Perth in summer 2014-15: Dry start and late summer

Rainfall in summer 2014-15 was near average for most sites in the Perth metropolitan area and ranged from 5 mm to 10 mm on the offshore islands to 20 mm to 60 mm on the coastal plain and in the hills. Midland recorded 58.6 mm of total summer rainfall, which was the highest summer rainfall in the Perth area. Perth Metro recorded a total of 42.0 mm, which was its wettest summer for three years, since summer 2011-12 when 118.2 mm was recorded. Perth Metro saw a long dry spell at the start of summer as 61 days without measurable rainfall were recorded from 29 November 2014 to 28 January, its equal ninth longest dry spell since records commenced in 1876. The dry spell was brought to an end as showers and thunderstorms moved over Perth from 29 January to 3 February. The wettest days of summer 2014-15 for most sites were 2 or 3 February, and Pickering Brook registered 24.4 mm on the 3rd, the highest daily fall in Perth for summer.

Mean maximum temperatures were above average at most sites in summer 2014-15. The hottest day was 5 January for most sites, with a daily maximum temperature of 45.4 °C at Pearce RAAF being the highest temperature in the Perth metropolitan area during summer. The lowest maximum temperature in Perth for summer 2014-15 was 19.9 °C at Garden Island on 16 December. Perth Metro recorded a mean maximum of 31.4 °C, and although above average, recorded its lowest summer mean maximum for six years, since summer 2008-09 when a mean maximum of 30.7 °C was recorded.

Mean minimum temperatures were close to average across the Perth metropolitan area in summer 2014-15. The coldest night for most sites was near the middle of December, and both Pearce RAAF and Bickley recorded the lowest temperature in the Perth area in summer with minima of 8.9 °C on 16 and 17 December respectively. The highest minimum temperature in Perth in summer 2014-15 was 27.5 °C at Gosnells City on 28 January. Perth Metro recorded a mean minimum temperature of 17.8 °C this summer, and although slightly above average was the lowest summer mean minimum for six years, since summer 2008-09 when a mean minimum of 17.4 °C was recorded.

  • Wettest summer for three years at Perth Metro
  • Lowest summer temperatures for six years at Perth Metro in terms of both mean maximum and minimum temperatures

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Extremes in summer 2014-15
Hottest day 45.4 °C at Pearce RAAF on 5 Jan 2015
Warmest days on average 33.8 °C at Pearce RAAF
Coolest days on average 26.6 °C at Rottnest Island
30.3 °C at Bickley
Coldest day 19.9 °C at Garden Island HSF on 16 Dec 2014
20.9 °C at Bickley on 15 Dec 2014
Coldest night 8.9 °C at Pearce RAAF on 16 Dec 2014
8.9 °C at Bickley on 17 Dec 2014
Coolest nights on average 15.3 °C at Bickley
Warmest nights on average 18.8 °C at Rottnest Island
18.0 °C at Gosnells City
Warmest night 27.5 °C at Gosnells City on 28 Jan 2015
Warmest on average overall 25.0 °C at Pearce RAAF
Coolest on average overall 22.7 °C at Rottnest Island
22.8 °C at Bickley
Wettest overall 58.6 mm at Midland
Wettest day 24.4 mm at Pickering Brook on 3 Feb 2015
Strongest wind gust 111 km/h at Rottnest Island on 2 Feb 2015




Summary statistics for summer 2014-15
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
summer
2014-15
Diff
from
average
Highest for
summer
2014-15
Mean for
summer
2014-15
Diff
from
average
Lowest for
summer
2014-15
Total for
summer
2014-15
Average
for
summer
Rank of
summer
2014-15
Fraction of
summer
average
Bickley 30.3 +0.4 41.3 5 Jan 2015 15.3 +0.3 8.9 17 Dec 2014 29.0 49.5 average 59%
Garden Island HSF 27.2 0.0 39.4 5 Jan 2015 18.6 0.0 13.5 2 Dec 2014 5.8 29.0 low 20%
Gosnells City 32.4 +0.1 43.8 5 Jan 2015 18.0 +0.1 11.4 9 Dec 2014       24%
Jandakot Aero 31.4 +0.7 43.7 5 Jan 2015 16.4 +0.2 9.1 16 Dec 2014 32.8 41.8 average 78%
Medina Research Centre 31.0 +0.8 44.1 5 Jan 2015 16.7 0.0 9.5 14 Dec 2014 19.1 41.8 average 46%
Pearce RAAF 33.8 +1.4 45.4 5 Jan 2015 16.3 -0.1 8.9 16 Dec 2014 33.8 27.7 average 122%
Perth Airport 32.2 +1.5 44.2 5 Jan 2015 17.1 +0.6 10.4 14 Dec 2014 27.4 35.0 average 78%
Perth Metro 31.4 +0.7 44.4 5 Jan 2015 17.8 0.0 11.6 14 Dec 2014 42.0 35.3 average 119%
Rottnest Island 26.6 +0.3 39.4 5 Jan 2015 18.8 0.0 13.8 10 Dec 2014 8.4 29.1 average 29%
Swanbourne 30.4 +0.9 43.2 5 Jan 2015 17.8 0.0 11.9 14 Dec 2014 21.8 32.0 average 68%

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 3 March 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