Groot Constantia Weather Records (SF000047220)

Record envelope, standing records and threshold days for Groot Constantia (SF000047220), South Africa, with 102 years of record.

Key Facts for Groot Constantia

Groot Constantia (SF000047220) is a weather station in South Africa at -34.03 latitude and 18.42 longitude, 100 m (328 ft) above sea level.
The station reports from 1888 to 1989, 102 years of record.
0 records set at Groot Constantia still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Groot Constantia set a daily record precipitation of 35.0 mm (1.4 in) on 15 August 1989.

About the Station

Location: South Africa, -34.03 latitude, 18.42 longitude.
Elevation: 100 m (328 ft).
Period of record: 1888 to 1989, 102 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 Groot Constantia. 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 Groot Constantia, 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 Groot Constantia still stand.

Wettest Day of Each Month

Sep: 104.6 mm (4.1 in)

The wettest day on record for each calendar month at Groot Constantia. The most was 104.6 mm (4.1 in) on 30 September 1914.

Record daily precipitation for each month at Groot Constantia
Month	Record daily precipitation (mm)	Date
Jan	62.7 mm (2.5 in)	21 January 1914
Feb	62.0 mm (2.4 in)	18 February 1955
Mar	70.4 mm (2.8 in)	27 March 1910
Apr	81.0 mm (3.2 in)	19 April 1953
May	82.0 mm (3.2 in)	13 May 1987
Jun	83.2 mm (3.3 in)	11 June 1974
Jul	85.6 mm (3.4 in)	30 July 1945
Aug	94.7 mm (3.7 in)	9 August 1948
Sep	104.6 mm (4.1 in)	30 September 1914
Oct	89.0 mm (3.5 in)	7 October 1962
Nov	77.4 mm (3.0 in)	23 November 1976
Dec	43.1 mm (1.7 in)	30 December 1976

Latest Records

Latest records at Groot Constantia
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 August 1989	Groot Constantia, ZA	daily rain	35.0 mm (1.4 in)	1.0 mm (0.04 in)	31 years	19 of 100 (Routine)
10 May 1989	Groot Constantia, ZA	daily rain	76.0 mm (3.0 in)	33.0 mm (1.3 in)	30 years	42 of 100 (Notable)
21 April 1989	Groot Constantia, ZA	daily rain	52.4 mm (2.1 in)	5.7 mm (0.22 in)	20 years	20 of 100 (Routine)
29 March 1989	Groot Constantia, ZA	daily rain	31.4 mm (1.2 in)	18.7 mm (0.7 in)	58 years	46 of 100 (Notable)
28 February 1989	Groot Constantia, ZA	daily rain	35.2 mm (1.4 in)	8.7 mm (0.34 in)	10 years	22 of 100 (Routine)
24 February 1989	Groot Constantia, ZA	daily rain	23.0 mm (0.9 in)	1.4 mm (0.06 in)	50 years	20 of 100 (Routine)
30 August 1988	Groot Constantia, ZA	daily rain	49.4 mm (1.9 in)	0.4 mm (0.02 in)	30 years	19 of 100 (Routine)
7 March 1988	Groot Constantia, ZA	daily rain	14.0 mm (0.6 in)	1.3 mm (0.05 in)	57 years	20 of 100 (Routine)
9 December 1987	Groot Constantia, ZA	daily rain	23.0 mm (0.9 in)	16.4 mm (0.6 in)	72 years	20 of 100 (Routine)
23 September 1987	Groot Constantia, ZA	daily rain	30.5 mm (1.2 in)	2.5 mm (0.10 in)	24 years	19 of 100 (Routine)
18 July 1987	Groot Constantia, ZA	daily rain	85.0 mm (3.3 in)	16.4 mm (0.6 in)	42 years	33 of 100 (Routine)
13 May 1987	Groot Constantia, ZA	monthly rain	82.0 mm (3.2 in)	4.0 mm (0.16 in)	45 years	35 of 100 (Notable)
14 March 1987	Groot Constantia, ZA	daily rain	13.6 mm (0.5 in)	2.6 mm (0.10 in)	32 years	20 of 100 (Routine)
22 February 1987	Groot Constantia, ZA	daily rain	9.0 mm (0.35 in)	4.4 mm (0.17 in)	75 years	20 of 100 (Routine)
26 December 1982	Groot Constantia, ZA	daily rain	25.5 mm (1.0 in)	1.4 mm (0.06 in)	72 years	31 of 100 (Routine)
8 November 1982	Groot Constantia, ZA	daily rain	26.3 mm (1.0 in)	8.3 mm (0.33 in)	28 years	25 of 100 (Routine)
15 June 1982	Groot Constantia, ZA	daily rain (Tie)	52.0 mm (2.0 in)	tie	17 years	3 of 100 (Routine)
19 March 1982	Groot Constantia, ZA	daily rain	11.3 mm (0.4 in)	4.3 mm (0.17 in)	24 years	20 of 100 (Routine)
14 January 1982	Groot Constantia, ZA	daily rain	13.1 mm (0.5 in)	4.0 mm (0.16 in)	51 years	20 of 100 (Routine)
7 September 1981	Groot Constantia, ZA	daily rain	51.6 mm (2.0 in)	25.6 mm (1.0 in)	19 years	36 of 100 (Notable)

Extremes by Year

1888 to 1989

Yearly extremes at Groot Constantia: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	104.6 mm (4.1 in)	1914	61.8 mm (2.4 in)	75
Wettest five days (Rx5day)	227.2 mm (8.9 in)	1977	119.2 mm (4.7 in)	75
Longest dry spell (CDD)	80 days	1953	27 days	75

Wettest day (Rx1day)

The wettest day of the year at Groot Constantia, 1888 to 1989. The record is 104.6 mm (4.1 in) in 1914, marked on the chart; the median year is 61.8 mm (2.4 in).

Wettest day (Rx1day) at Groot Constantia by year
Year	Wettest day (Rx1day)
1888	19.3 mm (0.8 in)
1889	62.5 mm (2.5 in)
1899	63.5 mm (2.5 in)
1900	64.8 mm (2.6 in)
1909	94.2 mm (3.7 in)
1910	77.2 mm (3.0 in)
1911	71.1 mm (2.8 in)
1912	58.2 mm (2.3 in)
1913	87.4 mm (3.4 in)
1914	104.6 mm (4.1 in)
1915	63.5 mm (2.5 in)
1916	44.5 mm (1.8 in)
1917	24.6 mm (1.0 in)
1924	31.7 mm (1.2 in)
1925	26.2 mm (1.0 in)
1926	53.1 mm (2.1 in)
1927	29.2 mm (1.1 in)
1928	40.6 mm (1.6 in)
1929	38.1 mm (1.5 in)
1930	44.5 mm (1.8 in)
1931	54.6 mm (2.1 in)
1932	35.6 mm (1.4 in)
1933	24.9 mm (1.0 in)
1934	58.2 mm (2.3 in)
1935	27.2 mm (1.1 in)
1936	31.0 mm (1.2 in)
1937	23.9 mm (0.9 in)
1938	43.7 mm (1.7 in)
1939	52.1 mm (2.1 in)
1940	62.2 mm (2.4 in)
1941	85.1 mm (3.4 in)
1942	61.0 mm (2.4 in)
1943	42.7 mm (1.7 in)
1944	68.6 mm (2.7 in)
1945	85.6 mm (3.4 in)
1946	38.9 mm (1.5 in)
1947	62.2 mm (2.4 in)
1948	94.7 mm (3.7 in)
1949	57.4 mm (2.3 in)
1950	74.7 mm (2.9 in)
1951	65.0 mm (2.6 in)
1952	82.6 mm (3.3 in)
1953	81.0 mm (3.2 in)
1954	75.0 mm (3.0 in)
1955	67.5 mm (2.7 in)
1956	61.0 mm (2.4 in)
1957	61.8 mm (2.4 in)
1958	76.0 mm (3.0 in)
1959	53.0 mm (2.1 in)
1960	81.5 mm (3.2 in)
1961	55.5 mm (2.2 in)
1962	89.0 mm (3.5 in)
1963	90.0 mm (3.5 in)
1964	53.0 mm (2.1 in)
1965	63.5 mm (2.5 in)
1966	89.5 mm (3.5 in)
1967	55.6 mm (2.2 in)
1968	75.2 mm (3.0 in)
1969	46.7 mm (1.8 in)
1970	49.8 mm (2.0 in)
1971	77.2 mm (3.0 in)
1972	38.3 mm (1.5 in)
1973	56.2 mm (2.2 in)
1974	83.5 mm (3.3 in)
1975	78.8 mm (3.1 in)
1976	77.4 mm (3.0 in)
1977	88.6 mm (3.5 in)
1978	60.5 mm (2.4 in)
1979	58.4 mm (2.3 in)
1980	62.2 mm (2.4 in)
1981	66.4 mm (2.6 in)
1982	52.0 mm (2.0 in)
1987	85.0 mm (3.3 in)
1988	51.5 mm (2.0 in)
1989	76.0 mm (3.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Groot Constantia, 1888 to 1989. The record is 227.2 mm (8.9 in) in 1977, marked on the chart; the median year is 119.2 mm (4.7 in).

Wettest five days (Rx5day) at Groot Constantia by year
Year	Wettest five days (Rx5day)
1888	45.3 mm (1.8 in)
1889	109.5 mm (4.3 in)
1899	135.6 mm (5.3 in)
1900	72.7 mm (2.9 in)
1909	218.1 mm (8.6 in)
1910	127.0 mm (5.0 in)
1911	92.7 mm (3.6 in)
1912	82.1 mm (3.2 in)
1913	138.7 mm (5.5 in)
1914	138.8 mm (5.5 in)
1915	163.6 mm (6.4 in)
1916	99.9 mm (3.9 in)
1917	28.7 mm (1.1 in)
1924	54.7 mm (2.2 in)
1925	55.4 mm (2.2 in)
1926	119.2 mm (4.7 in)
1927	57.4 mm (2.3 in)
1928	86.8 mm (3.4 in)
1929	56.1 mm (2.2 in)
1930	49.8 mm (2.0 in)
1931	83.0 mm (3.3 in)
1932	62.3 mm (2.5 in)
1933	39.6 mm (1.6 in)
1934	90.7 mm (3.6 in)
1935	60.2 mm (2.4 in)
1936	74.2 mm (2.9 in)
1937	29.3 mm (1.2 in)
1938	75.2 mm (3.0 in)
1939	104.2 mm (4.1 in)
1940	123.9 mm (4.9 in)
1941	182.3 mm (7.2 in)
1942	158.3 mm (6.2 in)
1943	70.0 mm (2.8 in)
1944	77.2 mm (3.0 in)
1945	131.3 mm (5.2 in)
1946	55.9 mm (2.2 in)
1947	110.2 mm (4.3 in)
1948	170.1 mm (6.7 in)
1949	160.8 mm (6.3 in)
1950	156.5 mm (6.2 in)
1951	128.1 mm (5.0 in)
1952	141.5 mm (5.6 in)
1953	148.5 mm (5.8 in)
1954	202.5 mm (8.0 in)
1955	136.0 mm (5.4 in)
1956	157.5 mm (6.2 in)
1957	155.2 mm (6.1 in)
1958	106.0 mm (4.2 in)
1959	122.4 mm (4.8 in)
1960	200.0 mm (7.9 in)
1961	174.7 mm (6.9 in)
1962	130.0 mm (5.1 in)
1963	147.8 mm (5.8 in)
1964	90.7 mm (3.6 in)
1965	127.0 mm (5.0 in)
1966	147.0 mm (5.8 in)
1967	150.7 mm (5.9 in)
1968	123.2 mm (4.9 in)
1969	95.8 mm (3.8 in)
1970	89.8 mm (3.5 in)
1971	149.1 mm (5.9 in)
1972	73.9 mm (2.9 in)
1973	97.5 mm (3.8 in)
1974	193.4 mm (7.6 in)
1975	147.9 mm (5.8 in)
1976	149.8 mm (5.9 in)
1977	227.2 mm (8.9 in)
1978	95.4 mm (3.8 in)
1979	122.9 mm (4.8 in)
1980	111.9 mm (4.4 in)
1981	85.9 mm (3.4 in)
1982	68.9 mm (2.7 in)
1987	130.8 mm (5.1 in)
1988	139.7 mm (5.5 in)
1989	104.7 mm (4.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Groot Constantia, 1888 to 1989. The record is 80 days in 1953, marked on the chart; the median year is 27 days.

Longest dry spell (CDD) at Groot Constantia by year
Year	Longest dry spell (CDD)
1888	8 days
1889	32 days
1899	18 days
1900	18 days
1909	16 days
1910	37 days
1911	26 days
1912	33 days
1913	24 days
1914	30 days
1915	62 days
1916	28 days
1917	44 days
1924	39 days
1925	16 days
1926	21 days
1927	17 days
1928	30 days
1929	28 days
1930	37 days
1931	20 days
1932	17 days
1933	32 days
1934	43 days
1935	22 days
1936	21 days
1937	26 days
1938	33 days
1939	41 days
1940	18 days
1941	21 days
1942	33 days
1943	27 days
1944	31 days
1945	59 days
1946	19 days
1947	34 days
1948	12 days
1949	24 days
1950	19 days
1951	25 days
1952	19 days
1953	80 days
1954	21 days
1955	47 days
1956	46 days
1957	15 days
1958	25 days
1959	17 days
1960	31 days
1961	42 days
1962	30 days
1963	27 days
1964	21 days
1965	21 days
1966	21 days
1967	37 days
1968	41 days
1969	19 days
1970	23 days
1971	44 days
1972	42 days
1973	23 days
1974	43 days
1975	25 days
1976	39 days
1977	25 days
1978	33 days
1979	26 days
1980	31 days
1981	34 days
1982	31 days
1987	25 days
1988	46 days
1989	20 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

62 years, 1910 to 1988

A day with at least 63.6 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 102.8 mm (4.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Groot Constantia: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	63.6 mm (2.5 in)
5 years	79.9 mm (3.1 in)
10 years	87.8 mm (3.5 in)
25 years	95.3 mm (3.8 in)
50 years	99.5 mm (3.9 in)
100 years	102.8 mm (4.0 in)	Longer than the 62 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, 62 years of values from 1910 to 1988.

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: 104.6 mm (4.1 in) in 1914; 94.7 mm (3.7 in) in 1948; 90.0 mm (3.5 in) in 1963.

Download the Data

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