Osterley Weather Records (ASN00095016)

Record envelope, standing records and threshold days for Osterley (ASN00095016), Australia, with 116 years of record.

Key Facts for Osterley

Osterley (ASN00095016) is a weather station in Australia at -42.34 latitude and 146.75 longitude, 415 m (1,362 ft) above sea level.
The station reports from 1910 to 2025, 116 years of record.
0 records set at Osterley still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Osterley set a daily record precipitation of 21.8 mm (0.9 in) on 13 March 2025.

About the Station

Location: Australia, -42.34 latitude, 146.75 longitude.
Elevation: 415 m (1,362 ft).
Period of record: 1910 to 2025, 116 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 Osterley. 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 Osterley, 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 Osterley still stand.

All-Time Record Progression

2 new records

2 all-time records were set at Osterley between 19 February 1946 and 23 April 1960. Each dot is a new record.

When Osterley set new all-time records
Date	Kind	Detail
1946-02-19	Record daily precipitation	Record daily precipitation 91.4 mm (3.6 in)
1960-04-23	Record daily precipitation	Record daily precipitation 111.0 mm (4.4 in)

Wettest Day of Each Month

Apr: 111.0 mm (4.4 in)

The wettest day on record for each calendar month at Osterley. The most was 111.0 mm (4.4 in) on 23 April 1960.

Record daily precipitation for each month at Osterley
Month	Record daily precipitation (mm)	Date
Jan	47.0 mm (1.9 in)	10 January 1972
Feb	91.4 mm (3.6 in)	19 February 1946
Mar	93.5 mm (3.7 in)	21 March 1970
Apr	111.0 mm (4.4 in)	23 April 1960
May	53.8 mm (2.1 in)	3 May 1956
Jun	55.6 mm (2.2 in)	23 June 2020
Jul	43.4 mm (1.7 in)	16 July 1921
Aug	59.0 mm (2.3 in)	12 August 2010
Sep	61.7 mm (2.4 in)	12 September 1920
Oct	53.3 mm (2.1 in)	20 October 1966
Nov	53.3 mm (2.1 in)	4 November 1943
Dec	65.5 mm (2.6 in)	12 December 1935

Latest Records

Latest records at Osterley
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 March 2025	Osterley, AU	daily rain	21.8 mm (0.9 in)	3.6 mm (0.14 in)	46 years	20 of 100 (Routine)
2 September 2024	Osterley, AU	daily rain	36.4 mm (1.4 in)	19.2 mm (0.8 in)	32 years	49 of 100 (Notable)
31 August 2024	Osterley, AU	daily rain	22.0 mm (0.9 in)	1.4 mm (0.06 in)	29 years	20 of 100 (Routine)
2 April 2024	Osterley, AU	daily rain	10.0 mm (0.4 in)	0.2 mm (0.01 in)	9 years	12 of 100 (Routine)
18 January 2024	Osterley, AU	daily rain	21.4 mm (0.8 in)	10.5 mm (0.4 in)	94 years	20 of 100 (Routine)
26 November 2023	Osterley, AU	daily rain	27.2 mm (1.1 in)	7.1 mm (0.28 in)	65 years	40 of 100 (Notable)
27 February 2023	Osterley, AU	daily rain	14.2 mm (0.6 in)	0.2 mm (0.01 in)	83 years	20 of 100 (Routine)
6 May 2022	Osterley, AU	daily rain	37.4 mm (1.5 in)	15.8 mm (0.6 in)	51 years	51 of 100 (Notable)
8 January 2022	Osterley, AU	daily rain	40.4 mm (1.6 in)	20.8 mm (0.8 in)	100 years	70 of 100 (Major)
11 November 2021	Osterley, AU	daily rain	23.4 mm (0.9 in)	2.3 mm (0.09 in)	106 years	20 of 100 (Routine)
29 October 2021	Osterley, AU	daily rain	43.4 mm (1.7 in)	27.7 mm (1.1 in)	86 years	75 of 100 (Major)
24 October 2021	Osterley, AU	daily rain	36.0 mm (1.4 in)	5.0 mm (0.20 in)	32 years	26 of 100 (Routine)
10 September 2021	Osterley, AU	daily rain	28.8 mm (1.1 in)	6.0 mm (0.24 in)	34 years	29 of 100 (Routine)
29 July 2021	Osterley, AU	daily rain	18.2 mm (0.7 in)	4.0 mm (0.16 in)	96 years	20 of 100 (Routine)
6 February 2021	Osterley, AU	daily rain	38.0 mm (1.5 in)	21.5 mm (0.8 in)	50 years	51 of 100 (Notable)
23 June 2020	Osterley, AU	monthly rain	55.6 mm (2.2 in)	9.4 mm (0.37 in)	10 years	37 of 100 (Notable)
23 January 2020	Osterley, AU	daily rain	23.0 mm (0.9 in)	8.0 mm (0.31 in)	22 years	20 of 100 (Routine)
22 August 2019	Osterley, AU	daily rain	21.4 mm (0.8 in)	3.1 mm (0.12 in)	72 years	20 of 100 (Routine)
12 July 2019	Osterley, AU	daily rain	25.0 mm (1.0 in)	4.7 mm (0.19 in)	90 years	45 of 100 (Notable)
15 June 2018	Osterley, AU	daily rain	16.0 mm (0.6 in)	0.5 mm (0.02 in)	83 years	20 of 100 (Routine)

Extremes by Year

1910 to 2025

Yearly extremes at Osterley: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	111.0 mm (4.4 in)	1960	36.0 mm (1.4 in)	115
Wettest five days (Rx5day)	205.0 mm (8.1 in)	1960	68.0 mm (2.7 in)	115
Longest dry spell (CDD)	43 days	2022	18 days	115

Wettest day (Rx1day)

The wettest day of the year at Osterley, 1910 to 2025. The record is 111.0 mm (4.4 in) in 1960, marked on the chart; the median year is 36.0 mm (1.4 in).

Wettest day (Rx1day) at Osterley by year
Year	Wettest day (Rx1day)
1910	28.7 mm (1.1 in)
1911	59.7 mm (2.4 in)
1912	31.0 mm (1.2 in)
1913	28.4 mm (1.1 in)
1914	19.1 mm (0.8 in)
1915	45.2 mm (1.8 in)
1916	47.5 mm (1.9 in)
1917	36.3 mm (1.4 in)
1918	30.5 mm (1.2 in)
1919	27.2 mm (1.1 in)
1920	61.7 mm (2.4 in)
1921	43.4 mm (1.7 in)
1922	50.8 mm (2.0 in)
1923	43.7 mm (1.7 in)
1924	33.5 mm (1.3 in)
1925	32.0 mm (1.3 in)
1926	33.0 mm (1.3 in)
1927	33.3 mm (1.3 in)
1928	55.6 mm (2.2 in)
1929	31.0 mm (1.2 in)
1930	29.7 mm (1.2 in)
1931	50.8 mm (2.0 in)
1932	40.4 mm (1.6 in)
1933	33.8 mm (1.3 in)
1934	40.4 mm (1.6 in)
1935	65.5 mm (2.6 in)
1936	27.4 mm (1.1 in)
1937	29.2 mm (1.1 in)
1938	78.2 mm (3.1 in)
1939	37.3 mm (1.5 in)
1940	24.6 mm (1.0 in)
1941	32.0 mm (1.3 in)
1942	35.6 mm (1.4 in)
1943	53.3 mm (2.1 in)
1944	33.0 mm (1.3 in)
1945	32.0 mm (1.3 in)
1946	91.4 mm (3.6 in)
1947	40.9 mm (1.6 in)
1948	36.1 mm (1.4 in)
1949	22.6 mm (0.9 in)
1950	32.8 mm (1.3 in)
1951	24.6 mm (1.0 in)
1952	38.1 mm (1.5 in)
1953	38.6 mm (1.5 in)
1954	41.9 mm (1.6 in)
1955	20.3 mm (0.8 in)
1956	64.3 mm (2.5 in)
1957	51.6 mm (2.0 in)
1958	38.4 mm (1.5 in)
1959	30.2 mm (1.2 in)
1960	111.0 mm (4.4 in)
1961	26.2 mm (1.0 in)
1962	36.8 mm (1.4 in)
1963	28.2 mm (1.1 in)
1964	33.8 mm (1.3 in)
1965	24.4 mm (1.0 in)
1966	53.3 mm (2.1 in)
1967	29.2 mm (1.1 in)
1968	29.5 mm (1.2 in)
1969	41.9 mm (1.6 in)
1970	93.5 mm (3.7 in)
1971	43.9 mm (1.7 in)
1972	47.0 mm (1.9 in)
1973	39.4 mm (1.6 in)
1974	48.0 mm (1.9 in)
1976	31.4 mm (1.2 in)
1977	39.6 mm (1.6 in)
1978	34.0 mm (1.3 in)
1979	26.6 mm (1.0 in)
1980	38.2 mm (1.5 in)
1981	28.0 mm (1.1 in)
1982	52.0 mm (2.0 in)
1983	38.0 mm (1.5 in)
1984	25.0 mm (1.0 in)
1985	21.2 mm (0.8 in)
1986	24.6 mm (1.0 in)
1987	38.0 mm (1.5 in)
1988	45.0 mm (1.8 in)
1989	29.0 mm (1.1 in)
1990	27.2 mm (1.1 in)
1991	51.6 mm (2.0 in)
1992	41.0 mm (1.6 in)
1993	24.2 mm (1.0 in)
1994	27.8 mm (1.1 in)
1995	50.0 mm (2.0 in)
1996	45.0 mm (1.8 in)
1997	43.4 mm (1.7 in)
1998	52.0 mm (2.0 in)
1999	34.0 mm (1.3 in)
2000	34.0 mm (1.3 in)
2001	36.0 mm (1.4 in)
2002	23.0 mm (0.9 in)
2003	32.6 mm (1.3 in)
2004	35.4 mm (1.4 in)
2005	40.2 mm (1.6 in)
2006	19.0 mm (0.7 in)
2007	48.4 mm (1.9 in)
2008	31.8 mm (1.3 in)
2009	46.2 mm (1.8 in)
2010	59.0 mm (2.3 in)
2011	27.4 mm (1.1 in)
2012	28.6 mm (1.1 in)
2013	33.2 mm (1.3 in)
2014	31.8 mm (1.3 in)
2015	39.4 mm (1.6 in)
2016	36.0 mm (1.4 in)
2017	47.2 mm (1.9 in)
2018	37.8 mm (1.5 in)
2019	25.0 mm (1.0 in)
2020	55.6 mm (2.2 in)
2021	43.4 mm (1.7 in)
2022	40.4 mm (1.6 in)
2023	27.2 mm (1.1 in)
2024	36.4 mm (1.4 in)
2025	21.8 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Osterley, 1910 to 2025. The record is 205.0 mm (8.1 in) in 1960, marked on the chart; the median year is 68.0 mm (2.7 in).

Wettest five days (Rx5day) at Osterley by year
Year	Wettest five days (Rx5day)
1910	77.3 mm (3.0 in)
1911	74.7 mm (2.9 in)
1912	58.2 mm (2.3 in)
1913	53.3 mm (2.1 in)
1914	46.1 mm (1.8 in)
1915	60.1 mm (2.4 in)
1916	74.9 mm (2.9 in)
1917	60.5 mm (2.4 in)
1918	59.5 mm (2.3 in)
1919	81.8 mm (3.2 in)
1920	66.3 mm (2.6 in)
1921	84.5 mm (3.3 in)
1922	72.7 mm (2.9 in)
1923	86.1 mm (3.4 in)
1924	58.0 mm (2.3 in)
1925	69.6 mm (2.7 in)
1926	55.1 mm (2.2 in)
1927	54.9 mm (2.2 in)
1928	68.6 mm (2.7 in)
1929	60.0 mm (2.4 in)
1930	61.0 mm (2.4 in)
1931	79.0 mm (3.1 in)
1932	62.5 mm (2.5 in)
1933	40.5 mm (1.6 in)
1934	78.4 mm (3.1 in)
1935	78.0 mm (3.1 in)
1936	84.9 mm (3.3 in)
1937	53.9 mm (2.1 in)
1938	92.2 mm (3.6 in)
1939	73.7 mm (2.9 in)
1940	45.5 mm (1.8 in)
1941	75.8 mm (3.0 in)
1942	81.1 mm (3.2 in)
1943	71.8 mm (2.8 in)
1944	88.4 mm (3.5 in)
1945	62.1 mm (2.4 in)
1946	91.4 mm (3.6 in)
1947	138.7 mm (5.5 in)
1948	92.5 mm (3.6 in)
1949	49.4 mm (1.9 in)
1950	70.2 mm (2.8 in)
1951	38.1 mm (1.5 in)
1952	108.5 mm (4.3 in)
1953	70.6 mm (2.8 in)
1954	95.0 mm (3.7 in)
1955	49.9 mm (2.0 in)
1956	103.0 mm (4.1 in)
1957	76.5 mm (3.0 in)
1958	96.2 mm (3.8 in)
1959	51.6 mm (2.0 in)
1960	205.0 mm (8.1 in)
1961	53.5 mm (2.1 in)
1962	67.9 mm (2.7 in)
1963	72.9 mm (2.9 in)
1964	60.1 mm (2.4 in)
1965	83.9 mm (3.3 in)
1966	77.2 mm (3.0 in)
1967	66.8 mm (2.6 in)
1968	64.2 mm (2.5 in)
1969	105.9 mm (4.2 in)
1970	109.7 mm (4.3 in)
1971	93.6 mm (3.7 in)
1972	65.2 mm (2.6 in)
1973	71.9 mm (2.8 in)
1974	67.8 mm (2.7 in)
1976	63.8 mm (2.5 in)
1977	91.2 mm (3.6 in)
1978	64.2 mm (2.5 in)
1979	38.4 mm (1.5 in)
1980	72.2 mm (2.8 in)
1981	55.8 mm (2.2 in)
1982	71.4 mm (2.8 in)
1983	51.4 mm (2.0 in)
1984	40.2 mm (1.6 in)
1985	25.2 mm (1.0 in)
1986	46.6 mm (1.8 in)
1987	67.0 mm (2.6 in)
1988	82.2 mm (3.2 in)
1989	42.6 mm (1.7 in)
1990	72.0 mm (2.8 in)
1991	97.4 mm (3.8 in)
1992	48.0 mm (1.9 in)
1993	39.8 mm (1.6 in)
1994	87.0 mm (3.4 in)
1995	68.0 mm (2.7 in)
1996	61.8 mm (2.4 in)
1997	53.0 mm (2.1 in)
1998	56.0 mm (2.2 in)
1999	49.2 mm (1.9 in)
2000	81.8 mm (3.2 in)
2001	94.0 mm (3.7 in)
2002	69.2 mm (2.7 in)
2003	69.8 mm (2.7 in)
2004	81.0 mm (3.2 in)
2005	54.0 mm (2.1 in)
2006	35.6 mm (1.4 in)
2007	89.4 mm (3.5 in)
2008	50.0 mm (2.0 in)
2009	71.2 mm (2.8 in)
2010	69.4 mm (2.7 in)
2011	62.0 mm (2.4 in)
2012	47.6 mm (1.9 in)
2013	61.6 mm (2.4 in)
2014	85.4 mm (3.4 in)
2015	67.0 mm (2.6 in)
2016	72.6 mm (2.9 in)
2017	86.4 mm (3.4 in)
2018	56.6 mm (2.2 in)
2019	66.4 mm (2.6 in)
2020	82.2 mm (3.2 in)
2021	65.0 mm (2.6 in)
2022	50.4 mm (2.0 in)
2023	36.2 mm (1.4 in)
2024	100.6 mm (4.0 in)
2025	29.4 mm (1.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Osterley, 1910 to 2025. The record is 43 days in 2022, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Osterley by year
Year	Longest dry spell (CDD)
1910	21 days
1911	31 days
1912	25 days
1913	23 days
1914	28 days
1915	19 days
1916	15 days
1917	28 days
1918	22 days
1919	21 days
1920	21 days
1921	21 days
1922	12 days
1923	37 days
1924	16 days
1925	18 days
1926	13 days
1927	13 days
1928	16 days
1929	14 days
1930	16 days
1931	18 days
1932	22 days
1933	14 days
1934	20 days
1935	21 days
1936	13 days
1937	23 days
1938	17 days
1939	19 days
1940	16 days
1941	16 days
1942	18 days
1943	25 days
1944	35 days
1945	35 days
1946	14 days
1947	16 days
1948	17 days
1949	15 days
1950	15 days
1951	14 days
1952	17 days
1953	23 days
1954	26 days
1955	17 days
1956	12 days
1957	13 days
1958	18 days
1959	35 days
1960	15 days
1961	28 days
1962	23 days
1963	33 days
1964	13 days
1965	22 days
1966	22 days
1967	32 days
1968	17 days
1969	13 days
1970	23 days
1971	10 days
1972	25 days
1973	12 days
1974	32 days
1976	16 days
1977	15 days
1978	19 days
1979	18 days
1980	25 days
1981	21 days
1982	23 days
1983	15 days
1984	11 days
1985	15 days
1986	10 days
1987	11 days
1988	24 days
1989	22 days
1990	16 days
1991	18 days
1992	13 days
1993	11 days
1994	18 days
1995	19 days
1996	11 days
1997	27 days
1998	16 days
1999	16 days
2000	20 days
2001	20 days
2002	26 days
2003	38 days
2004	15 days
2005	19 days
2006	23 days
2007	18 days
2008	16 days
2009	12 days
2010	17 days
2011	11 days
2012	15 days
2013	20 days
2014	27 days
2015	14 days
2016	16 days
2017	20 days
2018	17 days
2019	22 days
2020	16 days
2021	12 days
2022	43 days
2023	15 days
2024	14 days
2025	14 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

96 years, 1911 to 2023

A day with at least 36.0 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 97.3 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Osterley: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	36.0 mm (1.4 in)
5 years	48.2 mm (1.9 in)
10 years	57.8 mm (2.3 in)
25 years	71.8 mm (2.8 in)
50 years	83.8 mm (3.3 in)
100 years	97.3 mm (3.8 in)	Longer than the 96 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, 96 years of values from 1911 to 2023.

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: 111.0 mm (4.4 in) in 1960; 93.5 mm (3.7 in) in 1970; 91.4 mm (3.6 in) in 1946.

Download the Data

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