Greater Perth in winter 2019: record warm day in late winter; a wet start and finish

Rainfall in winter 2019 was above average in the Greater Perth, largely due to a wet June. Mean maximum temperatures were above average across Perth, and mean minimum temperatures were mostly near average. It was a record warm day on 28 August and the Perth city had the first 30 degree winter's day.

Near average rainfall

  • Winter rainfall was above average for most sites; seasonal totals were mostly in the 360-460 mm range, up to 570-680 mm in the Perth hills
  • Perth Metro recorded 434.8 mm in winter 2019, which was above average (396.4 mm), though drier than winter in 2018
  • The wettest day was on 23 June, with daily rainfall generally between 40 mm and 70 mm; the wettest spot was Bungedore in the Perth hills with 77.2 mm on 23 June
  • Perth Metro's daily rainfall 58 mm on 23 June was only its fourth occurrence with a daily fall of 50 mm in winter; previous such heavy falls were 63.8 mm on 4 August 1994, 88.8 mm on 30 July 2001 and 61.2 mm on 22 June 2017

Above average daytime temperatures

  • Mean maximum temperatures were above average across Greater Perth
  • Mean minimum temperatures were near average to above average
  • It was a record warm winter day across Perth on 28 August, many sites had exceeded their previous winter temperature records by 1 to 2 °C
  • A daily maximum temperature of 30.0 °C at Perth Metro (Mt Lawley) on 28 August was not only a winter record at the current site, but also the first 30 °C day in winter in the Perth city (previous city's highest winter temperature was 28.1 °C on 5 June 1975)
  • Perth Metro's mean maximum temperature was 19.8 °C, which was 0.8 °C above average, and mildest winter since 2015
  • Perth Metro's mean minimum temperature was 8.5°C, which was 0.3°C above average, though cooler than winters in 2018 and 2017
  • The coldest nights were on 19 June and 18 August with temperatures dipping below 2°C at Milledon (Swan Valley) and Perth Airport respectively

Perth Metro

  • Total rainfall for Perth Metro was 434.8 mm, which is 109% of the long-term average of 397.8 mm
  • The warmest day was 30.0 °C on 28 August, and the coolest day was on 5 July when the temperature reached 13.5 °C
  • The coldest morning was 2.1 °C on 19 June, and the warmest morning was on 25 June when the minimum temperature was 14.9 °C

Further information

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Extremes in winter 2019
Hottest day 30.2°C at Swanbourne on 28 August
Warmest days on average 19.8°C at Perth Metro
Coolest days on average 16.2°C at Bickley
Coldest day 10.4°C at Bickley on 5 July
Coldest night 1.3°C at Jandakot Aero on 24 August
Coolest nights on average 7.8°C at Bickley
Warmest nights on average 12.9°C at Rottnest Island
Warmest night 17.2°C at Rottnest Island on 22 June
Warmest on average overall 15.8°C at Rottnest Island
Coolest on average overall 12.0°C at Bickley
Wettest overall 681.0 mm at Bickley
Driest overall 371.2 mm at Mandurah
Wettest day 77.2 mm at Bungendore on 23 Junw
Strongest wind gust 107 km/h at Ocean Reef on 16 August

Record highest winter temperature

New record
(°C)
Old
record
Years of
record
Average for
winter
Perth Airport 29.9 on 28 Aug 28.3 on 26 Aug 1998 76 18.5
Karnet 27.0 on 28 Aug 25.3 on 5 Jun 1975 54 15.9
Jandakot Aero 29.4 on 28 Aug 27.0 on 15 Aug 2015 30 18.6
Bickley 26.6 on 28 Aug 24.7 on 25 Aug 1994 26 15.7
Perth Metro 30.0 on 28 Aug 27.2 on 26 Aug 1998 26 19.0
Swanbourne 30.2 on 28 Aug 28.0 on 15 Aug 2015 26 18.9



Summary statistics for winter 2019

Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
winter
2019
Diff
from
average
Highest for
winter
2019
Mean for
winter
2019
Diff
from
average
Lowest for
winter
2019
Total for
winter
2019
Average
for
winter
Rank of
winter
2019
Fraction of
winter
average
Bickley 16.2 +0.5 26.6 28 Aug 7.8 +0.2 3.5 18 Jun 681.0 591.2 high 115%
Garden Island HSF 18.9 +0.6 25.9 28 Aug 11.6 +0.1 7.1 18 Jun 389.0 322.1 high 121%
Jandakot Aero 19.4 +0.8 29.4 28 Aug 7.9 +0.7 1.3 24 Aug 469.6 455.3 average 103%
Mandurah 18.5 +0.4 23.9 28 Aug 11.1 0.0 7.1 18 Jun 371.2 338.5 average 110%
Millendon (Swan Valley) 19.5   28.5 28 Aug 8.1   1.8 19 Jun 382.0


Pearce RAAF 19.7 +1.3 29.0 28 Aug 8.9 +0.3 2.8 18 Aug 387.4 370.1 average 105%
Perth Airport 19.7 +1.2 29.9 28 Aug 8.4 0.0 1.9 18 Aug 381.6 429.9 average 89%
Perth Metro 19.8 +0.8 30.0 28 Aug 8.5 +0.3 2.1 19 Jun 434.8 397.8 average 109%
Rottnest Island 18.7 +0.6 24.1 12 Aug 12.9 +0.2 8.5 28 Jun 373.0 305.8 v high 122%
Swanbourne 19.4 +0.5 30.2 28 Aug 10.6 +0.5 4.6 19 Jun 468.2 396.1 high 118%

Notes

The Seasonal climate summary, generally published on the first working day of each 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. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

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 “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 7 pm on Sunday 1 September 2019. 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.

Further information

Media
(03) 9669 4057
Enquiries