Tonti (Bos) Weather Records (SF001807120)

Record envelope, standing records and threshold days for Tonti (Bos) (SF001807120), South Africa, with 81 years of record.

Key Facts for Tonti (Bos)

Tonti (Bos) (SF001807120) is a weather station in South Africa at -30.87 latitude and 29.43 longitude, 1,200 m (3,937 ft) above sea level.
The station reports from 1914 to 1994, 81 years of record.
0 records set at Tonti (Bos) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Tonti (Bos) set a daily record precipitation of 63.6 mm (2.5 in) on 8 March 1994.

About the Station

Location: South Africa, -30.87 latitude, 29.43 longitude.
Elevation: 1,200 m (3,937 ft).
Period of record: 1914 to 1994, 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 Tonti (Bos). 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 Tonti (Bos), 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 Tonti (Bos) still stand.

All-Time Record Progression

3 new records

3 all-time records were set at Tonti (Bos) between 17 May 1959 and 20 August 1978. Each dot is a new record.

When Tonti (Bos) set new all-time records
Date	Kind	Detail
1959-05-17	Record daily precipitation	Record daily precipitation 177.0 mm (7.0 in)
1978-08-19	Record daily precipitation	Record daily precipitation 200.0 mm (7.9 in)
1978-08-20	Record daily precipitation	Record daily precipitation 250.5 mm (9.9 in)

Wettest Day of Each Month

Aug: 250.5 mm (9.9 in)

The wettest day on record for each calendar month at Tonti (Bos). The most was 250.5 mm (9.9 in) on 20 August 1978.

Record daily precipitation for each month at Tonti (Bos)
Month	Record daily precipitation (mm)	Date
Jan	89.2 mm (3.5 in)	30 January 1949
Feb	104.2 mm (4.1 in)	7 February 1994
Mar	95.0 mm (3.7 in)	19 March 1967
Apr	118.5 mm (4.7 in)	20 April 1978
May	177.0 mm (7.0 in)	17 May 1959
Jun	148.0 mm (5.8 in)	19 June 1964
Jul	144.8 mm (5.7 in)	21 July 1923
Aug	250.5 mm (9.9 in)	20 August 1978
Sep	230.0 mm (9.1 in)	7 September 1978
Oct	190.0 mm (7.5 in)	17 October 1978
Nov	200.0 mm (7.9 in)	9 November 1978
Dec	72.3 mm (2.8 in)	4 December 1988

Latest Records

Latest records at Tonti (Bos)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 March 1994	Tonti (Bos), ZA	daily rain	63.6 mm (2.5 in)	3.1 mm (0.12 in)	31 years	19 of 100 (Routine)
7 February 1994	Tonti (Bos), ZA	monthly rain	104.2 mm (4.1 in)	14.3 mm (0.6 in)	8 years	30 of 100 (Routine)
9 January 1994	Tonti (Bos), ZA	daily rain	52.5 mm (2.1 in)	23.3 mm (0.9 in)	60 years	44 of 100 (Notable)
3 January 1994	Tonti (Bos), ZA	daily rain	34.0 mm (1.3 in)	9.3 mm (0.37 in)	40 years	27 of 100 (Routine)
19 October 1993	Tonti (Bos), ZA	daily rain (Tie)	20.0 mm (0.8 in)	tie	28 years	4 of 100 (Routine)
6 October 1993	Tonti (Bos), ZA	daily rain	25.1 mm (1.0 in)	2.8 mm (0.11 in)	7 years	12 of 100 (Routine)
24 January 1993	Tonti (Bos), ZA	daily rain	48.0 mm (1.9 in)	18.0 mm (0.7 in)	41 years	34 of 100 (Routine)
12 April 1992	Tonti (Bos), ZA	daily rain	26.3 mm (1.0 in)	0.3 mm (0.01 in)	34 years	17 of 100 (Routine)
1 March 1992	Tonti (Bos), ZA	daily rain	38.0 mm (1.5 in)	1.7 mm (0.07 in)	49 years	22 of 100 (Routine)
3 December 1991	Tonti (Bos), ZA	daily rain	52.0 mm (2.0 in)	23.0 mm (0.9 in)	72 years	48 of 100 (Notable)
12 November 1991	Tonti (Bos), ZA	daily rain	67.0 mm (2.6 in)	14.4 mm (0.6 in)	44 years	29 of 100 (Routine)
17 February 1991	Tonti (Bos), ZA	daily rain	56.2 mm (2.2 in)	16.2 mm (0.6 in)	35 years	28 of 100 (Routine)
18 October 1990	Tonti (Bos), ZA	daily rain	31.0 mm (1.2 in)	3.3 mm (0.13 in)	48 years	23 of 100 (Routine)
29 August 1990	Tonti (Bos), ZA	daily rain	55.2 mm (2.2 in)	22.2 mm (0.9 in)	55 years	33 of 100 (Routine)
28 May 1990	Tonti (Bos), ZA	daily rain	52.5 mm (2.1 in)	36.8 mm (1.4 in)	45 years	39 of 100 (Notable)
4 March 1990	Tonti (Bos), ZA	daily rain	66.0 mm (2.6 in)	24.0 mm (0.9 in)	32 years	33 of 100 (Routine)
18 December 1989	Tonti (Bos), ZA	daily rain	34.7 mm (1.4 in)	1.7 mm (0.07 in)	43 years	20 of 100 (Routine)
29 November 1989	Tonti (Bos), ZA	daily rain	33.7 mm (1.3 in)	5.2 mm (0.20 in)	2 years	10 of 100 (Routine)
22 November 1989	Tonti (Bos), ZA	daily rain	30.0 mm (1.2 in)	8.5 mm (0.33 in)	26 years	19 of 100 (Routine)
14 November 1989	Tonti (Bos), ZA	daily rain	38.8 mm (1.5 in)	1.2 mm (0.05 in)	52 years	22 of 100 (Routine)

Extremes by Year

1914 to 1994

Yearly extremes at Tonti (Bos): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	250.5 mm (9.9 in)	1978	66.8 mm (2.6 in)	81
Wettest five days (Rx5day)	600.5 mm (23.6 in)	1978	111.2 mm (4.4 in)	81
Longest dry spell (CDD)	228 days	1914	36 days	81

Wettest day (Rx1day)

The wettest day of the year at Tonti (Bos), 1914 to 1994. The record is 250.5 mm (9.9 in) in 1978, marked on the chart; the median year is 66.8 mm (2.6 in).

Wettest day (Rx1day) at Tonti (Bos) by year
Year	Wettest day (Rx1day)
1914	58.4 mm (2.3 in)
1915	76.2 mm (3.0 in)
1916	58.4 mm (2.3 in)
1917	63.5 mm (2.5 in)
1918	58.4 mm (2.3 in)
1919	41.1 mm (1.6 in)
1920	73.7 mm (2.9 in)
1921	58.4 mm (2.3 in)
1922	138.7 mm (5.5 in)
1923	144.8 mm (5.7 in)
1924	49.8 mm (2.0 in)
1925	56.9 mm (2.2 in)
1926	51.8 mm (2.0 in)
1927	50.5 mm (2.0 in)
1928	67.1 mm (2.6 in)
1929	44.5 mm (1.8 in)
1930	50.3 mm (2.0 in)
1931	115.1 mm (4.5 in)
1932	82.3 mm (3.2 in)
1933	52.3 mm (2.1 in)
1934	66.8 mm (2.6 in)
1935	73.7 mm (2.9 in)
1936	50.8 mm (2.0 in)
1937	65.8 mm (2.6 in)
1938	63.5 mm (2.5 in)
1939	62.0 mm (2.4 in)
1940	75.4 mm (3.0 in)
1941	79.2 mm (3.1 in)
1942	95.5 mm (3.8 in)
1943	86.9 mm (3.4 in)
1944	73.2 mm (2.9 in)
1945	82.8 mm (3.3 in)
1946	35.8 mm (1.4 in)
1947	96.8 mm (3.8 in)
1948	61.7 mm (2.4 in)
1949	89.2 mm (3.5 in)
1950	74.9 mm (2.9 in)
1951	38.1 mm (1.5 in)
1952	47.0 mm (1.9 in)
1953	75.0 mm (3.0 in)
1954	88.2 mm (3.5 in)
1955	56.6 mm (2.2 in)
1956	52.0 mm (2.0 in)
1957	42.0 mm (1.7 in)
1958	48.0 mm (1.9 in)
1959	177.0 mm (7.0 in)
1960	51.0 mm (2.0 in)
1961	48.0 mm (1.9 in)
1962	71.0 mm (2.8 in)
1963	82.0 mm (3.2 in)
1964	148.0 mm (5.8 in)
1965	46.0 mm (1.8 in)
1966	136.0 mm (5.4 in)
1967	95.0 mm (3.7 in)
1968	43.0 mm (1.7 in)
1969	90.0 mm (3.5 in)
1970	69.0 mm (2.7 in)
1971	61.5 mm (2.4 in)
1972	75.0 mm (3.0 in)
1973	79.0 mm (3.1 in)
1974	38.0 mm (1.5 in)
1975	73.5 mm (2.9 in)
1976	57.0 mm (2.2 in)
1977	45.0 mm (1.8 in)
1978	250.5 mm (9.9 in)
1979	49.3 mm (1.9 in)
1980	24.5 mm (1.0 in)
1981	190.0 mm (7.5 in)
1982	60.0 mm (2.4 in)
1983	51.5 mm (2.0 in)
1984	67.0 mm (2.6 in)
1985	107.5 mm (4.2 in)
1986	86.6 mm (3.4 in)
1987	161.0 mm (6.3 in)
1988	78.1 mm (3.1 in)
1989	74.2 mm (2.9 in)
1990	66.0 mm (2.6 in)
1991	67.0 mm (2.6 in)
1992	54.5 mm (2.1 in)
1993	48.5 mm (1.9 in)
1994	104.2 mm (4.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tonti (Bos), 1914 to 1994. The record is 600.5 mm (23.6 in) in 1978, marked on the chart; the median year is 111.2 mm (4.4 in).

Wettest five days (Rx5day) at Tonti (Bos) by year
Year	Wettest five days (Rx5day)
1914	92.7 mm (3.6 in)
1915	123.2 mm (4.9 in)
1916	111.2 mm (4.4 in)
1917	135.8 mm (5.3 in)
1918	73.6 mm (2.9 in)
1919	80.3 mm (3.2 in)
1920	111.5 mm (4.4 in)
1921	116.4 mm (4.6 in)
1922	172.8 mm (6.8 in)
1923	226.9 mm (8.9 in)
1924	83.3 mm (3.3 in)
1925	104.2 mm (4.1 in)
1926	70.1 mm (2.8 in)
1927	138.3 mm (5.4 in)
1928	107.1 mm (4.2 in)
1929	79.0 mm (3.1 in)
1930	87.4 mm (3.4 in)
1931	214.6 mm (8.4 in)
1932	131.8 mm (5.2 in)
1933	81.3 mm (3.2 in)
1934	93.4 mm (3.7 in)
1935	103.4 mm (4.1 in)
1936	134.8 mm (5.3 in)
1937	82.0 mm (3.2 in)
1938	92.0 mm (3.6 in)
1939	115.5 mm (4.5 in)
1940	130.8 mm (5.1 in)
1941	112.4 mm (4.4 in)
1942	130.1 mm (5.1 in)
1943	117.6 mm (4.6 in)
1944	133.8 mm (5.3 in)
1945	111.5 mm (4.4 in)
1946	98.9 mm (3.9 in)
1947	156.2 mm (6.1 in)
1948	99.5 mm (3.9 in)
1949	135.5 mm (5.3 in)
1950	148.6 mm (5.9 in)
1951	75.0 mm (3.0 in)
1952	82.7 mm (3.3 in)
1953	96.6 mm (3.8 in)
1954	98.6 mm (3.9 in)
1955	159.0 mm (6.3 in)
1956	125.0 mm (4.9 in)
1957	93.0 mm (3.7 in)
1958	118.0 mm (4.6 in)
1959	250.0 mm (9.8 in)
1960	70.5 mm (2.8 in)
1961	81.5 mm (3.2 in)
1962	127.0 mm (5.0 in)
1963	188.5 mm (7.4 in)
1964	190.5 mm (7.5 in)
1965	99.5 mm (3.9 in)
1966	165.0 mm (6.5 in)
1967	117.0 mm (4.6 in)
1968	74.5 mm (2.9 in)
1969	145.0 mm (5.7 in)
1970	107.0 mm (4.2 in)
1971	101.0 mm (4.0 in)
1972	139.0 mm (5.5 in)
1973	86.5 mm (3.4 in)
1974	86.5 mm (3.4 in)
1975	123.5 mm (4.9 in)
1976	175.0 mm (6.9 in)
1977	84.0 mm (3.3 in)
1978	600.5 mm (23.6 in)
1979	56.5 mm (2.2 in)
1980	38.0 mm (1.5 in)
1981	207.0 mm (8.1 in)
1982	132.0 mm (5.2 in)
1983	56.5 mm (2.2 in)
1984	91.5 mm (3.6 in)
1985	195.0 mm (7.7 in)
1986	108.6 mm (4.3 in)
1987	254.8 mm (10.0 in)
1988	107.5 mm (4.2 in)
1989	183.4 mm (7.2 in)
1990	73.4 mm (2.9 in)
1991	123.4 mm (4.9 in)
1992	69.7 mm (2.7 in)
1993	84.5 mm (3.3 in)
1994	106.5 mm (4.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tonti (Bos), 1914 to 1994. The record is 228 days in 1914, marked on the chart; the median year is 36 days.

Longest dry spell (CDD) at Tonti (Bos) by year
Year	Longest dry spell (CDD)
1914	228 days
1915	31 days
1916	106 days
1917	60 days
1918	29 days
1919	31 days
1920	33 days
1921	26 days
1922	21 days
1923	20 days
1924	39 days
1925	30 days
1926	21 days
1927	61 days
1928	33 days
1929	24 days
1930	28 days
1931	27 days
1932	27 days
1933	33 days
1934	32 days
1935	38 days
1936	53 days
1937	50 days
1938	15 days
1939	25 days
1940	44 days
1941	119 days
1942	82 days
1943	29 days
1944	20 days
1945	34 days
1946	45 days
1947	23 days
1948	45 days
1949	52 days
1950	32 days
1951	37 days
1952	19 days
1953	35 days
1954	30 days
1955	82 days
1956	55 days
1957	23 days
1958	80 days
1959	50 days
1960	57 days
1961	24 days
1962	104 days
1963	29 days
1964	32 days
1965	30 days
1966	38 days
1967	32 days
1968	30 days
1969	31 days
1970	43 days
1971	24 days
1972	26 days
1973	47 days
1974	40 days
1975	67 days
1976	36 days
1977	53 days
1978	108 days
1979	46 days
1980	46 days
1981	31 days
1982	35 days
1983	38 days
1984	27 days
1985	56 days
1986	50 days
1987	38 days
1988	34 days
1989	80 days
1990	82 days
1991	60 days
1992	61 days
1993	101 days
1994	69 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

78 years, 1914 to 1992

A day with at least 65.2 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 229.4 mm (9.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Tonti (Bos): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	65.2 mm (2.6 in)
5 years	92.9 mm (3.7 in)
10 years	116.3 mm (4.6 in)
25 years	153.6 mm (6.0 in)
50 years	188.1 mm (7.4 in)
100 years	229.4 mm (9.0 in)	Longer than the 78 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, 78 years of values from 1914 to 1992.

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: 250.5 mm (9.9 in) in 1978; 190.0 mm (7.5 in) in 1981; 177.0 mm (7.0 in) in 1959.

Download the Data

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