Perth in spring 2016: Mostly cool to mild spring days and nights

Spring mean maximum and minimum temperatures were below average across Perth largely due to very cool daytime and overnight temperatures in September and October. Rainfall was near average to below average for most sites.

Near average to below average spring rainfall

  • Spring rainfall totals were between 100 mm to 150 mm for coastal plain sites, and from 180 mm to 230 mm in the Perth hills
  • Perth Metro recorded 120.6 mm in spring 2016, over 30 mm below the long-term spring average
  • Twenty-four rain days in spring at Perth Metro was below the long-term average of 30 rain days, largely due to a dry November

Below average spring maximum and minimum temperatures

  • Mean maximum temperatures were close to 1 °C cooler than normal for many sites
  • Perth Metro spring mean maximum of 22.7 °C was the coolest for eight years, since 22.7 °C was also recorded in spring 2008
  • Mean minimum temperatures were 1 °C to 1.5 °C below average for most sites
  • Perth Airport and Pearce RAAF had their coolest spring mean minimum temperature for 42 years, since 1974;
  • A couple of sites with less than 30 years of record had their lowest spring mean daily minimum temperature on record
  • Perth Metro's spring mean minimum of 10.6 °C was the coolest for 11 years,since 10.4 °C was recorded on spring 2005

Further information

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Extremes in spring 2016
Hottest day 39.9 °C at Pearce RAAF on 26 Nov
Warmest days on average 23.6 °C at Pearce RAAF
Coolest days on average 19.7 °C at Garden Island HSF
20.1 °C at Karnet
Coldest day 11.6 °C at Karnet on 23 Sep
Coldest night 0.6 °C at Karnet on 24 Sep
Coolest nights on average 8.0 °C at Karnet
Warmest nights on average 13.5 °C at Rottnest Island
11.9 °C at Swanbourne
Warmest night 22.0 °C at Swanbourne on 15 Nov
Warmest on average overall 16.7 °C at Rottnest Island
16.6 °C at Gosnells City
Coolest on average overall 14.0 °C at Karnet
Wettest overall 226.6 mm at Jarrahdale
Driest overall 102.0 mm at Rottnest Island
102.2 mm at Pearce RAAF
Wettest day 31.8 mm at Armadale on 27 Sep
Strongest wind gust 107 km/h at Garden Island HSF on 7 Sep

Record lowest spring temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Gosnells City 2.0 on 15 Sep 2.6 on 10 Sep 2004 24 12.2



Record lowest spring mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Medina Research Centre 9.7 9.8 in 1987 29 11.0
Gosnells City 10.0 10.9 in 2005 21 12.2

Lowest spring mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
spring
Pearce RAAF 8.9 8.5 in 1974 10.5
Perth Airport 9.5 9.1 in 1974 10.6




Summary statistics for spring 2016
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
spring
2016
Diff
from
average
Highest for
spring
2016
Mean for
spring
2016
Diff
from
average
Lowest for
spring
2016
Total for
spring
2016
Average
for
spring
Rank of
spring
2016
Fraction of
spring
average
Bickley 20.3 -1.0 35.1 26 Nov 9.0 -1.0 2.1 29 Sep 183.4 232.4 low 79%
Garden Island HSF 19.7 -1.6 34.2 26 Nov 12.6 -1.2 6.8 18 Sep 127.8 119.7 average 107%
Gosnells City 23.4 -0.9 37.8 26 Nov 10.0 -2.2 2.0 15 Sep
Jandakot Aero 22.3 -0.8 37.9 26 Nov 9.0 -1.2 1.7 18 Sep 141.0 163.1 average 86%
Karnet 20.1 -0.9 35.0 15 Nov 8.0 -1.3 0.6 24 Sep 224.7 258.3 average 87%
Medina Research Centre 22.6 -0.5 39.0 26 Nov 9.7 -1.3 3.0 18 Sep 152.1 148.8 average 102%
Pearce RAAF 23.6 0.0 39.9 26 Nov 8.9 -1.6 2.2 1 Sep 102.2 127.8 average 80%
Perth Airport 22.9 -0.1 38.2 26 Nov 9.5 -1.1 3.1 18 Sep 105.2 142.8 low 74%
Perth Metro 22.7 -0.8 38.2 26 Nov 10.6 -1.2 3.7 18 Sep 120.6 155.2 low 78%
Rottnest Island 20.0 -0.8 35.9 26 Nov 13.5 -0.8 8.0 19 Sep 102.0 103.7 average 98%
Swanbourne 21.4 -1.2 37.5 14 Nov 11.9 -0.8 5.9 29 Sep 138.6 151.0 average 92%
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, generally published on the first working day of each month, 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. 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 statement has been prepared based on information available at 9 am on Thursday 1 December 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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries