Merredin Weather Records (ASN00010092)

Record envelope, standing records and threshold days for Merredin (ASN00010092), Australia, with 123 years of record.

Key Facts for Merredin

Merredin (ASN00010092) is a weather station in Australia at -31.48 latitude and 118.28 longitude, 315 m (1,033 ft) above sea level.
The station reports from 1904 to 2026, 123 years of record.
1,464 records set at Merredin still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Merredin set a daily record high minimum temperature of 16.6 C (61.9 F) on 7 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Australia, -31.48 latitude, 118.28 longitude.
Elevation: 315 m (1,033 ft).
Period of record: 1904 to 2026, 123 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

4 days at or beyond a record

The band shows the record high and record low for each calendar day at Merredin. The lines show the 2026 daily maximum and minimum. 4 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Merredin, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	46.0 C (114.8 F)	6.4 C (43.5 F)	41.5 C (106.7 F)	12.4 C (54.3 F)
Feb	46.2 C (115.2 F)	7.1 C (44.8 F)	45.6 C (114.1 F)	13.5 C (56.3 F)
Mar	42.3 C (108.1 F)	2.8 C (37.0 F)	40.3 C (104.5 F)	12.1 C (53.8 F)
Apr	38.5 C (101.3 F)	2.5 C (36.5 F)	n/a	n/a
May	33.4 C (92.1 F)	-1.4 C (29.5 F)	22.2 C (72.0 F)	9.7 C (49.5 F)
Jun	27.3 C (81.1 F)	-2.9 C (26.8 F)	18.7 C (65.7 F)	1.0 C (33.8 F)
Jul	25.1 C (77.2 F)	-3.4 C (25.9 F)	25.0 C (77.0 F)	2.0 C (35.6 F)
Aug	30.8 C (87.4 F)	-2.8 C (27.0 F)	24.3 C (75.7 F)	0.2 C (32.4 F)
Sep	34.6 C (94.3 F)	-1.8 C (28.8 F)	32.1 C (89.8 F)	4.6 C (40.3 F)
Oct	39.5 C (103.1 F)	-0.3 C (31.5 F)	31.3 C (88.3 F)	2.0 C (35.6 F)
Nov	43.5 C (110.3 F)	0.6 C (33.1 F)	n/a	n/a
Dec	44.5 C (112.1 F)	3.3 C (37.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Merredin still stand. 1968 holds the most, with 47.

Standing records at Merredin by the year they were set
Year set	Standing records
1966	26
1967	21
1968	47
1969	27
1970	21
1971	22
1972	25
1973	24
1974	24
1975	15
1976	31
1977	26
1978	18
1979	25
1980	24
1981	32
1982	19
1983	24
1984	14
1985	30
1986	17
1987	30
1988	21
1989	22
1990	36
1991	29
1992	29
1993	22
1994	26
1995	19
1996	16
1997	22
1998	28
1999	18
2000	16
2001	24
2002	26
2003	16
2004	15
2005	34
2006	26
2007	28
2008	19
2009	20
2010	32
2011	12
2012	28
2013	30
2014	26
2015	19
2016	25
2017	22
2018	16
2019	35
2020	26
2021	21
2022	16
2023	32
2024	26
2025	40
2026	4

All-Time Record Progression

3 new records

3 all-time records were set at Merredin between 27 February 1997 and 21 January 2025. Each dot is a new record.

When Merredin set new all-time records
Date	Kind	Detail
1997-02-27	Record high minimum temperature	Record high minimum temperature 29.4 C (84.9 F)
2013-01-08	Record high minimum temperature	Record high minimum temperature 29.7 C (85.5 F)
2025-01-21	Record high minimum temperature	Record high minimum temperature 30.0 C (86.0 F)

Wettest Day of Each Month

Mar: 82.6 mm (3.3 in)

The wettest day on record for each calendar month at Merredin. The most was 82.6 mm (3.3 in) on 19 March 1917.

Record daily precipitation for each month at Merredin
Month	Record daily precipitation (mm)	Date
Jan	65.5 mm (2.6 in)	2 January 1966
Feb	66.0 mm (2.6 in)	14 February 1951
Mar	82.6 mm (3.3 in)	19 March 1917
Apr	59.7 mm (2.4 in)	17 April 1919
May	49.3 mm (1.9 in)	18 May 1944
Jun	59.4 mm (2.3 in)	22 June 1972
Jul	44.7 mm (1.8 in)	21 July 1960
Aug	37.0 mm (1.5 in)	1 August 2015
Sep	44.7 mm (1.8 in)	21 September 1955
Oct	49.0 mm (1.9 in)	19 October 2014
Nov	37.6 mm (1.5 in)	1 November 2012
Dec	48.5 mm (1.9 in)	3 December 1940

Period of Record Coverage

1966 to 2026

61 years of record at Merredin, 1966 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1972, 2024, 2025, 2026.

Days with data per year at Merredin
Year	Days with data	Share of year	Complete
1966	360	99%	Yes
1967	363	99%	Yes
1968	343	94%	Yes
1969	357	98%	Yes
1970	355	97%	Yes
1971	358	98%	Yes
1972	327	89%	No
1973	365	100%	Yes
1974	365	100%	Yes
1975	362	99%	Yes
1976	363	99%	Yes
1977	364	100%	Yes
1978	343	94%	Yes
1979	361	99%	Yes
1980	358	98%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	364	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	362	99%	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	352	96%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	363	99%	Yes
2003	365	100%	Yes
2004	361	99%	Yes
2005	358	98%	Yes
2006	357	98%	Yes
2007	358	98%	Yes
2008	354	97%	Yes
2009	365	100%	Yes
2010	361	99%	Yes
2011	350	96%	Yes
2012	358	98%	Yes
2013	362	99%	Yes
2014	361	99%	Yes
2015	355	97%	Yes
2016	360	98%	Yes
2017	354	97%	Yes
2018	353	97%	Yes
2019	361	99%	Yes
2020	359	98%	Yes
2021	356	98%	Yes
2022	359	98%	Yes
2023	358	98%	Yes
2024	306	84%	No
2025	324	89%	No
2026	70	19%	No

Latest Records

Latest records at Merredin
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
7 October 2026	Merredin, AU	daily high min (Provisional)	16.6 C (61.9 F)	0.8 C (1.4 F)	40 years	20 of 100 (Routine)
18 September 2026	Merredin, AU	daily high min (Provisional)	16.3 C (61.3 F)	0.8 C (1.4 F)	12 years	11 of 100 (Routine)
17 September 2026	Merredin, AU	daily high max (Provisional)	32.1 C (89.8 F)	1.6 C (2.9 F)	13 years	13 of 100 (Routine)
17 September 2026	Merredin, AU	daily high min (Provisional)	17.4 C (63.3 F)	1.3 C (2.3 F)	7 years	11 of 100 (Routine)
16 September 2026	Merredin, AU	daily high min (Provisional)	13.4 C (56.1 F)	0.5 C (0.9 F)	20 years	13 of 100 (Routine)
4 August 2026	Merredin, AU	daily high min	13.0 C (55.4 F)	0.3 C (0.5 F)	28 years	14 of 100 (Routine)
17 July 2026	Merredin, AU	daily high min (Tie)	13.3 C (55.9 F)	tie	25 years	3 of 100 (Routine)
16 July 2026	Merredin, AU	daily high max	25.0 C (77.0 F)	2.4 C (4.3 F)	48 years	29 of 100 (Routine)
15 July 2026	Merredin, AU	daily high max	24.2 C (75.6 F)	2.4 C (4.3 F)	12 years	18 of 100 (Routine)
10 February 2026	Merredin, AU	daily rain	13.0 mm (0.5 in)	7.7 mm (0.30 in)	103 years	20 of 100 (Routine)
2 February 2026	Merredin, AU	daily high max	45.6 C (114.1 F)	0.6 C (1.1 F)	2 years	7 of 100 (Routine)
9 December 2025	Merredin, AU	daily low min	7.0 C (44.6 F)	0.9 C (1.6 F)	22 years	14 of 100 (Routine)
14 October 2025	Merredin, AU	daily high max	34.4 C (93.9 F)	0.4 C (0.7 F)	18 years	11 of 100 (Routine)
25 September 2025	Merredin, AU	daily high max	32.6 C (90.7 F)	1.3 C (2.3 F)	11 years	12 of 100 (Routine)
24 September 2025	Merredin, AU	daily high max	30.0 C (86.0 F)	1.0 C (1.8 F)	10 years	11 of 100 (Routine)
16 September 2025	Merredin, AU	daily low min (Tie)	0.0 C (32.0 F)	tie	23 years	3 of 100 (Routine)
25 August 2025	Merredin, AU	daily low max	11.0 C (51.8 F)	0.8 C (1.4 F)	38 years	19 of 100 (Routine)
20 August 2025	Merredin, AU	daily high min (Tie)	12.3 C (54.1 F)	tie	7 years	2 of 100 (Routine)
18 August 2025	Merredin, AU	daily high max	25.5 C (77.9 F)	2.2 C (4.0 F)	38 years	23 of 100 (Routine)
13 August 2025	Merredin, AU	daily high max	28.0 C (82.4 F)	4.6 C (8.3 F)	48 years	34 of 100 (Routine)

Climate Trend

54 complete years, 1966 to 2023

One stripe for each of 54 complete years at Merredin, 1966 to 2023. Blue stripes are years cooler than the station's own mean of 18.3 C (64.9 F); red stripes are warmer. The coolest year was 1968, at 16.5 C (61.8 F), and the warmest was 2019, at 19.6 C (67.3 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Merredin as warming stripes, 1966 to 2023
Year	Annual mean temperature	Difference from the station mean
1966	17.2 C	-1.05 C
1967	18.1 C	-0.20 C
1968	16.5 C	-1.75 C
1969	18.1 C	-0.19 C
1970	17.9 C	-0.44 C
1971	17.1 C	-1.20 C
1973	17.4 C	-0.86 C
1974	17.6 C	-0.69 C
1975	17.8 C	-0.47 C
1976	18.5 C	+0.24 C
1977	18.9 C	+0.59 C
1978	18.5 C	+0.17 C
1979	18.3 C	-0.03 C
1980	18.5 C	+0.17 C
1981	17.6 C	-0.73 C
1982	18.2 C	-0.08 C
1983	18.6 C	+0.26 C
1984	17.3 C	-0.98 C
1985	18.5 C	+0.17 C
1986	17.3 C	-0.98 C
1987	18.2 C	-0.10 C
1988	18.2 C	-0.06 C
1989	17.8 C	-0.48 C
1990	17.5 C	-0.76 C
1991	18.8 C	+0.50 C
1992	17.7 C	-0.58 C
1993	17.8 C	-0.47 C
1994	18.8 C	+0.46 C
1995	17.9 C	-0.37 C
1996	18.5 C	+0.16 C
1997	18.5 C	+0.18 C
1998	18.8 C	+0.49 C
2000	18.2 C	-0.13 C
2001	17.7 C	-0.64 C
2002	18.6 C	+0.29 C
2003	18.6 C	+0.31 C
2004	18.5 C	+0.16 C
2005	18.0 C	-0.29 C
2006	18.4 C	+0.10 C
2007	18.5 C	+0.21 C
2008	18.5 C	+0.21 C
2009	18.8 C	+0.47 C
2010	19.0 C	+0.69 C
2012	19.1 C	+0.81 C
2013	19.3 C	+1.01 C
2014	19.6 C	+1.30 C
2015	19.4 C	+1.14 C
2016	17.9 C	-0.44 C
2018	18.6 C	+0.30 C
2019	19.6 C	+1.31 C
2020	19.2 C	+0.88 C
2021	18.6 C	+0.28 C
2022	18.5 C	+0.19 C
2023	19.1 C	+0.85 C

The annual mean temperature here has risen by 0.3 C (0.2 to 0.3) per decade over 1966 to 2023. In Fahrenheit: 0.5 F (0.3 to 0.6) per decade. The slope is a straight line fitted to 54 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Merredin
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.2 to 0.3) per decade	0.5 F (0.3 to 0.6) per decade	1966 to 2023	54	Rise
Mean daily maximum	0.3 C (0.2 to 0.4) per decade	0.6 F (0.4 to 0.8) per decade	1966 to 2023	54	Rise
Mean daily minimum	0.2 C (0.1 to 0.2) per decade	0.3 F (0.1 to 0.4) per decade	1966 to 2023	54	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

1904 to 2026

Yearly extremes at Merredin: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.2 C (115.2 F)	1991	43.1 C (109.6 F)	61
Coldest night (TNn)	-3.4 C (25.9 F)	1990	-1.2 C (29.8 F)	61
Wettest day (Rx1day)	82.6 mm (3.3 in)	1917	32.8 mm (1.3 in)	123
Wettest five days (Rx5day)	114.9 mm (4.5 in)	1917	46.2 mm (1.8 in)	123
Longest dry spell (CDD)	101 days	1996	47 days	123

Hottest day (TXx)

The hottest day of the year at Merredin, 1904 to 2026. The record is 46.2 C (115.2 F) in 1991, marked on the chart; the median year is 43.1 C (109.6 F).

Hottest day (TXx) at Merredin by year
Year	Hottest day (TXx)
1904	n/a
1905	n/a
1906	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	40.0 C (104.0 F)
1967	42.2 C (108.0 F)
1968	42.8 C (109.0 F)
1969	43.3 C (109.9 F)
1970	42.4 C (108.3 F)
1971	42.3 C (108.1 F)
1972	42.6 C (108.7 F)
1973	40.8 C (105.4 F)
1974	41.6 C (106.9 F)
1975	44.5 C (112.1 F)
1976	43.6 C (110.5 F)
1977	44.0 C (111.2 F)
1978	42.3 C (108.1 F)
1979	45.0 C (113.0 F)
1980	46.0 C (114.8 F)
1981	43.1 C (109.6 F)
1982	42.9 C (109.2 F)
1983	43.2 C (109.8 F)
1984	41.0 C (105.8 F)
1985	44.5 C (112.1 F)
1986	40.9 C (105.6 F)
1987	41.8 C (107.2 F)
1988	43.0 C (109.4 F)
1989	42.0 C (107.6 F)
1990	42.5 C (108.5 F)
1991	46.2 C (115.2 F)
1992	41.9 C (107.4 F)
1993	44.3 C (111.7 F)
1994	44.3 C (111.7 F)
1995	42.8 C (109.0 F)
1996	42.7 C (108.9 F)
1997	44.2 C (111.6 F)
1998	43.9 C (111.0 F)
1999	41.0 C (105.8 F)
2000	41.0 C (105.8 F)
2001	42.8 C (109.0 F)
2002	41.1 C (106.0 F)
2003	42.0 C (107.6 F)
2004	44.0 C (111.2 F)
2005	42.4 C (108.3 F)
2006	41.9 C (107.4 F)
2007	46.0 C (114.8 F)
2008	44.7 C (112.5 F)
2009	44.5 C (112.1 F)
2010	45.2 C (113.4 F)
2011	43.4 C (110.1 F)
2012	42.1 C (107.8 F)
2013	43.9 C (111.0 F)
2014	45.6 C (114.1 F)
2015	45.5 C (113.9 F)
2016	44.1 C (111.4 F)
2017	43.5 C (110.3 F)
2018	42.8 C (109.0 F)
2019	44.2 C (111.6 F)
2020	45.4 C (113.7 F)
2021	41.1 C (106.0 F)
2022	44.0 C (111.2 F)
2023	43.0 C (109.4 F)
2024	45.7 C (114.3 F)
2025	45.0 C (113.0 F)
2026	45.6 C (114.1 F)

Coldest night (TNn)

The coldest night of the year at Merredin, 1904 to 2026. The record is -3.4 C (25.9 F) in 1990, marked on the chart; the median year is -1.2 C (29.8 F).

Coldest night (TNn) at Merredin by year
Year	Coldest night (TNn)
1904	n/a
1905	n/a
1906	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	-1.3 C (29.7 F)
1967	-1.3 C (29.7 F)
1968	-1.7 C (28.9 F)
1969	-2.8 C (27.0 F)
1970	-1.8 C (28.8 F)
1971	-1.1 C (30.0 F)
1972	-0.7 C (30.7 F)
1973	-2.1 C (28.2 F)
1974	-1.2 C (29.8 F)
1975	-1.0 C (30.2 F)
1976	-2.0 C (28.4 F)
1977	-0.3 C (31.5 F)
1978	-1.2 C (29.8 F)
1979	-1.7 C (28.9 F)
1980	-1.0 C (30.2 F)
1981	-2.9 C (26.8 F)
1982	-2.3 C (27.9 F)
1983	-2.0 C (28.4 F)
1984	-0.5 C (31.1 F)
1985	0.1 C (32.2 F)
1986	-2.5 C (27.5 F)
1987	-0.6 C (30.9 F)
1988	-0.1 C (31.8 F)
1989	-2.3 C (27.9 F)
1990	-3.4 C (25.9 F)
1991	-1.5 C (29.3 F)
1992	-0.8 C (30.6 F)
1993	-1.6 C (29.1 F)
1994	-1.3 C (29.7 F)
1995	-0.5 C (31.1 F)
1996	-1.4 C (29.5 F)
1997	-2.1 C (28.2 F)
1998	-1.0 C (30.2 F)
1999	-1.3 C (29.7 F)
2000	-1.6 C (29.1 F)
2001	-2.0 C (28.4 F)
2002	-1.0 C (30.2 F)
2003	-1.5 C (29.3 F)
2004	-0.7 C (30.7 F)
2005	-2.2 C (28.0 F)
2006	-1.9 C (28.6 F)
2007	-1.5 C (29.3 F)
2008	-1.0 C (30.2 F)
2009	-1.6 C (29.1 F)
2010	-2.5 C (27.5 F)
2011	-0.4 C (31.3 F)
2012	-2.5 C (27.5 F)
2013	0.0 C (32.0 F)
2014	-1.0 C (30.2 F)
2015	-1.0 C (30.2 F)
2016	-1.6 C (29.1 F)
2017	-1.0 C (30.2 F)
2018	-1.0 C (30.2 F)
2019	-0.5 C (31.1 F)
2020	0.5 C (32.9 F)
2021	-1.0 C (30.2 F)
2022	-0.1 C (31.8 F)
2023	-1.0 C (30.2 F)
2024	0.6 C (33.1 F)
2025	-1.0 C (30.2 F)
2026	0.2 C (32.4 F)

Wettest day (Rx1day)

The wettest day of the year at Merredin, 1904 to 2026. The record is 82.6 mm (3.3 in) in 1917, marked on the chart; the median year is 32.8 mm (1.3 in).

Wettest day (Rx1day) at Merredin by year
Year	Wettest day (Rx1day)
1904	0.0 mm (0.00 in)
1905	0.0 mm (0.00 in)
1906	0.0 mm (0.00 in)
1907	39.4 mm (1.6 in)
1908	35.3 mm (1.4 in)
1909	40.6 mm (1.6 in)
1910	33.0 mm (1.3 in)
1911	10.4 mm (0.4 in)
1912	19.3 mm (0.8 in)
1913	23.4 mm (0.9 in)
1914	13.7 mm (0.5 in)
1915	24.1 mm (0.9 in)
1916	30.0 mm (1.2 in)
1917	82.6 mm (3.3 in)
1918	46.2 mm (1.8 in)
1919	59.7 mm (2.4 in)
1920	38.1 mm (1.5 in)
1921	29.2 mm (1.1 in)
1922	41.4 mm (1.6 in)
1923	38.9 mm (1.5 in)
1924	21.1 mm (0.8 in)
1925	24.6 mm (1.0 in)
1926	17.8 mm (0.7 in)
1927	37.6 mm (1.5 in)
1928	19.1 mm (0.8 in)
1929	44.5 mm (1.8 in)
1930	22.9 mm (0.9 in)
1931	33.5 mm (1.3 in)
1932	32.5 mm (1.3 in)
1933	26.4 mm (1.0 in)
1934	52.6 mm (2.1 in)
1935	21.1 mm (0.8 in)
1936	29.7 mm (1.2 in)
1937	37.8 mm (1.5 in)
1938	22.6 mm (0.9 in)
1939	55.6 mm (2.2 in)
1940	48.5 mm (1.9 in)
1941	19.1 mm (0.8 in)
1942	36.6 mm (1.4 in)
1943	33.8 mm (1.3 in)
1944	49.3 mm (1.9 in)
1945	24.6 mm (1.0 in)
1946	27.9 mm (1.1 in)
1947	26.7 mm (1.1 in)
1948	32.3 mm (1.3 in)
1949	20.8 mm (0.8 in)
1950	24.4 mm (1.0 in)
1951	66.0 mm (2.6 in)
1952	32.8 mm (1.3 in)
1953	77.7 mm (3.1 in)
1954	41.7 mm (1.6 in)
1955	44.7 mm (1.8 in)
1956	24.9 mm (1.0 in)
1957	17.5 mm (0.7 in)
1958	26.7 mm (1.1 in)
1959	23.4 mm (0.9 in)
1960	44.7 mm (1.8 in)
1961	39.9 mm (1.6 in)
1962	20.1 mm (0.8 in)
1963	33.8 mm (1.3 in)
1964	14.5 mm (0.6 in)
1965	48.5 mm (1.9 in)
1966	65.5 mm (2.6 in)
1967	24.9 mm (1.0 in)
1968	46.5 mm (1.8 in)
1969	25.7 mm (1.0 in)
1970	51.1 mm (2.0 in)
1971	76.7 mm (3.0 in)
1972	59.4 mm (2.3 in)
1973	29.2 mm (1.1 in)
1974	51.2 mm (2.0 in)
1975	36.6 mm (1.4 in)
1976	19.0 mm (0.7 in)
1977	19.9 mm (0.8 in)
1978	60.0 mm (2.4 in)
1979	48.3 mm (1.9 in)
1980	16.0 mm (0.6 in)
1981	35.0 mm (1.4 in)
1982	19.0 mm (0.7 in)
1983	35.2 mm (1.4 in)
1984	25.0 mm (1.0 in)
1985	22.4 mm (0.9 in)
1986	27.0 mm (1.1 in)
1987	28.8 mm (1.1 in)
1988	29.6 mm (1.2 in)
1989	52.0 mm (2.0 in)
1990	52.0 mm (2.0 in)
1991	43.4 mm (1.7 in)
1992	44.2 mm (1.7 in)
1993	48.6 mm (1.9 in)
1994	17.0 mm (0.7 in)
1995	29.8 mm (1.2 in)
1996	26.4 mm (1.0 in)
1997	24.4 mm (1.0 in)
1998	46.0 mm (1.8 in)
1999	45.2 mm (1.8 in)
2000	50.2 mm (2.0 in)
2001	43.8 mm (1.7 in)
2002	44.4 mm (1.7 in)
2003	28.0 mm (1.1 in)
2004	32.8 mm (1.3 in)
2005	22.4 mm (0.9 in)
2006	64.4 mm (2.5 in)
2007	22.2 mm (0.9 in)
2008	23.4 mm (0.9 in)
2009	23.6 mm (0.9 in)
2010	34.8 mm (1.4 in)
2011	58.4 mm (2.3 in)
2012	37.6 mm (1.5 in)
2013	30.4 mm (1.2 in)
2014	49.0 mm (1.9 in)
2015	45.2 mm (1.8 in)
2016	40.6 mm (1.6 in)
2017	24.0 mm (0.9 in)
2018	24.8 mm (1.0 in)
2019	23.0 mm (0.9 in)
2020	37.0 mm (1.5 in)
2021	35.6 mm (1.4 in)
2022	33.2 mm (1.3 in)
2023	23.6 mm (0.9 in)
2024	20.0 mm (0.8 in)
2025	22.0 mm (0.9 in)
2026	33.0 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Merredin, 1904 to 2026. The record is 114.9 mm (4.5 in) in 1917, marked on the chart; the median year is 46.2 mm (1.8 in).

Wettest five days (Rx5day) at Merredin by year
Year	Wettest five days (Rx5day)
1904	0.0 mm (0.00 in)
1905	0.0 mm (0.00 in)
1906	0.0 mm (0.00 in)
1907	50.4 mm (2.0 in)
1908	35.3 mm (1.4 in)
1909	45.4 mm (1.8 in)
1910	58.1 mm (2.3 in)
1911	20.1 mm (0.8 in)
1912	30.6 mm (1.2 in)
1913	33.1 mm (1.3 in)
1914	18.0 mm (0.7 in)
1915	42.6 mm (1.7 in)
1916	31.3 mm (1.2 in)
1917	114.9 mm (4.5 in)
1918	50.1 mm (2.0 in)
1919	103.9 mm (4.1 in)
1920	54.3 mm (2.1 in)
1921	54.3 mm (2.1 in)
1922	58.7 mm (2.3 in)
1923	53.6 mm (2.1 in)
1924	29.8 mm (1.2 in)
1925	32.7 mm (1.3 in)
1926	33.7 mm (1.3 in)
1927	98.6 mm (3.9 in)
1928	23.7 mm (0.9 in)
1929	48.3 mm (1.9 in)
1930	63.3 mm (2.5 in)
1931	38.4 mm (1.5 in)
1932	46.2 mm (1.8 in)
1933	42.6 mm (1.7 in)
1934	82.5 mm (3.2 in)
1935	32.0 mm (1.3 in)
1936	31.2 mm (1.2 in)
1937	51.2 mm (2.0 in)
1938	30.6 mm (1.2 in)
1939	69.1 mm (2.7 in)
1940	53.6 mm (2.1 in)
1941	47.1 mm (1.9 in)
1942	46.8 mm (1.8 in)
1943	78.5 mm (3.1 in)
1944	53.6 mm (2.1 in)
1945	48.8 mm (1.9 in)
1946	49.3 mm (1.9 in)
1947	31.1 mm (1.2 in)
1948	33.6 mm (1.3 in)
1949	26.7 mm (1.1 in)
1950	35.1 mm (1.4 in)
1951	67.3 mm (2.6 in)
1952	35.6 mm (1.4 in)
1953	93.0 mm (3.7 in)
1954	60.8 mm (2.4 in)
1955	45.2 mm (1.8 in)
1956	45.4 mm (1.8 in)
1957	29.4 mm (1.2 in)
1958	35.8 mm (1.4 in)
1959	44.5 mm (1.8 in)
1960	68.6 mm (2.7 in)
1961	49.0 mm (1.9 in)
1962	32.7 mm (1.3 in)
1963	51.8 mm (2.0 in)
1964	24.1 mm (0.9 in)
1965	63.3 mm (2.5 in)
1966	76.9 mm (3.0 in)
1967	24.9 mm (1.0 in)
1968	67.6 mm (2.7 in)
1969	32.9 mm (1.3 in)
1970	70.9 mm (2.8 in)
1971	107.4 mm (4.2 in)
1972	77.2 mm (3.0 in)
1973	46.2 mm (1.8 in)
1974	70.9 mm (2.8 in)
1975	41.0 mm (1.6 in)
1976	26.7 mm (1.1 in)
1977	31.8 mm (1.3 in)
1978	96.8 mm (3.8 in)
1979	56.9 mm (2.2 in)
1980	27.6 mm (1.1 in)
1981	45.6 mm (1.8 in)
1982	27.0 mm (1.1 in)
1983	60.2 mm (2.4 in)
1984	40.2 mm (1.6 in)
1985	35.0 mm (1.4 in)
1986	39.8 mm (1.6 in)
1987	52.4 mm (2.1 in)
1988	46.0 mm (1.8 in)
1989	59.6 mm (2.3 in)
1990	72.2 mm (2.8 in)
1991	62.6 mm (2.5 in)
1992	53.0 mm (2.1 in)
1993	50.0 mm (2.0 in)
1994	31.8 mm (1.3 in)
1995	44.4 mm (1.7 in)
1996	30.6 mm (1.2 in)
1997	39.6 mm (1.6 in)
1998	50.0 mm (2.0 in)
1999	80.0 mm (3.1 in)
2000	58.8 mm (2.3 in)
2001	99.0 mm (3.9 in)
2002	60.4 mm (2.4 in)
2003	42.4 mm (1.7 in)
2004	35.6 mm (1.4 in)
2005	46.4 mm (1.8 in)
2006	66.0 mm (2.6 in)
2007	39.2 mm (1.5 in)
2008	44.6 mm (1.8 in)
2009	29.8 mm (1.2 in)
2010	48.6 mm (1.9 in)
2011	58.6 mm (2.3 in)
2012	49.8 mm (2.0 in)
2013	56.4 mm (2.2 in)
2014	51.4 mm (2.0 in)
2015	86.2 mm (3.4 in)
2016	64.8 mm (2.6 in)
2017	52.8 mm (2.1 in)
2018	33.6 mm (1.3 in)
2019	34.2 mm (1.3 in)
2020	38.2 mm (1.5 in)
2021	61.0 mm (2.4 in)
2022	36.8 mm (1.4 in)
2023	26.6 mm (1.0 in)
2024	28.4 mm (1.1 in)
2025	32.2 mm (1.3 in)
2026	33.0 mm (1.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Merredin, 1904 to 2026. The record is 101 days in 1996, marked on the chart; the median year is 47 days.

Longest dry spell (CDD) at Merredin by year
Year	Longest dry spell (CDD)
1904	60 days
1905	31 days
1906	31 days
1907	54 days
1908	31 days
1909	50 days
1910	60 days
1911	74 days
1912	39 days
1913	75 days
1914	76 days
1915	72 days
1916	36 days
1917	59 days
1918	27 days
1919	71 days
1920	37 days
1921	39 days
1922	54 days
1923	69 days
1924	51 days
1925	43 days
1926	37 days
1927	38 days
1928	46 days
1929	46 days
1930	62 days
1931	53 days
1932	55 days
1933	48 days
1934	36 days
1935	41 days
1936	43 days
1937	49 days
1938	56 days
1939	49 days
1940	75 days
1941	56 days
1942	36 days
1943	29 days
1944	54 days
1945	83 days
1946	43 days
1947	44 days
1948	42 days
1949	43 days
1950	98 days
1951	41 days
1952	23 days
1953	41 days
1954	91 days
1955	40 days
1956	64 days
1957	89 days
1958	56 days
1959	28 days
1960	46 days
1961	57 days
1962	47 days
1963	27 days
1964	36 days
1965	61 days
1966	55 days
1967	61 days
1968	43 days
1969	50 days
1970	44 days
1971	27 days
1972	54 days
1973	49 days
1974	39 days
1975	58 days
1976	47 days
1977	48 days
1978	41 days
1979	42 days
1980	53 days
1981	42 days
1982	40 days
1983	40 days
1984	34 days
1985	31 days
1986	44 days
1987	76 days
1988	83 days
1989	70 days
1990	34 days
1991	63 days
1992	35 days
1993	42 days
1994	61 days
1995	56 days
1996	101 days
1997	40 days
1998	61 days
1999	26 days
2000	69 days
2001	57 days
2002	74 days
2003	47 days
2004	37 days
2005	57 days
2006	43 days
2007	52 days
2008	30 days
2009	42 days
2010	52 days
2011	48 days
2012	34 days
2013	40 days
2014	37 days
2015	55 days
2016	39 days
2017	28 days
2018	54 days
2019	76 days
2020	42 days
2021	39 days
2022	43 days
2023	56 days
2024	52 days
2025	27 days
2026	40 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

47 years with a frost

Across 47 years with a frost, the median last spring frost at Merredin falls on 2 September and the median first autumn frost on 4 July, which leaves a median of 311 days between them.

Fitted over all years, the growing season changes by -4.2 days per decade at this station.

Frost dates and growing season at Merredin
Measure	Median, all years	Earliest period	Recent period (1987 to 2022)	Recent against earliest	Fitted trend
Last spring frost	2 September	n/a	2 September	n/a	-0.6 days per decade
First autumn frost	4 July	n/a	30 June	n/a	-4.8 days per decade
Growing days	311 days	n/a	305 days	n/a	-4.2 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

116 years, 1907 to 2025

A day with at least 32.8 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 83.7 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Merredin: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	32.8 mm (1.3 in)
5 years	45.7 mm (1.8 in)
10 years	54.6 mm (2.1 in)
25 years	66.0 mm (2.6 in)
50 years	74.8 mm (2.9 in)
100 years	83.7 mm (3.3 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 116 years of values from 1907 to 2025.

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: 82.6 mm (3.3 in) in 1917; 77.7 mm (3.1 in) in 1953; 76.7 mm (3.0 in) in 1971.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Merredin, at 2008. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 2008 ran 0.2 C (0.4 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Merredin, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
2008	+0.2	+0.4	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.

Climate Twins

2007 to 2023 against 1961 to 1990

Over 2007 to 2023, Merredin had a mean temperature of 18.9 C (66.0 F) and 296.6 mm (11.7 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Dalwallinu Comparison (Australia, 204 km away), Woomera Aerodrome (Australia, 1,758 km away) and Kalgoorlie-Boulder Airport (Australia, 312 km away).

Climate twins of Merredin: stations whose 1961 to 1990 climate is closest to its 2007 to 2023 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Dalwallinu Comparison	Australia	204 km (127 mi)	19.0 C (66.2 F)	364.0 mm (14.3 in)	0.61
Woomera Aerodrome	Australia	1,758 km (1,092 mi)	19.1 C (66.4 F)	197.2 mm (7.8 in)	0.68
Kalgoorlie-Boulder Airport	Australia	312 km (194 mi)	18.5 C (65.2 F)	270.6 mm (10.7 in)	0.68

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

Data for Merredin standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Merredin 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).