Perth in autumn 2015: Cool autumn days and nights

  • Lowest day-time temperatures for seven years at Perth Metro
  • Lowest night-time temperature for six years at Perth Metro

Rainfall in autumn 2015 was near average for most sites in the Perth metropolitan area and generally ranged from 130 mm to 160 mm on the coastal plain and offshore islands, to 240 mm in the hills. Bickley recorded 241.4 mm of total autumn rainfall, which was the highest seasonal rainfall in the Perth area. Perth Metro recorded a total of 153.4 mm on 19 rain days, which was its driest autumn for three years, since autumn 2012 when 118.4 mm was recorded.

Mean maximum temperatures were near average to below average across Perth in autumn 2015. A daily maximum temperature of 41.5 °C at Pearce RAAF on 12 March was the highest temperature in the Perth metropolitan area in autumn, whilst the lowest maximum temperature for autumn 2015 was 12.5 °C at Bickley on 16 May. Perth Metro recorded a mean maximum of 25.4 °C, which is its lowest autumn mean maximum for seven years, since autumn 2008 when a mean maximum of 25.4 °C was recorded.

Mean minimum temperatures were slightly below average across the Perth metropolitan area in autumn 2015. The coldest night was either on 5 May or 28 May for coastal palin sites. Jandakot Aerodrome recorded the lowest temperature in the Perth area with minima of 1.5 °C on 28 May. The highest minimum temperature in Perth in autumn 2015 was 23.5 °C at Bickley on 13 March. Perth Metro recorded a mean minimum temperature of 13.1 °C this autumn, which was the lowest autumn mean minimum for six years, since autumn 2009 when a mean minimum of 12.7 °C was recorded.

Further information

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Extremes in autumn 2015
Hottest day 41.5 °C at Pearce RAAF on 12 Mar
Warmest days on average 26.3 °C at Pearce RAAF
Coolest days on average 22.5 °C at Bickley
Coldest day 12.5 °C at Bickley on 16 May
Coldest night 1.5 °C at Jandakot Aero on 28 May
Coolest nights on average 11.7 °C at Bickley
Warmest nights on average 16.5 °C at Rottnest Island
14.3 °C at Swanbourne
Warmest night 23.5 °C at Bickley on 13 Mar
Warmest on average overall 20.0 °C at Swanbourne
Coolest on average overall 17.1 °C at Bickley
Wettest overall 241.4 mm at Bickley
Driest overall 130.7 mm at Medina Research Centre
Wettest day 60.6 mm at Bickley on 18 May
60.6 mm at Karragullen North on 18 May
Strongest wind gust 111 km/h at Rottnest Island on 16 May




Summary statistics for autumn 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
autumn
2015
Diff
from
average
Highest for
autumn
2015
Mean for
autumn
2015
Diff
from
average
Lowest for
autumn
2015
Total for
autumn
2015
Average
for
autumn
Rank of
autumn
2015
Fraction of
autumn
average
Bickley 22.5 -1.2 36.5 12 Mar 11.7 -0.8 5.3 20 May 241.4 211.7 average 114%
Garden Island HSF 23.5 -0.7 33.7 13 Mar 15.5 -0.6 9.8 23 May 131.6 134.6 average 98%
Jandakot Aero 25.3 -0.5 36.4 12 Mar 11.9 -0.5 1.5 28 May 146.4 166.2 average 88%
Medina Research Centre 25.3 -0.4 35.2 13 Mar 13.0 -0.3 4.3 5 May 130.7 160.1 low 82%
Pearce RAAF 26.3 0.0 41.5 12 Mar 12.9 -0.5 1.7 5 May 139.8 134.8 average 104%
Perth Airport 25.7 0.0 38.6 12 Mar 12.8 -0.3 3.0 5 May 145.2 156.2 average 93%
Perth Metro 25.4 -0.6 37.9 12 Mar 13.1 -0.6 3.7 28 May 153.4 180.5 average 85%
Rottnest Island 23.1 -0.6 31.1 13 Mar 16.5 -0.6 10.0 4 May 141.6 148.1 average 96%
Swanbourne 25.6 0.0 37.2 12 Mar 14.3 -0.8 7.1 28 May 184.0 153.0 average 120%

Notes

A Seasonal Climate Summary is prepared to list the main features of the weather in Perth using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 10 am on Tuesday 2 June 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
(03) 9669 4057
Enquiries