Swansea Post Office Weather Records (ASN00092038)

Record envelope, standing records and threshold days for Swansea Post Office (ASN00092038), Australia, with 127 years of record.

Key Facts for Swansea Post Office

Swansea Post Office (ASN00092038) is a weather station in Australia at -42.12 latitude and 148.07 longitude, 6 m (20 ft) above sea level.
The station reports from 1885 to 2011, 127 years of record.
1,464 records set at Swansea Post Office still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Swansea Post Office set a daily record precipitation of 67.0 mm (2.6 in) on 24 March 2011.

About the Station

Location: Australia, -42.12 latitude, 148.07 longitude.
Elevation: 6 m (20 ft).
Period of record: 1885 to 2011, 127 years.
Eligible elements: tmax, tmin, 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 Swansea Post Office. 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 Swansea Post Office, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	40.4 C (104.7 F)	2.4 C (36.3 F)	n/a	n/a
Feb	39.2 C (102.6 F)	1.3 C (34.3 F)	n/a	n/a
Mar	36.8 C (98.2 F)	0.0 C (32.0 F)	n/a	n/a
Apr	30.1 C (86.2 F)	-1.3 C (29.7 F)	n/a	n/a
May	27.0 C (80.6 F)	-3.1 C (26.4 F)	n/a	n/a
Jun	21.1 C (70.0 F)	-4.0 C (24.8 F)	n/a	n/a
Jul	24.0 C (75.2 F)	-5.0 C (23.0 F)	n/a	n/a
Aug	24.3 C (75.7 F)	-4.2 C (24.4 F)	n/a	n/a
Sep	29.6 C (85.3 F)	-4.0 C (24.8 F)	n/a	n/a
Oct	33.9 C (93.0 F)	-1.9 C (28.6 F)	n/a	n/a
Nov	36.0 C (96.8 F)	-1.4 C (29.5 F)	n/a	n/a
Dec	38.1 C (100.6 F)	1.0 C (33.8 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Swansea Post Office still stand. 1976 holds the most, with 51.

Standing records at Swansea Post Office by the year they were set
Year set	Standing records
1957	31
1958	41
1959	30
1960	22
1961	24
1962	45
1963	32
1964	39
1965	35
1966	31
1967	20
1968	22
1969	24
1970	24
1971	14
1972	26
1973	18
1974	15
1975	28
1976	51
1977	37
1978	48
1979	48
1980	40
1981	24
1982	36
1983	33
1984	22
1985	21
1986	13
1987	27
1988	21
1989	15
1990	26
1991	20
1992	21
1993	17
1994	44
1995	27
1996	20
1997	24
1998	24
1999	22
2000	26
2001	17
2002	19
2003	22
2004	13
2005	29
2006	23
2007	23
2008	23
2009	29
2010	29
2011	9

All-Time Record Progression

4 new records

4 all-time records were set at Swansea Post Office between 7 June 1954 and 25 January 2003. Each dot is a new record.

When Swansea Post Office set new all-time records
Date	Kind	Detail
1954-06-07	Record daily precipitation	Record daily precipitation 172.5 mm (6.8 in)
1988-01-30	Record high minimum temperature	Record high minimum temperature 21.3 C (70.3 F)
1999-12-03	Record high minimum temperature	Record high minimum temperature 22.1 C (71.8 F)
2003-01-25	Record high maximum temperature	Record high maximum temperature 40.4 C (104.7 F)

Wettest Day of Each Month

Jun: 172.5 mm (6.8 in)

The wettest day on record for each calendar month at Swansea Post Office. The most was 172.5 mm (6.8 in) on 7 June 1954.

Record daily precipitation for each month at Swansea Post Office
Month	Record daily precipitation (mm)	Date
Jan	109.6 mm (4.3 in)	29 January 1995
Feb	115.6 mm (4.6 in)	19 February 1946
Mar	116.3 mm (4.6 in)	16 March 1946
Apr	121.4 mm (4.8 in)	23 April 1960
May	131.6 mm (5.2 in)	29 May 2010
Jun	172.5 mm (6.8 in)	7 June 1954
Jul	107.4 mm (4.2 in)	8 July 1891
Aug	72.4 mm (2.9 in)	1 August 1994
Sep	69.6 mm (2.7 in)	20 September 1959
Oct	75.4 mm (3.0 in)	9 October 2005
Nov	97.0 mm (3.8 in)	29 November 1889
Dec	103.4 mm (4.1 in)	19 December 1995

Period of Record Coverage

1957 to 2011

55 years of record at Swansea Post Office, 1957 to 2011. 7 years have data for under 90 percent of days and are left out of rankings: 1968, 1969, 1970, 1971, 1972, 1973, 2011.

Days with data per year at Swansea Post Office
Year	Days with data	Share of year	Complete
1957	364	100%	Yes
1958	335	92%	Yes
1959	329	90%	Yes
1960	357	98%	Yes
1961	361	99%	Yes
1962	360	99%	Yes
1963	360	99%	Yes
1964	357	98%	Yes
1965	363	99%	Yes
1966	365	100%	Yes
1967	348	95%	Yes
1968	298	81%	No
1969	309	85%	No
1970	258	71%	No
1971	245	67%	No
1972	294	80%	No
1973	314	86%	No
1974	331	91%	Yes
1975	343	94%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	364	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	363	99%	Yes
2000	362	99%	Yes
2001	362	99%	Yes
2002	359	98%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	363	99%	Yes
2011	96	26%	No

Latest Records

Latest records at Swansea Post Office
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 March 2011	Swansea Post Office, AU	daily rain	67.0 mm (2.6 in)	21.5 mm (0.8 in)	60 years	47 of 100 (Notable)
19 March 2011	Swansea Post Office, AU	daily low max	15.7 C (60.3 F)	1.0 C (1.8 F)	44 years	20 of 100 (Routine)
18 March 2011	Swansea Post Office, AU	daily low min	2.6 C (36.7 F)	1.9 C (3.4 F)	16 years	15 of 100 (Routine)
13 March 2011	Swansea Post Office, AU	daily high max	30.5 C (86.9 F)	1.8 C (3.2 F)	12 years	13 of 100 (Routine)
5 March 2011	Swansea Post Office, AU	daily low min	1.5 C (34.7 F)	2.5 C (4.5 F)	32 years	21 of 100 (Routine)
4 March 2011	Swansea Post Office, AU	daily low max	15.0 C (59.0 F)	2.2 C (4.0 F)	44 years	24 of 100 (Routine)
2 March 2011	Swansea Post Office, AU	daily low min	2.9 C (37.2 F)	0.9 C (1.6 F)	14 years	11 of 100 (Routine)
1 March 2011	Swansea Post Office, AU	daily low max	15.2 C (59.4 F)	0.3 C (0.5 F)	26 years	13 of 100 (Routine)
18 February 2011	Swansea Post Office, AU	daily low max	16.7 C (62.1 F)	1.6 C (2.9 F)	51 years	24 of 100 (Routine)
12 February 2011	Swansea Post Office, AU	daily low max	16.3 C (61.3 F)	0.1 C (0.2 F)	15 years	9 of 100 (Routine)
13 January 2011	Swansea Post Office, AU	daily rain	37.0 mm (1.5 in)	16.7 mm (0.7 in)	117 years	56 of 100 (Notable)
28 December 2010	Swansea Post Office, AU	daily low min	2.0 C (35.6 F)	4.2 C (7.6 F)	13 years	22 of 100 (Routine)
24 December 2010	Swansea Post Office, AU	daily low min	4.6 C (40.3 F)	0.6 C (1.1 F)	35 years	16 of 100 (Routine)
16 December 2010	Swansea Post Office, AU	daily low min (Tie)	4.3 C (39.7 F)	tie	29 years	3 of 100 (Routine)
8 December 2010	Swansea Post Office, AU	daily high min	16.3 C (61.3 F)	0.3 C (0.5 F)	24 years	12 of 100 (Routine)
4 December 2010	Swansea Post Office, AU	daily rain	24.6 mm (1.0 in)	5.6 mm (0.22 in)	4 years	16 of 100 (Routine)
10 November 2010	Swansea Post Office, AU	daily high max	26.2 C (79.2 F)	1.6 C (2.9 F)	25 years	16 of 100 (Routine)
31 October 2010	Swansea Post Office, AU	daily high min	15.1 C (59.2 F)	0.8 C (1.4 F)	36 years	17 of 100 (Routine)
25 October 2010	Swansea Post Office, AU	daily low min	2.3 C (36.1 F)	0.2 C (0.4 F)	33 years	15 of 100 (Routine)
24 October 2010	Swansea Post Office, AU	daily low min	2.3 C (36.1 F)	0.3 C (0.5 F)	7 years	7 of 100 (Routine)

Climate Trend

47 complete years, 1957 to 2010

One stripe for each of 47 complete years at Swansea Post Office, 1957 to 2010. Blue stripes are years cooler than the station's own mean of 12.9 C (55.1 F); red stripes are warmer. The coolest year was 1964, at 11.7 C (53.0 F), and the warmest was 2007, at 13.7 C (56.7 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Swansea Post Office as warming stripes, 1957 to 2010
Year	Annual mean temperature	Difference from the station mean
1957	12.3 C	-0.55 C
1958	12.0 C	-0.84 C
1959	12.6 C	-0.29 C
1960	12.4 C	-0.50 C
1961	13.1 C	+0.21 C
1962	12.5 C	-0.41 C
1964	11.7 C	-1.19 C
1965	12.2 C	-0.66 C
1969	12.7 C	-0.17 C
1973	13.4 C	+0.52 C
1974	13.0 C	+0.16 C
1975	12.7 C	-0.14 C
1976	11.9 C	-0.97 C
1977	12.1 C	-0.75 C
1978	12.2 C	-0.67 C
1979	12.3 C	-0.53 C
1980	12.9 C	+0.08 C
1981	13.3 C	+0.48 C
1982	13.3 C	+0.43 C
1983	12.6 C	-0.22 C
1984	13.0 C	+0.16 C
1985	12.6 C	-0.31 C
1986	12.6 C	-0.30 C
1987	12.8 C	-0.02 C
1988	13.7 C	+0.87 C
1989	13.0 C	+0.15 C
1990	13.2 C	+0.29 C
1991	13.0 C	+0.17 C
1992	12.5 C	-0.34 C
1993	13.4 C	+0.53 C
1994	13.1 C	+0.23 C
1995	12.3 C	-0.58 C
1996	12.5 C	-0.41 C
1997	13.1 C	+0.25 C
1998	13.2 C	+0.32 C
1999	13.6 C	+0.69 C
2000	13.6 C	+0.70 C
2001	13.5 C	+0.63 C
2002	13.6 C	+0.73 C
2003	13.3 C	+0.39 C
2004	12.7 C	-0.14 C
2005	13.6 C	+0.69 C
2006	12.9 C	-0.01 C
2007	13.7 C	+0.87 C
2008	12.9 C	-0.01 C
2009	13.1 C	+0.28 C
2010	12.9 C	+0.03 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1957 to 2010. In Fahrenheit: 0.3 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Swansea Post Office
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.3) per decade	0.3 F (0.2 to 0.5) per decade	1957 to 2010	47	Rise
Mean daily maximum	0.2 C (0.1 to 0.3) per decade	0.4 F (0.2 to 0.5) per decade	1957 to 2010	47	Rise
Mean daily minimum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.1 to 0.5) per decade	1957 to 2010	47	Rise

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

1885 to 2011

Yearly extremes at Swansea Post Office: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.4 C (104.7 F)	2003	35.0 C (95.0 F)	55
Coldest night (TNn)	-5.0 C (23.0 F)	1979	-1.8 C (28.8 F)	55
Wettest day (Rx1day)	172.5 mm (6.8 in)	1954	51.8 mm (2.0 in)	113
Wettest five days (Rx5day)	240.1 mm (9.5 in)	1954	77.2 mm (3.0 in)	113
Longest dry spell (CDD)	58 days	1959	24 days	113

Hottest day (TXx)

The hottest day of the year at Swansea Post Office, 1885 to 2011. The record is 40.4 C (104.7 F) in 2003, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Swansea Post Office by year
Year	Hottest day (TXx)
1885	n/a
1888	n/a
1889	n/a
1890	n/a
1891	n/a
1892	n/a
1893	n/a
1900	n/a
1904	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
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
1941	n/a
1942	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
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	35.0 C (95.0 F)
1958	32.8 C (91.0 F)
1959	38.3 C (100.9 F)
1960	36.8 C (98.2 F)
1961	33.4 C (92.1 F)
1962	35.6 C (96.1 F)
1963	32.2 C (90.0 F)
1964	34.4 C (93.9 F)
1965	35.0 C (95.0 F)
1966	35.0 C (95.0 F)
1967	31.1 C (88.0 F)
1968	38.9 C (102.0 F)
1969	34.2 C (93.6 F)
1970	29.0 C (84.2 F)
1971	33.3 C (91.9 F)
1972	34.6 C (94.3 F)
1973	35.1 C (95.2 F)
1974	33.7 C (92.7 F)
1975	36.2 C (97.2 F)
1976	36.5 C (97.7 F)
1977	31.2 C (88.2 F)
1978	36.4 C (97.5 F)
1979	33.9 C (93.0 F)
1980	34.7 C (94.5 F)
1981	35.6 C (96.1 F)
1982	39.2 C (102.6 F)
1983	39.1 C (102.4 F)
1984	34.3 C (93.7 F)
1985	36.6 C (97.9 F)
1986	34.9 C (94.8 F)
1987	34.8 C (94.6 F)
1988	37.6 C (99.7 F)
1989	36.7 C (98.1 F)
1990	35.9 C (96.6 F)
1991	39.2 C (102.6 F)
1992	32.2 C (90.0 F)
1993	35.8 C (96.4 F)
1994	38.1 C (100.6 F)
1995	37.0 C (98.6 F)
1996	32.4 C (90.3 F)
1997	38.5 C (101.3 F)
1998	36.4 C (97.5 F)
1999	34.9 C (94.8 F)
2000	35.7 C (96.3 F)
2001	37.9 C (100.2 F)
2002	32.4 C (90.3 F)
2003	40.4 C (104.7 F)
2004	33.1 C (91.6 F)
2005	33.6 C (92.5 F)
2006	37.3 C (99.1 F)
2007	35.0 C (95.0 F)
2008	36.8 C (98.2 F)
2009	39.8 C (103.6 F)
2010	33.3 C (91.9 F)
2011	31.5 C (88.7 F)

Coldest night (TNn)

The coldest night of the year at Swansea Post Office, 1885 to 2011. The record is -5.0 C (23.0 F) in 1979, marked on the chart; the median year is -1.8 C (28.8 F).

Coldest night (TNn) at Swansea Post Office by year
Year	Coldest night (TNn)
1885	n/a
1888	n/a
1889	n/a
1890	n/a
1891	n/a
1892	n/a
1893	n/a
1900	n/a
1904	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
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
1941	n/a
1942	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
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	-1.7 C (28.9 F)
1958	-2.8 C (27.0 F)
1959	-2.8 C (27.0 F)
1960	-1.9 C (28.6 F)
1961	-2.3 C (27.9 F)
1962	-2.3 C (27.9 F)
1963	-2.5 C (27.5 F)
1964	-2.8 C (27.0 F)
1965	-3.3 C (26.1 F)
1966	-3.3 C (26.1 F)
1967	-1.1 C (30.0 F)
1968	-2.7 C (27.1 F)
1969	-0.6 C (30.9 F)
1970	-0.6 C (30.9 F)
1971	-3.3 C (26.1 F)
1972	-2.9 C (26.8 F)
1973	-2.1 C (28.2 F)
1974	-0.3 C (31.5 F)
1975	-1.9 C (28.6 F)
1976	-3.9 C (25.0 F)
1977	-4.0 C (24.8 F)
1978	-4.2 C (24.4 F)
1979	-5.0 C (23.0 F)
1980	-2.4 C (27.7 F)
1981	-1.0 C (30.2 F)
1982	-1.5 C (29.3 F)
1983	-4.0 C (24.8 F)
1984	-1.5 C (29.3 F)
1985	-3.5 C (25.7 F)
1986	-1.8 C (28.8 F)
1987	-1.8 C (28.8 F)
1988	-0.3 C (31.5 F)
1989	-1.5 C (29.3 F)
1990	-1.9 C (28.6 F)
1991	-1.2 C (29.8 F)
1992	-1.7 C (28.9 F)
1993	-1.7 C (28.9 F)
1994	-3.2 C (26.2 F)
1995	-2.2 C (28.0 F)
1996	-1.2 C (29.8 F)
1997	-1.5 C (29.3 F)
1998	-0.5 C (31.1 F)
1999	-1.8 C (28.8 F)
2000	-1.2 C (29.8 F)
2001	-0.7 C (30.7 F)
2002	-2.0 C (28.4 F)
2003	-0.8 C (30.6 F)
2004	-2.2 C (28.0 F)
2005	-1.4 C (29.5 F)
2006	-1.7 C (28.9 F)
2007	-1.5 C (29.3 F)
2008	-1.5 C (29.3 F)
2009	-1.8 C (28.8 F)
2010	-2.5 C (27.5 F)
2011	1.5 C (34.7 F)

Wettest day (Rx1day)

The wettest day of the year at Swansea Post Office, 1885 to 2011. The record is 172.5 mm (6.8 in) in 1954, marked on the chart; the median year is 51.8 mm (2.0 in).

Wettest day (Rx1day) at Swansea Post Office by year
Year	Wettest day (Rx1day)
1885	47.8 mm (1.9 in)
1888	42.7 mm (1.7 in)
1889	125.0 mm (4.9 in)
1890	102.1 mm (4.0 in)
1891	107.4 mm (4.2 in)
1892	6.9 mm (0.27 in)
1893	71.4 mm (2.8 in)
1900	0.0 mm (0.00 in)
1904	37.6 mm (1.5 in)
1907	38.1 mm (1.5 in)
1908	31.8 mm (1.3 in)
1909	59.2 mm (2.3 in)
1910	39.4 mm (1.6 in)
1911	91.4 mm (3.6 in)
1912	51.8 mm (2.0 in)
1913	18.3 mm (0.7 in)
1914	38.1 mm (1.5 in)
1915	37.6 mm (1.5 in)
1916	54.6 mm (2.1 in)
1917	118.1 mm (4.6 in)
1918	41.9 mm (1.6 in)
1919	63.2 mm (2.5 in)
1920	42.4 mm (1.7 in)
1921	33.5 mm (1.3 in)
1922	107.4 mm (4.2 in)
1923	159.5 mm (6.3 in)
1924	40.9 mm (1.6 in)
1925	52.3 mm (2.1 in)
1926	41.4 mm (1.6 in)
1927	68.1 mm (2.7 in)
1928	83.8 mm (3.3 in)
1929	69.3 mm (2.7 in)
1930	36.6 mm (1.4 in)
1931	74.7 mm (2.9 in)
1932	42.4 mm (1.7 in)
1933	37.6 mm (1.5 in)
1934	69.6 mm (2.7 in)
1935	81.3 mm (3.2 in)
1936	53.1 mm (2.1 in)
1937	50.0 mm (2.0 in)
1938	100.8 mm (4.0 in)
1939	38.4 mm (1.5 in)
1940	28.7 mm (1.1 in)
1941	60.5 mm (2.4 in)
1942	36.8 mm (1.4 in)
1943	75.2 mm (3.0 in)
1944	54.9 mm (2.2 in)
1945	47.8 mm (1.9 in)
1946	116.3 mm (4.6 in)
1947	74.7 mm (2.9 in)
1948	37.8 mm (1.5 in)
1949	34.0 mm (1.3 in)
1950	45.5 mm (1.8 in)
1952	33.8 mm (1.3 in)
1953	30.7 mm (1.2 in)
1954	172.5 mm (6.8 in)
1955	34.5 mm (1.4 in)
1956	51.3 mm (2.0 in)
1957	57.2 mm (2.3 in)
1958	69.6 mm (2.7 in)
1959	69.6 mm (2.7 in)
1960	121.4 mm (4.8 in)
1961	20.3 mm (0.8 in)
1962	62.0 mm (2.4 in)
1963	29.7 mm (1.2 in)
1964	63.8 mm (2.5 in)
1965	29.2 mm (1.1 in)
1966	54.9 mm (2.2 in)
1967	36.3 mm (1.4 in)
1968	46.2 mm (1.8 in)
1969	104.9 mm (4.1 in)
1970	75.9 mm (3.0 in)
1971	35.8 mm (1.4 in)
1972	28.7 mm (1.1 in)
1973	53.3 mm (2.1 in)
1974	42.4 mm (1.7 in)
1975	52.6 mm (2.1 in)
1976	42.0 mm (1.7 in)
1977	32.2 mm (1.3 in)
1978	59.4 mm (2.3 in)
1979	22.6 mm (0.9 in)
1980	64.6 mm (2.5 in)
1981	50.1 mm (2.0 in)
1982	59.2 mm (2.3 in)
1983	65.6 mm (2.6 in)
1984	65.4 mm (2.6 in)
1985	38.6 mm (1.5 in)
1986	46.8 mm (1.8 in)
1987	56.8 mm (2.2 in)
1988	53.6 mm (2.1 in)
1989	46.2 mm (1.8 in)
1990	35.2 mm (1.4 in)
1991	27.4 mm (1.1 in)
1992	44.2 mm (1.7 in)
1993	63.2 mm (2.5 in)
1994	72.4 mm (2.9 in)
1995	109.6 mm (4.3 in)
1996	73.2 mm (2.9 in)
1997	40.0 mm (1.6 in)
1998	42.4 mm (1.7 in)
1999	55.2 mm (2.2 in)
2000	93.2 mm (3.7 in)
2001	41.2 mm (1.6 in)
2002	31.0 mm (1.2 in)
2003	68.6 mm (2.7 in)
2004	102.0 mm (4.0 in)
2005	75.4 mm (3.0 in)
2006	26.6 mm (1.0 in)
2007	27.6 mm (1.1 in)
2008	33.8 mm (1.3 in)
2009	83.4 mm (3.3 in)
2010	131.6 mm (5.2 in)
2011	67.0 mm (2.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Swansea Post Office, 1885 to 2011. The record is 240.1 mm (9.5 in) in 1954, marked on the chart; the median year is 77.2 mm (3.0 in).

Wettest five days (Rx5day) at Swansea Post Office by year
Year	Wettest five days (Rx5day)
1885	60.2 mm (2.4 in)
1888	67.3 mm (2.6 in)
1889	219.2 mm (8.6 in)
1890	130.8 mm (5.1 in)
1891	214.2 mm (8.4 in)
1892	6.9 mm (0.27 in)
1893	180.3 mm (7.1 in)
1900	0.0 mm (0.00 in)
1904	59.7 mm (2.4 in)
1907	41.4 mm (1.6 in)
1908	48.1 mm (1.9 in)
1909	63.3 mm (2.5 in)
1910	76.8 mm (3.0 in)
1911	164.4 mm (6.5 in)
1912	70.0 mm (2.8 in)
1913	33.5 mm (1.3 in)
1914	78.0 mm (3.1 in)
1915	58.5 mm (2.3 in)
1916	70.6 mm (2.8 in)
1917	129.8 mm (5.1 in)
1918	61.3 mm (2.4 in)
1919	119.7 mm (4.7 in)
1920	62.3 mm (2.5 in)
1921	37.4 mm (1.5 in)
1922	153.1 mm (6.0 in)
1923	193.6 mm (7.6 in)
1924	103.4 mm (4.1 in)
1925	115.3 mm (4.5 in)
1926	87.5 mm (3.4 in)
1927	80.0 mm (3.1 in)
1928	133.6 mm (5.3 in)
1929	106.9 mm (4.2 in)
1930	61.0 mm (2.4 in)
1931	92.7 mm (3.6 in)
1932	77.7 mm (3.1 in)
1933	56.9 mm (2.2 in)
1934	119.1 mm (4.7 in)
1935	173.7 mm (6.8 in)
1936	55.7 mm (2.2 in)
1937	83.0 mm (3.3 in)
1938	161.0 mm (6.3 in)
1939	77.5 mm (3.1 in)
1940	44.5 mm (1.8 in)
1941	122.7 mm (4.8 in)
1942	51.9 mm (2.0 in)
1943	149.4 mm (5.9 in)
1944	67.6 mm (2.7 in)
1945	69.4 mm (2.7 in)
1946	170.9 mm (6.7 in)
1947	92.0 mm (3.6 in)
1948	51.1 mm (2.0 in)
1949	43.1 mm (1.7 in)
1950	70.1 mm (2.8 in)
1952	64.3 mm (2.5 in)
1953	57.6 mm (2.3 in)
1954	240.1 mm (9.5 in)
1955	58.6 mm (2.3 in)
1956	107.7 mm (4.2 in)
1957	86.1 mm (3.4 in)
1958	103.5 mm (4.1 in)
1959	124.9 mm (4.9 in)
1960	207.5 mm (8.2 in)
1961	35.5 mm (1.4 in)
1962	74.2 mm (2.9 in)
1963	37.8 mm (1.5 in)
1964	74.5 mm (2.9 in)
1965	79.0 mm (3.1 in)
1966	91.2 mm (3.6 in)
1967	75.7 mm (3.0 in)
1968	52.8 mm (2.1 in)
1969	161.3 mm (6.4 in)
1970	118.7 mm (4.7 in)
1971	85.9 mm (3.4 in)
1972	46.3 mm (1.8 in)
1973	65.8 mm (2.6 in)
1974	128.0 mm (5.0 in)
1975	62.4 mm (2.5 in)
1976	62.8 mm (2.5 in)
1977	57.0 mm (2.2 in)
1978	106.6 mm (4.2 in)
1979	33.8 mm (1.3 in)
1980	77.2 mm (3.0 in)
1981	124.9 mm (4.9 in)
1982	113.0 mm (4.4 in)
1983	76.8 mm (3.0 in)
1984	81.7 mm (3.2 in)
1985	119.6 mm (4.7 in)
1986	89.6 mm (3.5 in)
1987	66.6 mm (2.6 in)
1988	61.6 mm (2.4 in)
1989	48.0 mm (1.9 in)
1990	62.6 mm (2.5 in)
1991	60.2 mm (2.4 in)
1992	50.8 mm (2.0 in)
1993	180.2 mm (7.1 in)
1994	133.8 mm (5.3 in)
1995	141.8 mm (5.6 in)
1996	76.0 mm (3.0 in)
1997	46.0 mm (1.8 in)
1998	95.8 mm (3.8 in)
1999	66.8 mm (2.6 in)
2000	110.4 mm (4.3 in)
2001	59.6 mm (2.3 in)
2002	33.0 mm (1.3 in)
2003	94.6 mm (3.7 in)
2004	162.2 mm (6.4 in)
2005	103.2 mm (4.1 in)
2006	37.8 mm (1.5 in)
2007	39.8 mm (1.6 in)
2008	53.2 mm (2.1 in)
2009	109.8 mm (4.3 in)
2010	146.2 mm (5.8 in)
2011	144.8 mm (5.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Swansea Post Office, 1885 to 2011. The record is 58 days in 1959, marked on the chart; the median year is 24 days.

Longest dry spell (CDD) at Swansea Post Office by year
Year	Longest dry spell (CDD)
1885	15 days
1888	29 days
1889	12 days
1890	20 days
1891	17 days
1892	24 days
1893	30 days
1900	28 days
1904	37 days
1907	20 days
1908	38 days
1909	19 days
1910	44 days
1911	32 days
1912	22 days
1913	20 days
1914	38 days
1915	20 days
1916	32 days
1917	18 days
1918	17 days
1919	23 days
1920	32 days
1921	19 days
1922	31 days
1923	23 days
1924	15 days
1925	14 days
1926	28 days
1927	25 days
1928	19 days
1929	17 days
1930	28 days
1931	24 days
1932	43 days
1933	29 days
1934	20 days
1935	26 days
1936	16 days
1937	29 days
1938	21 days
1939	34 days
1940	19 days
1941	29 days
1942	24 days
1943	30 days
1944	30 days
1945	24 days
1946	24 days
1947	29 days
1948	19 days
1949	19 days
1950	23 days
1952	18 days
1953	24 days
1954	25 days
1955	29 days
1956	14 days
1957	27 days
1958	19 days
1959	58 days
1960	16 days
1961	22 days
1962	19 days
1963	16 days
1964	14 days
1965	27 days
1966	30 days
1967	43 days
1968	18 days
1969	21 days
1970	19 days
1971	26 days
1972	31 days
1973	18 days
1974	12 days
1975	25 days
1976	33 days
1977	31 days
1978	20 days
1979	22 days
1980	42 days
1981	32 days
1982	31 days
1983	27 days
1984	24 days
1985	19 days
1986	27 days
1987	30 days
1988	25 days
1989	13 days
1990	23 days
1991	27 days
1992	21 days
1993	24 days
1994	24 days
1995	30 days
1996	28 days
1997	29 days
1998	37 days
1999	25 days
2000	28 days
2001	17 days
2002	22 days
2003	22 days
2004	19 days
2005	25 days
2006	34 days
2007	21 days
2008	30 days
2009	15 days
2010	22 days
2011	13 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.

Frost Dates and Growing Season

45 years with a frost

Across 45 years with a frost, the median last spring frost at Swansea Post Office falls on 10 September and the median first autumn frost on 23 May, which leaves a median of 275 days between them.

Fitted over all years, the growing season changes by +12.0 days per decade at this station.

Frost dates and growing season at Swansea Post Office
Measure	Median, all years	Earliest period	Recent period (1979 to 2009)	Recent against earliest	Fitted trend
Last spring frost	10 September	n/a	30 August	n/a	-8.2 days per decade
First autumn frost	23 May	n/a	3 June	n/a	+3.8 days per decade
Growing days	275 days	n/a	284 days	n/a	+12.0 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

101 years, 1904 to 2010

A day with at least 50.7 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 154.7 mm (6.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Swansea Post Office: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	50.7 mm (2.0 in)
5 years	73.3 mm (2.9 in)
10 years	90.2 mm (3.6 in)
25 years	114.0 mm (4.5 in)
50 years	133.5 mm (5.3 in)
100 years	154.7 mm (6.1 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 101 years of values from 1904 to 2010.

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: 159.5 mm (6.3 in) in 1923; 131.6 mm (5.2 in) in 2010; 121.4 mm (4.8 in) in 1960.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Swansea Post Office, at 1981. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.3 C (0.5 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Swansea Post Office, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1981	+0.3	+0.5	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Swansea Post Office standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Swansea Post Office 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).