Grootfontein Weather Records (WA010101860)

Record envelope, standing records and threshold days for Grootfontein (WA010101860), Namibia, with 109 years of record.

Key Facts for Grootfontein

Grootfontein (WA010101860) is a weather station in Namibia at -19.60 latitude and 18.12 longitude, 1,400 m (4,593 ft) above sea level.
The station reports from 1917 to 2025, 109 years of record.
1,464 records set at Grootfontein still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Grootfontein set a daily record low minimum temperature of -2.9 C (26.8 F) on 7 August 2025.

About the Station

Location: Namibia, -19.60 latitude, 18.12 longitude.
Elevation: 1,400 m (4,593 ft).
Period of record: 1917 to 2025, 109 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

8 days at or beyond a record

The band shows the record high and record low for each calendar day at Grootfontein. The lines show the 2026 daily maximum and minimum. 8 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Grootfontein, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	40.1 C (104.2 F)	11.6 C (52.9 F)	34.9 C (94.8 F)	12.5 C (54.5 F)
Feb	39.8 C (103.6 F)	9.3 C (48.7 F)	31.2 C (88.2 F)	15.3 C (59.5 F)
Mar	39.0 C (102.2 F)	5.5 C (41.9 F)	31.9 C (89.4 F)	13.9 C (57.0 F)
Apr	39.3 C (102.7 F)	4.2 C (39.6 F)	31.0 C (87.8 F)	11.9 C (53.4 F)
May	32.7 C (90.9 F)	-1.0 C (30.2 F)	28.5 C (83.3 F)	3.6 C (38.5 F)
Jun	31.2 C (88.2 F)	-5.0 C (23.0 F)	26.4 C (79.5 F)	-4.0 C (24.8 F)
Jul	31.6 C (88.9 F)	-5.6 C (21.9 F)	27.7 C (81.9 F)	0.9 C (33.6 F)
Aug	34.8 C (94.6 F)	-4.9 C (23.2 F)	32.8 C (91.0 F)	-3.4 C (25.9 F)
Sep	37.3 C (99.1 F)	-1.2 C (29.8 F)	n/a	n/a
Oct	39.3 C (102.7 F)	6.3 C (43.3 F)	n/a	n/a
Nov	40.8 C (105.4 F)	6.5 C (43.7 F)	n/a	n/a
Dec	46.2 C (115.2 F)	7.5 C (45.5 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Grootfontein still stand. 2024 holds the most, with 96.

Standing records at Grootfontein by the year they were set
Year set	Standing records
1975	2
1976	22
1979	2
1980	7
1981	10
1982	13
1983	27
1984	16
1985	23
1986	13
1987	23
1988	8
1989	34
1990	20
1991	54
1992	44
1993	44
1994	35
1995	43
1996	32
1997	54
1998	53
1999	40
2000	26
2001	27
2002	33
2003	41
2004	15
2005	25
2006	29
2007	5
2008	17
2009	12
2010	32
2011	15
2012	34
2013	45
2014	25
2015	72
2016	75
2017	23
2018	14
2019	29
2020	2
2021	39
2022	43
2023	62
2024	96
2025	9

All-Time Record Progression

6 new records

6 all-time records were set at Grootfontein between 28 December 1957 and 24 July 2021. Each dot is a new record.

When Grootfontein set new all-time records
Date	Kind	Detail
1957-12-28	Record daily precipitation	Record daily precipitation 116.0 mm (4.6 in)
1978-01-24	Record daily precipitation	Record daily precipitation 199.9 mm (7.9 in)
2015-11-11	Record high maximum temperature	Record high maximum temperature 40.8 C (105.4 F)
2016-12-29	Record high maximum temperature	Record high maximum temperature 46.2 C (115.2 F)
2017-12-26	Record high minimum temperature	Record high minimum temperature 26.2 C (79.2 F)
2021-07-24	Record low minimum temperature	Record low minimum temperature -5.6 C (21.9 F)

Wettest Day of Each Month

Jan: 199.9 mm (7.9 in)

The wettest day on record for each calendar month at Grootfontein. The most was 199.9 mm (7.9 in) on 24 January 1978.

Record daily precipitation for each month at Grootfontein
Month	Record daily precipitation (mm)	Date
Jan	199.9 mm (7.9 in)	24 January 1978
Feb	111.0 mm (4.4 in)	8 February 1923
Mar	112.5 mm (4.4 in)	5 March 1982
Apr	86.0 mm (3.4 in)	5 April 2001
May	29.0 mm (1.1 in)	15 May 2025
Jun	24.9 mm (1.0 in)	30 June 1986
Jul	25.7 mm (1.0 in)	20 July 1987
Aug	37.0 mm (1.5 in)	7 August 1962
Sep	41.0 mm (1.6 in)	18 September 1966
Oct	76.0 mm (3.0 in)	26 October 2000
Nov	74.0 mm (2.9 in)	21 November 1967
Dec	116.0 mm (4.6 in)	28 December 1957

Period of Record Coverage

1974 to 2025

48 years of record at Grootfontein, 1974 to 2025. 28 years have data for under 90 percent of days and are left out of rankings: 1974, 1975, 1976, 1977, 1983, 1986, 1987, 1988 and others.

Days with data per year at Grootfontein
Year	Days with data	Share of year	Complete
1974	8	2%	No
1975	102	28%	No
1976	241	66%	No
1977	23	6%	No
1982	357	98%	Yes
1983	325	89%	No
1984	340	93%	Yes
1985	337	92%	Yes
1986	320	88%	No
1987	260	71%	No
1988	271	74%	No
1989	360	99%	Yes
1990	298	82%	No
1991	364	100%	Yes
1992	365	100%	Yes
1993	363	99%	Yes
1994	362	99%	Yes
1995	365	100%	Yes
1996	350	96%	Yes
1997	363	99%	Yes
1998	365	100%	Yes
1999	364	100%	Yes
2000	342	93%	Yes
2001	361	99%	Yes
2002	362	99%	Yes
2003	359	98%	Yes
2004	120	33%	No
2005	238	65%	No
2006	193	53%	No
2007	167	46%	No
2008	250	68%	No
2009	162	44%	No
2010	260	71%	No
2011	196	54%	No
2012	284	78%	No
2013	300	82%	No
2014	335	92%	Yes
2015	271	74%	No
2016	242	66%	No
2017	128	35%	No
2018	119	33%	No
2019	187	51%	No
2020	32	9%	No
2021	316	87%	No
2022	352	96%	Yes
2023	326	89%	No
2024	331	90%	Yes
2025	191	52%	No

Latest Records

Latest records at Grootfontein
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
7 August 2025	Grootfontein, NA	daily low min	-2.9 C (26.8 F)	3.9 C (7.0 F)	30 years	24 of 100 (Routine)
7 August 2025	Grootfontein, NA	daily low max	20.9 C (69.6 F)	1.3 C (2.3 F)	24 years	16 of 100 (Routine)
8 July 2025	Grootfontein, NA	daily low min	0.9 C (33.6 F)	0.1 C (0.2 F)	28 years	13 of 100 (Routine)
29 June 2025	Grootfontein, NA	daily low min (Tie)	-2.7 C (27.1 F)	tie	31 years	3 of 100 (Routine)
28 June 2025	Grootfontein, NA	daily low min	-4.0 C (24.8 F)	0.8 C (1.4 F)	2 years	7 of 100 (Routine)
27 June 2025	Grootfontein, NA	daily low min	-0.5 C (31.1 F)	2.0 C (3.6 F)	18 years	15 of 100 (Routine)
10 June 2025	Grootfontein, NA	daily low min	-2.6 C (27.3 F)	1.7 C (3.1 F)	3 years	9 of 100 (Routine)
15 May 2025	Grootfontein, NA	monthly rain	29.0 mm (1.1 in)	1.0 mm (0.04 in)	74 years	43 of 100 (Notable)
13 May 2025	Grootfontein, NA	daily low min	4.4 C (39.9 F)	1.0 C (1.8 F)	4 years	8 of 100 (Routine)
4 April 2025	Grootfontein, NA	daily rain	29.0 mm (1.1 in)	9.0 mm (0.35 in)	32 years	26 of 100 (Routine)
18 January 2025	Grootfontein, NA	daily low min	13.8 C (56.8 F)	0.5 C (0.9 F)	25 years	14 of 100 (Routine)
4 January 2025	Grootfontein, NA	daily rain	37.1 mm (1.5 in)	22.1 mm (0.9 in)	91 years	53 of 100 (Notable)
3 January 2025	Grootfontein, NA	daily low max	24.7 C (76.5 F)	1.1 C (2.0 F)	14 years	12 of 100 (Routine)
11 December 2024	Grootfontein, NA	daily high max	37.2 C (99.0 F)	0.3 C (0.5 F)	1 year	5 of 100 (Routine)
9 December 2024	Grootfontein, NA	daily high max	37.3 C (99.1 F)	1.3 C (2.3 F)	9 years	11 of 100 (Routine)
8 December 2024	Grootfontein, NA	daily high max	38.2 C (100.8 F)	0.8 C (1.4 F)	1 year	7 of 100 (Routine)
7 December 2024	Grootfontein, NA	daily high min	22.8 C (73.0 F)	0.3 C (0.5 F)	27 years	14 of 100 (Routine)
7 December 2024	Grootfontein, NA	daily high max	38.4 C (101.1 F)	2.1 C (3.8 F)	9 years	13 of 100 (Routine)
6 December 2024	Grootfontein, NA	daily high max	38.4 C (101.1 F)	2.1 C (3.8 F)	9 years	13 of 100 (Routine)
6 December 2024	Grootfontein, NA	daily high min	21.7 C (71.1 F)	0.2 C (0.4 F)	20 years	11 of 100 (Routine)

Climate Trend

18 complete years, 1982 to 2024

One stripe for each of 18 complete years at Grootfontein, 1982 to 2024. Blue stripes are years cooler than the station's own mean of 21.8 C (71.2 F); red stripes are warmer. The coolest year was 1994, at 21.0 C (69.8 F), and the warmest was 1998, at 22.7 C (72.9 F). The strongest colour marks a difference of 1.0 C (1.8 F).

Annual mean temperature at Grootfontein as warming stripes, 1982 to 2024
Year	Annual mean temperature	Difference from the station mean
1982	21.3 C	-0.41 C
1984	21.5 C	-0.21 C
1985	21.2 C	-0.59 C
1986	21.1 C	-0.61 C
1991	21.2 C	-0.53 C
1992	22.5 C	+0.75 C
1993	21.6 C	-0.11 C
1994	21.0 C	-0.74 C
1995	22.1 C	+0.32 C
1996	21.9 C	+0.10 C
1997	21.1 C	-0.64 C
1998	22.7 C	+0.96 C
1999	21.7 C	-0.06 C
2001	21.7 C	-0.02 C
2002	21.8 C	+0.01 C
2003	22.4 C	+0.65 C
2023	22.3 C	+0.57 C
2024	22.4 C	+0.64 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1917 to 2025

Yearly extremes at Grootfontein: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.2 C (115.2 F)	2016	36.8 C (98.3 F)	48
Coldest night (TNn)	-5.6 C (21.9 F)	2021	-0.1 C (31.8 F)	48
Wettest day (Rx1day)	199.9 mm (7.9 in)	1978	53.0 mm (2.1 in)	107
Wettest five days (Rx5day)	297.0 mm (11.7 in)	1978	84.0 mm (3.3 in)	107
Longest dry spell (CDD)	221 days	1975	141 days	107

Hottest day (TXx)

The hottest day of the year at Grootfontein, 1917 to 2025. The record is 46.2 C (115.2 F) in 2016, marked on the chart; the median year is 36.8 C (98.3 F).

Hottest day (TXx) at Grootfontein by year
Year	Hottest day (TXx)
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	34.0 C (93.2 F)
1975	36.0 C (96.8 F)
1976	36.0 C (96.8 F)
1977	36.0 C (96.8 F)
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	37.5 C (99.5 F)
1983	37.7 C (99.9 F)
1984	36.8 C (98.2 F)
1985	35.4 C (95.7 F)
1986	36.8 C (98.2 F)
1987	36.8 C (98.2 F)
1988	36.0 C (96.8 F)
1989	37.6 C (99.7 F)
1990	35.3 C (95.5 F)
1991	34.8 C (94.6 F)
1992	36.3 C (97.3 F)
1993	35.8 C (96.4 F)
1994	37.1 C (98.8 F)
1995	36.9 C (98.4 F)
1996	36.7 C (98.1 F)
1997	36.6 C (97.9 F)
1998	39.0 C (102.2 F)
1999	39.3 C (102.7 F)
2000	35.5 C (95.9 F)
2001	37.6 C (99.7 F)
2002	36.6 C (97.9 F)
2003	37.6 C (99.7 F)
2004	37.2 C (99.0 F)
2005	37.2 C (99.0 F)
2006	34.5 C (94.1 F)
2007	36.2 C (97.2 F)
2008	37.8 C (100.0 F)
2009	36.6 C (97.9 F)
2010	39.0 C (102.2 F)
2011	38.1 C (100.6 F)
2012	37.2 C (99.0 F)
2013	37.5 C (99.5 F)
2014	36.5 C (97.7 F)
2015	40.8 C (105.4 F)
2016	46.2 C (115.2 F)
2017	36.4 C (97.5 F)
2018	38.7 C (101.7 F)
2019	37.9 C (100.2 F)
2020	32.9 C (91.2 F)
2021	37.0 C (98.6 F)
2022	37.5 C (99.5 F)
2023	39.1 C (102.4 F)
2024	39.8 C (103.6 F)
2025	34.9 C (94.8 F)

Coldest night (TNn)

The coldest night of the year at Grootfontein, 1917 to 2025. The record is -5.6 C (21.9 F) in 2021, marked on the chart; the median year is -0.1 C (31.8 F).

Coldest night (TNn) at Grootfontein by year
Year	Coldest night (TNn)
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	1.0 C (33.8 F)
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	9.0 C (48.2 F)
1980	-2.0 C (28.4 F)
1981	1.0 C (33.8 F)
1982	-1.8 C (28.8 F)
1983	1.9 C (35.4 F)
1984	0.5 C (32.9 F)
1985	-3.2 C (26.2 F)
1986	2.6 C (36.7 F)
1987	0.4 C (32.7 F)
1988	-2.3 C (27.9 F)
1989	0.0 C (32.0 F)
1990	3.3 C (37.9 F)
1991	1.4 C (34.5 F)
1992	2.4 C (36.3 F)
1993	3.3 C (37.9 F)
1994	-2.7 C (27.1 F)
1995	-4.3 C (24.3 F)
1996	-0.5 C (31.1 F)
1997	-0.8 C (30.6 F)
1998	0.0 C (32.0 F)
1999	1.2 C (34.2 F)
2000	3.2 C (37.8 F)
2001	-0.2 C (31.6 F)
2002	-0.6 C (30.9 F)
2003	3.4 C (38.1 F)
2004	-1.0 C (30.2 F)
2005	3.8 C (38.8 F)
2006	0.0 C (32.0 F)
2007	1.5 C (34.7 F)
2008	1.6 C (34.9 F)
2009	-2.7 C (27.1 F)
2010	-5.0 C (23.0 F)
2011	-0.6 C (30.9 F)
2012	-4.9 C (23.2 F)
2013	-1.2 C (29.8 F)
2014	-4.9 C (23.2 F)
2015	-1.9 C (28.6 F)
2016	1.5 C (34.7 F)
2017	0.2 C (32.4 F)
2018	-1.4 C (29.5 F)
2019	0.2 C (32.4 F)
2020	14.9 C (58.8 F)
2021	-5.6 C (21.9 F)
2022	-2.3 C (27.9 F)
2023	-4.6 C (23.7 F)
2024	-4.2 C (24.4 F)
2025	-4.0 C (24.8 F)

Wettest day (Rx1day)

The wettest day of the year at Grootfontein, 1917 to 2025. The record is 199.9 mm (7.9 in) in 1978, marked on the chart; the median year is 53.0 mm (2.1 in).

Wettest day (Rx1day) at Grootfontein by year
Year	Wettest day (Rx1day)
1917	79.0 mm (3.1 in)
1918	90.0 mm (3.5 in)
1919	54.0 mm (2.1 in)
1920	45.0 mm (1.8 in)
1921	69.0 mm (2.7 in)
1922	25.0 mm (1.0 in)
1923	111.0 mm (4.4 in)
1924	50.0 mm (2.0 in)
1925	40.0 mm (1.6 in)
1926	54.0 mm (2.1 in)
1927	44.0 mm (1.7 in)
1928	84.0 mm (3.3 in)
1929	38.0 mm (1.5 in)
1930	53.0 mm (2.1 in)
1931	58.0 mm (2.3 in)
1932	66.0 mm (2.6 in)
1933	38.0 mm (1.5 in)
1934	63.0 mm (2.5 in)
1935	39.0 mm (1.5 in)
1936	57.0 mm (2.2 in)
1937	41.0 mm (1.6 in)
1938	74.0 mm (2.9 in)
1939	72.0 mm (2.8 in)
1940	69.0 mm (2.7 in)
1943	56.0 mm (2.2 in)
1944	74.0 mm (2.9 in)
1945	39.0 mm (1.5 in)
1946	30.0 mm (1.2 in)
1947	40.0 mm (1.6 in)
1948	26.0 mm (1.0 in)
1949	53.0 mm (2.1 in)
1950	91.0 mm (3.6 in)
1951	56.0 mm (2.2 in)
1952	26.0 mm (1.0 in)
1953	43.0 mm (1.7 in)
1954	110.0 mm (4.3 in)
1955	49.0 mm (1.9 in)
1956	61.0 mm (2.4 in)
1957	116.0 mm (4.6 in)
1958	48.0 mm (1.9 in)
1959	59.0 mm (2.3 in)
1960	57.0 mm (2.2 in)
1961	60.0 mm (2.4 in)
1962	60.0 mm (2.4 in)
1963	73.0 mm (2.9 in)
1964	31.0 mm (1.2 in)
1965	62.0 mm (2.4 in)
1966	75.0 mm (3.0 in)
1967	74.0 mm (2.9 in)
1968	50.0 mm (2.0 in)
1969	58.0 mm (2.3 in)
1970	54.0 mm (2.1 in)
1971	48.0 mm (1.9 in)
1972	64.0 mm (2.5 in)
1973	36.0 mm (1.4 in)
1974	73.0 mm (2.9 in)
1975	49.0 mm (1.9 in)
1976	67.0 mm (2.6 in)
1977	80.0 mm (3.1 in)
1978	199.9 mm (7.9 in)
1979	59.9 mm (2.4 in)
1980	70.1 mm (2.8 in)
1981	47.0 mm (1.9 in)
1982	112.5 mm (4.4 in)
1983	54.6 mm (2.1 in)
1984	24.4 mm (1.0 in)
1985	97.0 mm (3.8 in)
1986	47.5 mm (1.9 in)
1987	47.5 mm (1.9 in)
1988	43.7 mm (1.7 in)
1989	42.0 mm (1.7 in)
1990	64.0 mm (2.5 in)
1991	39.0 mm (1.5 in)
1992	35.0 mm (1.4 in)
1993	51.0 mm (2.0 in)
1994	74.0 mm (2.9 in)
1995	42.0 mm (1.7 in)
1996	80.0 mm (3.1 in)
1997	61.0 mm (2.4 in)
1998	79.0 mm (3.1 in)
1999	43.0 mm (1.7 in)
2000	76.0 mm (3.0 in)
2001	86.0 mm (3.4 in)
2002	41.0 mm (1.6 in)
2003	22.0 mm (0.9 in)
2004	27.4 mm (1.1 in)
2005	36.8 mm (1.4 in)
2006	61.0 mm (2.4 in)
2007	19.3 mm (0.8 in)
2008	46.5 mm (1.8 in)
2009	63.0 mm (2.5 in)
2010	29.7 mm (1.2 in)
2011	45.0 mm (1.8 in)
2012	34.0 mm (1.3 in)
2013	56.9 mm (2.2 in)
2014	55.9 mm (2.2 in)
2015	38.1 mm (1.5 in)
2016	31.0 mm (1.2 in)
2017	31.0 mm (1.2 in)
2018	94.0 mm (3.7 in)
2019	41.9 mm (1.6 in)
2020	40.9 mm (1.6 in)
2021	47.0 mm (1.9 in)
2022	47.0 mm (1.9 in)
2023	34.0 mm (1.3 in)
2024	48.0 mm (1.9 in)
2025	37.1 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grootfontein, 1917 to 2025. The record is 297.0 mm (11.7 in) in 1978, marked on the chart; the median year is 84.0 mm (3.3 in).

Wettest five days (Rx5day) at Grootfontein by year
Year	Wettest five days (Rx5day)
1917	84.0 mm (3.3 in)
1918	167.0 mm (6.6 in)
1919	62.0 mm (2.4 in)
1920	62.0 mm (2.4 in)
1921	202.0 mm (8.0 in)
1922	48.0 mm (1.9 in)
1923	177.0 mm (7.0 in)
1924	109.0 mm (4.3 in)
1925	104.0 mm (4.1 in)
1926	63.0 mm (2.5 in)
1927	70.0 mm (2.8 in)
1928	157.0 mm (6.2 in)
1929	91.0 mm (3.6 in)
1930	68.0 mm (2.7 in)
1931	114.0 mm (4.5 in)
1932	67.0 mm (2.6 in)
1933	54.0 mm (2.1 in)
1934	102.0 mm (4.0 in)
1935	81.0 mm (3.2 in)
1936	127.0 mm (5.0 in)
1937	75.0 mm (3.0 in)
1938	125.0 mm (4.9 in)
1939	151.0 mm (5.9 in)
1940	116.0 mm (4.6 in)
1943	61.0 mm (2.4 in)
1944	182.0 mm (7.2 in)
1945	69.0 mm (2.7 in)
1946	43.0 mm (1.7 in)
1947	113.0 mm (4.4 in)
1948	84.0 mm (3.3 in)
1949	77.0 mm (3.0 in)
1950	145.0 mm (5.7 in)
1951	67.0 mm (2.6 in)
1952	57.0 mm (2.2 in)
1953	126.0 mm (5.0 in)
1954	147.0 mm (5.8 in)
1955	67.0 mm (2.6 in)
1956	98.0 mm (3.9 in)
1957	118.0 mm (4.6 in)
1958	165.0 mm (6.5 in)
1959	105.0 mm (4.1 in)
1960	101.0 mm (4.0 in)
1961	97.0 mm (3.8 in)
1962	78.0 mm (3.1 in)
1963	125.0 mm (4.9 in)
1964	38.0 mm (1.5 in)
1965	99.0 mm (3.9 in)
1966	141.0 mm (5.6 in)
1967	125.0 mm (4.9 in)
1968	113.0 mm (4.4 in)
1969	92.0 mm (3.6 in)
1970	101.0 mm (4.0 in)
1971	81.0 mm (3.2 in)
1972	120.0 mm (4.7 in)
1973	54.0 mm (2.1 in)
1974	153.0 mm (6.0 in)
1975	74.0 mm (2.9 in)
1976	128.0 mm (5.0 in)
1977	119.1 mm (4.7 in)
1978	297.0 mm (11.7 in)
1979	75.2 mm (3.0 in)
1980	186.1 mm (7.3 in)
1981	88.1 mm (3.5 in)
1982	140.2 mm (5.5 in)
1983	142.1 mm (5.6 in)
1984	57.5 mm (2.3 in)
1985	68.3 mm (2.7 in)
1986	123.4 mm (4.9 in)
1987	66.0 mm (2.6 in)
1988	68.1 mm (2.7 in)
1989	106.0 mm (4.2 in)
1990	85.0 mm (3.3 in)
1991	62.0 mm (2.4 in)
1992	54.0 mm (2.1 in)
1993	68.0 mm (2.7 in)
1994	146.0 mm (5.7 in)
1995	73.0 mm (2.9 in)
1996	119.0 mm (4.7 in)
1997	97.0 mm (3.8 in)
1998	89.0 mm (3.5 in)
1999	73.0 mm (2.9 in)
2000	103.0 mm (4.1 in)
2001	124.0 mm (4.9 in)
2002	55.0 mm (2.2 in)
2003	42.0 mm (1.7 in)
2004	43.7 mm (1.7 in)
2005	71.7 mm (2.8 in)
2006	133.2 mm (5.2 in)
2007	17.5 mm (0.7 in)
2008	93.7 mm (3.7 in)
2009	85.7 mm (3.4 in)
2010	30.2 mm (1.2 in)
2011	44.5 mm (1.8 in)
2012	50.0 mm (2.0 in)
2013	65.0 mm (2.6 in)
2014	75.8 mm (3.0 in)
2015	61.9 mm (2.4 in)
2016	49.9 mm (2.0 in)
2017	18.1 mm (0.7 in)
2018	119.1 mm (4.7 in)
2019	30.5 mm (1.2 in)
2020	53.6 mm (2.1 in)
2021	46.0 mm (1.8 in)
2022	59.9 mm (2.4 in)
2023	78.0 mm (3.1 in)
2024	71.1 mm (2.8 in)
2025	52.4 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grootfontein, 1917 to 2025. The record is 221 days in 1975, marked on the chart; the median year is 141 days.

Longest dry spell (CDD) at Grootfontein by year
Year	Longest dry spell (CDD)
1917	121 days
1918	159 days
1919	120 days
1920	175 days
1921	142 days
1922	155 days
1923	157 days
1924	189 days
1925	132 days
1926	115 days
1927	196 days
1928	141 days
1929	203 days
1930	161 days
1931	178 days
1932	164 days
1933	193 days
1934	173 days
1935	178 days
1936	199 days
1937	181 days
1938	171 days
1939	116 days
1940	163 days
1943	154 days
1944	205 days
1945	165 days
1946	164 days
1947	147 days
1948	159 days
1949	214 days
1950	190 days
1951	150 days
1952	195 days
1953	141 days
1954	139 days
1955	185 days
1956	156 days
1957	100 days
1958	151 days
1959	142 days
1960	166 days
1961	158 days
1962	110 days
1963	192 days
1964	141 days
1965	134 days
1966	145 days
1967	101 days
1968	163 days
1969	182 days
1970	10 days
1971	19 days
1972	153 days
1973	149 days
1974	146 days
1975	221 days
1976	78 days
1977	34 days
1978	89 days
1979	41 days
1980	97 days
1981	71 days
1982	5 days
1983	17 days
1984	22 days
1985	12 days
1986	18 days
1987	7 days
1988	6 days
1989	170 days
1990	167 days
1991	189 days
1992	163 days
1993	128 days
1994	204 days
1995	106 days
1996	186 days
1997	138 days
1998	195 days
1999	187 days
2000	163 days
2001	184 days
2002	199 days
2003	95 days
2004	2 days
2005	3 days
2006	3 days
2007	2 days
2008	5 days
2009	4 days
2010	5 days
2011	2 days
2012	4 days
2013	4 days
2014	4 days
2015	4 days
2016	2 days
2017	3 days
2018	5 days
2019	3 days
2020	5 days
2021	4 days
2022	5 days
2023	5 days
2024	4 days
2025	3 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

70 years, 1917 to 2003

A day with at least 55.1 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 144.4 mm (5.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Grootfontein: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	55.1 mm (2.2 in)
5 years	76.5 mm (3.0 in)
10 years	91.7 mm (3.6 in)
25 years	111.9 mm (4.4 in)
50 years	127.8 mm (5.0 in)
100 years	144.4 mm (5.7 in)	Longer than the 70 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, 70 years of values from 1917 to 2003.

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: 199.9 mm (7.9 in) in 1978; 116.0 mm (4.6 in) in 1957; 111.0 mm (4.4 in) in 1923.

Download the Data

Data for Grootfontein standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grootfontein 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 2026-10-15 (15 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).