Swan Island Lighthouse Weather Records (ASN00092037)

Record envelope, standing records and threshold days for Swan Island Lighthouse (ASN00092037), Australia, with 127 years of record.

Key Facts for Swan Island Lighthouse

Swan Island Lighthouse (ASN00092037) is a weather station in Australia at -40.73 latitude and 148.13 longitude, 11 m (36 ft) above sea level.
The station reports from 1878 to 2004, 127 years of record.
1,464 records set at Swan Island Lighthouse still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Swan Island Lighthouse set a daily record precipitation of 21.4 mm (0.8 in) on 8 October 2004.

About the Station

Location: Australia, -40.73 latitude, 148.13 longitude.
Elevation: 11 m (36 ft).
Period of record: 1878 to 2004, 127 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 Swan Island Lighthouse. 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 Swan Island Lighthouse, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	29.0 C (84.2 F)	7.8 C (46.0 F)	n/a	n/a
Feb	27.0 C (80.6 F)	8.8 C (47.8 F)	n/a	n/a
Mar	27.1 C (80.8 F)	6.2 C (43.2 F)	n/a	n/a
Apr	23.2 C (73.8 F)	6.2 C (43.2 F)	n/a	n/a
May	21.6 C (70.9 F)	4.5 C (40.1 F)	n/a	n/a
Jun	17.9 C (64.2 F)	1.5 C (34.7 F)	n/a	n/a
Jul	16.8 C (62.2 F)	1.0 C (33.8 F)	n/a	n/a
Aug	17.1 C (62.8 F)	2.3 C (36.1 F)	n/a	n/a
Sep	22.8 C (73.0 F)	3.2 C (37.8 F)	n/a	n/a
Oct	23.6 C (74.5 F)	2.8 C (37.0 F)	n/a	n/a
Nov	25.9 C (78.6 F)	5.4 C (41.7 F)	n/a	n/a
Dec	28.0 C (82.4 F)	5.9 C (42.6 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Swan Island Lighthouse still stand. 1988 holds the most, with 89.

Standing records at Swan Island Lighthouse by the year they were set
Year set	Standing records
1983	12
1984	75
1985	56
1986	63
1987	86
1988	89
1989	77
1990	70
1991	58
1992	85
1993	49
1994	82
1995	74
1996	75
1997	47
1998	78
1999	87
2000	71
2001	84
2002	61
2003	78
2004	7

All-Time Record Progression

4 new records

4 all-time records were set at Swan Island Lighthouse between 1 June 1939 and 23 August 1971. Each dot is a new record.

When Swan Island Lighthouse set new all-time records
Date	Kind	Detail
1939-06-01	Record daily precipitation	Record daily precipitation 80.3 mm (3.2 in)
1946-02-19	Record daily precipitation	Record daily precipitation 92.7 mm (3.6 in)
1948-10-12	Record daily precipitation	Record daily precipitation 96.8 mm (3.8 in)
1971-08-23	Record daily precipitation	Record daily precipitation 98.0 mm (3.9 in)

Wettest Day of Each Month

Aug: 98.0 mm (3.9 in)

The wettest day on record for each calendar month at Swan Island Lighthouse. The most was 98.0 mm (3.9 in) on 23 August 1971.

Record daily precipitation for each month at Swan Island Lighthouse
Month	Record daily precipitation (mm)	Date
Jan	55.6 mm (2.2 in)	26 January 1998
Feb	92.7 mm (3.6 in)	19 February 1946
Mar	79.2 mm (3.1 in)	28 March 1914
Apr	73.2 mm (2.9 in)	12 April 1974
May	96.8 mm (3.8 in)	13 May 1960
Jun	80.3 mm (3.2 in)	1 June 1939
Jul	60.4 mm (2.4 in)	5 July 1982
Aug	98.0 mm (3.9 in)	23 August 1971
Sep	45.7 mm (1.8 in)	28 September 1910
Oct	96.8 mm (3.8 in)	12 October 1948
Nov	49.8 mm (2.0 in)	9 November 1952
Dec	76.0 mm (3.0 in)	28 December 1999

Period of Record Coverage

1983 to 2004

22 years of record at Swan Island Lighthouse, 1983 to 2004. 2 years have data for under 90 percent of days and are left out of rankings: 1983, 2004.

Days with data per year at Swan Island Lighthouse
Year	Days with data	Share of year	Complete
1983	80	22%	No
1984	366	100%	Yes
1985	364	100%	Yes
1986	358	98%	Yes
1987	360	99%	Yes
1988	366	100%	Yes
1989	362	99%	Yes
1990	356	98%	Yes
1991	362	99%	Yes
1992	365	100%	Yes
1993	364	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	364	100%	Yes
1999	365	100%	Yes
2000	363	99%	Yes
2001	357	98%	Yes
2002	357	98%	Yes
2003	360	99%	Yes
2004	139	38%	No

Latest Records

Latest records at Swan Island Lighthouse
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 October 2004	Swan Island Lighthouse, AU	daily rain	21.4 mm (0.8 in)	0.6 mm (0.02 in)	3 years	10 of 100 (Routine)
27 September 2004	Swan Island Lighthouse, AU	daily rain	23.0 mm (0.9 in)	6.7 mm (0.26 in)	42 years	20 of 100 (Routine)
14 August 2004	Swan Island Lighthouse, AU	daily rain	23.0 mm (0.9 in)	5.2 mm (0.20 in)	42 years	20 of 100 (Routine)
30 April 2004	Swan Island Lighthouse, AU	daily rain	17.0 mm (0.7 in)	2.8 mm (0.11 in)	36 years	20 of 100 (Routine)
6 October 2003	Swan Island Lighthouse, AU	daily rain	37.8 mm (1.5 in)	16.2 mm (0.6 in)	0 years	36 of 100 (Notable)
25 September 2003	Swan Island Lighthouse, AU	daily rain	27.0 mm (1.1 in)	15.6 mm (0.6 in)	42 years	54 of 100 (Notable)
14 September 2003	Swan Island Lighthouse, AU	daily rain	16.2 mm (0.6 in)	1.5 mm (0.06 in)	56 years	20 of 100 (Routine)
28 April 2003	Swan Island Lighthouse, AU	daily rain	51.6 mm (2.0 in)	27.5 mm (1.1 in)	32 years	54 of 100 (Notable)
20 March 2003	Swan Island Lighthouse, AU	daily rain	31.0 mm (1.2 in)	5.9 mm (0.23 in)	32 years	26 of 100 (Routine)
9 March 2003	Swan Island Lighthouse, AU	daily rain	39.0 mm (1.5 in)	11.8 mm (0.5 in)	92 years	51 of 100 (Notable)
6 October 2002	Swan Island Lighthouse, AU	daily rain	21.6 mm (0.9 in)	2.3 mm (0.09 in)	63 years	20 of 100 (Routine)
18 November 2001	Swan Island Lighthouse, AU	daily rain	21.6 mm (0.9 in)	3.8 mm (0.15 in)	12 years	19 of 100 (Routine)
8 October 2001	Swan Island Lighthouse, AU	daily rain	20.8 mm (0.8 in)	4.5 mm (0.18 in)	46 years	20 of 100 (Routine)
18 August 2001	Swan Island Lighthouse, AU	daily rain	21.6 mm (0.9 in)	4.3 mm (0.17 in)	62 years	20 of 100 (Routine)
9 August 2000	Swan Island Lighthouse, AU	daily rain	18.8 mm (0.7 in)	1.0 mm (0.04 in)	45 years	20 of 100 (Routine)
26 July 2000	Swan Island Lighthouse, AU	daily rain	18.8 mm (0.7 in)	5.6 mm (0.22 in)	27 years	20 of 100 (Routine)
3 April 2000	Swan Island Lighthouse, AU	daily rain	21.4 mm (0.8 in)	8.7 mm (0.34 in)	58 years	20 of 100 (Routine)
5 January 2000	Swan Island Lighthouse, AU	daily rain	43.4 mm (1.7 in)	12.7 mm (0.5 in)	64 years	45 of 100 (Notable)
4 January 2000	Swan Island Lighthouse, AU	daily rain	48.4 mm (1.9 in)	11.0 mm (0.4 in)	12 years	27 of 100 (Routine)
28 December 1999	Swan Island Lighthouse, AU	monthly rain	76.0 mm (3.0 in)	6.2 mm (0.24 in)	6 years	29 of 100 (Routine)

Climate Trend

18 complete years, 1984 to 2003

One stripe for each of 18 complete years at Swan Island Lighthouse, 1984 to 2003. Blue stripes are years cooler than the station's own mean of 13.9 C (57.0 F); red stripes are warmer. The coolest year was 1996, at 13.3 C (55.9 F), and the warmest was 1988, at 14.7 C (58.4 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Swan Island Lighthouse as warming stripes, 1984 to 2003
Year	Annual mean temperature	Difference from the station mean
1984	13.5 C	-0.39 C
1985	13.8 C	-0.12 C
1986	13.5 C	-0.40 C
1988	14.7 C	+0.77 C
1989	14.3 C	+0.40 C
1991	13.8 C	-0.13 C
1992	13.5 C	-0.40 C
1993	14.2 C	+0.29 C
1994	13.6 C	-0.31 C
1995	13.3 C	-0.57 C
1996	13.3 C	-0.60 C
1997	13.7 C	-0.16 C
1998	13.6 C	-0.32 C
1999	14.5 C	+0.61 C
2000	14.2 C	+0.29 C
2001	14.5 C	+0.59 C
2002	14.1 C	+0.24 C
2003	14.2 C	+0.26 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

1878 to 2004

Yearly extremes at Swan Island Lighthouse: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	29.0 C (84.2 F)	1990	25.9 C (78.6 F)	22
Coldest night (TNn)	1.0 C (33.8 F)	1986	3.7 C (38.6 F)	22
Wettest day (Rx1day)	98.0 mm (3.9 in)	1971	37.6 mm (1.5 in)	101
Wettest five days (Rx5day)	169.6 mm (6.7 in)	1971	59.7 mm (2.4 in)	101
Longest dry spell (CDD)	44 days	1992	22 days	101

Hottest day (TXx)

The hottest day of the year at Swan Island Lighthouse, 1878 to 2004. The record is 29.0 C (84.2 F) in 1990, marked on the chart; the median year is 25.9 C (78.6 F).

Hottest day (TXx) at Swan Island Lighthouse by year
Year	Hottest day (TXx)
1878	n/a
1895	n/a
1900	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
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	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	25.7 C (78.3 F)
1984	25.9 C (78.6 F)
1985	24.8 C (76.6 F)
1986	27.0 C (80.6 F)
1987	25.2 C (77.4 F)
1988	26.7 C (80.1 F)
1989	26.2 C (79.2 F)
1990	29.0 C (84.2 F)
1991	27.1 C (80.8 F)
1992	25.5 C (77.9 F)
1993	24.8 C (76.6 F)
1994	27.2 C (81.0 F)
1995	25.7 C (78.3 F)
1996	24.0 C (75.2 F)
1997	29.0 C (84.2 F)
1998	28.0 C (82.4 F)
1999	25.8 C (78.4 F)
2000	25.9 C (78.6 F)
2001	27.0 C (80.6 F)
2002	25.8 C (78.4 F)
2003	28.7 C (83.7 F)
2004	24.9 C (76.8 F)

Coldest night (TNn)

The coldest night of the year at Swan Island Lighthouse, 1878 to 2004. The record is 1.0 C (33.8 F) in 1986, marked on the chart; the median year is 3.7 C (38.6 F).

Coldest night (TNn) at Swan Island Lighthouse by year
Year	Coldest night (TNn)
1878	n/a
1895	n/a
1900	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
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	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	5.5 C (41.9 F)
1984	2.5 C (36.5 F)
1985	4.4 C (39.9 F)
1986	1.0 C (33.8 F)
1987	4.6 C (40.3 F)
1988	4.7 C (40.5 F)
1989	3.4 C (38.1 F)
1990	3.9 C (39.0 F)
1991	3.4 C (38.1 F)
1992	1.5 C (34.7 F)
1993	2.3 C (36.1 F)
1994	3.2 C (37.8 F)
1995	3.7 C (38.7 F)
1996	3.5 C (38.3 F)
1997	3.0 C (37.4 F)
1998	3.6 C (38.5 F)
1999	4.7 C (40.5 F)
2000	4.3 C (39.7 F)
2001	3.8 C (38.8 F)
2002	3.9 C (39.0 F)
2003	2.8 C (37.0 F)
2004	6.5 C (43.7 F)

Wettest day (Rx1day)

The wettest day of the year at Swan Island Lighthouse, 1878 to 2004. The record is 98.0 mm (3.9 in) in 1971, marked on the chart; the median year is 37.6 mm (1.5 in).

Wettest day (Rx1day) at Swan Island Lighthouse by year
Year	Wettest day (Rx1day)
1878	0.0 mm (0.00 in)
1895	0.0 mm (0.00 in)
1900	0.0 mm (0.00 in)
1907	29.7 mm (1.2 in)
1908	24.1 mm (0.9 in)
1909	41.1 mm (1.6 in)
1910	45.7 mm (1.8 in)
1911	41.9 mm (1.6 in)
1912	37.1 mm (1.5 in)
1913	26.2 mm (1.0 in)
1914	79.2 mm (3.1 in)
1915	23.4 mm (0.9 in)
1916	40.6 mm (1.6 in)
1917	67.3 mm (2.6 in)
1918	25.4 mm (1.0 in)
1919	43.2 mm (1.7 in)
1920	57.2 mm (2.3 in)
1921	29.2 mm (1.1 in)
1922	29.7 mm (1.2 in)
1923	34.3 mm (1.4 in)
1924	45.2 mm (1.8 in)
1925	28.4 mm (1.1 in)
1926	27.4 mm (1.1 in)
1927	72.6 mm (2.9 in)
1928	34.0 mm (1.3 in)
1929	56.6 mm (2.2 in)
1930	39.1 mm (1.5 in)
1931	75.4 mm (3.0 in)
1932	35.6 mm (1.4 in)
1933	38.1 mm (1.5 in)
1934	32.5 mm (1.3 in)
1935	37.6 mm (1.5 in)
1936	31.2 mm (1.2 in)
1937	34.0 mm (1.3 in)
1938	45.5 mm (1.8 in)
1939	80.3 mm (3.2 in)
1940	46.5 mm (1.8 in)
1941	36.6 mm (1.4 in)
1942	41.1 mm (1.6 in)
1943	27.4 mm (1.1 in)
1944	34.3 mm (1.4 in)
1945	29.2 mm (1.1 in)
1946	92.7 mm (3.6 in)
1947	38.1 mm (1.5 in)
1948	96.8 mm (3.8 in)
1949	49.3 mm (1.9 in)
1950	33.0 mm (1.3 in)
1951	22.9 mm (0.9 in)
1952	62.2 mm (2.4 in)
1953	25.9 mm (1.0 in)
1954	41.4 mm (1.6 in)
1955	87.4 mm (3.4 in)
1956	45.2 mm (1.8 in)
1957	37.6 mm (1.5 in)
1958	34.5 mm (1.4 in)
1959	25.9 mm (1.0 in)
1960	96.8 mm (3.8 in)
1961	27.7 mm (1.1 in)
1962	28.2 mm (1.1 in)
1963	19.3 mm (0.8 in)
1964	65.8 mm (2.6 in)
1965	33.0 mm (1.3 in)
1966	34.3 mm (1.4 in)
1967	34.8 mm (1.4 in)
1968	31.0 mm (1.2 in)
1969	35.8 mm (1.4 in)
1970	51.3 mm (2.0 in)
1971	98.0 mm (3.9 in)
1972	38.4 mm (1.5 in)
1973	48.8 mm (1.9 in)
1974	73.2 mm (2.9 in)
1975	49.0 mm (1.9 in)
1976	25.4 mm (1.0 in)
1977	55.8 mm (2.2 in)
1978	27.0 mm (1.1 in)
1979	35.0 mm (1.4 in)
1980	40.0 mm (1.6 in)
1981	42.0 mm (1.7 in)
1982	60.4 mm (2.4 in)
1983	32.0 mm (1.3 in)
1984	26.8 mm (1.1 in)
1985	32.6 mm (1.3 in)
1986	37.0 mm (1.5 in)
1987	69.7 mm (2.7 in)
1988	49.4 mm (1.9 in)
1989	33.4 mm (1.3 in)
1990	46.0 mm (1.8 in)
1991	34.6 mm (1.4 in)
1992	39.2 mm (1.5 in)
1993	69.8 mm (2.7 in)
1994	21.4 mm (0.8 in)
1995	38.4 mm (1.5 in)
1996	35.6 mm (1.4 in)
1997	33.0 mm (1.3 in)
1998	68.6 mm (2.7 in)
1999	76.0 mm (3.0 in)
2000	48.4 mm (1.9 in)
2001	49.0 mm (1.9 in)
2002	29.0 mm (1.1 in)
2003	51.6 mm (2.0 in)
2004	23.0 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Swan Island Lighthouse, 1878 to 2004. The record is 169.6 mm (6.7 in) in 1971, marked on the chart; the median year is 59.7 mm (2.4 in).

Wettest five days (Rx5day) at Swan Island Lighthouse by year
Year	Wettest five days (Rx5day)
1878	0.0 mm (0.00 in)
1895	0.0 mm (0.00 in)
1900	0.0 mm (0.00 in)
1907	63.2 mm (2.5 in)
1908	26.7 mm (1.1 in)
1909	46.5 mm (1.8 in)
1910	71.0 mm (2.8 in)
1911	84.9 mm (3.3 in)
1912	48.6 mm (1.9 in)
1913	35.3 mm (1.4 in)
1914	91.6 mm (3.6 in)
1915	58.9 mm (2.3 in)
1916	106.1 mm (4.2 in)
1917	89.5 mm (3.5 in)
1918	44.5 mm (1.8 in)
1919	51.9 mm (2.0 in)
1920	75.8 mm (3.0 in)
1921	50.8 mm (2.0 in)
1922	59.7 mm (2.4 in)
1923	44.7 mm (1.8 in)
1924	87.6 mm (3.4 in)
1925	34.3 mm (1.4 in)
1926	57.6 mm (2.3 in)
1927	82.3 mm (3.2 in)
1928	67.3 mm (2.6 in)
1929	107.2 mm (4.2 in)
1930	65.1 mm (2.6 in)
1931	97.5 mm (3.8 in)
1932	60.1 mm (2.4 in)
1933	41.6 mm (1.6 in)
1934	59.0 mm (2.3 in)
1935	70.1 mm (2.8 in)
1936	55.6 mm (2.2 in)
1937	57.6 mm (2.3 in)
1938	52.1 mm (2.1 in)
1939	119.4 mm (4.7 in)
1940	47.5 mm (1.9 in)
1941	39.7 mm (1.6 in)
1942	77.2 mm (3.0 in)
1943	48.7 mm (1.9 in)
1944	40.6 mm (1.6 in)
1945	45.0 mm (1.8 in)
1946	93.3 mm (3.7 in)
1947	56.1 mm (2.2 in)
1948	128.6 mm (5.1 in)
1949	66.6 mm (2.6 in)
1950	47.2 mm (1.9 in)
1951	29.5 mm (1.2 in)
1952	68.9 mm (2.7 in)
1953	40.4 mm (1.6 in)
1954	60.2 mm (2.4 in)
1955	110.2 mm (4.3 in)
1956	74.0 mm (2.9 in)
1957	40.5 mm (1.6 in)
1958	61.2 mm (2.4 in)
1959	52.6 mm (2.1 in)
1960	130.8 mm (5.1 in)
1961	45.2 mm (1.8 in)
1962	82.2 mm (3.2 in)
1963	52.6 mm (2.1 in)
1964	79.0 mm (3.1 in)
1965	80.6 mm (3.2 in)
1966	78.9 mm (3.1 in)
1967	80.7 mm (3.2 in)
1968	50.0 mm (2.0 in)
1969	49.7 mm (2.0 in)
1970	107.4 mm (4.2 in)
1971	169.6 mm (6.7 in)
1972	42.2 mm (1.7 in)
1973	88.7 mm (3.5 in)
1974	88.6 mm (3.5 in)
1975	74.8 mm (2.9 in)
1976	67.9 mm (2.7 in)
1977	72.6 mm (2.9 in)
1978	50.5 mm (2.0 in)
1979	37.2 mm (1.5 in)
1980	56.6 mm (2.2 in)
1981	54.6 mm (2.1 in)
1982	77.0 mm (3.0 in)
1983	59.8 mm (2.4 in)
1984	73.6 mm (2.9 in)
1985	57.4 mm (2.3 in)
1986	88.8 mm (3.5 in)
1987	80.7 mm (3.2 in)
1988	78.8 mm (3.1 in)
1989	53.2 mm (2.1 in)
1990	46.0 mm (1.8 in)
1991	47.0 mm (1.9 in)
1992	69.0 mm (2.7 in)
1993	93.8 mm (3.7 in)
1994	34.8 mm (1.4 in)
1995	44.4 mm (1.7 in)
1996	41.8 mm (1.6 in)
1997	54.2 mm (2.1 in)
1998	100.0 mm (3.9 in)
1999	92.6 mm (3.6 in)
2000	91.8 mm (3.6 in)
2001	58.8 mm (2.3 in)
2002	32.4 mm (1.3 in)
2003	77.8 mm (3.1 in)
2004	26.2 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Swan Island Lighthouse, 1878 to 2004. The record is 44 days in 1992, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Swan Island Lighthouse by year
Year	Longest dry spell (CDD)
1878	31 days
1895	30 days
1900	28 days
1907	21 days
1908	18 days
1909	21 days
1910	24 days
1911	33 days
1912	26 days
1913	28 days
1914	31 days
1915	30 days
1916	18 days
1917	17 days
1918	19 days
1919	21 days
1920	17 days
1921	19 days
1922	18 days
1923	27 days
1924	13 days
1925	20 days
1926	30 days
1927	22 days
1928	19 days
1929	15 days
1930	19 days
1931	31 days
1932	18 days
1933	19 days
1934	20 days
1935	21 days
1936	17 days
1937	23 days
1938	18 days
1939	43 days
1940	24 days
1941	27 days
1942	24 days
1943	31 days
1944	15 days
1945	28 days
1946	17 days
1947	15 days
1948	33 days
1949	19 days
1950	23 days
1951	15 days
1952	28 days
1953	21 days
1954	27 days
1955	27 days
1956	23 days
1957	22 days
1958	21 days
1959	31 days
1960	22 days
1961	24 days
1962	25 days
1963	33 days
1964	20 days
1965	37 days
1966	16 days
1967	21 days
1968	26 days
1969	20 days
1970	26 days
1971	18 days
1972	22 days
1973	16 days
1974	26 days
1975	17 days
1976	17 days
1977	31 days
1978	16 days
1979	23 days
1980	21 days
1981	16 days
1982	23 days
1983	32 days
1984	17 days
1985	21 days
1986	18 days
1987	37 days
1988	31 days
1989	21 days
1990	21 days
1991	27 days
1992	44 days
1993	19 days
1994	21 days
1995	23 days
1996	22 days
1997	17 days
1998	24 days
1999	17 days
2000	25 days
2001	20 days
2002	26 days
2003	24 days
2004	19 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

95 years, 1908 to 2003

A day with at least 39.4 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 119.7 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Swan Island Lighthouse: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	39.4 mm (1.6 in)
5 years	55.0 mm (2.2 in)
10 years	67.4 mm (2.7 in)
25 years	85.8 mm (3.4 in)
50 years	101.7 mm (4.0 in)
100 years	119.7 mm (4.7 in)	Longer than the 95 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, 95 years of values from 1908 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: 98.0 mm (3.9 in) in 1971; 96.8 mm (3.8 in) in 1948; 96.8 mm (3.8 in) in 1960.

Download the Data

Data for Swan Island Lighthouse standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Swan Island Lighthouse 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).