Zastron (Tnk) Weather Records (SF002041380)

Record envelope, standing records and threshold days for Zastron (Tnk) (SF002041380), South Africa, with 110 years of record.

Key Facts for Zastron (Tnk)

Zastron (Tnk) (SF002041380) is a weather station in South Africa at -30.30 latitude and 27.08 longitude, 1,661 m (5,449 ft) above sea level.
The station reports from 1888 to 1997, 110 years of record.
0 records set at Zastron (Tnk) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Zastron (Tnk) set a daily record precipitation of 12.5 mm (0.5 in) on 11 June 1997.

About the Station

Location: South Africa, -30.30 latitude, 27.08 longitude.
Elevation: 1,661 m (5,449 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 Zastron (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 Zastron (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 Zastron (Tnk) still stand.

All-Time Record Progression

2 new records

2 all-time records were set at Zastron (Tnk) between 21 January 1974 and 2 December 1976. Each dot is a new record.

When Zastron (Tnk) set new all-time records
Date	Kind	Detail
1974-01-21	Record daily precipitation	Record daily precipitation 105.0 mm (4.1 in)
1976-12-02	Record daily precipitation	Record daily precipitation 108.5 mm (4.3 in)

Wettest Day of Each Month

Dec: 108.5 mm (4.3 in)

The wettest day on record for each calendar month at Zastron (Tnk). The most was 108.5 mm (4.3 in) on 2 December 1976.

Record daily precipitation for each month at Zastron (Tnk)
Month	Record daily precipitation (mm)	Date
Jan	105.0 mm (4.1 in)	21 January 1974
Feb	102.9 mm (4.1 in)	9 February 1909
Mar	99.6 mm (3.9 in)	22 March 1925
Apr	69.9 mm (2.8 in)	9 April 1943
May	85.1 mm (3.4 in)	12 May 1943
Jun	59.9 mm (2.4 in)	13 June 1922
Jul	53.0 mm (2.1 in)	24 July 1983
Aug	49.0 mm (1.9 in)	19 August 1960
Sep	74.0 mm (2.9 in)	14 September 1988
Oct	63.5 mm (2.5 in)	20 October 1991
Nov	87.1 mm (3.4 in)	14 November 1984
Dec	108.5 mm (4.3 in)	2 December 1976

Latest Records

Latest records at Zastron (Tnk)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 June 1997	Zastron (Tnk), ZA	daily rain	12.5 mm (0.5 in)	3.6 mm (0.14 in)	52 years	20 of 100 (Routine)
22 April 1997	Zastron (Tnk), ZA	daily rain	23.0 mm (0.9 in)	6.7 mm (0.26 in)	72 years	20 of 100 (Routine)
7 November 1996	Zastron (Tnk), ZA	daily rain	48.0 mm (1.9 in)	11.5 mm (0.5 in)	22 years	27 of 100 (Routine)
25 July 1996	Zastron (Tnk), ZA	daily rain	28.0 mm (1.1 in)	11.7 mm (0.5 in)	69 years	45 of 100 (Notable)
1 April 1996	Zastron (Tnk), ZA	daily rain	33.5 mm (1.3 in)	4.8 mm (0.19 in)	43 years	27 of 100 (Routine)
4 January 1996	Zastron (Tnk), ZA	monthly rain (Tie)	105.0 mm (4.1 in)	tie	21 years	6 of 100 (Routine)
17 December 1995	Zastron (Tnk), ZA	daily rain	68.5 mm (2.7 in)	23.0 mm (0.9 in)	28 years	35 of 100 (Notable)
21 September 1995	Zastron (Tnk), ZA	daily rain	32.5 mm (1.3 in)	2.0 mm (0.08 in)	88 years	37 of 100 (Notable)
6 May 1995	Zastron (Tnk), ZA	daily rain	22.5 mm (0.9 in)	11.0 mm (0.4 in)	33 years	20 of 100 (Routine)
25 March 1995	Zastron (Tnk), ZA	daily rain	23.5 mm (0.9 in)	6.2 mm (0.24 in)	48 years	20 of 100 (Routine)
28 June 1994	Zastron (Tnk), ZA	daily rain (Tie)	5.0 mm (0.20 in)	tie	4 years	2 of 100 (Routine)
12 January 1994	Zastron (Tnk), ZA	daily rain	21.5 mm (0.8 in)	4.0 mm (0.16 in)	22 years	19 of 100 (Routine)
11 August 1993	Zastron (Tnk), ZA	daily rain	11.5 mm (0.5 in)	2.9 mm (0.11 in)	51 years	20 of 100 (Routine)
10 December 1991	Zastron (Tnk), ZA	daily rain	29.5 mm (1.2 in)	8.4 mm (0.33 in)	48 years	30 of 100 (Routine)
20 October 1991	Zastron (Tnk), ZA	monthly rain	63.5 mm (2.5 in)	3.5 mm (0.14 in)	23 years	30 of 100 (Routine)
14 October 1991	Zastron (Tnk), ZA	daily rain	53.1 mm (2.1 in)	26.6 mm (1.0 in)	26 years	45 of 100 (Notable)
14 February 1991	Zastron (Tnk), ZA	daily rain	45.0 mm (1.8 in)	11.5 mm (0.5 in)	76 years	41 of 100 (Notable)
28 June 1990	Zastron (Tnk), ZA	daily rain	5.0 mm (0.20 in)	5.0 mm (0.20 in)	101 years	20 of 100 (Routine)
9 January 1990	Zastron (Tnk), ZA	daily rain	26.0 mm (1.0 in)	1.1 mm (0.04 in)	84 years	35 of 100 (Notable)
22 June 1989	Zastron (Tnk), ZA	daily rain	9.0 mm (0.35 in)	7.5 mm (0.30 in)	84 years	20 of 100 (Routine)

Extremes by Year

1888 to 1997

Yearly extremes at Zastron (Tnk): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	108.5 mm (4.3 in)	1976	49.4 mm (1.9 in)	94
Wettest five days (Rx5day)	239.0 mm (9.4 in)	1988	81.6 mm (3.2 in)	94
Longest dry spell (CDD)	148 days	1948	50 days	94

Wettest day (Rx1day)

The wettest day of the year at Zastron (Tnk), 1888 to 1997. The record is 108.5 mm (4.3 in) in 1976, marked on the chart; the median year is 49.4 mm (1.9 in).

Wettest day (Rx1day) at Zastron (Tnk) by year
Year	Wettest day (Rx1day)
1888	36.3 mm (1.4 in)
1905	40.4 mm (1.6 in)
1906	38.6 mm (1.5 in)
1907	54.6 mm (2.1 in)
1908	70.1 mm (2.8 in)
1909	102.9 mm (4.1 in)
1910	55.9 mm (2.2 in)
1911	47.0 mm (1.9 in)
1912	33.5 mm (1.3 in)
1913	84.1 mm (3.3 in)
1914	26.4 mm (1.0 in)
1915	33.5 mm (1.3 in)
1916	50.3 mm (2.0 in)
1917	68.6 mm (2.7 in)
1918	38.6 mm (1.5 in)
1919	30.7 mm (1.2 in)
1920	68.8 mm (2.7 in)
1921	60.7 mm (2.4 in)
1922	59.9 mm (2.4 in)
1923	92.7 mm (3.6 in)
1924	41.9 mm (1.6 in)
1925	99.6 mm (3.9 in)
1926	55.4 mm (2.2 in)
1927	62.2 mm (2.4 in)
1928	41.1 mm (1.6 in)
1929	47.2 mm (1.9 in)
1930	38.9 mm (1.5 in)
1931	54.6 mm (2.1 in)
1932	37.1 mm (1.5 in)
1933	48.5 mm (1.9 in)
1934	52.1 mm (2.1 in)
1935	50.3 mm (2.0 in)
1936	52.3 mm (2.1 in)
1937	49.3 mm (1.9 in)
1938	46.5 mm (1.8 in)
1939	41.4 mm (1.6 in)
1940	50.8 mm (2.0 in)
1941	61.5 mm (2.4 in)
1942	39.6 mm (1.6 in)
1943	85.1 mm (3.4 in)
1944	55.9 mm (2.2 in)
1945	33.0 mm (1.3 in)
1946	51.6 mm (2.0 in)
1947	47.0 mm (1.9 in)
1948	42.2 mm (1.7 in)
1949	41.7 mm (1.6 in)
1950	101.6 mm (4.0 in)
1951	40.6 mm (1.6 in)
1952	41.7 mm (1.6 in)
1953	36.8 mm (1.4 in)
1954	40.6 mm (1.6 in)
1955	36.6 mm (1.4 in)
1956	27.4 mm (1.1 in)
1957	33.8 mm (1.3 in)
1958	42.7 mm (1.7 in)
1959	44.0 mm (1.7 in)
1960	62.5 mm (2.5 in)
1961	70.0 mm (2.8 in)
1962	49.5 mm (1.9 in)
1963	61.3 mm (2.4 in)
1964	31.7 mm (1.2 in)
1965	38.0 mm (1.5 in)
1966	51.5 mm (2.0 in)
1967	74.0 mm (2.9 in)
1968	32.5 mm (1.3 in)
1969	43.0 mm (1.7 in)
1970	63.5 mm (2.5 in)
1971	31.0 mm (1.2 in)
1972	47.5 mm (1.9 in)
1973	90.5 mm (3.6 in)
1974	105.0 mm (4.1 in)
1975	64.5 mm (2.5 in)
1976	108.5 mm (4.3 in)
1977	43.7 mm (1.7 in)
1978	65.0 mm (2.6 in)
1979	39.0 mm (1.5 in)
1980	67.0 mm (2.6 in)
1981	51.5 mm (2.0 in)
1982	56.0 mm (2.2 in)
1983	53.0 mm (2.1 in)
1984	87.1 mm (3.4 in)
1985	51.5 mm (2.0 in)
1986	49.5 mm (1.9 in)
1987	42.0 mm (1.7 in)
1988	97.5 mm (3.8 in)
1989	45.0 mm (1.8 in)
1990	26.0 mm (1.0 in)
1991	63.5 mm (2.5 in)
1992	33.0 mm (1.3 in)
1993	21.0 mm (0.8 in)
1994	39.4 mm (1.6 in)
1995	68.5 mm (2.7 in)
1996	105.0 mm (4.1 in)
1997	36.5 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Zastron (Tnk), 1888 to 1997. The record is 239.0 mm (9.4 in) in 1988, marked on the chart; the median year is 81.6 mm (3.2 in).

Wettest five days (Rx5day) at Zastron (Tnk) by year
Year	Wettest five days (Rx5day)
1888	63.0 mm (2.5 in)
1905	84.6 mm (3.3 in)
1906	73.9 mm (2.9 in)
1907	80.0 mm (3.1 in)
1908	80.0 mm (3.1 in)
1909	173.0 mm (6.8 in)
1910	88.3 mm (3.5 in)
1911	62.6 mm (2.5 in)
1912	45.7 mm (1.8 in)
1913	84.1 mm (3.3 in)
1914	68.2 mm (2.7 in)
1915	77.0 mm (3.0 in)
1916	59.0 mm (2.3 in)
1917	91.2 mm (3.6 in)
1918	80.8 mm (3.2 in)
1919	43.6 mm (1.7 in)
1920	88.1 mm (3.5 in)
1921	98.5 mm (3.9 in)
1922	76.4 mm (3.0 in)
1923	158.7 mm (6.2 in)
1924	99.3 mm (3.9 in)
1925	165.4 mm (6.5 in)
1926	97.6 mm (3.8 in)
1927	138.9 mm (5.5 in)
1928	71.3 mm (2.8 in)
1929	75.2 mm (3.0 in)
1930	54.4 mm (2.1 in)
1931	81.8 mm (3.2 in)
1932	86.4 mm (3.4 in)
1933	89.5 mm (3.5 in)
1934	87.3 mm (3.4 in)
1935	62.8 mm (2.5 in)
1936	77.2 mm (3.0 in)
1937	83.3 mm (3.3 in)
1938	119.9 mm (4.7 in)
1939	67.8 mm (2.7 in)
1940	71.9 mm (2.8 in)
1941	117.3 mm (4.6 in)
1942	95.8 mm (3.8 in)
1943	155.8 mm (6.1 in)
1944	95.0 mm (3.7 in)
1945	50.5 mm (2.0 in)
1946	79.0 mm (3.1 in)
1947	72.4 mm (2.9 in)
1948	74.1 mm (2.9 in)
1949	59.2 mm (2.3 in)
1950	119.6 mm (4.7 in)
1951	119.9 mm (4.7 in)
1952	81.3 mm (3.2 in)
1953	61.0 mm (2.4 in)
1954	40.6 mm (1.6 in)
1955	62.2 mm (2.4 in)
1956	53.1 mm (2.1 in)
1957	63.3 mm (2.5 in)
1958	75.4 mm (3.0 in)
1959	61.0 mm (2.4 in)
1960	114.5 mm (4.5 in)
1961	106.0 mm (4.2 in)
1962	113.5 mm (4.5 in)
1963	120.5 mm (4.7 in)
1964	76.0 mm (3.0 in)
1965	51.6 mm (2.0 in)
1966	147.0 mm (5.8 in)
1967	105.0 mm (4.1 in)
1968	62.0 mm (2.4 in)
1969	94.5 mm (3.7 in)
1970	97.0 mm (3.8 in)
1971	59.0 mm (2.3 in)
1972	143.0 mm (5.6 in)
1973	98.5 mm (3.9 in)
1974	145.2 mm (5.7 in)
1975	120.0 mm (4.7 in)
1976	108.5 mm (4.3 in)
1977	60.7 mm (2.4 in)
1978	92.9 mm (3.7 in)
1979	71.0 mm (2.8 in)
1980	67.0 mm (2.6 in)
1981	108.7 mm (4.3 in)
1982	102.0 mm (4.0 in)
1983	70.5 mm (2.8 in)
1984	87.1 mm (3.4 in)
1985	94.6 mm (3.7 in)
1986	90.0 mm (3.5 in)
1987	64.1 mm (2.5 in)
1988	239.0 mm (9.4 in)
1989	79.0 mm (3.1 in)
1990	59.9 mm (2.4 in)
1991	101.4 mm (4.0 in)
1992	55.5 mm (2.2 in)
1993	47.2 mm (1.9 in)
1994	66.1 mm (2.6 in)
1995	111.5 mm (4.4 in)
1996	118.5 mm (4.7 in)
1997	53.5 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Zastron (Tnk), 1888 to 1997. The record is 148 days in 1948, marked on the chart; the median year is 50 days.

Longest dry spell (CDD) at Zastron (Tnk) by year
Year	Longest dry spell (CDD)
1888	27 days
1905	24 days
1906	18 days
1907	49 days
1908	35 days
1909	47 days
1910	87 days
1911	37 days
1912	58 days
1913	49 days
1914	14 days
1915	67 days
1916	64 days
1917	46 days
1918	113 days
1919	36 days
1920	70 days
1921	62 days
1922	53 days
1923	31 days
1924	35 days
1925	32 days
1926	33 days
1927	69 days
1928	65 days
1929	21 days
1930	65 days
1931	60 days
1932	49 days
1933	53 days
1934	56 days
1935	37 days
1936	58 days
1937	57 days
1938	29 days
1939	31 days
1940	42 days
1941	40 days
1942	75 days
1943	27 days
1944	91 days
1945	82 days
1946	61 days
1947	64 days
1948	148 days
1949	44 days
1950	34 days
1951	56 days
1952	36 days
1953	91 days
1954	30 days
1955	33 days
1956	48 days
1957	36 days
1958	92 days
1959	56 days
1960	41 days
1961	44 days
1962	51 days
1963	62 days
1964	46 days
1965	49 days
1966	115 days
1967	44 days
1968	34 days
1969	68 days
1970	41 days
1971	67 days
1972	119 days
1973	52 days
1974	61 days
1975	39 days
1976	42 days
1977	77 days
1978	75 days
1979	40 days
1980	73 days
1981	76 days
1982	49 days
1983	46 days
1984	56 days
1985	73 days
1986	49 days
1987	47 days
1988	54 days
1989	54 days
1990	53 days
1991	88 days
1992	93 days
1993	59 days
1994	84 days
1995	37 days
1996	27 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

77 years, 1907 to 1996

A day with at least 51.6 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 130.3 mm (5.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Zastron (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	51.6 mm (2.0 in)
5 years	69.8 mm (2.7 in)
10 years	82.8 mm (3.3 in)
25 years	100.8 mm (4.0 in)
50 years	115.1 mm (4.5 in)
100 years	130.3 mm (5.1 in)	Longer than the 77 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, 77 years of values from 1907 to 1996.

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: 108.5 mm (4.3 in) in 1976; 105.0 mm (4.1 in) in 1974; 105.0 mm (4.1 in) in 1996.

Download the Data

Data for Zastron (Tnk) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Zastron (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 2026-10-14 (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