Casterton Showgrounds Weather Records (ASN00090135)

Record envelope, standing records and threshold days for Casterton Showgrounds (ASN00090135), Australia, with 63 years of record.

Key Facts for Casterton Showgrounds

Casterton Showgrounds (ASN00090135) is a weather station in Australia at -37.59 latitude and 141.41 longitude, 71 m (233 ft) above sea level.
The station reports from 1956 to 2018, 63 years of record.
1,464 records set at Casterton Showgrounds still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Casterton Showgrounds set a daily record precipitation of 21.4 mm (0.8 in) on 4 May 2018.

About the Station

Location: Australia, -37.59 latitude, 141.41 longitude.
Elevation: 71 m (233 ft).
Period of record: 1956 to 2018, 63 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 Casterton Showgrounds. 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 Casterton Showgrounds, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	44.3 C (111.7 F)	2.6 C (36.7 F)	n/a	n/a
Feb	43.7 C (110.7 F)	1.8 C (35.2 F)	n/a	n/a
Mar	40.4 C (104.7 F)	1.5 C (34.7 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-2.4 C (27.7 F)	n/a	n/a
May	29.0 C (84.2 F)	-1.8 C (28.8 F)	n/a	n/a
Jun	22.8 C (73.0 F)	-4.0 C (24.8 F)	n/a	n/a
Jul	22.5 C (72.5 F)	-4.6 C (23.7 F)	n/a	n/a
Aug	25.0 C (77.0 F)	-3.5 C (25.7 F)	n/a	n/a
Sep	32.1 C (89.8 F)	-2.0 C (28.4 F)	n/a	n/a
Oct	35.2 C (95.4 F)	-1.7 C (28.9 F)	n/a	n/a
Nov	40.0 C (104.0 F)	-0.8 C (30.6 F)	n/a	n/a
Dec	43.0 C (109.4 F)	0.4 C (32.7 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Casterton Showgrounds still stand. 1982 holds the most, with 48.

Standing records at Casterton Showgrounds by the year they were set
Year set	Standing records
1957	42
1958	24
1959	33
1960	46
1961	20
1962	23
1963	26
1964	23
1965	25
1966	25
1967	30
1968	26
1969	26
1970	25
1971	18
1972	35
1973	23
1974	22
1975	30
1976	17
1977	32
1978	22
1979	17
1980	33
1981	22
1982	48
1983	35
1984	20
1985	34
1986	20
1987	39
1988	23
1989	14
1990	23
1991	18
1992	19
1993	30
1994	38
1995	27
1996	37
1997	25
1998	22
1999	27
2000	23
2001	30
2002	21
2003	19
2004	19
2005	35
2006	40
2007	25
2008	22
2009	44
2010	20
2011	2

All-Time Record Progression

3 new records

3 all-time records were set at Casterton Showgrounds between 20 March 2003 and 20 January 2007. Each dot is a new record.

When Casterton Showgrounds set new all-time records
Date	Kind	Detail
2003-03-20	Record daily precipitation	Record daily precipitation 83.2 mm (3.3 in)
2006-01-22	Record high minimum temperature	Record high minimum temperature 27.8 C (82.0 F)
2007-01-20	Record daily precipitation	Record daily precipitation 114.0 mm (4.5 in)

Wettest Day of Each Month

Jan: 114.0 mm (4.5 in)

The wettest day on record for each calendar month at Casterton Showgrounds. The most was 114.0 mm (4.5 in) on 20 January 2007.

Record daily precipitation for each month at Casterton Showgrounds
Month	Record daily precipitation (mm)	Date
Jan	114.0 mm (4.5 in)	20 January 2007
Feb	49.0 mm (1.9 in)	1 February 1960
Mar	83.2 mm (3.3 in)	20 March 2003
Apr	59.4 mm (2.3 in)	6 April 1992
May	48.0 mm (1.9 in)	3 May 2014
Jun	45.4 mm (1.8 in)	22 June 1987
Jul	39.0 mm (1.5 in)	1 July 2012
Aug	35.0 mm (1.4 in)	7 August 1978
Sep	53.0 mm (2.1 in)	28 September 1979
Oct	44.0 mm (1.7 in)	23 October 1985
Nov	73.6 mm (2.9 in)	29 November 1977
Dec	86.0 mm (3.4 in)	13 December 2008

Period of Record Coverage

1957 to 2011

55 years of record at Casterton Showgrounds, 1957 to 2011. 1 years have data for under 90 percent of days and are left out of rankings: 2011.

Days with data per year at Casterton Showgrounds
Year	Days with data	Share of year	Complete
1957	362	99%	Yes
1958	364	100%	Yes
1959	364	100%	Yes
1960	363	99%	Yes
1961	365	100%	Yes
1962	364	100%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	361	99%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	359	98%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	364	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	358	98%	Yes
1983	354	97%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	356	98%	Yes
1987	360	99%	Yes
1988	357	98%	Yes
1989	349	96%	Yes
1990	359	98%	Yes
1991	362	99%	Yes
1992	362	99%	Yes
1993	365	100%	Yes
1994	360	99%	Yes
1995	365	100%	Yes
1996	362	99%	Yes
1997	356	98%	Yes
1998	354	97%	Yes
1999	357	98%	Yes
2000	356	97%	Yes
2001	357	98%	Yes
2002	358	98%	Yes
2003	360	99%	Yes
2004	352	96%	Yes
2005	333	91%	Yes
2006	347	95%	Yes
2007	362	99%	Yes
2008	353	96%	Yes
2009	359	98%	Yes
2010	340	93%	Yes
2011	34	9%	No

Latest Records

Latest records at Casterton Showgrounds
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 May 2018	Casterton Showgrounds, AU	daily rain	21.4 mm (0.8 in)	2.3 mm (0.09 in)	47 years	20 of 100 (Routine)
15 April 2018	Casterton Showgrounds, AU	daily rain	10.4 mm (0.4 in)	1.3 mm (0.05 in)	44 years	20 of 100 (Routine)
1 December 2017	Casterton Showgrounds, AU	daily rain	16.2 mm (0.6 in)	3.4 mm (0.13 in)	30 years	20 of 100 (Routine)
17 November 2017	Casterton Showgrounds, AU	daily rain	17.4 mm (0.7 in)	9.5 mm (0.37 in)	52 years	20 of 100 (Routine)
16 November 2017	Casterton Showgrounds, AU	daily rain	38.4 mm (1.5 in)	23.9 mm (0.9 in)	47 years	58 of 100 (Notable)
12 October 2017	Casterton Showgrounds, AU	daily rain	18.6 mm (0.7 in)	3.9 mm (0.15 in)	44 years	20 of 100 (Routine)
24 September 2017	Casterton Showgrounds, AU	daily rain	16.0 mm (0.6 in)	3.1 mm (0.12 in)	11 years	14 of 100 (Routine)
6 August 2017	Casterton Showgrounds, AU	daily rain	18.6 mm (0.7 in)	1.3 mm (0.05 in)	58 years	20 of 100 (Routine)
25 April 2017	Casterton Showgrounds, AU	daily rain	31.0 mm (1.2 in)	10.6 mm (0.4 in)	26 years	34 of 100 (Routine)
21 April 2017	Casterton Showgrounds, AU	daily rain	31.8 mm (1.3 in)	11.7 mm (0.5 in)	56 years	47 of 100 (Notable)
28 December 2016	Casterton Showgrounds, AU	daily rain	16.2 mm (0.6 in)	10.1 mm (0.4 in)	54 years	20 of 100 (Routine)
13 November 2016	Casterton Showgrounds, AU	daily rain	14.8 mm (0.6 in)	3.4 mm (0.13 in)	50 years	20 of 100 (Routine)
18 October 2016	Casterton Showgrounds, AU	daily rain	17.6 mm (0.7 in)	4.2 mm (0.17 in)	24 years	20 of 100 (Routine)
9 September 2016	Casterton Showgrounds, AU	daily rain	47.6 mm (1.9 in)	29.2 mm (1.1 in)	15 years	50 of 100 (Notable)
25 February 2016	Casterton Showgrounds, AU	daily rain	13.0 mm (0.5 in)	2.6 mm (0.10 in)	48 years	20 of 100 (Routine)
23 January 2016	Casterton Showgrounds, AU	daily rain	13.6 mm (0.5 in)	3.8 mm (0.15 in)	24 years	17 of 100 (Routine)
10 May 2015	Casterton Showgrounds, AU	daily rain	25.0 mm (1.0 in)	13.3 mm (0.5 in)	41 years	44 of 100 (Notable)
2 April 2015	Casterton Showgrounds, AU	daily rain	5.0 mm (0.20 in)	1.6 mm (0.06 in)	20 years	15 of 100 (Routine)
13 January 2015	Casterton Showgrounds, AU	daily rain	39.0 mm (1.5 in)	28.2 mm (1.1 in)	4 years	40 of 100 (Notable)
29 June 2014	Casterton Showgrounds, AU	daily rain	15.6 mm (0.6 in)	1.6 mm (0.06 in)	36 years	19 of 100 (Routine)

Climate Trend

54 complete years, 1957 to 2010

One stripe for each of 54 complete years at Casterton Showgrounds, 1957 to 2010. Blue stripes are years cooler than the station's own mean of 14.1 C (57.4 F); red stripes are warmer. The coolest year was 1964, at 13.4 C (56.2 F), and the warmest was 2007, at 15.1 C (59.2 F). The strongest colour marks a difference of 1.0 C (1.8 F).

Annual mean temperature at Casterton Showgrounds as warming stripes, 1957 to 2010
Year	Annual mean temperature	Difference from the station mean
1957	13.5 C	-0.66 C
1958	13.5 C	-0.63 C
1959	14.5 C	+0.31 C
1960	13.7 C	-0.42 C
1961	14.9 C	+0.78 C
1962	14.2 C	+0.09 C
1963	14.1 C	+0.00 C
1964	13.4 C	-0.71 C
1965	13.9 C	-0.27 C
1966	13.8 C	-0.33 C
1967	14.2 C	+0.07 C
1968	14.3 C	+0.14 C
1969	13.9 C	-0.28 C
1970	13.7 C	-0.42 C
1971	14.4 C	+0.23 C
1972	14.2 C	+0.07 C
1973	14.4 C	+0.27 C
1974	14.5 C	+0.39 C
1975	14.4 C	+0.30 C
1976	14.0 C	-0.12 C
1977	13.9 C	-0.20 C
1978	13.8 C	-0.30 C
1979	14.2 C	+0.06 C
1980	14.4 C	+0.26 C
1981	14.6 C	+0.46 C
1982	14.3 C	+0.14 C
1983	14.1 C	-0.01 C
1984	13.7 C	-0.40 C
1985	14.0 C	-0.14 C
1986	13.4 C	-0.71 C
1987	13.6 C	-0.53 C
1988	14.9 C	+0.73 C
1989	14.2 C	+0.09 C
1990	14.4 C	+0.30 C
1991	14.1 C	-0.04 C
1992	13.9 C	-0.28 C
1993	14.2 C	+0.08 C
1994	13.9 C	-0.28 C
1995	13.8 C	-0.39 C
1996	13.6 C	-0.53 C
1997	14.1 C	-0.02 C
1998	13.9 C	-0.25 C
1999	14.5 C	+0.35 C
2000	14.7 C	+0.58 C
2001	14.3 C	+0.16 C
2002	14.0 C	-0.10 C
2003	14.1 C	-0.09 C
2004	14.0 C	-0.14 C
2005	14.7 C	+0.52 C
2006	14.0 C	-0.11 C
2007	15.1 C	+0.95 C
2008	14.2 C	+0.02 C
2009	14.7 C	+0.59 C
2010	14.3 C	+0.16 C

The fitted trend in annual mean temperature here over 1957 to 2010 is 0.06 C (0.00 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.11 F (-0.01 to 0.23) 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 Casterton Showgrounds
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.06 C (0.00 to 0.13) per decade	0.11 F (-0.01 to 0.23) per decade	1957 to 2010	54	Not clearly different from zero
Mean daily maximum	0.13 C (0.04 to 0.22) per decade	0.2 F (0.1 to 0.4) per decade	1957 to 2010	54	Rise
Mean daily minimum	-0.01 C (-0.08 to 0.07) per decade	-0.02 F (-0.15 to 0.12) per decade	1957 to 2010	54	Not clearly different from zero

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

1956 to 2018

Yearly extremes at Casterton Showgrounds: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.3 C (111.7 F)	1959	41.0 C (105.8 F)	55
Coldest night (TNn)	-4.6 C (23.7 F)	1965	-2.1 C (28.2 F)	55
Wettest day (Rx1day)	114.0 mm (4.5 in)	2007	32.6 mm (1.3 in)	63
Wettest five days (Rx5day)	134.0 mm (5.3 in)	2007	55.9 mm (2.2 in)	63
Longest dry spell (CDD)	48 days	2013	26 days	63

Hottest day (TXx)

The hottest day of the year at Casterton Showgrounds, 1956 to 2018. The record is 44.3 C (111.7 F) in 1959, marked on the chart; the median year is 41.0 C (105.8 F).

Hottest day (TXx) at Casterton Showgrounds by year
Year	Hottest day (TXx)
1956	n/a
1957	38.4 C (101.1 F)
1958	37.9 C (100.2 F)
1959	44.3 C (111.7 F)
1960	40.0 C (104.0 F)
1961	42.1 C (107.8 F)
1962	40.0 C (104.0 F)
1963	38.1 C (100.6 F)
1964	41.1 C (106.0 F)
1965	39.9 C (103.8 F)
1966	40.1 C (104.2 F)
1967	42.3 C (108.1 F)
1968	41.8 C (107.2 F)
1969	38.9 C (102.0 F)
1970	42.2 C (108.0 F)
1971	39.3 C (102.7 F)
1972	39.7 C (103.5 F)
1973	42.0 C (107.6 F)
1974	36.8 C (98.2 F)
1975	40.4 C (104.7 F)
1976	38.2 C (100.8 F)
1977	42.0 C (107.6 F)
1978	39.5 C (103.1 F)
1979	41.0 C (105.8 F)
1980	43.0 C (109.4 F)
1981	43.0 C (109.4 F)
1982	44.0 C (111.2 F)
1983	43.7 C (110.7 F)
1984	37.4 C (99.3 F)
1985	41.9 C (107.4 F)
1986	40.0 C (104.0 F)
1987	37.8 C (100.0 F)
1988	39.8 C (103.6 F)
1989	39.0 C (102.2 F)
1990	37.2 C (99.0 F)
1991	41.4 C (106.5 F)
1992	39.4 C (102.9 F)
1993	41.0 C (105.8 F)
1994	41.0 C (105.8 F)
1995	39.8 C (103.6 F)
1996	42.0 C (107.6 F)
1997	41.8 C (107.2 F)
1998	41.8 C (107.2 F)
1999	40.2 C (104.4 F)
2000	41.0 C (105.8 F)
2001	41.3 C (106.3 F)
2002	38.0 C (100.4 F)
2003	41.8 C (107.2 F)
2004	42.4 C (108.3 F)
2005	41.0 C (105.8 F)
2006	42.2 C (108.0 F)
2007	41.8 C (107.2 F)
2008	40.4 C (104.7 F)
2009	44.0 C (111.2 F)
2010	42.5 C (108.5 F)
2011	39.4 C (102.9 F)
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a

Coldest night (TNn)

The coldest night of the year at Casterton Showgrounds, 1956 to 2018. The record is -4.6 C (23.7 F) in 1965, marked on the chart; the median year is -2.1 C (28.2 F).

Coldest night (TNn) at Casterton Showgrounds by year
Year	Coldest night (TNn)
1956	n/a
1957	-2.8 C (27.0 F)
1958	-2.4 C (27.7 F)
1959	-2.9 C (26.8 F)
1960	-2.2 C (28.0 F)
1961	-2.8 C (27.0 F)
1962	-1.7 C (28.9 F)
1963	-4.3 C (24.3 F)
1964	-2.7 C (27.1 F)
1965	-4.6 C (23.7 F)
1966	-3.4 C (25.9 F)
1967	-2.6 C (27.3 F)
1968	-3.1 C (26.4 F)
1969	-2.9 C (26.8 F)
1970	-0.6 C (30.9 F)
1971	-0.9 C (30.4 F)
1972	-4.0 C (24.8 F)
1973	-2.9 C (26.8 F)
1974	-3.5 C (25.7 F)
1975	-3.4 C (25.9 F)
1976	-4.2 C (24.4 F)
1977	-1.2 C (29.8 F)
1978	-1.4 C (29.5 F)
1979	-1.8 C (28.8 F)
1980	-1.0 C (30.2 F)
1981	-1.0 C (30.2 F)
1982	-3.8 C (25.2 F)
1983	-1.0 C (30.2 F)
1984	-1.5 C (29.3 F)
1985	-3.0 C (26.6 F)
1986	-0.5 C (31.1 F)
1987	-2.0 C (28.4 F)
1988	0.2 C (32.4 F)
1989	-1.5 C (29.3 F)
1990	-0.5 C (31.1 F)
1991	-0.6 C (30.9 F)
1992	-2.0 C (28.4 F)
1993	-1.6 C (29.1 F)
1994	-2.5 C (27.5 F)
1995	-1.6 C (29.1 F)
1996	-2.4 C (27.7 F)
1997	-3.5 C (25.7 F)
1998	-3.2 C (26.2 F)
1999	-2.4 C (27.7 F)
2000	-2.0 C (28.4 F)
2001	-1.2 C (29.8 F)
2002	-2.5 C (27.5 F)
2003	-1.5 C (29.3 F)
2004	-1.5 C (29.3 F)
2005	-1.0 C (30.2 F)
2006	-3.2 C (26.2 F)
2007	-2.1 C (28.2 F)
2008	-1.8 C (28.8 F)
2009	-1.1 C (30.0 F)
2010	-3.0 C (26.6 F)
2011	5.0 C (41.0 F)
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a

Wettest day (Rx1day)

The wettest day of the year at Casterton Showgrounds, 1956 to 2018. The record is 114.0 mm (4.5 in) in 2007, marked on the chart; the median year is 32.6 mm (1.3 in).

Wettest day (Rx1day) at Casterton Showgrounds by year
Year	Wettest day (Rx1day)
1956	14.2 mm (0.6 in)
1957	36.8 mm (1.4 in)
1958	35.6 mm (1.4 in)
1959	23.4 mm (0.9 in)
1960	49.0 mm (1.9 in)
1961	23.6 mm (0.9 in)
1962	23.1 mm (0.9 in)
1963	38.9 mm (1.5 in)
1964	31.5 mm (1.2 in)
1965	24.1 mm (0.9 in)
1966	31.2 mm (1.2 in)
1967	19.6 mm (0.8 in)
1968	25.7 mm (1.0 in)
1969	32.3 mm (1.3 in)
1970	33.0 mm (1.3 in)
1971	33.5 mm (1.3 in)
1972	47.0 mm (1.9 in)
1973	44.2 mm (1.7 in)
1974	27.4 mm (1.1 in)
1975	37.2 mm (1.5 in)
1976	28.8 mm (1.1 in)
1977	73.6 mm (2.9 in)
1978	35.0 mm (1.4 in)
1979	53.0 mm (2.1 in)
1980	19.0 mm (0.7 in)
1981	26.4 mm (1.0 in)
1982	17.4 mm (0.7 in)
1983	37.2 mm (1.5 in)
1984	35.0 mm (1.4 in)
1985	44.0 mm (1.7 in)
1986	81.2 mm (3.2 in)
1987	45.4 mm (1.8 in)
1988	34.2 mm (1.3 in)
1989	30.2 mm (1.2 in)
1990	25.6 mm (1.0 in)
1991	32.6 mm (1.3 in)
1992	59.4 mm (2.3 in)
1993	31.2 mm (1.2 in)
1994	24.2 mm (1.0 in)
1995	31.0 mm (1.2 in)
1996	25.8 mm (1.0 in)
1997	31.4 mm (1.2 in)
1998	29.8 mm (1.2 in)
1999	54.6 mm (2.1 in)
2000	26.2 mm (1.0 in)
2001	29.2 mm (1.1 in)
2002	27.6 mm (1.1 in)
2003	83.2 mm (3.3 in)
2004	27.4 mm (1.1 in)
2005	21.4 mm (0.8 in)
2006	23.2 mm (0.9 in)
2007	114.0 mm (4.5 in)
2008	86.0 mm (3.4 in)
2009	34.2 mm (1.3 in)
2010	40.0 mm (1.6 in)
2011	73.6 mm (2.9 in)
2012	39.0 mm (1.5 in)
2013	24.8 mm (1.0 in)
2014	48.0 mm (1.9 in)
2015	39.0 mm (1.5 in)
2016	47.6 mm (1.9 in)
2017	38.4 mm (1.5 in)
2018	22.0 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Casterton Showgrounds, 1956 to 2018. The record is 134.0 mm (5.3 in) in 2007, marked on the chart; the median year is 55.9 mm (2.2 in).

Wettest five days (Rx5day) at Casterton Showgrounds by year
Year	Wettest five days (Rx5day)
1956	25.7 mm (1.0 in)
1957	60.5 mm (2.4 in)
1958	70.9 mm (2.8 in)
1959	55.4 mm (2.2 in)
1960	71.6 mm (2.8 in)
1961	44.4 mm (1.7 in)
1962	50.9 mm (2.0 in)
1963	62.3 mm (2.5 in)
1964	77.9 mm (3.1 in)
1965	38.1 mm (1.5 in)
1966	71.6 mm (2.8 in)
1967	34.3 mm (1.4 in)
1968	66.0 mm (2.6 in)
1969	44.5 mm (1.8 in)
1970	68.2 mm (2.7 in)
1971	73.9 mm (2.9 in)
1972	69.9 mm (2.8 in)
1973	55.9 mm (2.2 in)
1974	54.8 mm (2.2 in)
1975	63.2 mm (2.5 in)
1976	50.8 mm (2.0 in)
1977	105.2 mm (4.1 in)
1978	59.8 mm (2.4 in)
1979	70.4 mm (2.8 in)
1980	36.0 mm (1.4 in)
1981	47.0 mm (1.9 in)
1982	23.2 mm (0.9 in)
1983	64.2 mm (2.5 in)
1984	63.0 mm (2.5 in)
1985	72.4 mm (2.9 in)
1986	98.2 mm (3.9 in)
1987	80.0 mm (3.1 in)
1988	53.2 mm (2.1 in)
1989	55.4 mm (2.2 in)
1990	36.0 mm (1.4 in)
1991	53.0 mm (2.1 in)
1992	65.6 mm (2.6 in)
1993	45.0 mm (1.8 in)
1994	38.8 mm (1.5 in)
1995	61.2 mm (2.4 in)
1996	65.2 mm (2.6 in)
1997	51.8 mm (2.0 in)
1998	43.0 mm (1.7 in)
1999	76.4 mm (3.0 in)
2000	55.0 mm (2.2 in)
2001	50.0 mm (2.0 in)
2002	48.8 mm (1.9 in)
2003	85.2 mm (3.4 in)
2004	50.8 mm (2.0 in)
2005	37.6 mm (1.5 in)
2006	30.0 mm (1.2 in)
2007	134.0 mm (5.3 in)
2008	96.4 mm (3.8 in)
2009	54.8 mm (2.2 in)
2010	105.0 mm (4.1 in)
2011	129.2 mm (5.1 in)
2012	57.4 mm (2.3 in)
2013	52.6 mm (2.1 in)
2014	86.4 mm (3.4 in)
2015	46.4 mm (1.8 in)
2016	51.0 mm (2.0 in)
2017	63.8 mm (2.5 in)
2018	40.6 mm (1.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Casterton Showgrounds, 1956 to 2018. The record is 48 days in 2013, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at Casterton Showgrounds by year
Year	Longest dry spell (CDD)
1956	6 days
1957	23 days
1958	29 days
1959	27 days
1960	20 days
1961	28 days
1962	22 days
1963	29 days
1964	22 days
1965	34 days
1966	15 days
1967	38 days
1968	30 days
1969	33 days
1970	38 days
1971	22 days
1972	37 days
1973	12 days
1974	39 days
1975	31 days
1976	14 days
1977	19 days
1978	15 days
1979	16 days
1980	35 days
1981	26 days
1982	20 days
1983	33 days
1984	20 days
1985	29 days
1986	29 days
1987	36 days
1988	33 days
1989	21 days
1990	14 days
1991	38 days
1992	22 days
1993	28 days
1994	25 days
1995	15 days
1996	35 days
1997	16 days
1998	21 days
1999	17 days
2000	21 days
2001	26 days
2002	37 days
2003	24 days
2004	22 days
2005	27 days
2006	36 days
2007	26 days
2008	26 days
2009	40 days
2010	16 days
2011	22 days
2012	26 days
2013	48 days
2014	43 days
2015	29 days
2016	17 days
2017	21 days
2018	16 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 Casterton Showgrounds falls on 5 September and the median first autumn frost on 30 May, which leaves a median of 267 days between them.

Fitted over all years, the growing season changes by -7.0 days per decade at this station.

Frost dates and growing season at Casterton Showgrounds
Measure	Median, all years	Earliest period	Recent period (1975 to 2009)	Recent against earliest	Fitted trend
Last spring frost	5 September	n/a	11 September	n/a	+4.5 days per decade
First autumn frost	30 May	n/a	29 May	n/a	-2.6 days per decade
Growing days	267 days	n/a	256 days	n/a	-7.0 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

60 years, 1957 to 2017

A day with at least 32.6 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 115.1 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Casterton Showgrounds: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	32.6 mm (1.3 in)
5 years	45.8 mm (1.8 in)
10 years	57.3 mm (2.3 in)
25 years	76.0 mm (3.0 in)
50 years	93.6 mm (3.7 in)
100 years	115.1 mm (4.5 in)	Longer than the 60 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, 60 years of values from 1957 to 2017.

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: 114.0 mm (4.5 in) in 2007; 86.0 mm (3.4 in) in 2008; 83.2 mm (3.3 in) in 2003.

Station Changes

3 suspected

3 changes were suspected in the annual mean temperature of Casterton Showgrounds, at 1965, 1977 and 1988. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1965 ran 0.2 C (0.3 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1977 ran 0.2 C (0.4 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1988 ran 0.1 C (0.2 F) higher than in the years before (possible change).

Suspected changes in the annual mean temperature at Casterton Showgrounds, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1965	-0.2	-0.3	likely	5
1977	-0.2	-0.4	possible	5
1988	+0.1	+0.2	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 Casterton Showgrounds standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Casterton Showgrounds 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).