Rottnest Island Lighthouse Weather Records (ASN00009038)

Record envelope, standing records and threshold days for Rottnest Island Lighthouse (ASN00009038), Australia, with 115 years of record.

Key Facts for Rottnest Island Lighthouse

Rottnest Island Lighthouse (ASN00009038) is a weather station in Australia at -32.01 latitude and 115.50 longitude, 46 m (151 ft) above sea level.
The station reports from 1881 to 1995, 115 years of record.
1,464 records set at Rottnest Island Lighthouse still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Rottnest Island Lighthouse set a daily record low maximum temperature of 19.9 C (67.8 F) on 8 December 1995.

About the Station

Location: Australia, -32.01 latitude, 115.50 longitude.
Elevation: 46 m (151 ft).
Period of record: 1881 to 1995, 115 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 Rottnest 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 Rottnest Island Lighthouse, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	41.2 C (106.2 F)	12.1 C (53.8 F)	n/a	n/a
Feb	41.4 C (106.5 F)	9.7 C (49.5 F)	n/a	n/a
Mar	38.0 C (100.4 F)	7.9 C (46.2 F)	n/a	n/a
Apr	34.4 C (93.9 F)	8.5 C (47.3 F)	n/a	n/a
May	27.7 C (81.9 F)	2.8 C (37.0 F)	n/a	n/a
Jun	24.0 C (75.2 F)	6.2 C (43.2 F)	n/a	n/a
Jul	23.2 C (73.8 F)	4.8 C (40.6 F)	n/a	n/a
Aug	23.3 C (73.9 F)	3.9 C (39.0 F)	n/a	n/a
Sep	29.0 C (84.2 F)	5.3 C (41.5 F)	n/a	n/a
Oct	33.1 C (91.6 F)	5.7 C (42.3 F)	n/a	n/a
Nov	35.0 C (95.0 F)	6.5 C (43.7 F)	n/a	n/a
Dec	37.9 C (100.2 F)	7.6 C (45.7 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Rottnest Island Lighthouse still stand. 1968 holds the most, with 78.

Standing records at Rottnest Island Lighthouse by the year they were set
Year set	Standing records
1965	43
1966	49
1967	45
1968	78
1969	54
1970	39
1971	49
1972	58
1973	49
1974	32
1975	35
1976	60
1977	42
1978	53
1979	43
1980	32
1981	54
1982	53
1983	33
1984	42
1985	61
1986	28
1987	59
1988	47
1989	48
1990	60
1991	59
1992	35
1993	28
1994	60
1995	36

All-Time Record Progression

3 new records

3 all-time records were set at Rottnest Island Lighthouse between 19 April 1946 and 9 February 1992. Each dot is a new record.

When Rottnest Island Lighthouse set new all-time records
Date	Kind	Detail
1946-04-19	Record daily precipitation	Record daily precipitation 83.8 mm (3.3 in)
1947-05-03	Record daily precipitation	Record daily precipitation 113.3 mm (4.5 in)
1992-02-09	Record daily precipitation	Record daily precipitation 157.6 mm (6.2 in)

Wettest Day of Each Month

Feb: 157.6 mm (6.2 in)

The wettest day on record for each calendar month at Rottnest Island Lighthouse. The most was 157.6 mm (6.2 in) on 9 February 1992.

Record daily precipitation for each month at Rottnest Island Lighthouse
Month	Record daily precipitation (mm)	Date
Jan	79.4 mm (3.1 in)	21 January 1982
Feb	157.6 mm (6.2 in)	9 February 1992
Mar	72.1 mm (2.8 in)	26 March 1923
Apr	83.8 mm (3.3 in)	19 April 1946
May	113.3 mm (4.5 in)	3 May 1947
Jun	77.2 mm (3.0 in)	1 June 1911
Jul	76.4 mm (3.0 in)	29 July 1987
Aug	80.8 mm (3.2 in)	6 August 1934
Sep	45.6 mm (1.8 in)	14 September 1984
Oct	52.6 mm (2.1 in)	18 October 1995
Nov	26.9 mm (1.1 in)	29 November 1956
Dec	45.7 mm (1.8 in)	18 December 1936

Period of Record Coverage

1965 to 1995

31 years of record at Rottnest Island Lighthouse, 1965 to 1995. Every year has data for at least 90 percent of its days.

Days with data per year at Rottnest Island Lighthouse
Year	Days with data	Share of year	Complete
1965	355	97%	Yes
1966	365	100%	Yes
1967	361	99%	Yes
1968	361	99%	Yes
1969	365	100%	Yes
1970	339	93%	Yes
1971	365	100%	Yes
1972	354	97%	Yes
1973	362	99%	Yes
1974	365	100%	Yes
1975	361	99%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	363	99%	Yes
1980	364	99%	Yes
1981	364	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	365	100%	Yes
1985	357	98%	Yes
1986	363	99%	Yes
1987	362	99%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	356	98%	Yes
1991	359	98%	Yes
1992	360	98%	Yes
1993	361	99%	Yes
1994	343	94%	Yes
1995	348	95%	Yes

Latest Records

Latest records at Rottnest Island Lighthouse
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 December 1995	Rottnest Island Lighthouse, AU	daily low max	19.9 C (67.8 F)	1.1 C (2.0 F)	12 years	8 of 100 (Routine)
3 December 1995	Rottnest Island Lighthouse, AU	daily low max	19.6 C (67.3 F)	0.3 C (0.5 F)	16 years	8 of 100 (Routine)
9 November 1995	Rottnest Island Lighthouse, AU	daily low min	9.3 C (48.7 F)	1.7 C (3.1 F)	2 years	10 of 100 (Routine)
8 November 1995	Rottnest Island Lighthouse, AU	daily low min	10.0 C (50.0 F)	1.2 C (2.2 F)	10 years	11 of 100 (Routine)
8 November 1995	Rottnest Island Lighthouse, AU	daily low max	16.1 C (61.0 F)	1.0 C (1.8 F)	2 years	6 of 100 (Routine)
30 October 1995	Rottnest Island Lighthouse, AU	daily rain	17.0 mm (0.7 in)	10.1 mm (0.4 in)	54 years	20 of 100 (Routine)
18 October 1995	Rottnest Island Lighthouse, AU	monthly rain	52.6 mm (2.1 in)	4.1 mm (0.16 in)	47 years	42 of 100 (Notable)
15 October 1995	Rottnest Island Lighthouse, AU	daily high min	16.8 C (62.2 F)	1.2 C (2.2 F)	28 years	16 of 100 (Routine)
14 October 1995	Rottnest Island Lighthouse, AU	daily high max	31.1 C (88.0 F)	5.3 C (9.5 F)	13 years	25 of 100 (Routine)
24 September 1995	Rottnest Island Lighthouse, AU	daily high max	22.4 C (72.3 F)	1.2 C (2.2 F)	25 years	15 of 100 (Routine)
6 September 1995	Rottnest Island Lighthouse, AU	daily rain	22.0 mm (0.9 in)	7.8 mm (0.31 in)	64 years	20 of 100 (Routine)
3 September 1995	Rottnest Island Lighthouse, AU	daily rain	30.2 mm (1.2 in)	13.9 mm (0.5 in)	48 years	52 of 100 (Notable)
30 August 1995	Rottnest Island Lighthouse, AU	daily low max	14.2 C (57.6 F)	0.4 C (0.7 F)	10 years	8 of 100 (Routine)
28 August 1995	Rottnest Island Lighthouse, AU	daily high max	20.7 C (69.3 F)	1.2 C (2.2 F)	12 years	12 of 100 (Routine)
28 August 1995	Rottnest Island Lighthouse, AU	daily high min	15.0 C (59.0 F)	0.3 C (0.5 F)	12 years	7 of 100 (Routine)
27 August 1995	Rottnest Island Lighthouse, AU	daily high max	21.4 C (70.5 F)	0.6 C (1.1 F)	12 years	9 of 100 (Routine)
16 August 1995	Rottnest Island Lighthouse, AU	daily high min	17.0 C (62.6 F)	2.0 C (3.6 F)	28 years	21 of 100 (Routine)
15 August 1995	Rottnest Island Lighthouse, AU	daily high min	15.3 C (59.5 F)	1.2 C (2.2 F)	17 years	14 of 100 (Routine)
9 July 1995	Rottnest Island Lighthouse, AU	daily low min	7.9 C (46.2 F)	0.6 C (1.1 F)	0 years	6 of 100 (Routine)
11 June 1995	Rottnest Island Lighthouse, AU	daily low max	16.3 C (61.3 F)	0.2 C (0.4 F)	14 years	8 of 100 (Routine)

Climate Trend

27 complete years, 1965 to 1993

One stripe for each of 27 complete years at Rottnest Island Lighthouse, 1965 to 1993. Blue stripes are years cooler than the station's own mean of 18.4 C (65.1 F); red stripes are warmer. The coolest year was 1968, at 17.3 C (63.2 F), and the warmest was 1983, at 19.2 C (66.6 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Rottnest Island Lighthouse as warming stripes, 1965 to 1993
Year	Annual mean temperature	Difference from the station mean
1965	18.5 C	+0.10 C
1966	18.2 C	-0.23 C
1967	18.8 C	+0.44 C
1968	17.3 C	-1.06 C
1969	18.3 C	-0.09 C
1971	17.7 C	-0.69 C
1972	19.0 C	+0.61 C
1973	18.1 C	-0.32 C
1974	18.3 C	-0.05 C
1975	18.4 C	+0.05 C
1976	18.9 C	+0.48 C
1977	18.5 C	+0.08 C
1978	19.0 C	+0.65 C
1979	18.4 C	+0.02 C
1980	18.1 C	-0.27 C
1981	18.1 C	-0.30 C
1982	18.4 C	-0.03 C
1983	19.2 C	+0.82 C
1984	18.4 C	-0.04 C
1985	18.9 C	+0.49 C
1986	17.7 C	-0.68 C
1987	18.3 C	-0.13 C
1988	19.1 C	+0.67 C
1989	18.7 C	+0.28 C
1990	17.9 C	-0.51 C
1991	18.4 C	+0.04 C
1993	18.0 C	-0.44 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

1881 to 1995

Yearly extremes at Rottnest Island Lighthouse: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.4 C (106.5 F)	1985	37.9 C (100.2 F)	31
Coldest night (TNn)	2.8 C (37.0 F)	1990	6.5 C (43.7 F)	31
Wettest day (Rx1day)	157.6 mm (6.2 in)	1992	42.9 mm (1.7 in)	103
Wettest five days (Rx5day)	167.9 mm (6.6 in)	1955	72.5 mm (2.9 in)	103
Longest dry spell (CDD)	111 days	1911	47 days	103

Hottest day (TXx)

The hottest day of the year at Rottnest Island Lighthouse, 1881 to 1995. The record is 41.4 C (106.5 F) in 1985, marked on the chart; the median year is 37.9 C (100.2 F).

Hottest day (TXx) at Rottnest Island Lighthouse by year
Year	Hottest day (TXx)
1881	n/a
1882	n/a
1883	n/a
1885	n/a
1886	n/a
1887	n/a
1888	n/a
1890	n/a
1891	n/a
1892	n/a
1894	n/a
1895	n/a
1898	n/a
1901	n/a
1903	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	40.0 C (104.0 F)
1966	37.9 C (100.2 F)
1967	37.6 C (99.7 F)
1968	41.2 C (106.2 F)
1969	37.4 C (99.3 F)
1970	37.9 C (100.2 F)
1971	35.3 C (95.5 F)
1972	37.9 C (100.2 F)
1973	39.1 C (102.4 F)
1974	37.2 C (99.0 F)
1975	38.3 C (100.9 F)
1976	36.8 C (98.2 F)
1977	40.1 C (104.2 F)
1978	37.2 C (99.0 F)
1979	39.1 C (102.4 F)
1980	36.9 C (98.4 F)
1981	40.2 C (104.4 F)
1982	40.6 C (105.1 F)
1983	38.3 C (100.9 F)
1984	38.3 C (100.9 F)
1985	41.4 C (106.5 F)
1986	39.6 C (103.3 F)
1987	36.1 C (97.0 F)
1988	36.5 C (97.7 F)
1989	40.7 C (105.3 F)
1990	38.0 C (100.4 F)
1991	41.1 C (106.0 F)
1992	36.4 C (97.5 F)
1993	36.8 C (98.2 F)
1994	37.9 C (100.2 F)
1995	36.3 C (97.3 F)

Coldest night (TNn)

The coldest night of the year at Rottnest Island Lighthouse, 1881 to 1995. The record is 2.8 C (37.0 F) in 1990, marked on the chart; the median year is 6.5 C (43.7 F).

Coldest night (TNn) at Rottnest Island Lighthouse by year
Year	Coldest night (TNn)
1881	n/a
1882	n/a
1883	n/a
1885	n/a
1886	n/a
1887	n/a
1888	n/a
1890	n/a
1891	n/a
1892	n/a
1894	n/a
1895	n/a
1898	n/a
1901	n/a
1903	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	6.4 C (43.5 F)
1966	6.3 C (43.3 F)
1967	6.3 C (43.3 F)
1968	6.1 C (43.0 F)
1969	8.0 C (46.4 F)
1970	5.3 C (41.5 F)
1971	7.8 C (46.0 F)
1972	7.0 C (44.6 F)
1973	7.3 C (45.1 F)
1974	8.2 C (46.8 F)
1975	5.6 C (42.1 F)
1976	4.5 C (40.1 F)
1977	7.0 C (44.6 F)
1978	6.4 C (43.5 F)
1979	6.5 C (43.7 F)
1980	7.8 C (46.0 F)
1981	6.7 C (44.1 F)
1982	7.4 C (45.3 F)
1983	8.2 C (46.8 F)
1984	7.5 C (45.5 F)
1985	5.2 C (41.4 F)
1986	5.7 C (42.3 F)
1987	3.9 C (39.0 F)
1988	6.2 C (43.2 F)
1989	8.4 C (47.1 F)
1990	2.8 C (37.0 F)
1991	5.5 C (41.9 F)
1992	6.5 C (43.7 F)
1993	7.9 C (46.2 F)
1994	8.5 C (47.3 F)
1995	7.0 C (44.6 F)

Wettest day (Rx1day)

The wettest day of the year at Rottnest Island Lighthouse, 1881 to 1995. The record is 157.6 mm (6.2 in) in 1992, marked on the chart; the median year is 42.9 mm (1.7 in).

Wettest day (Rx1day) at Rottnest Island Lighthouse by year
Year	Wettest day (Rx1day)
1881	0.0 mm (0.00 in)
1882	0.0 mm (0.00 in)
1883	0.0 mm (0.00 in)
1885	0.0 mm (0.00 in)
1886	0.0 mm (0.00 in)
1887	0.0 mm (0.00 in)
1888	0.0 mm (0.00 in)
1890	0.0 mm (0.00 in)
1891	0.0 mm (0.00 in)
1892	0.0 mm (0.00 in)
1894	0.0 mm (0.00 in)
1895	0.0 mm (0.00 in)
1898	0.0 mm (0.00 in)
1901	0.0 mm (0.00 in)
1903	0.0 mm (0.00 in)
1907	38.1 mm (1.5 in)
1908	46.2 mm (1.8 in)
1909	33.0 mm (1.3 in)
1910	38.9 mm (1.5 in)
1911	77.2 mm (3.0 in)
1912	73.9 mm (2.9 in)
1913	37.6 mm (1.5 in)
1914	26.4 mm (1.0 in)
1915	80.3 mm (3.2 in)
1916	39.9 mm (1.6 in)
1917	26.4 mm (1.0 in)
1918	56.6 mm (2.2 in)
1919	55.6 mm (2.2 in)
1920	67.6 mm (2.7 in)
1921	48.3 mm (1.9 in)
1922	49.5 mm (1.9 in)
1923	72.1 mm (2.8 in)
1924	55.9 mm (2.2 in)
1925	38.1 mm (1.5 in)
1926	34.3 mm (1.4 in)
1927	62.2 mm (2.4 in)
1928	44.5 mm (1.8 in)
1929	51.8 mm (2.0 in)
1930	52.3 mm (2.1 in)
1931	43.7 mm (1.7 in)
1932	42.9 mm (1.7 in)
1933	41.7 mm (1.6 in)
1934	80.8 mm (3.2 in)
1935	31.2 mm (1.2 in)
1936	45.7 mm (1.8 in)
1937	56.4 mm (2.2 in)
1938	34.3 mm (1.4 in)
1939	42.9 mm (1.7 in)
1940	24.9 mm (1.0 in)
1941	34.0 mm (1.3 in)
1942	37.6 mm (1.5 in)
1943	48.3 mm (1.9 in)
1944	43.9 mm (1.7 in)
1945	34.8 mm (1.4 in)
1946	83.8 mm (3.3 in)
1947	113.3 mm (4.5 in)
1948	52.1 mm (2.1 in)
1949	52.6 mm (2.1 in)
1950	53.6 mm (2.1 in)
1951	32.5 mm (1.3 in)
1952	65.3 mm (2.6 in)
1953	43.2 mm (1.7 in)
1954	47.2 mm (1.9 in)
1955	75.4 mm (3.0 in)
1956	42.4 mm (1.7 in)
1957	53.8 mm (2.1 in)
1958	37.1 mm (1.5 in)
1959	46.0 mm (1.8 in)
1960	28.7 mm (1.1 in)
1961	48.0 mm (1.9 in)
1962	37.6 mm (1.5 in)
1963	42.7 mm (1.7 in)
1964	49.5 mm (1.9 in)
1965	46.5 mm (1.8 in)
1966	43.4 mm (1.7 in)
1967	n/a
1968	46.2 mm (1.8 in)
1969	36.8 mm (1.4 in)
1970	46.0 mm (1.8 in)
1971	27.7 mm (1.1 in)
1972	29.5 mm (1.2 in)
1973	25.7 mm (1.0 in)
1974	30.0 mm (1.2 in)
1975	30.8 mm (1.2 in)
1976	28.3 mm (1.1 in)
1977	24.2 mm (1.0 in)
1978	49.4 mm (1.9 in)
1979	37.6 mm (1.5 in)
1980	38.6 mm (1.5 in)
1981	38.4 mm (1.5 in)
1982	79.4 mm (3.1 in)
1983	63.2 mm (2.5 in)
1984	45.6 mm (1.8 in)
1985	33.0 mm (1.3 in)
1986	65.4 mm (2.6 in)
1987	76.4 mm (3.0 in)
1988	50.2 mm (2.0 in)
1989	70.2 mm (2.8 in)
1990	30.0 mm (1.2 in)
1991	41.6 mm (1.6 in)
1992	157.6 mm (6.2 in)
1993	65.0 mm (2.6 in)
1994	70.0 mm (2.8 in)
1995	52.6 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Rottnest Island Lighthouse, 1881 to 1995. The record is 167.9 mm (6.6 in) in 1955, marked on the chart; the median year is 72.5 mm (2.9 in).

Wettest five days (Rx5day) at Rottnest Island Lighthouse by year
Year	Wettest five days (Rx5day)
1881	0.0 mm (0.00 in)
1882	0.0 mm (0.00 in)
1883	0.0 mm (0.00 in)
1885	0.0 mm (0.00 in)
1886	0.0 mm (0.00 in)
1887	0.0 mm (0.00 in)
1888	0.0 mm (0.00 in)
1890	0.0 mm (0.00 in)
1891	0.0 mm (0.00 in)
1892	0.0 mm (0.00 in)
1894	0.0 mm (0.00 in)
1895	0.0 mm (0.00 in)
1898	0.0 mm (0.00 in)
1901	0.0 mm (0.00 in)
1903	0.0 mm (0.00 in)
1907	69.6 mm (2.7 in)
1908	74.4 mm (2.9 in)
1909	95.9 mm (3.8 in)
1910	66.1 mm (2.6 in)
1911	96.0 mm (3.8 in)
1912	107.2 mm (4.2 in)
1913	91.6 mm (3.6 in)
1914	42.1 mm (1.7 in)
1915	92.7 mm (3.6 in)
1916	63.8 mm (2.5 in)
1917	72.1 mm (2.8 in)
1918	88.5 mm (3.5 in)
1919	78.1 mm (3.1 in)
1920	104.9 mm (4.1 in)
1921	100.8 mm (4.0 in)
1922	95.0 mm (3.7 in)
1923	73.1 mm (2.9 in)
1924	68.9 mm (2.7 in)
1925	71.7 mm (2.8 in)
1926	75.5 mm (3.0 in)
1927	71.5 mm (2.8 in)
1928	110.8 mm (4.4 in)
1929	98.3 mm (3.9 in)
1930	106.2 mm (4.2 in)
1931	85.4 mm (3.4 in)
1932	92.7 mm (3.6 in)
1933	80.0 mm (3.1 in)
1934	95.5 mm (3.8 in)
1935	90.9 mm (3.6 in)
1936	62.2 mm (2.4 in)
1937	83.1 mm (3.3 in)
1938	60.2 mm (2.4 in)
1939	97.2 mm (3.8 in)
1940	45.0 mm (1.8 in)
1941	62.9 mm (2.5 in)
1942	81.6 mm (3.2 in)
1943	72.5 mm (2.9 in)
1944	46.7 mm (1.8 in)
1945	103.2 mm (4.1 in)
1946	92.2 mm (3.6 in)
1947	166.1 mm (6.5 in)
1948	80.9 mm (3.2 in)
1949	90.5 mm (3.6 in)
1950	72.3 mm (2.8 in)
1951	72.0 mm (2.8 in)
1952	78.5 mm (3.1 in)
1953	71.9 mm (2.8 in)
1954	82.1 mm (3.2 in)
1955	167.9 mm (6.6 in)
1956	78.4 mm (3.1 in)
1957	115.1 mm (4.5 in)
1958	75.8 mm (3.0 in)
1959	74.4 mm (2.9 in)
1960	55.1 mm (2.2 in)
1961	69.0 mm (2.7 in)
1962	66.5 mm (2.6 in)
1963	80.6 mm (3.2 in)
1964	96.0 mm (3.8 in)
1965	70.1 mm (2.8 in)
1966	75.4 mm (3.0 in)
1967	n/a
1968	72.5 mm (2.9 in)
1969	55.9 mm (2.2 in)
1970	50.7 mm (2.0 in)
1971	57.7 mm (2.3 in)
1972	50.1 mm (2.0 in)
1973	51.8 mm (2.0 in)
1974	56.4 mm (2.2 in)
1975	53.0 mm (2.1 in)
1976	36.3 mm (1.4 in)
1977	37.9 mm (1.5 in)
1978	81.4 mm (3.2 in)
1979	77.2 mm (3.0 in)
1980	79.3 mm (3.1 in)
1981	69.0 mm (2.7 in)
1982	134.4 mm (5.3 in)
1983	70.2 mm (2.8 in)
1984	57.8 mm (2.3 in)
1985	72.4 mm (2.9 in)
1986	149.2 mm (5.9 in)
1987	86.2 mm (3.4 in)
1988	59.4 mm (2.3 in)
1989	77.6 mm (3.1 in)
1990	40.2 mm (1.6 in)
1991	118.6 mm (4.7 in)
1992	161.4 mm (6.4 in)
1993	74.0 mm (2.9 in)
1994	89.8 mm (3.5 in)
1995	67.6 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Rottnest Island Lighthouse, 1881 to 1995. The record is 111 days in 1911, marked on the chart; the median year is 47 days.

Longest dry spell (CDD) at Rottnest Island Lighthouse by year
Year	Longest dry spell (CDD)
1881	28 days
1882	28 days
1883	31 days
1885	31 days
1886	31 days
1887	31 days
1888	31 days
1890	31 days
1891	59 days
1892	31 days
1894	31 days
1895	31 days
1898	31 days
1901	31 days
1903	28 days
1907	60 days
1908	38 days
1909	79 days
1910	105 days
1911	111 days
1912	43 days
1913	65 days
1914	47 days
1915	43 days
1916	34 days
1917	40 days
1918	26 days
1919	46 days
1920	72 days
1921	41 days
1922	58 days
1923	63 days
1924	45 days
1925	47 days
1926	45 days
1927	61 days
1928	45 days
1929	42 days
1930	60 days
1931	63 days
1932	62 days
1933	47 days
1934	40 days
1935	38 days
1936	61 days
1937	63 days
1938	40 days
1939	52 days
1940	30 days
1941	51 days
1942	53 days
1943	35 days
1944	86 days
1945	28 days
1946	65 days
1947	42 days
1948	88 days
1949	46 days
1950	82 days
1951	44 days
1952	62 days
1953	49 days
1954	33 days
1955	43 days
1956	59 days
1957	50 days
1958	50 days
1959	40 days
1960	47 days
1961	25 days
1962	61 days
1963	37 days
1964	43 days
1965	69 days
1966	69 days
1967	n/a
1968	32 days
1969	58 days
1970	48 days
1971	33 days
1972	82 days
1973	74 days
1974	92 days
1975	78 days
1976	51 days
1977	69 days
1978	39 days
1979	73 days
1980	51 days
1981	48 days
1982	45 days
1983	38 days
1984	52 days
1985	57 days
1986	44 days
1987	70 days
1988	69 days
1989	40 days
1990	26 days
1991	55 days
1992	31 days
1993	49 days
1994	46 days
1995	82 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

88 years, 1907 to 1995

A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 121.4 mm (4.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Rottnest 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	44.7 mm (1.8 in)
5 years	60.9 mm (2.4 in)
10 years	73.1 mm (2.9 in)
25 years	90.6 mm (3.6 in)
50 years	105.3 mm (4.1 in)
100 years	121.4 mm (4.8 in)	Longer than the 88 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, 88 years of values from 1907 to 1995.

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: 157.6 mm (6.2 in) in 1992; 113.3 mm (4.5 in) in 1947; 83.8 mm (3.3 in) in 1946.

Download the Data

Data for Rottnest Island Lighthouse standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rottnest 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).