Wednesday, 7 February 2024 - Annual Climate Summary for Greater Perth - Product code IDCKGC51L0

Greater Perth in 2023

Rainfall

  • Annual rainfall was 15–40% below average across Greater Perth, with totals in the 350–650 mm range at most sites, and up to 900–1000 mm in the Perth Hills.
  • Perth Metro recorded an annual rainfall total of 596.4 mm in 2023, the driest year since 2019 (estimate 580.4 mm). The driest year on record is 2006 (466.8 mm).
  • Perth Metro registered 98 days in 2023 with daily rainfall at least 0.2 mm, which was 10 days less than its annual average (108 rain days).
  • June was the wettest month of 2023 at Perth Metro with a monthly rainfall total of 228.6 mm, which was the wettest June since 2005 (251 mm). The wettest day was on 5 June and Perth Metro recorded 71.2 mm, the highest daily rainfall in June for 37 years since 25 June 1986 (77 mm).

Temperature

  • Annual mean maximum temperatures were above 0.5–1 °C above average at most sites, to 1.5 °C at Pearce RAAF and 1.6 °C at Perth Airport.
  • The annual mean maximum temperature was 25.6 °C at Perth Metro, which was the warmest year since 2019 (equal-warmest on record with 2011 & 2012 with the mean 25.7 °C).
  • Perth Airport had its warmest year on record. The previous record was in 2019 (the mean maximum temperature of 26.1 °C).
  • Bickley recorded its all-time lowest maximum temperature on record on 5 June.
  • Pearce RAAF equalled its highest annual mean temperature on record., along with 2011.

Perth Metro

  • Total rainfall for Perth Metro was 596.4 mm, which is 82% of the long-term average of 730.8 mm.
  • The mean daily maximum temperature for Perth Metro was 25.6 °C, which is 0.8 °C above the long-term average of 24.8 °C.
  • The warmest day was 39.5 °C on 21 January, and the coolest day was on 5 June when the temperature reached 14.4 °C.
  • The mean daily minimum temperature for Perth Metro was 13.4 °C, which is 0.5 °C above the long-term average of 12.9 °C.
  • The coldest morning was 0.7 °C on 27 June, and the warmest morning was on 2 March when the minimum temperature was 23.9 °C.

Extremes Maps Records Summaries Important notes the top

Extremes in 2023
Hottest day 41.3 °C at Pearce RAAF on 21 Jan
Warmest days on average 26.8 °C at Pearce RAAF
Coolest days on average 22.8 °C at Rottnest Island
Coldest day 8.1 °C at Bickley on 6 Jun
Coldest night -0.9 °C at Jandakot Aero on 27 Jun
Coolest nights on average 11.7 °C at Bickley
Warmest nights on average 16.0 °C at Rottnest Island
Warmest night 27.6 °C at Pearce RAAF on 21 Jan
Warmest on average overall 19.9 °C at Pearce RAAF
Coolest on average overall 17.5 °C at Bickley
Wettest overall 1044.3 mm at Huntly
Wettest day 92.0 mm at Roleystone on 5 Jun
Strongest wind gust 128 km/h at Rottnest Island on 2 Aug
128 km/h at Rottnest Island on 13 Sep

Extremes Maps Records Summaries Important notes the top

Record lowest daily maximum temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Bickley 8.1 on 6 Jun 9.0 on 16 Jun 2005 30 22.6


Record highest annual mean daily maximum temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Perth Airport 26.2 26.1 in 2019 79 24.6


Record highest annual mean temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Pearce RAAF 19.9 = 19.9 in 2011 60 18.8


Extremes Maps Records Summaries Important notes the top

Summary statistics for 2023
Maximum temperatures
(°C)		 Minimum temperatures
(°C)		 Rainfall
(millimetres)
Mean
for
2023		 Diff
from
average		 Highest
for
2023		 Mean
for
2023		 Diff
from
average		 Lowest
for
2023		 Total
for
2023		 Average
annual
total		 Rank
of
2023		 Fraction
of annual
average
Bickley 23.3 +0.7 38.6 25 Nov 11.7 +0.4 1.9 26 Jun 901.8 1081.4 low 83%
Garden Island HSF 23.4 +0.7 39.7 23 Nov 15.1 +0.1 4.7 16 Jul 508.4 612.5 low 83%
Jandakot Aero 25.5 +0.8 39.6 21 Jan 12.6 +1.0 -0.9 27 Jun 595.4 812.1 v low 73%
Mandurah 23.9 +0.5 39.6 25 Nov 15.0 +0.2 5.5 4 Aug 430.2 634.8 v low 68%
Millendon (Swan Valley) 26.4   40.2 25 Nov 12.5   -0.5 27 Jun 477.8
Pearce RAAF 26.8 +1.5 41.3 21 Jan 12.9 +0.6 0.0 27 Jun 420.0 651.2 v low 64%
Perth Airport 26.2 +1.6 40.7 21 Jan 12.9 +0.7 -0.6 27 Jun 554.4 757.2 v low 73%
Perth Metro 25.6 +0.8 39.5 21 Jan 13.4 +0.5 0.7 27 Jun 596.4 730.8 v low 82%
Rottnest Island 22.8 +0.5 38.4 23 Nov 16.0 +0.2 7.5 26 Jun 351.0 562.6 v low 62%
Swanbourne 24.4 +0.3 40.2 23 Nov 14.5 +0.5 4.5 26 Jun 618.6 735.3 low 84%

Extremes Maps Records Summaries Important notes the top

Notes

The Annual climate summary, 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 3 pm on Wednesday 7 February 2024. 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.

Creative Commons By Attribution logo Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence

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