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Data as of 2025-12-31
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Built 2026-10-16 (16 October 2026)

Groot Rietvlei Weather Records (SF004076390)

Record envelope, standing records and threshold days for Groot Rietvlei (SF004076390), South Africa, with 69 years of record.

Key Facts for Groot Rietvlei

  • Groot Rietvlei (SF004076390) is a weather station in South Africa at -27.13 latitude and 30.37 longitude, 1,311 m (4,301 ft) above sea level.
  • The station reports from 1929 to 1997, 69 years of record.
  • 0 records set at Groot Rietvlei still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Groot Rietvlei set a daily record precipitation of 16.0 mm (0.6 in) on 30 June 1997.

About the Station

  • Location: South Africa, -27.13 latitude, 30.37 longitude.
  • Elevation: 1,311 m (4,301 ft).
  • Period of record: 1929 to 1997, 69 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Groot Rietvlei, with 2026 drawn through them The band shows the record high and record low for each calendar day at Groot Rietvlei. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Groot Rietvlei. 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 Groot Rietvlei, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jann/an/an/an/a
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Which Years Hold Standing Records

0 standing records
Standing records at Groot Rietvlei by the year they were set 0 records at Groot Rietvlei still stand. 00000000000
0 records at Groot Rietvlei still stand.
Standing records at Groot Rietvlei by the year they were set
Year setStanding records

Wettest Day of Each Month

Feb: 180.6 mm (7.1 in)
Record daily precipitation for each month at Groot Rietvlei The wettest day on record for each calendar month at Groot Rietvlei. The most was 180.6 mm (7.1 in) on 5 February 1939. 050100150200 Jan: 94.0 mm (3.7 in), 15 January 1972 Jan Feb: 180.6 mm (7.1 in), 5 February 1939 Feb Mar: 76.0 mm (3.0 in), 25 March 1995 Mar Apr: 70.0 mm (2.8 in), 9 April 1953 Apr May: 137.2 mm (5.4 in), 5 May 1940 May Jun: 28.0 mm (1.1 in), 13 June 1963 Jun Jul: 70.0 mm (2.8 in), 4 July 1963 Jul Aug: 41.4 mm (1.6 in), 19 August 1951 Aug Sep: 57.0 mm (2.2 in), 13 September 1995 Sep Oct: 87.4 mm (3.4 in), 22 October 1938 Oct Nov: 100.1 mm (3.9 in), 25 November 1950 Nov Dec: 101.0 mm (4.0 in), 28 December 1964 Dec
The wettest day on record for each calendar month at Groot Rietvlei. The most was 180.6 mm (7.1 in) on 5 February 1939.
Record daily precipitation for each month at Groot Rietvlei
MonthRecord daily precipitation (mm)Date
Jan94.0 mm (3.7 in)15 January 1972
Feb180.6 mm (7.1 in)5 February 1939
Mar76.0 mm (3.0 in)25 March 1995
Apr70.0 mm (2.8 in)9 April 1953
May137.2 mm (5.4 in)5 May 1940
Jun28.0 mm (1.1 in)13 June 1963
Jul70.0 mm (2.8 in)4 July 1963
Aug41.4 mm (1.6 in)19 August 1951
Sep57.0 mm (2.2 in)13 September 1995
Oct87.4 mm (3.4 in)22 October 1938
Nov100.1 mm (3.9 in)25 November 1950
Dec101.0 mm (4.0 in)28 December 1964

Latest Records

20
Latest records at Groot Rietvlei
DateStationRecordValueBeat old record byOld record stoodSignificance
30 June 1997Groot Rietvlei, ZAdaily rain16.0 mm (0.6 in)13.0 mm (0.5 in)34 years20 of 100 (Routine)
11 June 1997Groot Rietvlei, ZAdaily rain16.0 mm (0.6 in)16.0 mm (0.6 in)67 years20 of 100 (Routine)
10 June 1997Groot Rietvlei, ZAdaily rain14.0 mm (0.6 in)7.9 mm (0.31 in)50 years20 of 100 (Routine)
25 May 1997Groot Rietvlei, ZAdaily rain9.0 mm (0.35 in)0.1 mm (0.00 in)63 years20 of 100 (Routine)
24 May 1997Groot Rietvlei, ZAdaily rain16.0 mm (0.6 in)5.1 mm (0.20 in)48 years20 of 100 (Routine)
1 April 1997Groot Rietvlei, ZAdaily rain21.0 mm (0.8 in)1.0 mm (0.04 in)0 years6 of 100 (Routine)
7 March 1997Groot Rietvlei, ZAdaily rain41.0 mm (1.6 in)7.2 mm (0.28 in)42 years23 of 100 (Routine)
4 March 1997Groot Rietvlei, ZAdaily rain75.0 mm (3.0 in)30.5 mm (1.2 in)36 years39 of 100 (Notable)
26 February 1997Groot Rietvlei, ZAdaily rain32.0 mm (1.3 in)3.3 mm (0.13 in)47 years21 of 100 (Routine)
17 May 1996Groot Rietvlei, ZAdaily rain14.5 mm (0.6 in)2.0 mm (0.08 in)35 years17 of 100 (Routine)
16 May 1996Groot Rietvlei, ZAdaily rain (Tie)10.0 mm (0.4 in)tie24 years3 of 100 (Routine)
15 May 1996Groot Rietvlei, ZAdaily rain17.0 mm (0.7 in)5.6 mm (0.22 in)48 years20 of 100 (Routine)
14 April 1996Groot Rietvlei, ZAdaily rain25.0 mm (1.0 in)6.5 mm (0.26 in)42 years22 of 100 (Routine)
1 April 1996Groot Rietvlei, ZAdaily rain20.0 mm (0.8 in)2.0 mm (0.08 in)35 years17 of 100 (Routine)
11 February 1996Groot Rietvlei, ZAdaily rain78.0 mm (3.1 in)8.4 mm (0.33 in)56 years28 of 100 (Routine)
3 February 1996Groot Rietvlei, ZAdaily rain56.0 mm (2.2 in)1.5 mm (0.06 in)30 years15 of 100 (Routine)
26 December 1995Groot Rietvlei, ZAdaily rain35.0 mm (1.4 in)4.0 mm (0.16 in)6 years10 of 100 (Routine)
6 October 1995Groot Rietvlei, ZAdaily rain11.0 mm (0.4 in)4.1 mm (0.16 in)57 years20 of 100 (Routine)
13 September 1995Groot Rietvlei, ZAmonthly rain57.0 mm (2.2 in)15.0 mm (0.6 in)7 years33 of 100 (Routine)
19 April 1995Groot Rietvlei, ZAdaily rain8.0 mm (0.31 in)2.0 mm (0.08 in)8 years9 of 100 (Routine)

Extremes by Year

1929 to 1997
Yearly extremes at Groot Rietvlei: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)180.6 mm (7.1 in)193959.2 mm (2.3 in)69
Wettest five days (Rx5day)230.6 mm (9.1 in)1939100.5 mm (4.0 in)69
Longest dry spell (CDD)169 days197792 days69

Wettest day (Rx1day)

Wettest day (Rx1day) at Groot Rietvlei by year The wettest day of the year at Groot Rietvlei, 1929 to 1997. The record is 180.6 mm (7.1 in) in 1939, marked on the chart; the median year is 59.2 mm (2.3 in). 050100150200194019601980Record: 180.6 mm (7.1 in) in 1939
The wettest day of the year at Groot Rietvlei, 1929 to 1997. The record is 180.6 mm (7.1 in) in 1939, marked on the chart; the median year is 59.2 mm (2.3 in).
Wettest day (Rx1day) at Groot Rietvlei by year
YearWettest day (Rx1day)
192956.9 mm (2.2 in)
193057.4 mm (2.3 in)
193137.8 mm (1.5 in)
193252.3 mm (2.1 in)
193390.9 mm (3.6 in)
193499.1 mm (3.9 in)
193559.2 mm (2.3 in)
193664.3 mm (2.5 in)
193772.4 mm (2.9 in)
193887.4 mm (3.4 in)
1939180.6 mm (7.1 in)
1940137.2 mm (5.4 in)
194165.3 mm (2.6 in)
194257.2 mm (2.3 in)
194352.1 mm (2.1 in)
194445.7 mm (1.8 in)
194550.8 mm (2.0 in)
194643.2 mm (1.7 in)
194753.8 mm (2.1 in)
194876.7 mm (3.0 in)
194953.1 mm (2.1 in)
1950100.1 mm (3.9 in)
195177.2 mm (3.0 in)
195295.3 mm (3.8 in)
195370.0 mm (2.8 in)
195435.5 mm (1.4 in)
195553.0 mm (2.1 in)
195697.0 mm (3.8 in)
195754.0 mm (2.1 in)
195854.0 mm (2.1 in)
195951.0 mm (2.0 in)
196062.0 mm (2.4 in)
196154.0 mm (2.1 in)
196255.0 mm (2.2 in)
196370.0 mm (2.8 in)
1964101.0 mm (4.0 in)
196554.5 mm (2.1 in)
196663.5 mm (2.5 in)
196774.0 mm (2.9 in)
196858.5 mm (2.3 in)
196936.0 mm (1.4 in)
197043.0 mm (1.7 in)
197169.0 mm (2.7 in)
197294.0 mm (3.7 in)
197354.5 mm (2.1 in)
197480.0 mm (3.1 in)
197578.0 mm (3.1 in)
197665.0 mm (2.6 in)
197763.0 mm (2.5 in)
197854.0 mm (2.1 in)
197970.5 mm (2.8 in)
198048.5 mm (1.9 in)
198175.0 mm (3.0 in)
198246.0 mm (1.8 in)
198364.0 mm (2.5 in)
198475.5 mm (3.0 in)
198553.5 mm (2.1 in)
198645.0 mm (1.8 in)
198750.0 mm (2.0 in)
198837.0 mm (1.5 in)
198950.0 mm (2.0 in)
199073.0 mm (2.9 in)
199152.0 mm (2.0 in)
199244.0 mm (1.7 in)
199368.0 mm (2.7 in)
199448.0 mm (1.9 in)
199576.0 mm (3.0 in)
199678.0 mm (3.1 in)
199775.0 mm (3.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Groot Rietvlei by year The wettest five days of the year at Groot Rietvlei, 1929 to 1997. The record is 230.6 mm (9.1 in) in 1939, marked on the chart; the median year is 100.5 mm (4.0 in). 50100150200250194019601980Record: 230.6 mm (9.1 in) in 1939
The wettest five days of the year at Groot Rietvlei, 1929 to 1997. The record is 230.6 mm (9.1 in) in 1939, marked on the chart; the median year is 100.5 mm (4.0 in).
Wettest five days (Rx5day) at Groot Rietvlei by year
YearWettest five days (Rx5day)
192979.5 mm (3.1 in)
193082.8 mm (3.3 in)
193183.8 mm (3.3 in)
193288.9 mm (3.5 in)
1933116.8 mm (4.6 in)
1934138.7 mm (5.5 in)
193593.0 mm (3.7 in)
1936162.6 mm (6.4 in)
1937119.4 mm (4.7 in)
1938132.6 mm (5.2 in)
1939230.6 mm (9.1 in)
1940137.2 mm (5.4 in)
194178.0 mm (3.1 in)
194285.3 mm (3.4 in)
1943120.8 mm (4.8 in)
1944142.7 mm (5.6 in)
194595.3 mm (3.8 in)
194677.0 mm (3.0 in)
1947102.3 mm (4.0 in)
194898.6 mm (3.9 in)
1949112.0 mm (4.4 in)
1950117.9 mm (4.6 in)
1951140.2 mm (5.5 in)
195299.9 mm (3.9 in)
1953104.0 mm (4.1 in)
195494.0 mm (3.7 in)
1955120.4 mm (4.7 in)
1956140.7 mm (5.5 in)
195784.8 mm (3.3 in)
195861.0 mm (2.4 in)
195999.5 mm (3.9 in)
196099.5 mm (3.9 in)
196182.0 mm (3.2 in)
1962135.0 mm (5.3 in)
1963101.5 mm (4.0 in)
1964110.5 mm (4.4 in)
1965111.9 mm (4.4 in)
1966100.5 mm (4.0 in)
1967137.1 mm (5.4 in)
196872.0 mm (2.8 in)
1969106.5 mm (4.2 in)
197068.5 mm (2.7 in)
1971122.0 mm (4.8 in)
1972112.5 mm (4.4 in)
1973112.0 mm (4.4 in)
197497.5 mm (3.8 in)
1975138.5 mm (5.5 in)
197680.0 mm (3.1 in)
197797.5 mm (3.8 in)
197865.5 mm (2.6 in)
197992.5 mm (3.6 in)
1980102.8 mm (4.0 in)
198180.5 mm (3.2 in)
198275.0 mm (3.0 in)
198369.0 mm (2.7 in)
1984225.0 mm (8.9 in)
1985104.5 mm (4.1 in)
198672.5 mm (2.9 in)
198795.5 mm (3.8 in)
1988113.5 mm (4.5 in)
1989122.0 mm (4.8 in)
199087.5 mm (3.4 in)
199180.0 mm (3.1 in)
199276.0 mm (3.0 in)
199398.5 mm (3.9 in)
199464.0 mm (2.5 in)
1995147.0 mm (5.8 in)
1996106.0 mm (4.2 in)
1997165.0 mm (6.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Groot Rietvlei by year The longest dry spell of the year at Groot Rietvlei, 1929 to 1997. The record is 169 days in 1977, marked on the chart; the median year is 92 days. 050100150200194019601980Record: 169 days in 1977
The longest dry spell of the year at Groot Rietvlei, 1929 to 1997. The record is 169 days in 1977, marked on the chart; the median year is 92 days.
Longest dry spell (CDD) at Groot Rietvlei by year
YearLongest dry spell (CDD)
192963 days
193084 days
193168 days
193291 days
193363 days
193433 days
1935111 days
1936110 days
1937154 days
193833 days
193954 days
194055 days
1941161 days
194277 days
194353 days
194492 days
1945109 days
1946104 days
194745 days
1948126 days
1949106 days
1950107 days
195195 days
195292 days
1953106 days
1954114 days
1955127 days
195658 days
195746 days
1958142 days
1959119 days
196080 days
196197 days
196268 days
196378 days
196447 days
196540 days
196682 days
196788 days
196868 days
1969102 days
197040 days
197184 days
1972101 days
1973114 days
197479 days
1975108 days
1976145 days
1977169 days
1978114 days
197931 days
198099 days
1981103 days
1982125 days
198359 days
198441 days
1985110 days
1986157 days
198797 days
198850 days
198955 days
1990100 days
199156 days
1992130 days
1993102 days
1994153 days
1995133 days
199678 days
199733 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, 1930 to 1996

A day with at least 60.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 151.8 mm (6.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Groot Rietvlei: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years60.3 mm (2.4 in)
5 years79.1 mm (3.1 in)
10 years93.5 mm (3.7 in)
25 years114.4 mm (4.5 in)
50 years132.1 mm (5.2 in)
100 years151.8 mm (6.0 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 1930 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: 180.6 mm (7.1 in) in 1939; 137.2 mm (5.4 in) in 1940; 101.0 mm (4.0 in) in 1964.

Download the Data

  • Data for Groot Rietvlei standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Groot Rietvlei 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 . Last revised (2025-12-31).