Heilbron (Tnk) Weather Records (SF004028270)

Record envelope, standing records and threshold days for Heilbron (Tnk) (SF004028270), South Africa, with 107 years of record.

Key Facts for Heilbron (Tnk)

Heilbron (Tnk) (SF004028270) is a weather station in South Africa at -27.28 latitude and 27.30 longitude, 1,391 m (4,564 ft) above sea level.
The station reports from 1891 to 1997, 107 years of record.
0 records set at Heilbron (Tnk) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Heilbron (Tnk) set a daily record precipitation of 53.4 mm (2.1 in) on 29 November 1997.

About the Station

Location: South Africa, -27.28 latitude, 27.30 longitude.
Elevation: 1,391 m (4,564 ft).
Period of record: 1891 to 1997, 107 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 Heilbron (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 Heilbron (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 Heilbron (Tnk) still stand.

Wettest Day of Each Month

Jan: 175.0 mm (6.9 in)

The wettest day on record for each calendar month at Heilbron (Tnk). The most was 175.0 mm (6.9 in) on 6 January 1892.

Record daily precipitation for each month at Heilbron (Tnk)
Month	Record daily precipitation (mm)	Date
Jan	175.0 mm (6.9 in)	6 January 1892
Feb	96.0 mm (3.8 in)	22 February 1989
Mar	86.4 mm (3.4 in)	19 March 1935
Apr	69.0 mm (2.7 in)	8 April 1971
May	43.7 mm (1.7 in)	24 May 1936
Jun	25.4 mm (1.0 in)	12 June 1944
Jul	42.5 mm (1.7 in)	2 July 1957
Aug	47.0 mm (1.9 in)	12 August 1934
Sep	62.2 mm (2.4 in)	27 September 1987
Oct	92.1 mm (3.6 in)	31 October 1964
Nov	132.1 mm (5.2 in)	5 November 1891
Dec	149.4 mm (5.9 in)	5 December 1891

Latest Records

Latest records at Heilbron (Tnk)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 November 1997	Heilbron (Tnk), ZA	daily rain	53.4 mm (2.1 in)	20.2 mm (0.8 in)	14 years	29 of 100 (Routine)
25 October 1997	Heilbron (Tnk), ZA	daily rain	19.5 mm (0.8 in)	1.0 mm (0.04 in)	32 years	19 of 100 (Routine)
27 July 1997	Heilbron (Tnk), ZA	daily rain	10.5 mm (0.4 in)	5.2 mm (0.20 in)	70 years	20 of 100 (Routine)
11 June 1997	Heilbron (Tnk), ZA	daily rain	11.5 mm (0.5 in)	5.7 mm (0.22 in)	104 years	20 of 100 (Routine)
10 June 1997	Heilbron (Tnk), ZA	daily rain	2.5 mm (0.10 in)	2.5 mm (0.10 in)	104 years	20 of 100 (Routine)
27 May 1997	Heilbron (Tnk), ZA	daily rain	24.0 mm (0.9 in)	13.3 mm (0.5 in)	92 years	20 of 100 (Routine)
25 May 1997	Heilbron (Tnk), ZA	daily rain	35.5 mm (1.4 in)	31.5 mm (1.2 in)	40 years	62 of 100 (Major)
22 April 1997	Heilbron (Tnk), ZA	daily rain	26.0 mm (1.0 in)	9.0 mm (0.35 in)	46 years	32 of 100 (Routine)
4 April 1997	Heilbron (Tnk), ZA	daily rain	31.0 mm (1.2 in)	3.5 mm (0.14 in)	36 years	23 of 100 (Routine)
25 March 1997	Heilbron (Tnk), ZA	daily rain	46.5 mm (1.8 in)	0.5 mm (0.02 in)	43 years	22 of 100 (Routine)
17 March 1997	Heilbron (Tnk), ZA	daily rain	51.0 mm (2.0 in)	20.0 mm (0.8 in)	51 years	41 of 100 (Notable)
2 March 1997	Heilbron (Tnk), ZA	daily rain	18.5 mm (0.7 in)	0.7 mm (0.03 in)	66 years	20 of 100 (Routine)
7 February 1997	Heilbron (Tnk), ZA	daily rain	34.0 mm (1.3 in)	8.0 mm (0.31 in)	30 years	25 of 100 (Routine)
16 November 1996	Heilbron (Tnk), ZA	daily rain	49.0 mm (1.9 in)	13.9 mm (0.5 in)	47 years	34 of 100 (Routine)
13 May 1996	Heilbron (Tnk), ZA	daily rain	11.0 mm (0.4 in)	0.6 mm (0.02 in)	45 years	20 of 100 (Routine)
17 April 1996	Heilbron (Tnk), ZA	daily rain	24.0 mm (0.9 in)	4.0 mm (0.16 in)	13 years	17 of 100 (Routine)
14 March 1996	Heilbron (Tnk), ZA	daily rain	44.5 mm (1.8 in)	11.5 mm (0.5 in)	7 years	21 of 100 (Routine)
3 March 1996	Heilbron (Tnk), ZA	daily rain	52.0 mm (2.0 in)	27.4 mm (1.1 in)	86 years	58 of 100 (Notable)
13 February 1996	Heilbron (Tnk), ZA	daily rain	29.0 mm (1.1 in)	1.0 mm (0.04 in)	5 years	11 of 100 (Routine)
11 February 1996	Heilbron (Tnk), ZA	daily rain	53.0 mm (2.1 in)	17.0 mm (0.7 in)	40 years	34 of 100 (Routine)

Extremes by Year

1891 to 1997

Yearly extremes at Heilbron (Tnk): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	175.0 mm (6.9 in)	1892	57.0 mm (2.2 in)	85
Wettest five days (Rx5day)	260.0 mm (10.2 in)	1980	88.7 mm (3.5 in)	85
Longest dry spell (CDD)	187 days	1966	74 days	85

Wettest day (Rx1day)

The wettest day of the year at Heilbron (Tnk), 1891 to 1997. The record is 175.0 mm (6.9 in) in 1892, marked on the chart; the median year is 57.0 mm (2.2 in).

Wettest day (Rx1day) at Heilbron (Tnk) by year
Year	Wettest day (Rx1day)
1891	149.4 mm (5.9 in)
1892	175.0 mm (6.9 in)
1905	66.0 mm (2.6 in)
1906	49.3 mm (1.9 in)
1907	86.1 mm (3.4 in)
1908	26.4 mm (1.0 in)
1909	73.9 mm (2.9 in)
1910	29.7 mm (1.2 in)
1911	55.4 mm (2.2 in)
1912	76.5 mm (3.0 in)
1913	31.2 mm (1.2 in)
1914	70.9 mm (2.8 in)
1915	58.7 mm (2.3 in)
1916	105.2 mm (4.1 in)
1917	22.6 mm (0.9 in)
1927	32.0 mm (1.3 in)
1928	43.2 mm (1.7 in)
1930	34.3 mm (1.4 in)
1931	35.6 mm (1.4 in)
1932	35.6 mm (1.4 in)
1933	26.9 mm (1.1 in)
1934	83.8 mm (3.3 in)
1935	86.4 mm (3.4 in)
1936	93.2 mm (3.7 in)
1937	68.3 mm (2.7 in)
1938	45.2 mm (1.8 in)
1939	38.1 mm (1.5 in)
1940	77.7 mm (3.1 in)
1941	30.7 mm (1.2 in)
1942	57.2 mm (2.3 in)
1943	47.8 mm (1.9 in)
1944	55.9 mm (2.2 in)
1945	33.0 mm (1.3 in)
1946	38.1 mm (1.5 in)
1947	29.2 mm (1.1 in)
1948	31.8 mm (1.3 in)
1949	64.3 mm (2.5 in)
1950	52.8 mm (2.1 in)
1951	59.9 mm (2.4 in)
1952	49.8 mm (2.0 in)
1953	72.2 mm (2.8 in)
1954	46.0 mm (1.8 in)
1955	76.0 mm (3.0 in)
1956	57.0 mm (2.2 in)
1957	42.5 mm (1.7 in)
1958	31.5 mm (1.2 in)
1959	50.0 mm (2.0 in)
1960	53.0 mm (2.1 in)
1961	92.0 mm (3.6 in)
1962	59.5 mm (2.3 in)
1963	78.2 mm (3.1 in)
1964	92.1 mm (3.6 in)
1965	27.5 mm (1.1 in)
1966	35.0 mm (1.4 in)
1967	56.5 mm (2.2 in)
1968	28.0 mm (1.1 in)
1969	37.0 mm (1.5 in)
1970	61.5 mm (2.4 in)
1971	69.0 mm (2.7 in)
1972	74.0 mm (2.9 in)
1973	67.0 mm (2.6 in)
1974	71.0 mm (2.8 in)
1975	77.6 mm (3.1 in)
1976	48.0 mm (1.9 in)
1977	47.0 mm (1.9 in)
1978	42.0 mm (1.7 in)
1979	45.0 mm (1.8 in)
1980	100.0 mm (3.9 in)
1981	49.0 mm (1.9 in)
1982	70.0 mm (2.8 in)
1983	44.6 mm (1.8 in)
1984	75.4 mm (3.0 in)
1985	91.2 mm (3.6 in)
1986	57.0 mm (2.2 in)
1987	62.2 mm (2.4 in)
1988	81.0 mm (3.2 in)
1989	96.0 mm (3.8 in)
1990	36.5 mm (1.4 in)
1991	59.0 mm (2.3 in)
1992	38.1 mm (1.5 in)
1993	68.0 mm (2.7 in)
1994	59.0 mm (2.3 in)
1995	60.0 mm (2.4 in)
1996	68.6 mm (2.7 in)
1997	53.4 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Heilbron (Tnk), 1891 to 1997. The record is 260.0 mm (10.2 in) in 1980, marked on the chart; the median year is 88.7 mm (3.5 in).

Wettest five days (Rx5day) at Heilbron (Tnk) by year
Year	Wettest five days (Rx5day)
1891	149.4 mm (5.9 in)
1892	175.0 mm (6.9 in)
1905	85.6 mm (3.4 in)
1906	82.5 mm (3.2 in)
1907	93.0 mm (3.7 in)
1908	54.6 mm (2.1 in)
1909	176.9 mm (7.0 in)
1910	49.5 mm (1.9 in)
1911	79.5 mm (3.1 in)
1912	145.0 mm (5.7 in)
1913	91.4 mm (3.6 in)
1914	98.6 mm (3.9 in)
1915	117.4 mm (4.6 in)
1916	200.3 mm (7.9 in)
1917	47.4 mm (1.9 in)
1927	54.8 mm (2.2 in)
1928	92.4 mm (3.6 in)
1930	69.9 mm (2.8 in)
1931	76.3 mm (3.0 in)
1932	62.3 mm (2.5 in)
1933	55.0 mm (2.2 in)
1934	141.3 mm (5.6 in)
1935	99.4 mm (3.9 in)
1936	160.1 mm (6.3 in)
1937	86.1 mm (3.4 in)
1938	82.9 mm (3.3 in)
1939	68.8 mm (2.7 in)
1940	153.6 mm (6.0 in)
1941	44.9 mm (1.8 in)
1942	112.3 mm (4.4 in)
1943	91.7 mm (3.6 in)
1944	169.4 mm (6.7 in)
1945	71.9 mm (2.8 in)
1946	79.3 mm (3.1 in)
1947	68.5 mm (2.7 in)
1948	83.3 mm (3.3 in)
1949	97.0 mm (3.8 in)
1950	74.2 mm (2.9 in)
1951	132.3 mm (5.2 in)
1952	139.9 mm (5.5 in)
1953	122.4 mm (4.8 in)
1954	71.5 mm (2.8 in)
1955	148.5 mm (5.8 in)
1956	62.0 mm (2.4 in)
1957	78.5 mm (3.1 in)
1958	56.0 mm (2.2 in)
1959	82.0 mm (3.2 in)
1960	75.0 mm (3.0 in)
1961	120.5 mm (4.7 in)
1962	86.0 mm (3.4 in)
1963	88.7 mm (3.5 in)
1964	127.1 mm (5.0 in)
1965	46.0 mm (1.8 in)
1966	76.0 mm (3.0 in)
1967	86.5 mm (3.4 in)
1968	56.2 mm (2.2 in)
1969	64.5 mm (2.5 in)
1970	77.0 mm (3.0 in)
1971	100.5 mm (4.0 in)
1972	74.0 mm (2.9 in)
1973	103.5 mm (4.1 in)
1974	115.0 mm (4.5 in)
1975	155.1 mm (6.1 in)
1976	86.0 mm (3.4 in)
1977	82.0 mm (3.2 in)
1978	90.4 mm (3.6 in)
1979	77.0 mm (3.0 in)
1980	260.0 mm (10.2 in)
1981	125.5 mm (4.9 in)
1982	88.7 mm (3.5 in)
1983	80.2 mm (3.2 in)
1984	143.9 mm (5.7 in)
1985	107.0 mm (4.2 in)
1986	72.0 mm (2.8 in)
1987	94.4 mm (3.7 in)
1988	115.7 mm (4.6 in)
1989	109.2 mm (4.3 in)
1990	81.5 mm (3.2 in)
1991	116.5 mm (4.6 in)
1992	71.2 mm (2.8 in)
1993	103.0 mm (4.1 in)
1994	83.0 mm (3.3 in)
1995	107.8 mm (4.2 in)
1996	116.1 mm (4.6 in)
1997	102.0 mm (4.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Heilbron (Tnk), 1891 to 1997. The record is 187 days in 1966, marked on the chart; the median year is 74 days.

Longest dry spell (CDD) at Heilbron (Tnk) by year
Year	Longest dry spell (CDD)
1891	34 days
1892	53 days
1905	82 days
1906	107 days
1907	19 days
1908	40 days
1909	73 days
1910	75 days
1911	33 days
1912	40 days
1913	40 days
1914	84 days
1915	55 days
1916	65 days
1917	22 days
1927	54 days
1928	60 days
1930	69 days
1931	95 days
1932	104 days
1933	70 days
1934	52 days
1935	109 days
1936	110 days
1937	177 days
1938	30 days
1939	54 days
1940	90 days
1941	159 days
1942	91 days
1943	38 days
1944	93 days
1945	140 days
1946	129 days
1947	50 days
1948	126 days
1949	56 days
1950	33 days
1951	52 days
1952	82 days
1953	160 days
1954	99 days
1955	107 days
1956	107 days
1957	51 days
1958	133 days
1959	60 days
1960	95 days
1961	105 days
1962	123 days
1963	95 days
1964	51 days
1965	61 days
1966	187 days
1967	63 days
1968	101 days
1969	52 days
1970	74 days
1971	126 days
1972	85 days
1973	117 days
1974	142 days
1975	109 days
1976	147 days
1977	137 days
1978	73 days
1979	37 days
1980	50 days
1981	77 days
1982	65 days
1983	57 days
1984	48 days
1985	132 days
1986	50 days
1987	122 days
1988	61 days
1989	47 days
1990	71 days
1991	95 days
1992	53 days
1993	88 days
1994	157 days
1995	113 days
1996	50 days
1997	45 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, 1906 to 1997

A day with at least 55.9 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 110.2 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Heilbron (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	55.9 mm (2.2 in)
5 years	73.7 mm (2.9 in)
10 years	84.0 mm (3.3 in)
25 years	95.6 mm (3.8 in)
50 years	103.3 mm (4.1 in)
100 years	110.2 mm (4.3 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 1906 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: 105.2 mm (4.1 in) in 1916; 96.0 mm (3.8 in) in 1989; 93.2 mm (3.7 in) in 1936.

Download the Data

Data for Heilbron (Tnk) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Heilbron (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