Perth in summer 2015-16: Average summer with record number of 40 °C days

Mean maximum temperatures were generally close to normal in the Perth metropolitan area, though some island and coastal plain sites recorded a warmer than normal summer, while mean minimum temperatures were close to average or above average. Summer rainfall was above average at most sites.

  • Near average or above average mean maximum temperatures
  • Near average or above average mean minimum temperatures
  • Record high number of days at or above 40 °C at Perth Metro

Rainfall in summer 2015-16 was mostly above average, with totals ranging from 20 mm to 60 mm on the coastal plain and offshore islands, to 90 mm in the hills. Perth Metro recorded a total of 29.4 mm on 14 rain days in summer 2015-16, which was close to the long-term average of 35.5 mm.

Mean maximum temperatures in summer 2015-16 were 0.5 °C to 1.0 °C warmer than normal for most islands and coastal plain sites, but slightly below average in the hills. Perth Metro recorded a mean maximum temperature of 31.2 °C, but despite being 0.5 °C higher than the summer average, it was the lowest summer mean maximum for seven years, since summer 2008-09. This summer, Perth Metro recorded a total of seven days with temperatures 40 °C or higher, which is the highest number of days at or above 40 °C in summer on record at Perth Metro, exceeding the previous record of 6 days in summer 1997-98. The coolest day this summer was on 5 December, with daily maxima in the mid-to-high teens, and Gasnells City recorded its equal coldest summer day on record.

Mean minimum temperatures in summer 2015-16 were near average to above average with several sites recording mean minima for summer at 0.5 °C to 1.0 °C above normal. Perth Metro recorded a mean minimum temperature of 17.8°C, which is close to the summer average.

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Extremes in summer 2015-16
Hottest day 45.1 °C at Pearce RAAF on 10 Feb 2016
Warmest days on average 33.2 °C at Pearce RAAF
Coolest days on average 27.1 °C at Rottnest Island
29.3 °C at Karnet
Coldest day 16.3 °C at Bickley on 5 Dec 2015
Coldest night 6.2 °C at Karnet on 1 Feb 2016
Coolest nights on average 15.4 °C at Bickley
15.4 °C at Karnet
Warmest nights on average 18.8 °C at Rottnest Island
18.7 °C at Gosnells City
Warmest night 28.4 °C at Gosnells City on 8 Jan 2016
Warmest on average overall 25.1 °C at Pearce RAAF
Coolest on average overall 22.5 °C at Bickley
Wettest overall 92.4 mm at Chidlow
Driest overall 22.2 mm at Gosnells City
Wettest day 30.6 mm at Karnet on 6 Dec 2015
Strongest wind gust 87 km/h at Rottnest Island on 31 Jan 2016

Record lowest summer daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Gosnells City 19.4 on 5 Dec 2015 = 19.4 on 6 Dec 2007 25 32.3




Summary statistics for summer 2015-16
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
summer
2015-16
Diff
from
average
Highest for
summer
2015-16
Mean for
summer
2015-16
Diff
from
average
Lowest for
summer
2015-16
Total for
summer
2015-16
Average
for
summer
Rank of
summer
2015-16
Fraction of
summer
average
Bickley 29.5 -0.4 40.9 10 Feb 2016 15.4 +0.4 8.2 1 Feb 2016 86.8 50.3 high 173%
Garden Island HSF 27.8 +0.6 41.3 8 Feb 2016 18.6 0.0 13.3 8 Dec 2015 52.0 30.5 average 170%
Gosnells City 31.8 -0.5 42.8 8 Feb 2016 18.7 +0.8 9.8 1 Feb 2016 22.2 37.5 average 59%
Jandakot Aero 31.1 +0.4 42.4 7 Jan 2016 16.7 +0.5 6.5 1 Feb 2016 52.4 42.1 high 124%
Karnet 29.3 -0.5 40.5 9 Feb 2016 15.4 +0.5 6.2 1 Feb 2016 92.3 54.3 high 170%
Pearce RAAF 33.2 +0.8 45.1 10 Feb 2016 17.0 +0.6 8.1 8 Dec 2015 36.6 28.9 high 127%
Perth Airport 31.8 +0.9 43.0 7 Jan 2016 17.5 +1.0 7.1 1 Feb 2016 41.6 35.1 high 119%
Perth Metro 31.2 +0.5 42.5 8 Feb 2016 17.8 +0.1 9.9 1 Feb 2016 29.4 35.5 average 83%
Rottnest Island 27.1 +0.8 40.6 8 Feb 2016 18.8 0.0 10.8 5 Dec 2015 45.8 28.9 high 158%
Swanbourne 29.5 -0.1 42.8 8 Feb 2016 18.4 +0.6 11.6 6 Dec 2015 35.0 32.1 average 109%
Note: Observations for “Perth Metro” are taken from the current site at Mount Lawley (Bureau number 009225).
Comparisons are made against combined data from the current site (which opened in early 1993) and the previous site at Perth Regional Office (009034), which ran from 1876 to early 1992.

Notes

The Seasonal climate summary lists 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.

A climate summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 11 am on Tuesday 1 March 2016. 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.

Observations for “Perth Metro” are taken from the current site at Mount Lawley (Bureau number 009225).
Comparisons are made against combined data from the current site (which opened in early 1993) and the previous site at Perth Regional Office (009034), which ran from 1876 to early 1992.

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

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