Bon Accord Dam Weather Records (SF005133370)

Record envelope, standing records and threshold days for Bon Accord Dam (SF005133370), South Africa, with 72 years of record.

Key Facts for Bon Accord Dam

Bon Accord Dam (SF005133370) is a weather station in South Africa at -25.62 latitude and 28.20 longitude, 1,200 m (3,937 ft) above sea level.
The station reports from 1926 to 1997, 72 years of record.
0 records set at Bon Accord Dam still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Bon Accord Dam set a daily record precipitation of 18.0 mm (0.7 in) on 28 May 1997.

About the Station

Location: South Africa, -25.62 latitude, 28.20 longitude.
Elevation: 1,200 m (3,937 ft).
Period of record: 1926 to 1997, 72 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 Bon Accord Dam. 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 Bon Accord Dam, 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 Bon Accord Dam still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Bon Accord Dam between 28 October 1986 and 28 October 1986. Each dot is a new record.

Wettest Day of Each Month

Oct: 131.0 mm (5.2 in)

The wettest day on record for each calendar month at Bon Accord Dam. The most was 131.0 mm (5.2 in) on 28 October 1986.

Record daily precipitation for each month at Bon Accord Dam
Month	Record daily precipitation (mm)	Date
Jan	96.5 mm (3.8 in)	12 January 1928
Feb	125.7 mm (4.9 in)	10 February 1937
Mar	101.0 mm (4.0 in)	21 March 1983
Apr	87.5 mm (3.4 in)	14 April 1965
May	64.8 mm (2.6 in)	23 May 1936
Jun	69.9 mm (2.8 in)	14 June 1944
Jul	85.0 mm (3.3 in)	4 July 1957
Aug	32.0 mm (1.3 in)	24 August 1957
Sep	42.0 mm (1.7 in)	28 September 1973
Oct	131.0 mm (5.2 in)	28 October 1986
Nov	84.0 mm (3.3 in)	18 November 1995
Dec	83.0 mm (3.3 in)	2 December 1971

Latest Records

Latest records at Bon Accord Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 May 1997	Bon Accord Dam, ZA	daily rain	18.0 mm (0.7 in)	4.0 mm (0.16 in)	36 years	20 of 100 (Routine)
25 May 1997	Bon Accord Dam, ZA	daily rain	38.0 mm (1.5 in)	27.5 mm (1.1 in)	40 years	44 of 100 (Notable)
24 May 1997	Bon Accord Dam, ZA	daily rain	35.0 mm (1.4 in)	15.9 mm (0.6 in)	63 years	39 of 100 (Notable)
15 February 1996	Bon Accord Dam, ZA	daily rain	44.0 mm (1.7 in)	5.5 mm (0.22 in)	20 years	16 of 100 (Routine)
25 January 1996	Bon Accord Dam, ZA	daily rain	52.0 mm (2.0 in)	2.0 mm (0.08 in)	20 years	14 of 100 (Routine)
22 December 1995	Bon Accord Dam, ZA	daily rain	62.0 mm (2.4 in)	11.5 mm (0.5 in)	5 years	17 of 100 (Routine)
18 November 1995	Bon Accord Dam, ZA	monthly rain	84.0 mm (3.3 in)	4.5 mm (0.18 in)	52 years	35 of 100 (Notable)
17 October 1995	Bon Accord Dam, ZA	daily rain	27.0 mm (1.1 in)	6.0 mm (0.24 in)	24 years	18 of 100 (Routine)
27 April 1995	Bon Accord Dam, ZA	daily rain	44.0 mm (1.7 in)	27.5 mm (1.1 in)	40 years	40 of 100 (Notable)
26 March 1995	Bon Accord Dam, ZA	daily rain	51.5 mm (2.0 in)	22.3 mm (0.9 in)	60 years	40 of 100 (Notable)
22 March 1995	Bon Accord Dam, ZA	daily rain	28.0 mm (1.1 in)	6.9 mm (0.27 in)	53 years	27 of 100 (Routine)
18 November 1994	Bon Accord Dam, ZA	daily rain	20.0 mm (0.8 in)	7.5 mm (0.30 in)	28 years	19 of 100 (Routine)
23 January 1994	Bon Accord Dam, ZA	daily rain	67.0 mm (2.6 in)	14.5 mm (0.6 in)	4 years	17 of 100 (Routine)
5 October 1993	Bon Accord Dam, ZA	daily rain	39.0 mm (1.5 in)	19.9 mm (0.8 in)	44 years	33 of 100 (Routine)
29 August 1993	Bon Accord Dam, ZA	daily rain (Tie)	6.0 mm (0.24 in)	tie	14 years	2 of 100 (Routine)
27 March 1993	Bon Accord Dam, ZA	daily rain	25.0 mm (1.0 in)	8.5 mm (0.33 in)	20 years	17 of 100 (Routine)
14 February 1993	Bon Accord Dam, ZA	daily rain	40.0 mm (1.6 in)	18.0 mm (0.7 in)	34 years	27 of 100 (Routine)
11 December 1992	Bon Accord Dam, ZA	daily rain	37.0 mm (1.5 in)	11.6 mm (0.5 in)	52 years	30 of 100 (Routine)
3 August 1992	Bon Accord Dam, ZA	daily rain	3.5 mm (0.14 in)	3.5 mm (0.14 in)	66 years	20 of 100 (Routine)
1 June 1991	Bon Accord Dam, ZA	daily rain (Tie)	2.5 mm (0.10 in)	tie	1 year	1 of 100 (Routine)

Extremes by Year

1926 to 1997

Yearly extremes at Bon Accord Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	131.0 mm (5.2 in)	1986	58.8 mm (2.3 in)	72
Wettest five days (Rx5day)	187.2 mm (7.4 in)	1937	91.8 mm (3.6 in)	72
Longest dry spell (CDD)	199 days	1965	103 days	72

Wettest day (Rx1day)

The wettest day of the year at Bon Accord Dam, 1926 to 1997. The record is 131.0 mm (5.2 in) in 1986, marked on the chart; the median year is 58.8 mm (2.3 in).

Wettest day (Rx1day) at Bon Accord Dam by year
Year	Wettest day (Rx1day)
1926	52.1 mm (2.1 in)
1927	40.1 mm (1.6 in)
1928	96.5 mm (3.8 in)
1929	69.9 mm (2.8 in)
1930	69.1 mm (2.7 in)
1931	40.4 mm (1.6 in)
1932	55.9 mm (2.2 in)
1933	64.8 mm (2.6 in)
1934	51.1 mm (2.0 in)
1935	52.1 mm (2.1 in)
1936	89.4 mm (3.5 in)
1937	125.7 mm (4.9 in)
1938	53.8 mm (2.1 in)
1939	58.9 mm (2.3 in)
1940	54.9 mm (2.2 in)
1941	48.8 mm (1.9 in)
1942	79.5 mm (3.1 in)
1943	57.2 mm (2.3 in)
1944	69.9 mm (2.8 in)
1945	59.2 mm (2.3 in)
1946	85.3 mm (3.4 in)
1947	62.5 mm (2.5 in)
1948	67.6 mm (2.7 in)
1949	34.3 mm (1.4 in)
1950	61.7 mm (2.4 in)
1951	53.3 mm (2.1 in)
1952	58.7 mm (2.3 in)
1953	58.0 mm (2.3 in)
1954	64.0 mm (2.5 in)
1955	76.0 mm (3.0 in)
1956	55.0 mm (2.2 in)
1957	85.0 mm (3.3 in)
1958	55.0 mm (2.2 in)
1959	55.0 mm (2.2 in)
1960	47.0 mm (1.9 in)
1961	54.0 mm (2.1 in)
1962	70.0 mm (2.8 in)
1963	34.0 mm (1.3 in)
1964	50.0 mm (2.0 in)
1965	87.5 mm (3.4 in)
1966	73.0 mm (2.9 in)
1967	87.0 mm (3.4 in)
1968	78.5 mm (3.1 in)
1969	72.5 mm (2.9 in)
1970	53.0 mm (2.1 in)
1971	83.0 mm (3.3 in)
1972	36.0 mm (1.4 in)
1973	45.0 mm (1.8 in)
1974	56.0 mm (2.2 in)
1975	78.0 mm (3.1 in)
1976	91.5 mm (3.6 in)
1977	74.0 mm (2.9 in)
1978	86.5 mm (3.4 in)
1979	56.0 mm (2.2 in)
1980	55.0 mm (2.2 in)
1981	66.0 mm (2.6 in)
1982	31.5 mm (1.2 in)
1983	101.0 mm (4.0 in)
1984	49.0 mm (1.9 in)
1985	110.5 mm (4.4 in)
1986	131.0 mm (5.2 in)
1987	40.0 mm (1.6 in)
1988	68.0 mm (2.7 in)
1989	56.5 mm (2.2 in)
1990	48.0 mm (1.9 in)
1991	74.5 mm (2.9 in)
1992	37.0 mm (1.5 in)
1993	57.0 mm (2.2 in)
1994	67.0 mm (2.6 in)
1995	84.0 mm (3.3 in)
1996	52.0 mm (2.0 in)
1997	38.0 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bon Accord Dam, 1926 to 1997. The record is 187.2 mm (7.4 in) in 1937, marked on the chart; the median year is 91.8 mm (3.6 in).

Wettest five days (Rx5day) at Bon Accord Dam by year
Year	Wettest five days (Rx5day)
1926	52.1 mm (2.1 in)
1927	88.4 mm (3.5 in)
1928	115.3 mm (4.5 in)
1929	80.6 mm (3.2 in)
1930	123.4 mm (4.9 in)
1931	68.9 mm (2.7 in)
1932	80.5 mm (3.2 in)
1933	138.0 mm (5.4 in)
1934	89.4 mm (3.5 in)
1935	75.5 mm (3.0 in)
1936	125.8 mm (5.0 in)
1937	187.2 mm (7.4 in)
1938	87.6 mm (3.4 in)
1939	132.9 mm (5.2 in)
1940	84.0 mm (3.3 in)
1941	71.4 mm (2.8 in)
1942	157.0 mm (6.2 in)
1943	121.4 mm (4.8 in)
1944	93.6 mm (3.7 in)
1945	94.5 mm (3.7 in)
1946	119.1 mm (4.7 in)
1947	89.4 mm (3.5 in)
1948	124.5 mm (4.9 in)
1949	70.2 mm (2.8 in)
1950	80.5 mm (3.2 in)
1951	85.1 mm (3.4 in)
1952	103.4 mm (4.1 in)
1953	80.0 mm (3.1 in)
1954	84.5 mm (3.3 in)
1955	123.5 mm (4.9 in)
1956	120.5 mm (4.7 in)
1957	91.0 mm (3.6 in)
1958	110.0 mm (4.3 in)
1959	77.0 mm (3.0 in)
1960	103.0 mm (4.1 in)
1961	100.0 mm (3.9 in)
1962	75.5 mm (3.0 in)
1963	72.0 mm (2.8 in)
1964	89.0 mm (3.5 in)
1965	103.5 mm (4.1 in)
1966	149.0 mm (5.9 in)
1967	136.5 mm (5.4 in)
1968	105.2 mm (4.1 in)
1969	121.0 mm (4.8 in)
1970	69.5 mm (2.7 in)
1971	92.5 mm (3.6 in)
1972	64.0 mm (2.5 in)
1973	72.5 mm (2.9 in)
1974	56.0 mm (2.2 in)
1975	166.8 mm (6.6 in)
1976	108.0 mm (4.3 in)
1977	83.0 mm (3.3 in)
1978	171.5 mm (6.8 in)
1979	70.0 mm (2.8 in)
1980	89.0 mm (3.5 in)
1981	107.0 mm (4.2 in)
1982	59.0 mm (2.3 in)
1983	136.0 mm (5.4 in)
1984	80.0 mm (3.1 in)
1985	163.5 mm (6.4 in)
1986	142.5 mm (5.6 in)
1987	58.5 mm (2.3 in)
1988	77.0 mm (3.0 in)
1989	106.0 mm (4.2 in)
1990	88.0 mm (3.5 in)
1991	154.5 mm (6.1 in)
1992	71.5 mm (2.8 in)
1993	78.0 mm (3.1 in)
1994	100.0 mm (3.9 in)
1995	119.0 mm (4.7 in)
1996	103.0 mm (4.1 in)
1997	91.0 mm (3.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bon Accord Dam, 1926 to 1997. The record is 199 days in 1965, marked on the chart; the median year is 103 days.

Longest dry spell (CDD) at Bon Accord Dam by year
Year	Longest dry spell (CDD)
1926	76 days
1927	92 days
1928	95 days
1929	93 days
1930	88 days
1931	87 days
1932	128 days
1933	71 days
1934	46 days
1935	103 days
1936	110 days
1937	117 days
1938	52 days
1939	44 days
1940	68 days
1941	103 days
1942	30 days
1943	47 days
1944	91 days
1945	139 days
1946	130 days
1947	89 days
1948	119 days
1949	107 days
1950	127 days
1951	100 days
1952	72 days
1953	143 days
1954	113 days
1955	120 days
1956	107 days
1957	54 days
1958	99 days
1959	161 days
1960	156 days
1961	107 days
1962	158 days
1963	102 days
1964	88 days
1965	199 days
1966	103 days
1967	75 days
1968	104 days
1969	114 days
1970	64 days
1971	73 days
1972	162 days
1973	110 days
1974	110 days
1975	176 days
1976	146 days
1977	108 days
1978	127 days
1979	59 days
1980	152 days
1981	49 days
1982	89 days
1983	44 days
1984	76 days
1985	110 days
1986	85 days
1987	119 days
1988	63 days
1989	52 days
1990	89 days
1991	110 days
1992	69 days
1993	122 days
1994	134 days
1995	120 days
1996	145 days
1997	95 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, 1926 to 1996

A day with at least 61.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 131.1 mm (5.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Bon Accord Dam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	61.3 mm (2.4 in)
5 years	79.6 mm (3.1 in)
10 years	91.9 mm (3.6 in)
25 years	107.5 mm (4.2 in)
50 years	119.3 mm (4.7 in)
100 years	131.1 mm (5.2 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 1926 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: 131.0 mm (5.2 in) in 1986; 125.7 mm (4.9 in) in 1937; 110.5 mm (4.4 in) in 1985.

Download the Data

Data for Bon Accord Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bon Accord Dam 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 2026-10-13 (13 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