Grootdam Weather Records (SF001215980)

Record envelope, standing records and threshold days for Grootdam (SF001215980), South Africa, with 84 years of record.

Key Facts for Grootdam

Grootdam (SF001215980) is a weather station in South Africa at -31.97 latitude and 25.83 longitude, 1,195 m (3,921 ft) above sea level.
The station reports from 1914 to 1997, 84 years of record.
0 records set at Grootdam still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Grootdam set a monthly record daily precipitation of 75.0 mm (3.0 in) on 1 November 1997.

About the Station

Location: South Africa, -31.97 latitude, 25.83 longitude.
Elevation: 1,195 m (3,921 ft).
Period of record: 1914 to 1997, 84 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 Grootdam. 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 Grootdam, 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 Grootdam still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Grootdam between 22 October 1968 and 22 October 1968. Each dot is a new record.

Wettest Day of Each Month

Oct: 81.3 mm (3.2 in)

The wettest day on record for each calendar month at Grootdam. The most was 81.3 mm (3.2 in) on 22 October 1968.

Record daily precipitation for each month at Grootdam
Month	Record daily precipitation (mm)	Date
Jan	64.0 mm (2.5 in)	25 January 1976
Feb	49.5 mm (1.9 in)	1 February 1964
Mar	68.6 mm (2.7 in)	2 March 1925
Apr	36.8 mm (1.4 in)	5 April 1941
May	48.3 mm (1.9 in)	27 May 1944
Jun	34.5 mm (1.4 in)	17 June 1964
Jul	72.0 mm (2.8 in)	25 July 1983
Aug	62.0 mm (2.4 in)	26 August 1970
Sep	40.9 mm (1.6 in)	13 September 1953
Oct	81.3 mm (3.2 in)	22 October 1968
Nov	75.0 mm (3.0 in)	1 November 1997
Dec	68.6 mm (2.7 in)	6 December 1937

Latest Records

Latest records at Grootdam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 November 1997	Grootdam, ZA	monthly rain	75.0 mm (3.0 in)	18.7 mm (0.7 in)	40 years	50 of 100 (Notable)
9 June 1997	Grootdam, ZA	daily rain	7.5 mm (0.30 in)	1.0 mm (0.04 in)	36 years	19 of 100 (Routine)
25 May 1997	Grootdam, ZA	daily rain	31.5 mm (1.2 in)	20.1 mm (0.8 in)	54 years	49 of 100 (Notable)
18 January 1997	Grootdam, ZA	daily rain	32.0 mm (1.3 in)	11.4 mm (0.4 in)	35 years	29 of 100 (Routine)
7 January 1997	Grootdam, ZA	daily rain	29.0 mm (1.1 in)	8.4 mm (0.33 in)	40 years	28 of 100 (Routine)
27 December 1996	Grootdam, ZA	daily rain	35.5 mm (1.4 in)	4.8 mm (0.19 in)	62 years	30 of 100 (Routine)
16 November 1996	Grootdam, ZA	daily rain	35.0 mm (1.4 in)	15.5 mm (0.6 in)	31 years	33 of 100 (Routine)
7 November 1996	Grootdam, ZA	daily rain	32.0 mm (1.3 in)	16.0 mm (0.6 in)	10 years	28 of 100 (Routine)
4 August 1996	Grootdam, ZA	daily rain	26.0 mm (1.0 in)	22.7 mm (0.9 in)	51 years	46 of 100 (Notable)
22 January 1996	Grootdam, ZA	daily rain	40.0 mm (1.6 in)	12.1 mm (0.5 in)	58 years	37 of 100 (Notable)
29 November 1995	Grootdam, ZA	daily rain	34.0 mm (1.3 in)	0.7 mm (0.03 in)	44 years	21 of 100 (Routine)
3 February 1994	Grootdam, ZA	daily rain	21.6 mm (0.9 in)	1.2 mm (0.05 in)	18 years	14 of 100 (Routine)
26 October 1993	Grootdam, ZA	daily rain	25.0 mm (1.0 in)	0.1 mm (0.00 in)	42 years	20 of 100 (Routine)
8 August 1992	Grootdam, ZA	daily rain	15.0 mm (0.6 in)	4.3 mm (0.17 in)	42 years	20 of 100 (Routine)
24 June 1992	Grootdam, ZA	daily rain	2.5 mm (0.10 in)	0.5 mm (0.02 in)	22 years	13 of 100 (Routine)
11 June 1992	Grootdam, ZA	daily rain	28.0 mm (1.1 in)	15.5 mm (0.6 in)	18 years	35 of 100 (Notable)
27 February 1992	Grootdam, ZA	daily rain	27.5 mm (1.1 in)	2.5 mm (0.10 in)	16 years	13 of 100 (Routine)
9 November 1991	Grootdam, ZA	daily rain	42.5 mm (1.7 in)	18.4 mm (0.7 in)	48 years	41 of 100 (Notable)
20 October 1991	Grootdam, ZA	daily rain	18.0 mm (0.7 in)	3.8 mm (0.15 in)	32 years	19 of 100 (Routine)
6 June 1991	Grootdam, ZA	daily rain	12.5 mm (0.5 in)	3.9 mm (0.15 in)	60 years	20 of 100 (Routine)

Extremes by Year

1914 to 1997

Yearly extremes at Grootdam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	81.3 mm (3.2 in)	1968	36.8 mm (1.4 in)	79
Wettest five days (Rx5day)	135.0 mm (5.3 in)	1974	53.5 mm (2.1 in)	79
Longest dry spell (CDD)	173 days	1921	66 days	79

Wettest day (Rx1day)

The wettest day of the year at Grootdam, 1914 to 1997. The record is 81.3 mm (3.2 in) in 1968, marked on the chart; the median year is 36.8 mm (1.4 in).

Wettest day (Rx1day) at Grootdam by year
Year	Wettest day (Rx1day)
1914	18.3 mm (0.7 in)
1915	15.2 mm (0.6 in)
1916	40.6 mm (1.6 in)
1917	38.1 mm (1.5 in)
1918	64.0 mm (2.5 in)
1919	34.0 mm (1.3 in)
1920	55.4 mm (2.2 in)
1921	32.5 mm (1.3 in)
1922	10.2 mm (0.4 in)
1925	68.6 mm (2.7 in)
1926	30.5 mm (1.2 in)
1930	27.9 mm (1.1 in)
1931	25.4 mm (1.0 in)
1932	37.3 mm (1.5 in)
1933	22.9 mm (0.9 in)
1934	40.6 mm (1.6 in)
1935	27.9 mm (1.1 in)
1936	22.9 mm (0.9 in)
1937	68.6 mm (2.7 in)
1938	32.5 mm (1.3 in)
1939	30.0 mm (1.2 in)
1940	41.9 mm (1.6 in)
1941	36.8 mm (1.4 in)
1942	50.8 mm (2.0 in)
1943	47.0 mm (1.9 in)
1944	50.8 mm (2.0 in)
1945	30.5 mm (1.2 in)
1946	31.8 mm (1.3 in)
1947	22.9 mm (0.9 in)
1948	25.4 mm (1.0 in)
1949	34.0 mm (1.3 in)
1950	47.2 mm (1.9 in)
1951	31.8 mm (1.3 in)
1952	33.8 mm (1.3 in)
1953	54.5 mm (2.1 in)
1954	30.0 mm (1.2 in)
1955	41.5 mm (1.6 in)
1956	56.3 mm (2.2 in)
1957	34.8 mm (1.4 in)
1958	28.5 mm (1.1 in)
1959	36.8 mm (1.4 in)
1960	39.5 mm (1.6 in)
1961	28.0 mm (1.1 in)
1962	31.5 mm (1.2 in)
1963	38.0 mm (1.5 in)
1964	49.5 mm (1.9 in)
1965	55.5 mm (2.2 in)
1966	43.5 mm (1.7 in)
1967	37.0 mm (1.5 in)
1968	81.3 mm (3.2 in)
1969	22.5 mm (0.9 in)
1970	62.0 mm (2.4 in)
1971	26.5 mm (1.0 in)
1972	33.5 mm (1.3 in)
1973	45.0 mm (1.8 in)
1974	61.0 mm (2.4 in)
1975	36.0 mm (1.4 in)
1976	64.0 mm (2.5 in)
1977	27.0 mm (1.1 in)
1978	38.0 mm (1.5 in)
1979	35.5 mm (1.4 in)
1980	49.5 mm (1.9 in)
1981	55.5 mm (2.2 in)
1982	26.0 mm (1.0 in)
1983	72.0 mm (2.8 in)
1984	36.0 mm (1.4 in)
1985	42.5 mm (1.7 in)
1986	43.5 mm (1.7 in)
1987	37.5 mm (1.5 in)
1988	45.5 mm (1.8 in)
1989	51.8 mm (2.0 in)
1990	32.3 mm (1.3 in)
1991	42.5 mm (1.7 in)
1992	28.0 mm (1.1 in)
1993	25.0 mm (1.0 in)
1994	35.5 mm (1.4 in)
1995	34.0 mm (1.3 in)
1996	40.0 mm (1.6 in)
1997	75.0 mm (3.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grootdam, 1914 to 1997. The record is 135.0 mm (5.3 in) in 1974, marked on the chart; the median year is 53.5 mm (2.1 in).

Wettest five days (Rx5day) at Grootdam by year
Year	Wettest five days (Rx5day)
1914	28.7 mm (1.1 in)
1915	21.4 mm (0.8 in)
1916	44.2 mm (1.7 in)
1917	48.5 mm (1.9 in)
1918	64.2 mm (2.5 in)
1919	36.3 mm (1.4 in)
1920	61.0 mm (2.4 in)
1921	43.6 mm (1.7 in)
1922	19.3 mm (0.8 in)
1925	81.8 mm (3.2 in)
1926	38.1 mm (1.5 in)
1930	27.9 mm (1.1 in)
1931	52.2 mm (2.1 in)
1932	89.5 mm (3.5 in)
1933	45.7 mm (1.8 in)
1934	76.7 mm (3.0 in)
1935	43.4 mm (1.7 in)
1936	22.9 mm (0.9 in)
1937	68.6 mm (2.7 in)
1938	46.5 mm (1.8 in)
1939	45.8 mm (1.8 in)
1940	52.8 mm (2.1 in)
1941	52.2 mm (2.1 in)
1942	61.0 mm (2.4 in)
1943	63.4 mm (2.5 in)
1944	101.7 mm (4.0 in)
1945	35.6 mm (1.4 in)
1946	55.9 mm (2.2 in)
1947	32.3 mm (1.3 in)
1948	53.3 mm (2.1 in)
1949	34.0 mm (1.3 in)
1950	79.0 mm (3.1 in)
1951	65.8 mm (2.6 in)
1952	69.3 mm (2.7 in)
1953	71.5 mm (2.8 in)
1954	63.1 mm (2.5 in)
1955	61.6 mm (2.4 in)
1956	97.8 mm (3.9 in)
1957	48.7 mm (1.9 in)
1958	55.0 mm (2.2 in)
1959	55.0 mm (2.2 in)
1960	42.0 mm (1.7 in)
1961	39.5 mm (1.6 in)
1962	38.5 mm (1.5 in)
1963	106.8 mm (4.2 in)
1964	49.5 mm (1.9 in)
1965	75.0 mm (3.0 in)
1966	56.0 mm (2.2 in)
1967	60.5 mm (2.4 in)
1968	81.3 mm (3.2 in)
1969	54.8 mm (2.2 in)
1970	96.4 mm (3.8 in)
1971	41.5 mm (1.6 in)
1972	46.0 mm (1.8 in)
1973	56.6 mm (2.2 in)
1974	135.0 mm (5.3 in)
1975	54.0 mm (2.1 in)
1976	77.7 mm (3.1 in)
1977	51.8 mm (2.0 in)
1978	50.5 mm (2.0 in)
1979	53.5 mm (2.1 in)
1980	49.5 mm (1.9 in)
1981	110.5 mm (4.4 in)
1982	37.5 mm (1.5 in)
1983	107.0 mm (4.2 in)
1984	39.5 mm (1.6 in)
1985	97.0 mm (3.8 in)
1986	55.5 mm (2.2 in)
1987	67.5 mm (2.7 in)
1988	69.5 mm (2.7 in)
1989	70.0 mm (2.8 in)
1990	49.9 mm (2.0 in)
1991	53.5 mm (2.1 in)
1992	28.0 mm (1.1 in)
1993	29.5 mm (1.2 in)
1994	51.0 mm (2.0 in)
1995	34.0 mm (1.3 in)
1996	81.6 mm (3.2 in)
1997	75.0 mm (3.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grootdam, 1914 to 1997. The record is 173 days in 1921, marked on the chart; the median year is 66 days.

Longest dry spell (CDD) at Grootdam by year
Year	Longest dry spell (CDD)
1914	108 days
1915	127 days
1916	66 days
1917	63 days
1918	115 days
1919	148 days
1920	133 days
1921	173 days
1922	21 days
1925	54 days
1926	95 days
1930	74 days
1931	86 days
1932	58 days
1933	105 days
1934	141 days
1935	156 days
1936	45 days
1937	146 days
1938	108 days
1939	97 days
1940	149 days
1941	70 days
1942	114 days
1943	39 days
1944	65 days
1945	59 days
1946	68 days
1947	41 days
1948	91 days
1949	103 days
1950	48 days
1951	92 days
1952	62 days
1953	76 days
1954	112 days
1955	53 days
1956	116 days
1957	48 days
1958	104 days
1959	52 days
1960	85 days
1961	54 days
1962	59 days
1963	70 days
1964	54 days
1965	42 days
1966	117 days
1967	50 days
1968	67 days
1969	57 days
1970	58 days
1971	32 days
1972	70 days
1973	62 days
1974	66 days
1975	67 days
1976	60 days
1977	92 days
1978	41 days
1979	41 days
1980	43 days
1981	44 days
1982	37 days
1983	45 days
1984	56 days
1985	81 days
1986	67 days
1987	39 days
1988	60 days
1989	47 days
1990	52 days
1991	46 days
1992	82 days
1993	44 days
1994	84 days
1995	118 days
1996	77 days
1997	57 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

76 years, 1915 to 1997

A day with at least 37.7 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 88.4 mm (3.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Grootdam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	37.7 mm (1.5 in)
5 years	50.1 mm (2.0 in)
10 years	58.8 mm (2.3 in)
25 years	70.3 mm (2.8 in)
50 years	79.2 mm (3.1 in)
100 years	88.4 mm (3.5 in)	Longer than the 76 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, 76 years of values from 1915 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: 81.3 mm (3.2 in) in 1968; 75.0 mm (3.0 in) in 1997; 72.0 mm (2.8 in) in 1983.

Download the Data

Data for Grootdam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grootdam 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