Grantham Weather Records (SF000912880)

Record envelope, standing records and threshold days for Grantham (SF000912880), South Africa, with 86 years of record.

Key Facts for Grantham

Grantham (SF000912880) is a weather station in South Africa at -32.30 latitude and 22.17 longitude, 847 m (2,779 ft) above sea level.
The station reports from 1912 to 1997, 86 years of record.
0 records set at Grantham still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Grantham set a daily record precipitation of 23.0 mm (0.9 in) on 21 November 1996.

About the Station

Location: South Africa, -32.30 latitude, 22.17 longitude.
Elevation: 847 m (2,779 ft).
Period of record: 1912 to 1997, 86 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 Grantham. 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 Grantham, 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 Grantham still stand.

Wettest Day of Each Month

Apr: 105.4 mm (4.1 in)

The wettest day on record for each calendar month at Grantham. The most was 105.4 mm (4.1 in) on 4 April 1919.

Record daily precipitation for each month at Grantham
Month	Record daily precipitation (mm)	Date
Jan	40.4 mm (1.6 in)	31 January 1931
Feb	71.5 mm (2.8 in)	21 February 1974
Mar	69.9 mm (2.8 in)	29 March 1913
Apr	105.4 mm (4.1 in)	4 April 1919
May	78.6 mm (3.1 in)	26 May 1967
Jun	31.0 mm (1.2 in)	22 June 1953
Jul	47.2 mm (1.9 in)	19 July 1979
Aug	59.5 mm (2.3 in)	21 August 1971
Sep	61.5 mm (2.4 in)	15 September 1964
Oct	54.1 mm (2.1 in)	9 October 1913
Nov	52.5 mm (2.1 in)	2 November 1989
Dec	51.3 mm (2.0 in)	17 December 1937

Latest Records

Latest records at Grantham
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 November 1996	Grantham, ZA	daily rain	23.0 mm (0.9 in)	1.0 mm (0.04 in)	27 years	16 of 100 (Routine)
7 November 1996	Grantham, ZA	daily rain	21.0 mm (0.8 in)	9.6 mm (0.38 in)	77 years	20 of 100 (Routine)
4 August 1996	Grantham, ZA	daily rain	25.5 mm (1.0 in)	15.8 mm (0.6 in)	56 years	39 of 100 (Notable)
29 February 1996	Grantham, ZA	daily rain	16.0 mm (0.6 in)	12.0 mm (0.5 in)	8 years	20 of 100 (Routine)
24 January 1996	Grantham, ZA	daily rain	24.5 mm (1.0 in)	8.8 mm (0.35 in)	40 years	20 of 100 (Routine)
13 December 1995	Grantham, ZA	daily rain	10.5 mm (0.4 in)	3.0 mm (0.12 in)	5 years	11 of 100 (Routine)
17 September 1995	Grantham, ZA	daily rain	2.0 mm (0.08 in)	2.0 mm (0.08 in)	82 years	20 of 100 (Routine)
20 August 1995	Grantham, ZA	daily rain	12.5 mm (0.5 in)	6.1 mm (0.24 in)	52 years	20 of 100 (Routine)
4 June 1995	Grantham, ZA	daily rain	5.5 mm (0.22 in)	5.1 mm (0.20 in)	0 years	17 of 100 (Routine)
25 July 1994	Grantham, ZA	daily rain	16.0 mm (0.6 in)	13.5 mm (0.5 in)	28 years	20 of 100 (Routine)
4 June 1994	Grantham, ZA	daily rain	0.4 mm (0.02 in)	0.4 mm (0.02 in)	81 years	20 of 100 (Routine)
20 April 1994	Grantham, ZA	daily rain	17.0 mm (0.7 in)	5.5 mm (0.22 in)	4 years	13 of 100 (Routine)
20 March 1994	Grantham, ZA	daily rain	26.0 mm (1.0 in)	8.2 mm (0.32 in)	44 years	28 of 100 (Routine)
2 March 1994	Grantham, ZA	daily rain	33.0 mm (1.3 in)	9.9 mm (0.39 in)	77 years	40 of 100 (Notable)
8 February 1994	Grantham, ZA	daily rain	15.0 mm (0.6 in)	3.0 mm (0.12 in)	8 years	12 of 100 (Routine)
18 January 1994	Grantham, ZA	daily rain	20.0 mm (0.8 in)	16.0 mm (0.6 in)	32 years	20 of 100 (Routine)
5 January 1994	Grantham, ZA	daily rain	22.4 mm (0.9 in)	2.4 mm (0.09 in)	22 years	16 of 100 (Routine)
19 October 1993	Grantham, ZA	daily rain	11.0 mm (0.4 in)	7.5 mm (0.30 in)	24 years	20 of 100 (Routine)
23 September 1993	Grantham, ZA	daily rain	15.5 mm (0.6 in)	10.3 mm (0.4 in)	2 years	16 of 100 (Routine)
3 August 1993	Grantham, ZA	daily rain	5.0 mm (0.20 in)	2.0 mm (0.08 in)	32 years	18 of 100 (Routine)

Extremes by Year

1912 to 1997

Yearly extremes at Grantham: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	105.4 mm (4.1 in)	1919	32.4 mm (1.3 in)	86
Wettest five days (Rx5day)	110.5 mm (4.4 in)	1970	40.6 mm (1.6 in)	86
Longest dry spell (CDD)	293 days	1997	76 days	86

Wettest day (Rx1day)

The wettest day of the year at Grantham, 1912 to 1997. The record is 105.4 mm (4.1 in) in 1919, marked on the chart; the median year is 32.4 mm (1.3 in).

Wettest day (Rx1day) at Grantham by year
Year	Wettest day (Rx1day)
1912	25.4 mm (1.0 in)
1913	69.9 mm (2.8 in)
1914	33.8 mm (1.3 in)
1915	25.4 mm (1.0 in)
1916	25.4 mm (1.0 in)
1917	25.4 mm (1.0 in)
1918	29.2 mm (1.1 in)
1919	105.4 mm (4.1 in)
1920	40.6 mm (1.6 in)
1921	40.6 mm (1.6 in)
1922	39.1 mm (1.5 in)
1923	26.2 mm (1.0 in)
1924	36.8 mm (1.4 in)
1925	27.4 mm (1.1 in)
1926	28.4 mm (1.1 in)
1927	25.1 mm (1.0 in)
1928	59.9 mm (2.4 in)
1929	19.8 mm (0.8 in)
1930	41.9 mm (1.6 in)
1931	50.8 mm (2.0 in)
1932	14.0 mm (0.6 in)
1933	33.8 mm (1.3 in)
1934	19.1 mm (0.8 in)
1935	17.0 mm (0.7 in)
1936	20.6 mm (0.8 in)
1937	51.3 mm (2.0 in)
1938	35.8 mm (1.4 in)
1939	36.1 mm (1.4 in)
1940	48.0 mm (1.9 in)
1941	52.8 mm (2.1 in)
1942	21.1 mm (0.8 in)
1943	21.6 mm (0.9 in)
1944	20.3 mm (0.8 in)
1945	38.4 mm (1.5 in)
1946	32.3 mm (1.3 in)
1947	29.7 mm (1.2 in)
1948	40.6 mm (1.6 in)
1949	48.0 mm (1.9 in)
1950	47.0 mm (1.9 in)
1951	22.1 mm (0.9 in)
1952	21.8 mm (0.9 in)
1953	31.3 mm (1.2 in)
1954	39.6 mm (1.6 in)
1955	37.0 mm (1.5 in)
1956	50.0 mm (2.0 in)
1957	49.5 mm (1.9 in)
1958	14.0 mm (0.6 in)
1959	20.0 mm (0.8 in)
1960	18.5 mm (0.7 in)
1961	43.1 mm (1.7 in)
1962	23.0 mm (0.9 in)
1963	62.0 mm (2.4 in)
1964	61.5 mm (2.4 in)
1965	14.5 mm (0.6 in)
1966	25.5 mm (1.0 in)
1967	78.6 mm (3.1 in)
1968	27.5 mm (1.1 in)
1969	32.5 mm (1.3 in)
1970	45.5 mm (1.8 in)
1971	59.5 mm (2.3 in)
1972	20.0 mm (0.8 in)
1973	35.0 mm (1.4 in)
1974	71.5 mm (2.8 in)
1975	55.0 mm (2.2 in)
1976	43.0 mm (1.7 in)
1977	46.4 mm (1.8 in)
1978	28.5 mm (1.1 in)
1979	47.2 mm (1.9 in)
1980	60.0 mm (2.4 in)
1981	62.0 mm (2.4 in)
1982	29.0 mm (1.1 in)
1983	28.5 mm (1.1 in)
1984	17.5 mm (0.7 in)
1985	21.0 mm (0.8 in)
1986	18.0 mm (0.7 in)
1987	35.5 mm (1.4 in)
1988	32.5 mm (1.3 in)
1989	72.0 mm (2.8 in)
1990	14.5 mm (0.6 in)
1991	19.0 mm (0.7 in)
1992	24.0 mm (0.9 in)
1993	32.0 mm (1.3 in)
1994	33.0 mm (1.3 in)
1995	25.0 mm (1.0 in)
1996	25.5 mm (1.0 in)
1997	7.5 mm (0.30 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grantham, 1912 to 1997. The record is 110.5 mm (4.4 in) in 1970, marked on the chart; the median year is 40.6 mm (1.6 in).

Wettest five days (Rx5day) at Grantham by year
Year	Wettest five days (Rx5day)
1912	31.8 mm (1.3 in)
1913	69.9 mm (2.8 in)
1914	33.8 mm (1.3 in)
1915	38.4 mm (1.5 in)
1916	25.4 mm (1.0 in)
1917	36.9 mm (1.5 in)
1918	33.5 mm (1.3 in)
1919	105.4 mm (4.1 in)
1920	49.5 mm (1.9 in)
1921	76.9 mm (3.0 in)
1922	40.6 mm (1.6 in)
1923	26.2 mm (1.0 in)
1924	42.2 mm (1.7 in)
1925	27.4 mm (1.1 in)
1926	28.4 mm (1.1 in)
1927	27.1 mm (1.1 in)
1928	89.4 mm (3.5 in)
1929	33.5 mm (1.3 in)
1930	41.9 mm (1.6 in)
1931	50.8 mm (2.0 in)
1932	50.8 mm (2.0 in)
1933	38.3 mm (1.5 in)
1934	31.1 mm (1.2 in)
1935	32.8 mm (1.3 in)
1936	26.1 mm (1.0 in)
1937	64.0 mm (2.5 in)
1938	35.8 mm (1.4 in)
1939	36.1 mm (1.4 in)
1940	51.8 mm (2.0 in)
1941	69.8 mm (2.7 in)
1942	24.1 mm (0.9 in)
1943	33.0 mm (1.3 in)
1944	22.3 mm (0.9 in)
1945	38.4 mm (1.5 in)
1946	38.8 mm (1.5 in)
1947	35.8 mm (1.4 in)
1948	52.1 mm (2.1 in)
1949	81.8 mm (3.2 in)
1950	65.6 mm (2.6 in)
1951	69.8 mm (2.7 in)
1952	62.5 mm (2.5 in)
1953	47.1 mm (1.9 in)
1954	39.6 mm (1.6 in)
1955	45.9 mm (1.8 in)
1956	50.0 mm (2.0 in)
1957	51.5 mm (2.0 in)
1958	14.0 mm (0.6 in)
1959	36.0 mm (1.4 in)
1960	20.0 mm (0.8 in)
1961	84.7 mm (3.3 in)
1962	23.0 mm (0.9 in)
1963	64.0 mm (2.5 in)
1964	61.5 mm (2.4 in)
1965	30.0 mm (1.2 in)
1966	27.5 mm (1.1 in)
1967	78.6 mm (3.1 in)
1968	40.5 mm (1.6 in)
1969	51.5 mm (2.0 in)
1970	110.5 mm (4.4 in)
1971	88.0 mm (3.5 in)
1972	26.5 mm (1.0 in)
1973	62.6 mm (2.5 in)
1974	73.1 mm (2.9 in)
1975	65.5 mm (2.6 in)
1976	46.5 mm (1.8 in)
1977	62.9 mm (2.5 in)
1978	40.5 mm (1.6 in)
1979	74.5 mm (2.9 in)
1980	65.0 mm (2.6 in)
1981	74.5 mm (2.9 in)
1982	41.4 mm (1.6 in)
1983	42.0 mm (1.7 in)
1984	22.0 mm (0.9 in)
1985	33.7 mm (1.3 in)
1986	28.2 mm (1.1 in)
1987	38.7 mm (1.5 in)
1988	52.5 mm (2.1 in)
1989	72.0 mm (2.8 in)
1990	28.4 mm (1.1 in)
1991	24.2 mm (1.0 in)
1992	30.5 mm (1.2 in)
1993	45.0 mm (1.8 in)
1994	42.5 mm (1.7 in)
1995	27.6 mm (1.1 in)
1996	39.0 mm (1.5 in)
1997	7.5 mm (0.30 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grantham, 1912 to 1997. The record is 293 days in 1997, marked on the chart; the median year is 76 days.

Longest dry spell (CDD) at Grantham by year
Year	Longest dry spell (CDD)
1912	189 days
1913	83 days
1914	68 days
1915	165 days
1916	207 days
1917	39 days
1918	72 days
1919	124 days
1920	171 days
1921	140 days
1922	78 days
1923	110 days
1924	119 days
1925	40 days
1926	103 days
1927	88 days
1928	114 days
1929	39 days
1930	149 days
1931	68 days
1932	91 days
1933	113 days
1934	72 days
1935	60 days
1936	66 days
1937	103 days
1938	58 days
1939	120 days
1940	90 days
1941	173 days
1942	104 days
1943	52 days
1944	71 days
1945	118 days
1946	68 days
1947	52 days
1948	76 days
1949	56 days
1950	50 days
1951	187 days
1952	44 days
1953	33 days
1954	48 days
1955	138 days
1956	149 days
1957	77 days
1958	54 days
1959	73 days
1960	85 days
1961	100 days
1962	97 days
1963	64 days
1964	89 days
1965	50 days
1966	69 days
1967	132 days
1968	60 days
1969	53 days
1970	101 days
1971	51 days
1972	135 days
1973	63 days
1974	75 days
1975	68 days
1976	79 days
1977	92 days
1978	68 days
1979	77 days
1980	65 days
1981	46 days
1982	44 days
1983	59 days
1984	75 days
1985	107 days
1986	68 days
1987	79 days
1988	61 days
1989	75 days
1990	138 days
1991	90 days
1992	53 days
1993	56 days
1994	93 days
1995	64 days
1996	71 days
1997	293 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

81 years, 1912 to 1997

A day with at least 32.1 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 97.6 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Grantham: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	32.1 mm (1.3 in)
5 years	47.1 mm (1.9 in)
10 years	57.9 mm (2.3 in)
25 years	72.9 mm (2.9 in)
50 years	84.9 mm (3.3 in)
100 years	97.6 mm (3.8 in)	Longer than the 81 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, 81 years of values from 1912 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: 105.4 mm (4.1 in) in 1919; 78.6 mm (3.1 in) in 1967; 72.0 mm (2.8 in) in 1989.

Download the Data

Data for Grantham standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grantham 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