Perth in spring 2015: Record warm spring days

Record warm spring days were reported for most coastal plain and hills sites in Perth, and very much warmer than normal overnight temperatures were recorded across the metropolitan area. Spring rainfall was below to very much below average across Perth.

  • Warmest spring days on record for most sites
  • Very much warmer than normal spring nights across Perth
  • Driest spring for five years at Perth Metro

Rainfall in spring 2015 in the Perth area was below to very much below the long-term average, with totals ranging from 50 mm to 120 mm on the coastal plain and offshore islands, to 160 mm in the hills. Perth Metro recorded a total of 93.0 mm on 19 rain days, which was well below the long-term average of 155.6 mm, and its driest spring since 2010.

Mean maximum temperatures in spring 2015 were generally 2 °C to 4 °C above average across the Perth metropolitan area, and Perth Metro and a number of other sites experienced their warmest spring on record. Perth Metro recorded a total of 22 days with maximum temperatures at or above 30 °C during spring 2015, which easily broke the previous record of 16 days in spring 2010.

Mean minimum temperatures in spring 2015 were about 1 °C above average across the Perth metropolitan area, and sites near the coast and in the hills recorded their highest spring mean daily minimum temperature on record. An unusually warm morning on 22 November 2015 saw Rottnest Island record its equal highest spring minimum temperature in 48 years of record, equal with a minimum of 22.2 °C on 22 November 1978.

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Extremes in spring 2015
Hottest day 40.7 °C at Pearce RAAF on 14 Nov
Warmest days on average 27.3 °C at Pearce RAAF
Coolest days on average 22.3 °C at Rottnest Island
23.7 °C at Bickley
23.7 °C at Karnet
Coldest day 12.2 °C at Bickley on 1 Sep
Coldest night 0.4 °C at Jandakot Aero on 2 Sep
Coolest nights on average 10.4 °C at Karnet
Warmest nights on average 15.5 °C at Rottnest Island
14.0 °C at Swanbourne
Warmest night 24.1 °C at Pearce RAAF on 22 Nov
Warmest on average overall 19.5 °C at Perth Metro
Coolest on average overall 17.1 °C at Karnet
Wettest overall 184.8 mm at Jarrahdale
Driest overall 55.8 mm at Pearce RAAF
Wettest day 40.2 mm at Jarrahdale on 31 Oct
Strongest wind gust 81 km/h at Rottnest Island on 10 Sep

Record highest spring mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Perth Airport 26.2 25.8 in 2010 71 22.9
Pearce RAAF 27.3 25.9 in 2010 54 23.5
Karnet 23.7 23.4 in 2010 47 20.9
Bickley 23.7 23.1 in 2010 21 21.2
Perth Metro 25.9 25.3 in 2010 117 23.4
Gosnells City 26.5 26.2 in 2010 20 24.2



Record highest spring daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Rottnest Island 22.2 on 22 Nov 22.2 on 22 Nov 1978 48 14.3



Record highest spring mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Karnet 10.4 = 10.4 in 2013 47 9.2
Rottnest Island 15.5 15.3 in 2013 117 14.3
Swanbourne 14.0 13.8 in 2013 22 12.7
Bickley 11.3 10.9 in 2013 21 9.9
Gosnells City 13.6 13.3 in 2013 20 12.2



Record highest spring mean temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Perth Airport 19.2 18.5 in 2013 71 16.8
Pearce RAAF 19.4 18.7 in 2013 54 17.0
Karnet 17.1 16.5 in 2010 47 15.1
Jandakot Aero 18.4 18.1 in 2013 25 16.6
Rottnest Island 18.9 18.6 in 2013 117 17.5
Swanbourne 19.2 18.9 in 2013 22 17.6
Bickley 17.5 16.7 in 2010 21 15.5
Perth Metro 19.5 18.8 in 2013 117 17.6



Summary statistics for spring 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
spring
2015
Diff
from
average
Highest for
spring
2015
Mean for
spring
2015
Diff
from
average
Lowest for
spring
2015
Total for
spring
2015
Average
for
spring
Rank of
spring
2015
Fraction of
spring
average
Bickley 23.7 +2.5 36.6 14 Nov 11.3 +1.4 2.8 2 Sep 152.2 233.5 low 65%
Garden Island HSF 22.4 +1.2 36.6 14 Nov 14.8 +1.0 7.0 2 Sep 78.8 119.2 v low 66%
Gosnells City 26.5 +2.3 39.0 14 Nov 13.6 +1.4 4.4 2 Sep   157.4    
Jandakot Aero 25.4 +2.4 38.8 14 Nov 11.3 +1.1 0.4 2 Sep 101.4 163.7 low 62%
Karnet 23.7 +2.8 35.8 14 Nov 10.4 +1.2 1.4 2 Sep 145.8 259.2 v low 56%
Pearce RAAF 27.3 +3.8 40.7 14 Nov 11.5 +1.0 2.8 2 Sep 55.8 128.3 v low 43%
Perth Airport 26.2 +3.3 39.2 14 Nov 12.2 +1.6 1.7 2 Sep 82.4 143.4 v low 57%
Perth Metro 25.9 +2.5 39.4 14 Nov 13.0 +1.2 2.8 2 Sep 93.0 155.6 low 60%
Rottnest Island 22.3 +1.5 36.1 14 Nov 15.5 +1.2 8.8 2 Sep 79.4 113.7 low 70%
Swanbourne 24.3 +1.8 37.4 14 Nov 14.0 +1.3 4.8 2 Sep 115.6 151.6 low 76%
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
Observations for “Rottnest Island” are taken from the current site at Rottnest Island (Bureau number 009193).
Comparisons are made against combined data from the current site(which opened in 1995) and the previous site at Rottnest Island Lighthouse (009038),which ran from 1879 to 1994.

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 12 pm on Tuesday 1 December 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.

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

Media
(03) 9669 4057
Enquiries

Climate

Service notice

Network problems on 8 January disrupted processing of observations, affecting some climate information. Missing data are being retrieved and will be processed into our systems over coming weeks.