	Jonkersdam, ZA	daily rain	42.0 mm (1.7 in)	20.0 mm (0.8 in)	40 years	37 of 100 (Notable)
7 July 1996	Jonkersdam, ZA	daily rain	14.0 mm (0.6 in)	6.9 mm (0.27 in)	58 years	20 of 100 (Routine)
18 April 1996	Jonkersdam, ZA	daily rain	19.0 mm (0.7 in)	3.5 mm (0.14 in)	58 years	20 of 100 (Routine)
11 February 1996	Jonkersdam, ZA	daily rain	53.5 mm (2.1 in)	11.3 mm (0.4 in)	53 years	31 of 100 (Routine)
2 January 1996	Jonkersdam, ZA	daily rain	33.5 mm (1.3 in)	1.7 mm (0.07 in)	44 years	22 of 100 (Routine)
23 December 1995	Jonkersdam, ZA	daily rain	28.5 mm (1.1 in)	10.0 mm (0.4 in)	70 years	36 of 100 (Notable)
28 August 1995	Jonkersdam, ZA	daily rain	20.0 mm (0.8 in)	1.0 mm (0.04 in)	22 years	13 of 100 (Routine)
30 July 1995	Jonkersdam, ZA	daily rain	1.3 mm (0.05 in)	1.3 mm (0.05 in)	76 years	20 of 100 (Routine)
28 July 1995	Jonkersdam, ZA	daily rain	20.0 mm (0.8 in)	14.9 mm (0.6 in)	64 years	20 of 100 (Routine)
26 July 1995	Jonkersdam, ZA	daily rain	3.5 mm (0.14 in)	3.5 mm (0.14 in)	76 years	20 of 100 (Routine)

Extremes by Year

1917 to 1997

Yearly extremes at Jonkersdam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	100.0 mm (3.9 in)	1960	52.7 mm (2.1 in)	80
Wettest five days (Rx5day)	234.5 mm (9.2 in)	1923	88.2 mm (3.5 in)	80
Longest dry spell (CDD)	186 days	1966	92 days	80

Wettest day (Rx1day)

The wettest day of the year at Jonkersdam, 1917 to 1997. The record is 100.0 mm (3.9 in) in 1960, marked on the chart; the median year is 52.7 mm (2.1 in).

Wettest day (Rx1day) at Jonkersdam by year
Year	Wettest day (Rx1day)
1917	78.2 mm (3.1 in)
1918	43.2 mm (1.7 in)
1919	39.4 mm (1.6 in)
1920	58.9 mm (2.3 in)
1921	52.8 mm (2.1 in)
1922	42.9 mm (1.7 in)
1923	74.4 mm (2.9 in)
1924	37.3 mm (1.5 in)
1925	84.3 mm (3.3 in)
1926	41.9 mm (1.6 in)
1928	58.4 mm (2.3 in)
1929	76.2 mm (3.0 in)
1930	40.6 mm (1.6 in)
1931	40.6 mm (1.6 in)
1932	34.3 mm (1.4 in)
1933	56.4 mm (2.2 in)
1934	62.0 mm (2.4 in)
1935	32.5 mm (1.3 in)
1936	83.8 mm (3.3 in)
1937	74.2 mm (2.9 in)
1938	57.2 mm (2.3 in)
1939	66.5 mm (2.6 in)
1940	64.8 mm (2.6 in)
1941	49.0 mm (1.9 in)
1942	42.2 mm (1.7 in)
1943	31.0 mm (1.2 in)
1944	62.7 mm (2.5 in)
1945	88.9 mm (3.5 in)
1946	74.4 mm (2.9 in)
1947	43.2 mm (1.7 in)
1948	53.6 mm (2.1 in)
1949	53.6 mm (2.1 in)
1950	41.9 mm (1.6 in)
1951	57.2 mm (2.3 in)
1952	41.4 mm (1.6 in)
1953	61.7 mm (2.4 in)
1954	57.0 mm (2.2 in)
1955	61.0 mm (2.4 in)
1956	56.0 mm (2.2 in)
1957	50.0 mm (2.0 in)
1958	60.0 mm (2.4 in)
1959	52.5 mm (2.1 in)
1960	100.0 mm (3.9 in)
1961	85.0 mm (3.3 in)
1962	42.0 mm (1.7 in)
1963	71.0 mm (2.8 in)
1964	36.0 mm (1.4 in)
1965	46.0 mm (1.8 in)
1966	37.0 mm (1.5 in)
1967	36.0 mm (1.4 in)
1968	32.0 mm (1.3 in)
1969	64.0 mm (2.5 in)
1970	32.0 mm (1.3 in)
1971	29.5 mm (1.2 in)
1972	44.0 mm (1.7 in)
1973	72.0 mm (2.8 in)
1974	100.0 mm (3.9 in)
1975	87.0 mm (3.4 in)
1976	60.0 mm (2.4 in)
1977	57.0 mm (2.2 in)
1978	41.0 mm (1.6 in)
1979	60.0 mm (2.4 in)
1980	33.0 mm (1.3 in)
1981	73.0 mm (2.9 in)
1982	24.2 mm (1.0 in)
1983	32.5 mm (1.3 in)
1984	28.5 mm (1.1 in)
1985	50.5 mm (2.0 in)
1986	41.0 mm (1.6 in)
1987	51.5 mm (2.0 in)
1988	34.5 mm (1.4 in)
1989	78.5 mm (3.1 in)
1990	40.0 mm (1.6 in)
1991	38.0 mm (1.5 in)
1992	91.0 mm (3.6 in)
1993	48.5 mm (1.9 in)
1994	49.0 mm (1.9 in)
1995	39.5 mm (1.6 in)
1996	53.5 mm (2.1 in)
1997	91.5 mm (3.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Jonkersdam, 1917 to 1997. The record is 234.5 mm (9.2 in) in 1923, marked on the chart; the median year is 88.2 mm (3.5 in).

Wettest five days (Rx5day) at Jonkersdam by year
Year	Wettest five days (Rx5day)
1917	114.4 mm (4.5 in)
1918	115.0 mm (4.5 in)
1919	78.4 mm (3.1 in)
1920	87.4 mm (3.4 in)
1921	94.9 mm (3.7 in)
1922	81.5 mm (3.2 in)
1923	234.5 mm (9.2 in)
1924	63.7 mm (2.5 in)
1925	106.7 mm (4.2 in)
1926	56.4 mm (2.2 in)
1928	58.4 mm (2.3 in)
1929	91.6 mm (3.6 in)
1930	51.3 mm (2.0 in)
1931	89.9 mm (3.5 in)
1932	45.2 mm (1.8 in)
1933	75.7 mm (3.0 in)
1934	90.9 mm (3.6 in)
1935	60.7 mm (2.4 in)
1936	113.1 mm (4.5 in)
1937	115.6 mm (4.6 in)
1938	86.1 mm (3.4 in)
1939	115.5 mm (4.5 in)
1940	83.8 mm (3.3 in)
1941	63.0 mm (2.5 in)
1942	69.4 mm (2.7 in)
1943	66.6 mm (2.6 in)
1944	134.1 mm (5.3 in)
1945	169.6 mm (6.7 in)
1946	92.4 mm (3.6 in)
1947	90.7 mm (3.6 in)
1948	60.6 mm (2.4 in)
1949	75.5 mm (3.0 in)
1950	63.5 mm (2.5 in)
1951	127.9 mm (5.0 in)
1952	86.6 mm (3.4 in)
1953	132.1 mm (5.2 in)
1954	78.0 mm (3.1 in)
1955	90.0 mm (3.5 in)
1956	103.0 mm (4.1 in)
1957	93.7 mm (3.7 in)
1958	91.0 mm (3.6 in)
1959	111.5 mm (4.4 in)
1960	157.0 mm (6.2 in)
1961	138.0 mm (5.4 in)
1962	61.0 mm (2.4 in)
1963	71.0 mm (2.8 in)
1964	77.0 mm (3.0 in)
1965	66.0 mm (2.6 in)
1966	65.0 mm (2.6 in)
1967	89.0 mm (3.5 in)
1968	54.0 mm (2.1 in)
1969	76.0 mm (3.0 in)
1970	39.0 mm (1.5 in)
1971	73.0 mm (2.9 in)
1972	53.0 mm (2.1 in)
1973	125.0 mm (4.9 in)
1974	110.0 mm (4.3 in)
1975	138.0 mm (5.4 in)
1976	90.0 mm (3.5 in)
1977	90.0 mm (3.5 in)
1978	60.0 mm (2.4 in)
1979	130.5 mm (5.1 in)
1980	69.0 mm (2.7 in)
1981	98.0 mm (3.9 in)
1982	75.0 mm (3.0 in)
1983	94.0 mm (3.7 in)
1984	56.5 mm (2.2 in)
1985	122.5 mm (4.8 in)
1986	50.3 mm (2.0 in)
1987	79.5 mm (3.1 in)
1988	65.4 mm (2.6 in)
1989	133.0 mm (5.2 in)
1990	85.0 mm (3.3 in)
1991	74.0 mm (2.9 in)
1992	104.5 mm (4.1 in)
1993	56.5 mm (2.2 in)
1994	95.5 mm (3.8 in)
1995	127.0 mm (5.0 in)
1996	123.6 mm (4.9 in)
1997	119.0 mm (4.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Jonkersdam, 1917 to 1997. The record is 186 days in 1966, marked on the chart; the median year is 92 days.

Longest dry spell (CDD) at Jonkersdam by year
Year	Longest dry spell (CDD)
1917	10 days
1918	107 days
1919	53 days
1920	101 days
1921	139 days
1922	83 days
1923	46 days
1924	52 days
1925	59 days
1926	54 days
1928	94 days
1929	45 days
1930	28 days
1931	77 days
1932	115 days
1933	17 days
1934	55 days
1935	109 days
1936	108 days
1937	97 days
1938	26 days
1939	46 days
1940	66 days
1941	70 days
1942	144 days
1943	45 days
1944	90 days
1945	134 days
1946	65 days
1947	57 days
1948	124 days
1949	136 days
1950	111 days
1951	71 days
1952	82 days
1953	151 days
1954	136 days
1955	102 days
1956	106 days
1957	51 days
1958	134 days
1959	94 days
1960	69 days
1961	93 days
1962	138 days
1963	98 days
1964	42 days
1965	161 days
1966	186 days
1967	52 days
1968	111 days
1969	129 days
1970	64 days
1971	13 days
1972	151 days
1973	110 days
1974	121 days
1975	122 days
1976	151 days
1977	150 days
1978	145 days
1979	103 days
1980	168 days
1981	88 days
1982	152 days
1983	43 days
1984	63 days
1985	76 days
1986	117 days
1987	73 days
1988	71 days
1989	62 days
1990	90 days
1991	51 days
1992	121 days
1993	115 days
1994	160 days
1995	67 days
1996	60 days
1997	44 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

72 years, 1918 to 1997

A day with at least 53.0 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 112.3 mm (4.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Jonkersdam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	53.0 mm (2.1 in)
5 years	70.1 mm (2.8 in)
10 years	80.9 mm (3.2 in)
25 years	94.0 mm (3.7 in)
50 years	103.3 mm (4.1 in)
100 years	112.3 mm (4.4 in)	Longer than the 72 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, 72 years of values from 1918 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: 100.0 mm (3.9 in) in 1960; 100.0 mm (3.9 in) in 1974; 91.5 mm (3.6 in) in 1997.

Download the Data

Data for Jonkersdam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Jonkersdam 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 2026-10-12 (12 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