Perth in summer 2016-17: Record wet summer, mild temperatures

Across the Perth metropolitan area, rainfall in summer 2016-17 was three to five times higher than seasonal averages, with Perth Metro and several other sites recording their wettest summer on record. For most sites, summer 2016-17 was the mildest for 11 years; mean maximum and minimum temperatures were generally 1 °C cooler than normal.

Record wet summer

  • Summer rainfall totals across Perth were in the 110 mm-230 mm range; 3-5 times higher than the seasonal average
  • Heavy rainfall at the end of January and in early February had some sites reporting their wettest summer on record , and several sites had their highest summer rainfall for at least 26 years
  • Perth Metro recorded 192.8 mm in summer, which exceeded the previous record of 180.4 mm in summer 1954-55, from rainfall records going back to 1876
  • A cloudband associated with a tropical low to the north brought very heavy rainfall to southwest WA on 10 February with record high summer daily rainfall recorded in the Perth area; Perth Metro's 114.4 mm on the 10th was its second highest daily rainfall for any month behind 120.6 mm on 9 February 1992

Mild daytime and overnight temperatures

  • Mean maximum temperatures were generally 0.5 °C to 1.5 °C below seasonal averages; Perth Metro's mean maximum of 29.8 °C for summer was the mildest for 11 years, since summer 2005-06
  • Persistent rain and fresh southerly winds led to a cool to cold day across Perth on 9 February with daily maxima in the 13-18 °C range; several sites had their lowest daily maximum temperature in summer on record
  • Perth Metro recorded a daily maximum of 17.4 °C on 9 February, which was its second lowest maximum temperature in summer since daily temperature records commenced in 1897, only behind 14.9 °C on 17 December 1952
  • Mean minimum temperatures were 0.5-1.0 °C below seasonal averages; Perth Metro's mean minimum of 16.7 °C was the lowest for 11 years, since summer 2005-06

Further information

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Extremes in summer 2016-17
Hottest day 44.5 °C at Pearce RAAF on 4 Jan 2017
Warmest days on average 31.7 °C at Pearce RAAF
Coolest days on average 25.5 °C at Rottnest Island
27.8 °C at Swanbourne
Coldest day 13.7 °C at Bickley on 9 Feb 2017
Coldest night 7.1 °C at Karnet on 22 Feb 2017
Coolest nights on average 14.3 °C at Karnet
Warmest nights on average 18.1 °C at Rottnest Island
17.2 °C at Swanbourne
Warmest night 25.9 °C at Gosnells City on 25 Feb 2017
Warmest on average overall 23.5 °C at Pearce RAAF
Coolest on average overall 21.4 °C at Bickley
Wettest overall 237.2 mm at Gidgegannup
Driest overall 112.2 mm at Bungendore
Wettest day 124.0 mm at Hopelands on 10 Feb 2017
Strongest wind gust 89 km/h at Rottnest Island on 8 Feb 2017

Record highest summer daily rainfall
New record
(mm)
Old
record
Years of
record
Wanneroo 78.8 on 10 Feb 2017 66.4 on 21 Jan 1982 80
Pearce RAAF 58.0 on 10 Feb 2017 53.0 on 22 Feb 1986 66
Karnet 115.8 on 10 Feb 2017 106.8 on 21 Jan 1982 55
Bickley 83.6 on 10 Feb 2017 66.6 on 21 Feb 1986 49
Rottnest Island 93.8 on 10 Feb 2017 46.8 on 23 Jan 1999 25
Swanbourne 97.4 on 10 Feb 2017 79.0 on 22 Jan 2000 25



Record highest summer total rainfall
New record
(mm)
Old
record
Years of
record
Average for
summer
Perth Metro 192.8 180.4 in 1954 141 50.1
Wanneroo 177.2 147.0 in 1981 70 35.2
Gidgegannup 237.2 185.1 in 1989 57 40.5
Pearce RAAF 167.0 91.4 in 2011 51 31.6
Bickley 171.8 145.2 in 1999 46 52.9
Mount Helena 209.6 206.4 in 1989 31 50.0
Swanbourne 181.6 145.6 in 1999 23 38.6
Rottnest Island 117.6 90.2 in 2011 22 34.0

Highest summer total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
summer
Herne Hill 146.8 150.9 in 1914* 36.6
Chidlow 198.8 209.8 in 1954* 44.5
Jarrahdale 172.2 185.3 in 1954* 48.3
Serpentine 166.2 204.4 in 1954* 36.1
Karnet 181.6 187.8 in 1981* 56.4
Pickering Brook 161.0 174.0 in 1989 54.8
Medina Research Centre 132.1 274.7 in 1991 44.6
Midland 138.1 168.8 in 1991 34.0
Mundaring 178.4 209.4 in 1989* 49.1
Perth Airport 128.2 184.8 in 1991 36.4
Jandakot Aero 146.4 244.0 in 1991* 44.6

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported




Record lowest summer daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Pearce RAAF 17.5 on 9 Feb 2017 18.8 on 17 Feb 1981 60 32.4
Karnet 15.4 on 9 Feb 2017 15.5 on 25 Feb 1991 53 29.8
Medina Research Centre 18.2 on 9 Feb 2017 19.2 on 25 Feb 1991 32 30.3
Jandakot Aero 17.6 on 9 Feb 2017 19.3 on 25 Feb 1991 28 30.7
Rottnest Island 18.0 on 9 Feb 2017 18.4 on 6 Dec 2007 28 26.3
Gosnells City 18.0 on 9 Feb 2017 19.4 on 5 Dec 2015 26 32.2
Bickley 13.7 on 9 Feb 2017 16.0 on 16 Dec 2007 24 29.9
Swanbourne 17.1 on 9 Feb 2017 19.3 on 1 Dec 1998 24 29.5



Summary statistics for summer 2016-17
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
summer
2016-17
Diff
from
average
Highest for
summer
2016-17
Mean for
summer
2016-17
Diff
from
average
Lowest for
summer
2016-17
Total for
summer
2016-17
Average
for
summer
Rank of
summer
2016-17
Fraction of
summer
average
Bickley 28.4 -1.5 41.0 4 Jan 2017 14.4 -0.6 8.8 13 Jan 2017 171.8 52.9 highest 325%
Garden Island HSF 25.9 -1.3 40.9 21 Dec 2016 17.9 -0.7 13.5 8 Dec 2016 147.0 37.8 v high 389%
Gosnells City 30.9 -1.3 42.5 4 Jan 2017 17.2 -0.7 10.6 28 Dec 2016 114.6 38.9 v high 295%
Jandakot Aero 29.8 -0.9 43.3 21 Dec 2016 15.7 -0.5 7.8 22 Feb 2017 146.4 44.6 v high 328%
Karnet 28.7 -1.1 40.2 4 Jan 2017 14.3 -0.6 7.1 22 Feb 2017 181.6 56.4 v high 322%
Pearce RAAF 31.7 -0.7 44.5 4 Jan 2017 15.4 -1.0 8.5 28 Dec 2016 167.0 31.6 highest 528%
Perth Airport 30.5 -0.4 43.3 4 Jan 2017 16.1 -0.4 7.8 22 Feb 2017 128.2 36.4 v high 352%
Perth Metro 29.8 -1.0 42.4 21 Dec 2016 16.7 -1.0 10.1 22 Feb 2017 192.8 50.1 highest 385%
Rottnest Island 25.5 -0.8 39.8 21 Dec 2016 18.1 -0.7 14.2 8 Dec 2016 117.6 34.0 highest 346%
Swanbourne 27.8 -1.7 42.0 21 Dec 2016 17.2 -0.6 11.6 29 Dec 2016 181.6 38.6 highest 470%
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 10 am on Wednesday 1 March 2017. 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