Derby Weather Records (SF005110840)

Record envelope, standing records and threshold days for Derby (SF005110840), South Africa, with 93 years of record.

Key Facts for Derby

Derby (SF005110840) is a weather station in South Africa at -25.90 latitude and 27.05 longitude, 1,585 m (5,200 ft) above sea level.
The station reports from 1905 to 1997, 93 years of record.
0 records set at Derby still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Derby set a daily record precipitation of 23.5 mm (0.9 in) on 14 October 1997.

About the Station

Location: South Africa, -25.90 latitude, 27.05 longitude.
Elevation: 1,585 m (5,200 ft).
Period of record: 1905 to 1997, 93 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 Derby. 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 Derby, 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 Derby still stand.

All-Time Record Progression

2 new records

2 all-time records were set at Derby between 2 February 1944 and 19 March 1976. Each dot is a new record.

When Derby set new all-time records
Date	Kind	Detail
1944-02-02	Record daily precipitation	Record daily precipitation 128.8 mm (5.1 in)
1976-03-19	Record daily precipitation	Record daily precipitation 130.0 mm (5.1 in)

Wettest Day of Each Month

Mar: 130.0 mm (5.1 in)

The wettest day on record for each calendar month at Derby. The most was 130.0 mm (5.1 in) on 19 March 1976.

Record daily precipitation for each month at Derby
Month	Record daily precipitation (mm)	Date
Jan	99.1 mm (3.9 in)	12 January 1928
Feb	128.8 mm (5.1 in)	2 February 1944
Mar	130.0 mm (5.1 in)	19 March 1976
Apr	81.5 mm (3.2 in)	4 April 1938
May	80.5 mm (3.2 in)	25 May 1997
Jun	60.0 mm (2.4 in)	11 June 1957
Jul	56.1 mm (2.2 in)	3 July 1943
Aug	59.7 mm (2.4 in)	31 August 1918
Sep	72.6 mm (2.9 in)	24 September 1940
Oct	78.5 mm (3.1 in)	18 October 1969
Nov	82.6 mm (3.3 in)	3 November 1939
Dec	119.9 mm (4.7 in)	16 December 1914

Latest Records

Latest records at Derby
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
14 October 1997	Derby, ZA	daily rain	23.5 mm (0.9 in)	7.0 mm (0.28 in)	79 years	20 of 100 (Routine)
10 September 1997	Derby, ZA	daily rain	16.0 mm (0.6 in)	3.6 mm (0.14 in)	72 years	20 of 100 (Routine)
27 July 1997	Derby, ZA	daily rain	11.0 mm (0.4 in)	10.5 mm (0.4 in)	86 years	20 of 100 (Routine)
26 May 1997	Derby, ZA	daily rain	37.0 mm (1.5 in)	31.7 mm (1.2 in)	63 years	55 of 100 (Notable)
25 May 1997	Derby, ZA	monthly rain	80.5 mm (3.2 in)	5.6 mm (0.22 in)	61 years	41 of 100 (Notable)
26 March 1997	Derby, ZA	daily rain	24.0 mm (0.9 in)	1.0 mm (0.04 in)	2 years	9 of 100 (Routine)
10 January 1997	Derby, ZA	daily rain	47.0 mm (1.9 in)	13.2 mm (0.5 in)	74 years	41 of 100 (Notable)
13 March 1996	Derby, ZA	daily rain (Tie)	25.0 mm (1.0 in)	tie	36 years	4 of 100 (Routine)
3 March 1996	Derby, ZA	daily rain (Tie)	30.0 mm (1.2 in)	tie	9 years	2 of 100 (Routine)
15 February 1996	Derby, ZA	daily rain	37.5 mm (1.5 in)	7.0 mm (0.28 in)	58 years	31 of 100 (Routine)
24 January 1996	Derby, ZA	daily rain	33.0 mm (1.3 in)	2.0 mm (0.08 in)	17 years	15 of 100 (Routine)
18 November 1995	Derby, ZA	daily rain	37.0 mm (1.5 in)	5.8 mm (0.23 in)	88 years	39 of 100 (Notable)
17 November 1995	Derby, ZA	daily rain	36.5 mm (1.4 in)	2.2 mm (0.09 in)	69 years	30 of 100 (Routine)
29 March 1995	Derby, ZA	daily rain	37.5 mm (1.5 in)	17.2 mm (0.7 in)	64 years	40 of 100 (Notable)
26 March 1995	Derby, ZA	daily rain	23.0 mm (0.9 in)	8.0 mm (0.31 in)	41 years	20 of 100 (Routine)
9 January 1995	Derby, ZA	daily rain	40.5 mm (1.6 in)	7.5 mm (0.30 in)	68 years	34 of 100 (Routine)
26 December 1994	Derby, ZA	daily rain	38.5 mm (1.5 in)	15.1 mm (0.6 in)	84 years	45 of 100 (Notable)
5 February 1994	Derby, ZA	daily rain	43.0 mm (1.7 in)	15.1 mm (0.6 in)	59 years	37 of 100 (Notable)
23 February 1993	Derby, ZA	daily rain	59.6 mm (2.3 in)	25.6 mm (1.0 in)	17 years	32 of 100 (Routine)
21 December 1992	Derby, ZA	daily rain	43.0 mm (1.7 in)	0.5 mm (0.02 in)	32 years	17 of 100 (Routine)

Extremes by Year

1905 to 1997

Yearly extremes at Derby: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	130.0 mm (5.1 in)	1976	59.5 mm (2.3 in)	87
Wettest five days (Rx5day)	266.7 mm (10.5 in)	1944	98.5 mm (3.9 in)	87
Longest dry spell (CDD)	177 days	1994	97 days	87

Wettest day (Rx1day)

The wettest day of the year at Derby, 1905 to 1997. The record is 130.0 mm (5.1 in) in 1976, marked on the chart; the median year is 59.5 mm (2.3 in).

Wettest day (Rx1day) at Derby by year
Year	Wettest day (Rx1day)
1905	32.5 mm (1.3 in)
1906	48.3 mm (1.9 in)
1907	62.2 mm (2.4 in)
1908	39.9 mm (1.6 in)
1909	55.1 mm (2.2 in)
1910	49.0 mm (1.9 in)
1911	47.0 mm (1.9 in)
1912	48.0 mm (1.9 in)
1913	55.1 mm (2.2 in)
1914	119.9 mm (4.7 in)
1915	48.3 mm (1.9 in)
1916	39.9 mm (1.6 in)
1917	39.4 mm (1.6 in)
1918	59.7 mm (2.4 in)
1919	38.1 mm (1.5 in)
1920	63.5 mm (2.5 in)
1921	73.7 mm (2.9 in)
1922	41.1 mm (1.6 in)
1923	43.4 mm (1.7 in)
1924	64.5 mm (2.5 in)
1925	74.9 mm (2.9 in)
1926	59.7 mm (2.4 in)
1927	49.5 mm (1.9 in)
1928	99.1 mm (3.9 in)
1929	62.0 mm (2.4 in)
1930	76.7 mm (3.0 in)
1931	61.0 mm (2.4 in)
1932	47.5 mm (1.9 in)
1933	79.5 mm (3.1 in)
1934	55.6 mm (2.2 in)
1935	56.1 mm (2.2 in)
1936	79.2 mm (3.1 in)
1937	63.5 mm (2.5 in)
1938	81.5 mm (3.2 in)
1939	82.6 mm (3.3 in)
1940	72.6 mm (2.9 in)
1941	41.9 mm (1.6 in)
1943	73.9 mm (2.9 in)
1944	128.8 mm (5.1 in)
1945	85.9 mm (3.4 in)
1946	57.4 mm (2.3 in)
1949	75.9 mm (3.0 in)
1950	76.7 mm (3.0 in)
1951	52.3 mm (2.1 in)
1952	33.3 mm (1.3 in)
1953	65.3 mm (2.6 in)
1954	61.5 mm (2.4 in)
1955	81.5 mm (3.2 in)
1956	48.7 mm (1.9 in)
1957	60.0 mm (2.4 in)
1958	87.2 mm (3.4 in)
1959	62.5 mm (2.5 in)
1960	42.5 mm (1.7 in)
1961	62.5 mm (2.5 in)
1962	40.5 mm (1.6 in)
1963	40.5 mm (1.6 in)
1964	68.0 mm (2.7 in)
1965	56.5 mm (2.2 in)
1967	59.5 mm (2.3 in)
1968	27.5 mm (1.1 in)
1969	78.5 mm (3.1 in)
1970	40.0 mm (1.6 in)
1971	65.5 mm (2.6 in)
1974	51.0 mm (2.0 in)
1975	76.0 mm (3.0 in)
1976	130.0 mm (5.1 in)
1977	57.3 mm (2.3 in)
1978	41.5 mm (1.6 in)
1979	45.0 mm (1.8 in)
1980	65.0 mm (2.6 in)
1981	40.0 mm (1.6 in)
1982	37.0 mm (1.5 in)
1983	60.0 mm (2.4 in)
1984	35.0 mm (1.4 in)
1985	94.0 mm (3.7 in)
1986	44.0 mm (1.7 in)
1987	43.0 mm (1.7 in)
1988	75.0 mm (3.0 in)
1989	59.0 mm (2.3 in)
1990	30.0 mm (1.2 in)
1991	68.0 mm (2.7 in)
1992	55.4 mm (2.2 in)
1993	59.6 mm (2.3 in)
1994	43.0 mm (1.7 in)
1995	62.0 mm (2.4 in)
1996	42.0 mm (1.7 in)
1997	80.5 mm (3.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Derby, 1905 to 1997. The record is 266.7 mm (10.5 in) in 1944, marked on the chart; the median year is 98.5 mm (3.9 in).

Wettest five days (Rx5day) at Derby by year
Year	Wettest five days (Rx5day)
1905	46.5 mm (1.8 in)
1906	65.0 mm (2.6 in)
1907	113.7 mm (4.5 in)
1908	63.5 mm (2.5 in)
1909	119.9 mm (4.7 in)
1910	76.1 mm (3.0 in)
1911	63.5 mm (2.5 in)
1912	81.2 mm (3.2 in)
1913	81.2 mm (3.2 in)
1914	217.4 mm (8.6 in)
1915	120.2 mm (4.7 in)
1916	62.8 mm (2.5 in)
1917	68.9 mm (2.7 in)
1918	118.2 mm (4.7 in)
1919	94.1 mm (3.7 in)
1920	96.5 mm (3.8 in)
1921	144.0 mm (5.7 in)
1922	51.5 mm (2.0 in)
1923	84.0 mm (3.3 in)
1924	107.8 mm (4.2 in)
1925	88.5 mm (3.5 in)
1926	65.6 mm (2.6 in)
1927	54.9 mm (2.2 in)
1928	144.3 mm (5.7 in)
1929	85.4 mm (3.4 in)
1930	100.6 mm (4.0 in)
1931	106.7 mm (4.2 in)
1932	77.2 mm (3.0 in)
1933	104.7 mm (4.1 in)
1934	117.8 mm (4.6 in)
1935	104.9 mm (4.1 in)
1936	133.4 mm (5.3 in)
1937	118.3 mm (4.7 in)
1938	108.4 mm (4.3 in)
1939	144.3 mm (5.7 in)
1940	147.0 mm (5.8 in)
1941	65.0 mm (2.6 in)
1943	144.7 mm (5.7 in)
1944	266.7 mm (10.5 in)
1945	260.3 mm (10.2 in)
1946	102.9 mm (4.1 in)
1949	88.0 mm (3.5 in)
1950	78.0 mm (3.1 in)
1951	98.1 mm (3.9 in)
1952	69.6 mm (2.7 in)
1953	96.9 mm (3.8 in)
1954	100.2 mm (3.9 in)
1955	133.0 mm (5.2 in)
1956	123.5 mm (4.9 in)
1957	76.5 mm (3.0 in)
1958	162.2 mm (6.4 in)
1959	69.0 mm (2.7 in)
1960	126.0 mm (5.0 in)
1961	113.5 mm (4.5 in)
1962	91.2 mm (3.6 in)
1963	65.2 mm (2.6 in)
1964	74.5 mm (2.9 in)
1965	86.0 mm (3.4 in)
1967	116.0 mm (4.6 in)
1968	83.0 mm (3.3 in)
1969	99.3 mm (3.9 in)
1970	68.0 mm (2.7 in)
1971	99.0 mm (3.9 in)
1974	100.0 mm (3.9 in)
1975	140.0 mm (5.5 in)
1976	198.5 mm (7.8 in)
1977	88.0 mm (3.5 in)
1978	121.1 mm (4.8 in)
1979	83.0 mm (3.3 in)
1980	98.5 mm (3.9 in)
1981	101.0 mm (4.0 in)
1982	87.5 mm (3.4 in)
1983	60.0 mm (2.4 in)
1984	72.5 mm (2.9 in)
1985	220.5 mm (8.7 in)
1986	119.5 mm (4.7 in)
1987	82.5 mm (3.2 in)
1988	131.0 mm (5.2 in)
1989	85.5 mm (3.4 in)
1990	58.5 mm (2.3 in)
1991	148.0 mm (5.8 in)
1992	95.5 mm (3.8 in)
1993	63.8 mm (2.5 in)
1994	66.0 mm (2.6 in)
1995	118.5 mm (4.7 in)
1996	114.5 mm (4.5 in)
1997	156.5 mm (6.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Derby, 1905 to 1997. The record is 177 days in 1994, marked on the chart; the median year is 97 days.

Longest dry spell (CDD) at Derby by year
Year	Longest dry spell (CDD)
1905	124 days
1906	102 days
1907	39 days
1908	110 days
1909	77 days
1910	68 days
1911	62 days
1912	152 days
1913	60 days
1914	72 days
1915	52 days
1916	168 days
1917	50 days
1918	84 days
1919	99 days
1920	122 days
1921	111 days
1922	69 days
1923	75 days
1924	126 days
1925	50 days
1926	75 days
1927	79 days
1928	78 days
1929	93 days
1930	58 days
1931	104 days
1932	111 days
1933	71 days
1934	75 days
1935	107 days
1936	140 days
1937	135 days
1938	30 days
1939	43 days
1940	67 days
1941	132 days
1943	55 days
1944	95 days
1945	135 days
1946	14 days
1949	27 days
1950	107 days
1951	105 days
1952	73 days
1953	151 days
1954	114 days
1955	121 days
1956	108 days
1957	39 days
1958	145 days
1959	147 days
1960	39 days
1961	60 days
1962	158 days
1963	99 days
1964	88 days
1965	74 days
1967	74 days
1968	93 days
1969	120 days
1970	107 days
1971	53 days
1974	121 days
1975	101 days
1976	145 days
1977	126 days
1978	123 days
1979	45 days
1980	112 days
1981	114 days
1982	81 days
1983	43 days
1984	79 days
1985	136 days
1986	122 days
1987	123 days
1988	66 days
1989	103 days
1990	118 days
1991	102 days
1992	55 days
1993	140 days
1994	177 days
1995	97 days
1996	61 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

77 years, 1906 to 1997

A day with at least 56.5 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 121.3 mm (4.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Derby: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	56.5 mm (2.2 in)
5 years	73.8 mm (2.9 in)
10 years	85.3 mm (3.4 in)
25 years	99.8 mm (3.9 in)
50 years	110.6 mm (4.4 in)
100 years	121.3 mm (4.8 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 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: 130.0 mm (5.1 in) in 1976; 128.8 mm (5.1 in) in 1944; 99.1 mm (3.9 in) in 1928.

Download the Data

Data for Derby standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Derby 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 2026-10-16 (16 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