Glen Alphen Weather Records (SF004040070)

Record envelope, standing records and threshold days for Glen Alphen (SF004040070), South Africa, with 77 years of record.

Key Facts for Glen Alphen

Glen Alphen (SF004040070) is a weather station in South Africa at -27.12 latitude and 28.52 longitude, 1,551 m (5,089 ft) above sea level.
The station reports from 1921 to 1997, 77 years of record.
0 records set at Glen Alphen still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Glen Alphen set a daily record precipitation of 45.0 mm (1.8 in) on 29 November 1997.

About the Station

Location: South Africa, -27.12 latitude, 28.52 longitude.
Elevation: 1,551 m (5,089 ft).
Period of record: 1921 to 1997, 77 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 Glen Alphen. 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 Glen Alphen, 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 Glen Alphen still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Glen Alphen between 1 March 1967 and 1 March 1967. Each dot is a new record.

Wettest Day of Each Month

Mar: 173.0 mm (6.8 in)

The wettest day on record for each calendar month at Glen Alphen. The most was 173.0 mm (6.8 in) on 1 March 1967.

Record daily precipitation for each month at Glen Alphen
Month	Record daily precipitation (mm)	Date
Jan	76.2 mm (3.0 in)	2 January 1934
Feb	93.0 mm (3.7 in)	17 February 1967
Mar	173.0 mm (6.8 in)	1 March 1967
Apr	68.0 mm (2.7 in)	28 April 1964
May	68.5 mm (2.7 in)	4 May 1976
Jun	28.2 mm (1.1 in)	7 June 1929
Jul	51.6 mm (2.0 in)	2 July 1957
Aug	30.5 mm (1.2 in)	31 August 1957
Sep	67.5 mm (2.7 in)	26 September 1957
Oct	71.1 mm (2.8 in)	24 October 1949
Nov	99.6 mm (3.9 in)	6 November 1939
Dec	100.0 mm (3.9 in)	31 December 1977

Latest Records

Latest records at Glen Alphen
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 November 1997	Glen Alphen, ZA	daily rain	45.0 mm (1.8 in)	4.1 mm (0.16 in)	64 years	29 of 100 (Routine)
26 November 1997	Glen Alphen, ZA	daily rain (Tie)	20.0 mm (0.8 in)	tie	42 years	4 of 100 (Routine)
25 October 1997	Glen Alphen, ZA	daily rain	35.0 mm (1.4 in)	7.5 mm (0.30 in)	30 years	21 of 100 (Routine)
1 July 1997	Glen Alphen, ZA	daily rain	5.0 mm (0.20 in)	1.0 mm (0.04 in)	15 years	11 of 100 (Routine)
28 May 1997	Glen Alphen, ZA	daily rain	15.0 mm (0.6 in)	15.0 mm (0.6 in)	76 years	20 of 100 (Routine)
26 May 1997	Glen Alphen, ZA	daily rain	36.0 mm (1.4 in)	36.0 mm (1.4 in)	76 years	57 of 100 (Notable)
25 May 1997	Glen Alphen, ZA	daily rain	40.0 mm (1.6 in)	9.5 mm (0.37 in)	63 years	32 of 100 (Routine)
21 April 1997	Glen Alphen, ZA	daily rain	15.0 mm (0.6 in)	2.0 mm (0.08 in)	18 years	13 of 100 (Routine)
5 March 1997	Glen Alphen, ZA	daily rain	70.0 mm (2.8 in)	21.7 mm (0.9 in)	52 years	37 of 100 (Notable)
11 February 1997	Glen Alphen, ZA	daily rain	90.0 mm (3.5 in)	55.0 mm (2.2 in)	33 years	54 of 100 (Notable)
16 January 1997	Glen Alphen, ZA	daily rain	55.0 mm (2.2 in)	23.0 mm (0.9 in)	12 years	29 of 100 (Routine)
30 October 1996	Glen Alphen, ZA	daily rain	48.0 mm (1.9 in)	12.0 mm (0.5 in)	14 years	20 of 100 (Routine)
22 October 1996	Glen Alphen, ZA	daily rain	28.0 mm (1.1 in)	1.0 mm (0.04 in)	34 years	17 of 100 (Routine)
14 October 1996	Glen Alphen, ZA	daily rain	25.0 mm (1.0 in)	2.0 mm (0.08 in)	14 years	12 of 100 (Routine)
8 July 1996	Glen Alphen, ZA	daily rain	13.0 mm (0.5 in)	13.0 mm (0.5 in)	75 years	20 of 100 (Routine)
16 May 1996	Glen Alphen, ZA	daily rain	30.0 mm (1.2 in)	4.6 mm (0.18 in)	45 years	23 of 100 (Routine)
17 April 1996	Glen Alphen, ZA	daily rain	17.0 mm (0.7 in)	1.0 mm (0.04 in)	26 years	14 of 100 (Routine)
2 April 1996	Glen Alphen, ZA	daily rain	22.0 mm (0.9 in)	3.0 mm (0.12 in)	34 years	19 of 100 (Routine)
2 March 1996	Glen Alphen, ZA	daily rain	45.0 mm (1.8 in)	17.1 mm (0.7 in)	63 years	37 of 100 (Notable)
13 February 1996	Glen Alphen, ZA	daily rain	65.0 mm (2.6 in)	38.0 mm (1.5 in)	8 years	36 of 100 (Notable)

Extremes by Year

1921 to 1997

Yearly extremes at Glen Alphen: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	173.0 mm (6.8 in)	1967	50.4 mm (2.0 in)	76
Wettest five days (Rx5day)	173.0 mm (6.8 in)	1967	86.2 mm (3.4 in)	76
Longest dry spell (CDD)	181 days	1977	87 days	76

Wettest day (Rx1day)

The wettest day of the year at Glen Alphen, 1921 to 1997. The record is 173.0 mm (6.8 in) in 1967, marked on the chart; the median year is 50.4 mm (2.0 in).

Wettest day (Rx1day) at Glen Alphen by year
Year	Wettest day (Rx1day)
1921	57.7 mm (2.3 in)
1923	68.6 mm (2.7 in)
1924	38.1 mm (1.5 in)
1925	45.2 mm (1.8 in)
1926	31.8 mm (1.3 in)
1927	52.8 mm (2.1 in)
1928	54.6 mm (2.1 in)
1929	47.0 mm (1.9 in)
1930	29.2 mm (1.1 in)
1931	37.6 mm (1.5 in)
1932	33.0 mm (1.3 in)
1933	43.2 mm (1.7 in)
1934	76.2 mm (3.0 in)
1935	31.0 mm (1.2 in)
1936	73.7 mm (2.9 in)
1937	59.2 mm (2.3 in)
1938	46.0 mm (1.8 in)
1939	99.6 mm (3.9 in)
1940	49.5 mm (1.9 in)
1941	69.3 mm (2.7 in)
1942	35.1 mm (1.4 in)
1943	55.9 mm (2.2 in)
1944	74.9 mm (2.9 in)
1945	66.0 mm (2.6 in)
1946	63.5 mm (2.5 in)
1947	45.7 mm (1.8 in)
1948	50.3 mm (2.0 in)
1949	71.1 mm (2.8 in)
1950	67.3 mm (2.6 in)
1951	61.0 mm (2.4 in)
1952	36.8 mm (1.4 in)
1953	26.0 mm (1.0 in)
1954	44.4 mm (1.7 in)
1955	42.0 mm (1.7 in)
1956	50.5 mm (2.0 in)
1957	67.5 mm (2.7 in)
1958	57.0 mm (2.2 in)
1959	53.0 mm (2.1 in)
1960	72.0 mm (2.8 in)
1961	39.0 mm (1.5 in)
1962	43.5 mm (1.7 in)
1963	58.0 mm (2.3 in)
1964	82.5 mm (3.2 in)
1965	29.5 mm (1.2 in)
1966	33.0 mm (1.3 in)
1967	173.0 mm (6.8 in)
1968	33.0 mm (1.3 in)
1969	41.0 mm (1.6 in)
1970	58.0 mm (2.3 in)
1971	54.9 mm (2.2 in)
1972	38.0 mm (1.5 in)
1973	40.0 mm (1.6 in)
1974	68.5 mm (2.7 in)
1975	47.5 mm (1.9 in)
1976	68.5 mm (2.7 in)
1977	100.0 mm (3.9 in)
1978	40.0 mm (1.6 in)
1979	34.0 mm (1.3 in)
1980	44.0 mm (1.7 in)
1981	62.0 mm (2.4 in)
1982	36.0 mm (1.4 in)
1983	43.0 mm (1.7 in)
1984	35.0 mm (1.4 in)
1985	38.0 mm (1.5 in)
1986	56.0 mm (2.2 in)
1987	60.0 mm (2.4 in)
1988	49.0 mm (1.9 in)
1989	74.0 mm (2.9 in)
1990	36.0 mm (1.4 in)
1991	50.0 mm (2.0 in)
1992	31.0 mm (1.2 in)
1993	53.0 mm (2.1 in)
1994	63.0 mm (2.5 in)
1995	100.0 mm (3.9 in)
1996	65.0 mm (2.6 in)
1997	90.0 mm (3.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Glen Alphen, 1921 to 1997. The record is 173.0 mm (6.8 in) in 1967, marked on the chart; the median year is 86.2 mm (3.4 in).

Wettest five days (Rx5day) at Glen Alphen by year
Year	Wettest five days (Rx5day)
1921	87.9 mm (3.5 in)
1923	68.6 mm (2.7 in)
1924	98.0 mm (3.9 in)
1925	100.9 mm (4.0 in)
1926	54.9 mm (2.2 in)
1927	99.8 mm (3.9 in)
1928	59.4 mm (2.3 in)
1929	73.4 mm (2.9 in)
1930	43.9 mm (1.7 in)
1931	79.5 mm (3.1 in)
1932	42.9 mm (1.7 in)
1933	86.9 mm (3.4 in)
1934	125.8 mm (5.0 in)
1935	54.6 mm (2.1 in)
1936	119.7 mm (4.7 in)
1937	91.5 mm (3.6 in)
1938	109.5 mm (4.3 in)
1939	109.2 mm (4.3 in)
1940	79.0 mm (3.1 in)
1941	69.3 mm (2.7 in)
1942	81.8 mm (3.2 in)
1943	76.3 mm (3.0 in)
1944	130.9 mm (5.2 in)
1945	139.2 mm (5.5 in)
1946	85.4 mm (3.4 in)
1947	72.4 mm (2.9 in)
1948	101.6 mm (4.0 in)
1949	128.3 mm (5.1 in)
1950	67.3 mm (2.6 in)
1951	86.4 mm (3.4 in)
1952	71.1 mm (2.8 in)
1953	50.5 mm (2.0 in)
1954	69.5 mm (2.7 in)
1955	64.5 mm (2.5 in)
1956	103.9 mm (4.1 in)
1957	121.8 mm (4.8 in)
1958	112.4 mm (4.4 in)
1959	74.5 mm (2.9 in)
1960	84.5 mm (3.3 in)
1961	72.0 mm (2.8 in)
1962	57.5 mm (2.3 in)
1963	105.5 mm (4.2 in)
1964	103.0 mm (4.1 in)
1965	100.5 mm (4.0 in)
1966	63.5 mm (2.5 in)
1967	173.0 mm (6.8 in)
1968	68.5 mm (2.7 in)
1969	63.0 mm (2.5 in)
1970	92.0 mm (3.6 in)
1971	99.9 mm (3.9 in)
1972	78.5 mm (3.1 in)
1973	109.0 mm (4.3 in)
1974	114.5 mm (4.5 in)
1975	108.5 mm (4.3 in)
1976	103.5 mm (4.1 in)
1977	144.0 mm (5.7 in)
1978	121.0 mm (4.8 in)
1979	71.5 mm (2.8 in)
1980	76.5 mm (3.0 in)
1981	91.0 mm (3.6 in)
1982	59.0 mm (2.3 in)
1983	99.0 mm (3.9 in)
1984	54.0 mm (2.1 in)
1985	73.5 mm (2.9 in)
1986	86.0 mm (3.4 in)
1987	98.0 mm (3.9 in)
1988	90.0 mm (3.5 in)
1989	87.0 mm (3.4 in)
1990	56.0 mm (2.2 in)
1991	60.0 mm (2.4 in)
1992	53.0 mm (2.1 in)
1993	76.0 mm (3.0 in)
1994	81.0 mm (3.2 in)
1995	125.0 mm (4.9 in)
1996	141.0 mm (5.6 in)
1997	113.0 mm (4.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Glen Alphen, 1921 to 1997. The record is 181 days in 1977, marked on the chart; the median year is 87 days.

Longest dry spell (CDD) at Glen Alphen by year
Year	Longest dry spell (CDD)
1921	109 days
1923	136 days
1924	61 days
1925	23 days
1926	76 days
1927	79 days
1928	66 days
1929	41 days
1930	47 days
1931	76 days
1932	103 days
1933	63 days
1934	35 days
1935	78 days
1936	25 days
1937	159 days
1938	59 days
1939	70 days
1940	91 days
1941	157 days
1942	9 days
1943	37 days
1944	92 days
1945	78 days
1946	128 days
1947	147 days
1948	132 days
1949	83 days
1950	46 days
1951	41 days
1952	92 days
1953	153 days
1954	86 days
1955	71 days
1956	151 days
1957	78 days
1958	98 days
1959	87 days
1960	96 days
1961	107 days
1962	122 days
1963	90 days
1964	41 days
1965	80 days
1966	89 days
1967	132 days
1968	105 days
1969	129 days
1970	57 days
1971	73 days
1972	84 days
1973	114 days
1974	119 days
1975	129 days
1976	146 days
1977	181 days
1978	92 days
1979	31 days
1980	112 days
1981	77 days
1982	69 days
1983	52 days
1984	92 days
1985	73 days
1986	86 days
1987	122 days
1988	85 days
1989	60 days
1990	143 days
1991	112 days
1992	131 days
1993	143 days
1994	143 days
1995	116 days
1996	51 days
1997	31 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

66 years, 1921 to 1997

A day with at least 51.2 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 133.9 mm (5.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Glen Alphen: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	51.2 mm (2.0 in)
5 years	69.4 mm (2.7 in)
10 years	82.9 mm (3.3 in)
25 years	101.8 mm (4.0 in)
50 years	117.3 mm (4.6 in)
100 years	133.9 mm (5.3 in)	Longer than the 66 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, 66 years of values from 1921 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: 173.0 mm (6.8 in) in 1967; 100.0 mm (3.9 in) in 1977; 100.0 mm (3.9 in) in 1995.

Download the Data

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