Merredin Research Station Weather Records (ASN00010093)

Record envelope, standing records and threshold days for Merredin Research Station (ASN00010093), Australia, with 102 years of record.

Key Facts for Merredin Research Station

Merredin Research Station (ASN00010093) is a weather station in Australia at -31.50 latitude and 118.22 longitude, 318 m (1,043 ft) above sea level.
The station reports from 1912 to 2013, 102 years of record.
1,464 records set at Merredin Research Station still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Merredin Research Station set a daily record precipitation of 16.0 mm (0.6 in) on 14 March 2013.

About the Station

Location: Australia, -31.50 latitude, 118.22 longitude.
Elevation: 318 m (1,043 ft).
Period of record: 1912 to 2013, 102 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 Merredin Research Station. 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 Merredin Research Station, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	45.7 C (114.3 F)	7.2 C (45.0 F)	n/a	n/a
Feb	44.4 C (111.9 F)	6.1 C (43.0 F)	n/a	n/a
Mar	43.1 C (109.6 F)	5.1 C (41.2 F)	n/a	n/a
Apr	38.8 C (101.8 F)	-1.2 C (29.8 F)	n/a	n/a
May	34.2 C (93.6 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	27.4 C (81.3 F)	-2.8 C (27.0 F)	n/a	n/a
Jul	25.6 C (78.1 F)	-3.7 C (25.3 F)	n/a	n/a
Aug	29.7 C (85.5 F)	-3.4 C (25.9 F)	n/a	n/a
Sep	33.8 C (92.8 F)	-2.5 C (27.5 F)	n/a	n/a
Oct	39.2 C (102.6 F)	-1.2 C (29.8 F)	n/a	n/a
Nov	41.7 C (107.1 F)	0.6 C (33.1 F)	n/a	n/a
Dec	44.5 C (112.1 F)	2.3 C (36.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Merredin Research Station still stand. 1914 holds the most, with 61.

Standing records at Merredin Research Station by the year they were set
Year set	Standing records
1912	3
1913	44
1914	61
1915	17
1916	35
1917	35
1918	19
1919	28
1920	22
1921	20
1922	20
1923	10
1924	18
1925	28
1926	23
1927	20
1928	22
1929	21
1930	17
1931	25
1932	17
1933	22
1934	20
1935	23
1936	18
1937	13
1938	19
1939	9
1940	29
1941	15
1942	10
1943	12
1944	28
1945	18
1946	16
1947	24
1948	16
1949	15
1950	17
1951	16
1952	19
1953	18
1954	21
1955	12
1956	17
1957	22
1958	11
1959	26
1960	24
1961	23
1962	20
1963	14
1964	32
1965	12
1966	8
1967	14
1968	25
1969	21
1970	15
1971	18
1972	24
1973	12
1974	13
1975	14
1976	20
1977	30
1978	19
1979	18
1980	15
1981	24
1982	15
1983	23
1984	12
1985	8

All-Time Record Progression

7 new records

7 all-time records were set at Merredin Research Station between 1 August 1945 and 23 January 1980. Each dot is a new record.

When Merredin Research Station set new all-time records
Date	Kind	Detail
1945-08-01	Record low maximum temperature	Record low maximum temperature 8.2 C (46.8 F)
1953-03-25	Record daily precipitation	Record daily precipitation 84.6 mm (3.3 in)
1961-01-20	Record high minimum temperature	Record high minimum temperature 28.6 C (83.5 F)
1971-03-28	Record daily precipitation	Record daily precipitation 84.8 mm (3.3 in)
1977-01-05	Record high minimum temperature	Record high minimum temperature 29.8 C (85.6 F)
1979-08-19	Record low maximum temperature	Record low maximum temperature 7.8 C (46.0 F)
1980-01-23	Record high maximum temperature	Record high maximum temperature 45.7 C (114.3 F)

Wettest Day of Each Month

Mar: 84.8 mm (3.3 in)

The wettest day on record for each calendar month at Merredin Research Station. The most was 84.8 mm (3.3 in) on 28 March 1971.

Record daily precipitation for each month at Merredin Research Station
Month	Record daily precipitation (mm)	Date
Jan	54.8 mm (2.2 in)	29 January 1990
Feb	77.0 mm (3.0 in)	14 February 1939
Mar	84.8 mm (3.3 in)	28 March 1971
Apr	68.8 mm (2.7 in)	4 April 1974
May	49.8 mm (2.0 in)	5 May 1965
Jun	48.5 mm (1.9 in)	25 June 1965
Jul	38.1 mm (1.5 in)	21 July 1960
Aug	33.5 mm (1.3 in)	11 August 1931
Sep	41.1 mm (1.6 in)	21 September 1955
Oct	32.0 mm (1.3 in)	18 October 1995
Nov	42.9 mm (1.7 in)	16 November 1951
Dec	60.0 mm (2.4 in)	24 December 1995

Period of Record Coverage

1912 to 1985

74 years of record at Merredin Research Station, 1912 to 1985. 6 years have data for under 90 percent of days and are left out of rankings: 1912, 1925, 1967, 1969, 1971, 1985.

Days with data per year at Merredin Research Station
Year	Days with data	Share of year	Complete
1912	31	8%	No
1913	349	96%	Yes
1914	364	100%	Yes
1915	365	100%	Yes
1916	366	100%	Yes
1917	361	99%	Yes
1918	359	98%	Yes
1919	365	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	338	93%	Yes
1924	366	100%	Yes
1925	254	70%	No
1926	363	99%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	361	99%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	364	99%	Yes
1933	360	99%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	361	99%	Yes
1944	365	100%	Yes
1945	364	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	361	99%	Yes
1950	363	99%	Yes
1951	365	100%	Yes
1952	362	99%	Yes
1953	363	99%	Yes
1954	365	100%	Yes
1955	346	95%	Yes
1956	365	100%	Yes
1957	363	99%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	365	100%	Yes
1961	365	100%	Yes
1962	353	97%	Yes
1963	355	97%	Yes
1964	358	98%	Yes
1965	357	98%	Yes
1966	345	95%	Yes
1967	283	78%	No
1968	330	90%	Yes
1969	320	88%	No
1970	365	100%	Yes
1971	321	88%	No
1972	348	95%	Yes
1973	361	99%	Yes
1974	363	99%	Yes
1975	358	98%	Yes
1976	361	99%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	360	99%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	353	97%	Yes
1983	361	99%	Yes
1984	344	94%	Yes
1985	86	24%	No

Latest Records

Latest records at Merredin Research Station
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
14 March 2013	Merredin Research Station, AU	daily rain	16.0 mm (0.6 in)	7.6 mm (0.30 in)	51 years	20 of 100 (Routine)
13 January 2013	Merredin Research Station, AU	daily rain	36.0 mm (1.4 in)	9.2 mm (0.36 in)	18 years	24 of 100 (Routine)
28 August 2004	Merredin Research Station, AU	daily rain	11.6 mm (0.5 in)	0.2 mm (0.01 in)	63 years	20 of 100 (Routine)
27 August 2004	Merredin Research Station, AU	daily rain	9.8 mm (0.39 in)	0.6 mm (0.02 in)	19 years	15 of 100 (Routine)
7 July 2004	Merredin Research Station, AU	daily rain	17.0 mm (0.7 in)	1.0 mm (0.04 in)	31 years	20 of 100 (Routine)
8 April 2004	Merredin Research Station, AU	daily rain	23.0 mm (0.9 in)	16.4 mm (0.6 in)	61 years	20 of 100 (Routine)
6 January 2004	Merredin Research Station, AU	daily rain	14.6 mm (0.6 in)	7.0 mm (0.28 in)	68 years	20 of 100 (Routine)
5 January 2004	Merredin Research Station, AU	daily rain	7.8 mm (0.31 in)	1.4 mm (0.06 in)	88 years	20 of 100 (Routine)
30 September 2003	Merredin Research Station, AU	daily rain	15.0 mm (0.6 in)	6.6 mm (0.26 in)	44 years	20 of 100 (Routine)
22 August 2003	Merredin Research Station, AU	daily rain	12.4 mm (0.5 in)	1.2 mm (0.05 in)	78 years	20 of 100 (Routine)
17 August 2003	Merredin Research Station, AU	daily rain	7.0 mm (0.28 in)	0.6 mm (0.02 in)	30 years	19 of 100 (Routine)
3 August 2003	Merredin Research Station, AU	daily rain	11.2 mm (0.4 in)	0.5 mm (0.02 in)	84 years	20 of 100 (Routine)
16 May 2003	Merredin Research Station, AU	daily rain	28.8 mm (1.1 in)	1.1 mm (0.04 in)	60 years	28 of 100 (Routine)
12 May 2003	Merredin Research Station, AU	daily rain	10.2 mm (0.4 in)	4.2 mm (0.17 in)	4 years	16 of 100 (Routine)
13 April 2003	Merredin Research Station, AU	daily rain	10.6 mm (0.4 in)	3.0 mm (0.12 in)	72 years	20 of 100 (Routine)
18 February 2003	Merredin Research Station, AU	daily rain	27.0 mm (1.1 in)	14.8 mm (0.6 in)	36 years	34 of 100 (Routine)
6 December 2002	Merredin Research Station, AU	daily rain	7.0 mm (0.28 in)	4.2 mm (0.17 in)	51 years	20 of 100 (Routine)
2 September 2002	Merredin Research Station, AU	daily rain	9.8 mm (0.39 in)	1.0 mm (0.04 in)	4 years	12 of 100 (Routine)
18 April 2002	Merredin Research Station, AU	daily rain	28.5 mm (1.1 in)	6.9 mm (0.27 in)	72 years	38 of 100 (Notable)
23 September 2001	Merredin Research Station, AU	daily rain	13.8 mm (0.5 in)	1.9 mm (0.07 in)	43 years	20 of 100 (Routine)

Climate Trend

63 complete years, 1914 to 1983

One stripe for each of 63 complete years at Merredin Research Station, 1914 to 1983. Blue stripes are years cooler than the station's own mean of 17.8 C (64.0 F); red stripes are warmer. The coolest year was 1960, at 16.7 C (62.1 F), and the warmest was 1972, at 19.0 C (66.1 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Merredin Research Station as warming stripes, 1914 to 1983
Year	Annual mean temperature	Difference from the station mean
1914	17.4 C	-0.33 C
1915	17.8 C	+0.01 C
1916	16.7 C	-1.02 C
1918	17.6 C	-0.17 C
1919	17.3 C	-0.49 C
1920	17.4 C	-0.36 C
1921	18.0 C	+0.29 C
1922	17.1 C	-0.62 C
1924	16.8 C	-0.98 C
1926	17.4 C	-0.38 C
1927	17.4 C	-0.31 C
1928	17.5 C	-0.29 C
1929	16.9 C	-0.85 C
1930	18.2 C	+0.48 C
1931	16.8 C	-0.93 C
1932	17.6 C	-0.15 C
1933	17.5 C	-0.27 C
1934	17.8 C	+0.09 C
1935	17.5 C	-0.24 C
1936	18.3 C	+0.59 C
1937	18.0 C	+0.21 C
1938	18.2 C	+0.45 C
1939	17.8 C	+0.02 C
1940	18.3 C	+0.57 C
1941	18.0 C	+0.29 C
1942	17.3 C	-0.49 C
1943	17.0 C	-0.74 C
1944	17.8 C	+0.06 C
1945	18.2 C	+0.44 C
1946	17.5 C	-0.22 C
1947	17.1 C	-0.63 C
1948	18.1 C	+0.37 C
1949	18.1 C	+0.38 C
1950	17.7 C	-0.03 C
1951	17.4 C	-0.32 C
1952	17.2 C	-0.57 C
1953	17.4 C	-0.38 C
1954	17.6 C	-0.11 C
1955	17.3 C	-0.46 C
1956	17.3 C	-0.45 C
1957	18.2 C	+0.47 C
1958	18.0 C	+0.24 C
1959	18.6 C	+0.80 C
1960	16.7 C	-1.05 C
1961	18.2 C	+0.48 C
1962	18.3 C	+0.52 C
1963	18.1 C	+0.35 C
1964	17.2 C	-0.60 C
1965	18.1 C	+0.39 C
1966	17.4 C	-0.39 C
1970	17.8 C	+0.07 C
1972	19.0 C	+1.21 C
1973	17.8 C	+0.08 C
1974	17.7 C	-0.08 C
1975	17.8 C	+0.01 C
1976	18.5 C	+0.73 C
1977	18.9 C	+1.13 C
1978	18.4 C	+0.66 C
1979	18.1 C	+0.39 C
1980	18.5 C	+0.74 C
1981	17.8 C	+0.02 C
1982	18.4 C	+0.64 C
1983	18.7 C	+0.99 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1914 to 1983. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 63 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Merredin Research Station
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (0.1 to 0.2) per decade	0.2 F (0.1 to 0.4) per decade	1914 to 1983	63	Rise
Mean daily maximum	0.05 C (-0.03 to 0.13) per decade	0.1 F (-0.1 to 0.2) per decade	1914 to 1983	63	Not clearly different from zero
Mean daily minimum	0.2 C (0.2 to 0.3) per decade	0.4 F (0.3 to 0.5) per decade	1914 to 1983	63	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

1912 to 2013

Yearly extremes at Merredin Research Station: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.7 C (114.3 F)	1980	42.5 C (108.5 F)	74
Coldest night (TNn)	-3.9 C (25.0 F)	1914	-1.6 C (29.1 F)	74
Wettest day (Rx1day)	84.8 mm (3.3 in)	1971	32.4 mm (1.3 in)	94
Wettest five days (Rx5day)	113.5 mm (4.5 in)	1971	45.6 mm (1.8 in)	94
Longest dry spell (CDD)	101 days	1996	46 days	94

Hottest day (TXx)

The hottest day of the year at Merredin Research Station, 1912 to 2013. The record is 45.7 C (114.3 F) in 1980, marked on the chart; the median year is 42.5 C (108.5 F).

Hottest day (TXx) at Merredin Research Station by year
Year	Hottest day (TXx)
1912	43.9 C (111.0 F)
1913	45.0 C (113.0 F)
1914	43.0 C (109.4 F)
1915	42.9 C (109.2 F)
1916	40.8 C (105.4 F)
1917	43.9 C (111.0 F)
1918	42.2 C (108.0 F)
1919	43.3 C (109.9 F)
1920	41.2 C (106.2 F)
1921	43.3 C (109.9 F)
1922	42.2 C (108.0 F)
1923	41.6 C (106.9 F)
1924	40.9 C (105.6 F)
1925	41.6 C (106.9 F)
1926	41.8 C (107.2 F)
1927	40.2 C (104.4 F)
1928	42.1 C (107.8 F)
1929	41.8 C (107.2 F)
1930	44.6 C (112.3 F)
1931	40.5 C (104.9 F)
1932	42.3 C (108.1 F)
1933	43.5 C (110.3 F)
1934	43.5 C (110.3 F)
1935	43.0 C (109.4 F)
1936	41.7 C (107.1 F)
1937	41.2 C (106.2 F)
1938	40.6 C (105.1 F)
1939	44.3 C (111.7 F)
1940	43.6 C (110.5 F)
1941	41.9 C (107.4 F)
1942	42.7 C (108.9 F)
1943	40.6 C (105.1 F)
1944	44.5 C (112.1 F)
1945	42.2 C (108.0 F)
1946	42.2 C (108.0 F)
1947	43.6 C (110.5 F)
1948	42.9 C (109.2 F)
1949	44.7 C (112.5 F)
1950	42.1 C (107.8 F)
1951	41.1 C (106.0 F)
1952	42.6 C (108.7 F)
1953	44.5 C (112.1 F)
1954	44.5 C (112.1 F)
1955	42.3 C (108.1 F)
1956	44.4 C (111.9 F)
1957	41.6 C (106.9 F)
1958	42.8 C (109.0 F)
1959	41.1 C (106.0 F)
1960	40.6 C (105.1 F)
1961	44.1 C (111.4 F)
1962	43.4 C (110.1 F)
1963	42.1 C (107.8 F)
1964	41.1 C (106.0 F)
1965	41.7 C (107.1 F)
1966	40.5 C (104.9 F)
1967	41.9 C (107.4 F)
1968	43.5 C (110.3 F)
1969	43.7 C (110.7 F)
1970	43.1 C (109.6 F)
1971	41.4 C (106.5 F)
1972	42.5 C (108.5 F)
1973	41.0 C (105.8 F)
1974	43.1 C (109.6 F)
1975	43.8 C (110.8 F)
1976	43.1 C (109.6 F)
1977	43.8 C (110.8 F)
1978	42.5 C (108.5 F)
1979	44.0 C (111.2 F)
1980	45.7 C (114.3 F)
1981	42.7 C (108.9 F)
1982	42.4 C (108.3 F)
1983	42.4 C (108.3 F)
1984	41.4 C (106.5 F)
1985	43.6 C (110.5 F)
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2013	n/a

Coldest night (TNn)

The coldest night of the year at Merredin Research Station, 1912 to 2013. The record is -3.9 C (25.0 F) in 1914, marked on the chart; the median year is -1.6 C (29.1 F).

Coldest night (TNn) at Merredin Research Station by year
Year	Coldest night (TNn)
1912	7.8 C (46.0 F)
1913	-3.4 C (25.9 F)
1914	-3.9 C (25.0 F)
1915	-1.9 C (28.6 F)
1916	-3.3 C (26.1 F)
1917	-2.8 C (27.0 F)
1918	-2.2 C (28.0 F)
1919	-1.8 C (28.8 F)
1920	-3.7 C (25.3 F)
1921	-2.9 C (26.8 F)
1922	-2.7 C (27.1 F)
1923	-1.6 C (29.1 F)
1924	-1.6 C (29.1 F)
1925	-2.1 C (28.2 F)
1926	-1.1 C (30.0 F)
1927	-2.2 C (28.0 F)
1928	-1.3 C (29.7 F)
1929	-1.0 C (30.2 F)
1930	-1.4 C (29.5 F)
1931	-1.9 C (28.6 F)
1932	-2.1 C (28.2 F)
1933	-2.2 C (28.0 F)
1934	-2.0 C (28.4 F)
1935	-0.3 C (31.5 F)
1936	-1.7 C (28.9 F)
1937	-1.7 C (28.9 F)
1938	-0.3 C (31.5 F)
1939	-0.9 C (30.4 F)
1940	-2.6 C (27.3 F)
1941	0.7 C (33.3 F)
1942	-0.9 C (30.4 F)
1943	-2.2 C (28.0 F)
1944	-0.7 C (30.7 F)
1945	-0.1 C (31.8 F)
1946	-1.2 C (29.8 F)
1947	-3.4 C (25.9 F)
1948	-0.9 C (30.4 F)
1949	0.0 C (32.0 F)
1950	-2.2 C (28.0 F)
1951	-2.7 C (27.1 F)
1952	-2.2 C (28.0 F)
1953	-2.2 C (28.0 F)
1954	-1.8 C (28.8 F)
1955	-1.8 C (28.8 F)
1956	-1.8 C (28.8 F)
1957	-1.7 C (28.9 F)
1958	-0.4 C (31.3 F)
1959	-1.2 C (29.8 F)
1960	-1.6 C (29.1 F)
1961	-1.9 C (28.6 F)
1962	-1.0 C (30.2 F)
1963	1.3 C (34.3 F)
1964	-2.3 C (27.9 F)
1965	-0.1 C (31.8 F)
1966	-0.4 C (31.3 F)
1967	-1.0 C (30.2 F)
1968	-1.7 C (28.9 F)
1969	-2.1 C (28.2 F)
1970	-1.4 C (29.5 F)
1971	-0.8 C (30.6 F)
1972	-0.6 C (30.9 F)
1973	-1.0 C (30.2 F)
1974	-0.7 C (30.7 F)
1975	-1.5 C (29.3 F)
1976	-0.7 C (30.7 F)
1977	0.3 C (32.5 F)
1978	-0.8 C (30.6 F)
1979	-1.4 C (29.5 F)
1980	-0.8 C (30.6 F)
1981	-2.4 C (27.7 F)
1982	-2.0 C (28.4 F)
1983	0.0 C (32.0 F)
1984	0.4 C (32.7 F)
1985	3.5 C (38.3 F)
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2013	n/a

Wettest day (Rx1day)

The wettest day of the year at Merredin Research Station, 1912 to 2013. The record is 84.8 mm (3.3 in) in 1971, marked on the chart; the median year is 32.4 mm (1.3 in).

Wettest day (Rx1day) at Merredin Research Station by year
Year	Wettest day (Rx1day)
1912	20.3 mm (0.8 in)
1913	48.8 mm (1.9 in)
1914	29.2 mm (1.1 in)
1915	30.5 mm (1.2 in)
1916	29.0 mm (1.1 in)
1917	71.6 mm (2.8 in)
1918	32.3 mm (1.3 in)
1919	41.7 mm (1.6 in)
1920	34.5 mm (1.4 in)
1921	33.8 mm (1.3 in)
1922	38.4 mm (1.5 in)
1923	29.0 mm (1.1 in)
1924	21.8 mm (0.9 in)
1925	32.5 mm (1.3 in)
1926	19.8 mm (0.8 in)
1927	44.5 mm (1.8 in)
1928	17.8 mm (0.7 in)
1929	37.3 mm (1.5 in)
1930	40.4 mm (1.6 in)
1931	33.5 mm (1.3 in)
1932	30.2 mm (1.2 in)
1933	24.9 mm (1.0 in)
1934	62.5 mm (2.5 in)
1935	20.1 mm (0.8 in)
1936	28.2 mm (1.1 in)
1937	31.8 mm (1.3 in)
1938	22.9 mm (0.9 in)
1939	77.0 mm (3.0 in)
1940	43.7 mm (1.7 in)
1941	24.1 mm (0.9 in)
1942	35.8 mm (1.4 in)
1943	43.9 mm (1.7 in)
1944	49.3 mm (1.9 in)
1945	20.3 mm (0.8 in)
1946	31.5 mm (1.2 in)
1947	24.4 mm (1.0 in)
1948	33.3 mm (1.3 in)
1949	23.9 mm (0.9 in)
1950	18.3 mm (0.7 in)
1951	63.5 mm (2.5 in)
1952	35.1 mm (1.4 in)
1953	84.6 mm (3.3 in)
1954	36.6 mm (1.4 in)
1955	41.1 mm (1.6 in)
1956	38.6 mm (1.5 in)
1957	15.7 mm (0.6 in)
1958	29.2 mm (1.1 in)
1959	23.1 mm (0.9 in)
1960	38.1 mm (1.5 in)
1961	39.1 mm (1.5 in)
1962	22.4 mm (0.9 in)
1963	35.3 mm (1.4 in)
1964	14.5 mm (0.6 in)
1965	49.8 mm (2.0 in)
1966	31.8 mm (1.3 in)
1967	24.9 mm (1.0 in)
1968	46.5 mm (1.8 in)
1969	25.7 mm (1.0 in)
1970	53.3 mm (2.1 in)
1971	84.8 mm (3.3 in)
1972	35.1 mm (1.4 in)
1973	26.9 mm (1.1 in)
1974	68.8 mm (2.7 in)
1975	38.2 mm (1.5 in)
1976	19.6 mm (0.8 in)
1977	20.2 mm (0.8 in)
1978	40.3 mm (1.6 in)
1979	30.4 mm (1.2 in)
1980	14.7 mm (0.6 in)
1981	25.6 mm (1.0 in)
1982	20.0 mm (0.8 in)
1983	36.6 mm (1.4 in)
1984	26.2 mm (1.0 in)
1985	26.2 mm (1.0 in)
1986	24.0 mm (0.9 in)
1987	21.4 mm (0.8 in)
1988	48.8 mm (1.9 in)
1989	44.8 mm (1.8 in)
1990	54.8 mm (2.2 in)
1991	43.1 mm (1.7 in)
1992	45.4 mm (1.8 in)
1993	34.2 mm (1.3 in)
1994	15.4 mm (0.6 in)
1995	60.0 mm (2.4 in)
1996	25.6 mm (1.0 in)
1997	26.8 mm (1.1 in)
1998	25.0 mm (1.0 in)
1999	48.8 mm (1.9 in)
2000	45.0 mm (1.8 in)
2001	38.6 mm (1.5 in)
2002	28.5 mm (1.1 in)
2003	28.8 mm (1.1 in)
2004	23.0 mm (0.9 in)
2013	36.0 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Merredin Research Station, 1912 to 2013. The record is 113.5 mm (4.5 in) in 1971, marked on the chart; the median year is 45.6 mm (1.8 in).

Wettest five days (Rx5day) at Merredin Research Station by year
Year	Wettest five days (Rx5day)
1912	28.3 mm (1.1 in)
1913	70.4 mm (2.8 in)
1914	31.5 mm (1.2 in)
1915	53.1 mm (2.1 in)
1916	31.2 mm (1.2 in)
1917	105.9 mm (4.2 in)
1918	40.0 mm (1.6 in)
1919	76.1 mm (3.0 in)
1920	41.1 mm (1.6 in)
1921	47.3 mm (1.9 in)
1922	50.9 mm (2.0 in)
1923	43.2 mm (1.7 in)
1924	27.4 mm (1.1 in)
1925	45.5 mm (1.8 in)
1926	29.4 mm (1.2 in)
1927	96.8 mm (3.8 in)
1928	21.9 mm (0.9 in)
1929	39.1 mm (1.5 in)
1930	45.6 mm (1.8 in)
1931	37.9 mm (1.5 in)
1932	54.6 mm (2.1 in)
1933	38.1 mm (1.5 in)
1934	87.2 mm (3.4 in)
1935	33.1 mm (1.3 in)
1936	34.6 mm (1.4 in)
1937	43.0 mm (1.7 in)
1938	32.6 mm (1.3 in)
1939	88.2 mm (3.5 in)
1940	46.2 mm (1.8 in)
1941	54.9 mm (2.2 in)
1942	60.7 mm (2.4 in)
1943	81.6 mm (3.2 in)
1944	53.1 mm (2.1 in)
1945	53.9 mm (2.1 in)
1946	41.6 mm (1.6 in)
1947	29.2 mm (1.1 in)
1948	34.3 mm (1.4 in)
1949	26.2 mm (1.0 in)
1950	30.9 mm (1.2 in)
1951	68.8 mm (2.7 in)
1952	36.4 mm (1.4 in)
1953	93.0 mm (3.7 in)
1954	56.2 mm (2.2 in)
1955	50.2 mm (2.0 in)
1956	52.8 mm (2.1 in)
1957	38.0 mm (1.5 in)
1958	37.6 mm (1.5 in)
1959	45.8 mm (1.8 in)
1960	63.2 mm (2.5 in)
1961	49.0 mm (1.9 in)
1962	31.5 mm (1.2 in)
1963	45.8 mm (1.8 in)
1964	23.4 mm (0.9 in)
1965	70.4 mm (2.8 in)
1966	47.0 mm (1.9 in)
1967	24.9 mm (1.0 in)
1968	67.6 mm (2.7 in)
1969	32.9 mm (1.3 in)
1970	75.9 mm (3.0 in)
1971	113.5 mm (4.5 in)
1972	49.5 mm (1.9 in)
1973	42.7 mm (1.7 in)
1974	87.2 mm (3.4 in)
1975	42.2 mm (1.7 in)
1976	29.4 mm (1.2 in)
1977	26.8 mm (1.1 in)
1978	79.6 mm (3.1 in)
1979	45.2 mm (1.8 in)
1980	21.6 mm (0.9 in)
1981	40.8 mm (1.6 in)
1982	27.4 mm (1.1 in)
1983	69.0 mm (2.7 in)
1984	34.3 mm (1.4 in)
1985	37.4 mm (1.5 in)
1986	33.4 mm (1.3 in)
1987	33.4 mm (1.3 in)
1988	50.2 mm (2.0 in)
1989	53.0 mm (2.1 in)
1990	85.4 mm (3.4 in)
1991	52.2 mm (2.1 in)
1992	51.6 mm (2.0 in)
1993	54.5 mm (2.1 in)
1994	27.7 mm (1.1 in)
1995	73.2 mm (2.9 in)
1996	29.8 mm (1.2 in)
1997	36.6 mm (1.4 in)
1998	43.2 mm (1.7 in)
1999	100.2 mm (3.9 in)
2000	61.2 mm (2.4 in)
2001	86.6 mm (3.4 in)
2002	44.7 mm (1.8 in)
2003	50.5 mm (2.0 in)
2004	29.5 mm (1.2 in)
2013	62.2 mm (2.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Merredin Research Station, 1912 to 2013. The record is 101 days in 1996, marked on the chart; the median year is 46 days.

Longest dry spell (CDD) at Merredin Research Station by year
Year	Longest dry spell (CDD)
1912	40 days
1913	75 days
1914	48 days
1915	71 days
1916	41 days
1917	41 days
1918	36 days
1919	88 days
1920	41 days
1921	40 days
1922	57 days
1923	67 days
1924	42 days
1925	31 days
1926	36 days
1927	45 days
1928	70 days
1929	46 days
1930	63 days
1931	53 days
1932	55 days
1933	48 days
1934	46 days
1935	40 days
1936	46 days
1937	31 days
1938	55 days
1939	44 days
1940	92 days
1941	56 days
1942	37 days
1943	29 days
1944	54 days
1945	82 days
1946	73 days
1947	44 days
1948	42 days
1949	43 days
1950	100 days
1951	33 days
1952	40 days
1953	41 days
1954	72 days
1955	35 days
1956	64 days
1957	89 days
1958	56 days
1959	37 days
1960	37 days
1961	56 days
1962	48 days
1963	27 days
1964	36 days
1965	32 days
1966	50 days
1967	61 days
1968	43 days
1969	51 days
1970	46 days
1971	33 days
1972	61 days
1973	51 days
1974	39 days
1975	58 days
1976	49 days
1977	49 days
1978	38 days
1979	47 days
1980	46 days
1981	35 days
1982	42 days
1983	40 days
1984	40 days
1985	45 days
1986	37 days
1987	48 days
1988	33 days
1989	51 days
1990	34 days
1991	58 days
1992	36 days
1993	43 days
1994	75 days
1995	41 days
1996	101 days
1997	48 days
1998	61 days
1999	32 days
2000	47 days
2001	57 days
2002	73 days
2003	47 days
2004	37 days
2013	36 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

52 years with a frost

Across 52 years with a frost, the median last spring frost at Merredin Research Station falls on 5 September and the median first autumn frost on 30 June, which leaves a median of 306 days between them.

Fitted over all years, the growing season changes by +6.4 days per decade at this station.

Frost dates and growing season at Merredin Research Station
Measure	Median, all years	Earliest period	Recent period (1942 to 1982)	Recent against earliest	Fitted trend
Last spring frost	5 September	n/a	5 September	n/a	-2.4 days per decade
First autumn frost	30 June	n/a	8 July	n/a	+4.0 days per decade
Growing days	306 days	n/a	311 days	n/a	+6.4 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

92 years, 1912 to 2003

A day with at least 32.2 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 88.6 mm (3.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Merredin Research Station: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	32.2 mm (1.3 in)
5 years	45.1 mm (1.8 in)
10 years	54.5 mm (2.1 in)
25 years	67.3 mm (2.6 in)
50 years	77.6 mm (3.1 in)
100 years	88.6 mm (3.5 in)	Longer than the 92 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, 92 years of values from 1912 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: 84.8 mm (3.3 in) in 1971; 84.6 mm (3.3 in) in 1953; 77.0 mm (3.0 in) in 1939.

Station Changes

2 suspected

2 changes were suspected in the annual mean temperature of Merredin Research Station, at 1934 and 1960. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1934 ran 0.4 C (0.6 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1960 ran 0.2 C (0.3 F) lower than in the years before (possible change).

Suspected changes in the annual mean temperature at Merredin Research Station, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1934	+0.4	+0.6	likely	5
1960	-0.2	-0.3	possible	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 Merredin Research Station standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Merredin Research Station 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).