Monday, 4 December 2023 - Seasonal Climate Summary for Greater Perth - Product code IDCKGC21L0

Greater Perth in spring 2023

Rainfall

  • Spring rainfall totals were in the 50-80 mm range at most sites, up to 100-140 mm in the Perth Hills, which were about 40% to 60% of spring mean rainfall.
  • Perth Metro recorded 56.8 mm for spring 2023, which was 39% of the spring mean rainfall (147.0 mm), and the lowest spring rainfall on record.
  • Werribee had its highest spring daily rainfall on record.

Temperature

Perth Metro

  • Total rainfall for Perth Metro was 56.8 mm, which is 39% of the long-term average of 147.0 mm.
  • The mean daily maximum temperature for Perth Metro was 26.3 °C, which is 2.8 °C above the long-term average of 23.5 °C.
  • The warmest day was 39.0 °C on 23 November, and the coolest day was on 3 September when the temperature reached 17.1 °C.
  • The mean daily minimum temperature for Perth Metro was 14.2 °C, which is 2.4 °C above the long-term average of 11.8 °C.
  • The coldest morning was 5.2 °C on 7 September, and the warmest morning was on 23 November when the minimum temperature was 23.6 °C.

Extremes Maps Records Summaries Important notes the top

Extremes in spring 2023
Hottest day 40.3 °C at Pearce RAAF on 25 Nov
Warmest days on average 27.7 °C at Pearce RAAF
Coolest days on average 23.1 °C at Rottnest Island
Coldest day 13.3 °C at Bickley on 3 Sep
Coldest night 2.8 °C at Bickley on 7 Sep
Coolest nights on average 11.9 °C at Bickley
Warmest nights on average 15.8 °C at Rottnest Island
Warmest night 25.6 °C at Pearce RAAF on 23 Nov
25.6 °C at Swanbourne on 23 Nov
Warmest on average overall 20.5 °C at Pearce RAAF
Coolest on average overall 18.2 °C at Bickley
Wettest overall 182.4 mm at Huntly
Wettest day 45.4 mm at Bungendore on 14 Sep
Strongest wind gust 128 km/h at Rottnest Island on 13 Sep

Extremes Maps Records Summaries Important notes the top

Record highest spring daily rainfall
New record
(mm)		 Old
record		 Years of
record
Werribee 38.8 on 14 Sep 33.0 on 29 Sep 2001 23


Record highest spring temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
spring
Rottnest Island 38.4 on 23 Nov 36.6 on 3 Nov 1997 36 20.8
Garden Island HSF 39.7 on 23 Nov 38.1 on 9 Nov 2019 23 21.2
Mandurah 39.6 on 25 Nov 37.7 on 15 Nov 2019 23 21.9


Record highest spring mean daily maximum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
spring
Perth Airport 27.2 26.3 in 2015 79 23.0
Pearce RAAF 27.7 27.3 in 2015 62 23.7
Karnet 24.1 23.8 in 2015 55 21.0
Jandakot Aero 26.3 25.5 in 2010 33 23.1
Rottnest Island 23.1 22.4 in 2010 32 20.8
Swanbourne 25.0 24.7 in 2010 30 22.5
Bickley 24.4 23.7 in 2015 29 21.2
Perth Metro 26.3 25.9 in 2015 29 23.5
Garden Island HSF 23.9 23.1 in 2010 21 21.2
Mandurah 24.4 23.7 in 2015 21 21.9


Record highest spring daily minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
spring
Rottnest Island 24.9 on 23 Nov 22.2 on 22 Nov 2015 36 14.3
Swanbourne 25.6 on 23 Nov 24.3 on 30 Nov 2022 31 12.7
Garden Island HSF 24.0 on 23 Nov 23.6 on 23 Nov 2004 23 13.7


Record highest spring mean daily minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
spring
Perth Airport 13.2 12.5 in 1963 79 10.7
Pearce RAAF 13.4 12.2 in 2013 62 10.5
Jandakot Aero 13.1 12.1 in 2013 33 10.3
Rottnest Island 15.8 15.5 in 2015 32 14.3
Swanbourne 15.0 14.0 in 2015 30 12.7
Bickley 11.9 11.3 in 2015 29 9.9
Perth Metro 14.2 13.2 in 2013 29 11.8
Garden Island HSF 15.2 14.9 in 2013 21 13.7
Mandurah 15.3 14.8 in 2013 21 13.6


Record highest spring mean temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
spring
Perth Airport 20.2 19.2 in 2015 79 16.9
Pearce RAAF 20.5 19.4 in 2015 62 17.1
Jandakot Aero 19.7 18.4 in 2015 33 16.7
Rottnest Island 19.5 18.9 in 2015 32 17.6
Swanbourne 20.0 19.2 in 2015 30 17.6
Bickley 18.2 17.5 in 2015 29 15.6
Perth Metro 20.2 19.5 in 2015 29 17.6
Garden Island HSF 19.5 18.6 in 2015 21 17.5
Mandurah 19.8 19.1 in 2015 21 17.8


Extremes Maps Records Summaries Important notes the top

Summary statistics for spring 2023
Maximum temperatures
(°C)		 Minimum temperatures
(°C)		 Rainfall
(millimetres)
Mean for
spring
2023		 Diff
from
average		 Highest for
spring
2023		 Mean for
spring
2023		 Diff
from
average		 Lowest for
spring
2023		 Total for
spring
2023		 Average
for
spring		 Rank of
spring
2023		 Fraction of
spring
average
Bickley 24.4 +3.2 38.6 25 Nov 11.9 +2.0 2.8 7 Sep 139.2 229.7 v low 61%
Garden Island HSF 23.9 +2.7 39.7 23 Nov 15.2 +1.5 6.7 7 Sep 52.4 109.3 v low 48%
Jandakot Aero 26.3 +3.2 39.2 23 Nov 13.1 +2.8 4.1 7 Sep 79.8 157.9 v low 51%
Karnet 24.1 +3.1 37.0 25 Nov     2.9 7 Sep 111.0 249.6 v low 44%
Mandurah 24.4 +2.5 39.6 25 Nov 15.3 +1.7 6.3 7 Sep 32.8 113.8 lowest 29%
Millendon (Swan Valley) 27.4   40.2 25 Nov 13.1   5.5 4 Oct 97.2
Pearce RAAF 27.7 +4.0 40.3 25 Nov 13.4 +2.9 5.0 4 Oct 81.4 125.7 low 65%
Perth Airport 27.2 +4.2 39.8 23 Nov 13.2 +2.5 5.4 26 Sep 71.6 140.9 v low 51%
Perth Metro 26.3 +2.8 39.0 23 Nov 14.2 +2.4 5.2 7 Sep 56.8 147.0 lowest 39%
Rottnest Island 23.1 +2.3 38.4 23 Nov 15.8 +1.5 8.5 7 Sep 41.4 98.2 v low 42%
Swanbourne 25.0 +2.5 40.2 23 Nov 15.0 +2.3 5.8 7 Sep 64.8 144.0 v low 45%

Extremes Maps Records Summaries Important notes the top

Notes

The Seasonal climate summary, usually published in the first week of the following month, lists the main features of the weather in Greater Perth using the most timely and accurate information available on the date of publication; it will generally not be updated.

This summary includes data from observing sites in or near the Greater Perth “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to represent a socio-economic definition of each capital city. This means the greater capital city boundary includes people who regularly socialise, shop or work within the capital city, but live in the small towns and rural areas surrounding the capital city. It does not define the built up edge of the capital city.

This statement has been prepared based on information available at 12 pm on Friday 1 December 2023. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Information about Australian Indigenous seasonal calendars is available at the Indigenous Weather Knowledge website.

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