Western Australia in winter 2017: Record warm days; a dry winter

Days in winter 2017 were uniformly warmer than normal across Western Australia, and the state-wide averaged mean maximum temperature was 2 °C above average, ranking as the warmest winter on record. Overnight temperatures were mixed however, with warmer than normal nights in most of the South West Land Division and central WA, whilst cooler than normal nights were recorded in the western Eucla and southern Kimberley. The mean minimum temperature for WA as a whole was above average. It was dry winter through much of WA, and averaged across the State it was WA's 11th-driest winter on record.

Below average rainfall for WA

  • Winter rainfall was 11th-lowest for WA from comparable records back to 1900, and the lowest since 2014
  • The South West Land Division (SWLD) also recorded below average rainfall for winter, its driest since 2014
  • Most sites in the Kimberley and Pilbara recorded little or no rainfall; Port Hedland received its equal lowest winter rainfall in 75 years of record
  • A slow moving cut-off low produced 70 mm to 130 mm of rainfall in the northwest Great Southern district on 22 and 23 June; a few sites had their record high winter daily rainfall

Above average daytime temperatures across WA

  • Mean maximum temperature for WA was 2 °C above average and the warmest winter on record, which was 0.4 °C higher than the previous record in winter 2002
  • Daytime temperatures were 2 °C to 3 °C warmer than normal in northern and eastern parts; a number of sites either had their warmest winter days on record or warmest for 21 years
  • Persistent easterly winds across northern WA in late August produced some record high winter temperatures in the Pilbara and west Kimberley between 23 and 28 August
  • The temperature reached 39.6 °C at Mandora on 24 August, which was the equal third-highest winter temperature on record in WA, and a WA early season record
  • Temperatures reached the mid-20s along the southwest coast on 27 August, resulting in winter records at a few sites in the South West district
  • A very cold day in southwest WA on 1 July set cold winter daytime records with maximum temperatures below 10 °C in the Great Southern
  • A record low winter maximum of 7.3 °C at Rocky Gully on 9 August was WA's lowest maximum temperature for 27 years, since 7.0 °C at Mount Barker on 23 July 1990
  • Mean minimum temperature for WA was 0.3 °C above average, but the lowest for three years
  • Mean minimum temperature for the SWLD was also 0.3 °C above average
  • Very cold nights with sub-zero temperatures occurred in western and central WA in July, with a few low temperature records set between the 5th and 10th
  • Record mild winter nights were reported at Rottnest Island in June, and Eyre in August

Further information

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Extremes in winter 2017
Hottest day 39.6 °C at Mandora on 24 Aug
Warmest days on average 33.8 °C at Kalumburu
Coolest days on average 15.2 °C at Shannon
Coldest day 7.3 °C at Rocky Gully on 9 Aug
Coldest night -5.0 °C at Eyre on 7 Jun
-5.0 °C at Eyre on 12 Aug
Coolest nights on average 4.4 °C at Southern Cross Airfield
Warmest nights on average 25.6 °C at Browse Island
Warmest night 26.7 °C at Browse Island on 5 Jun
26.7 °C at Browse Island on 7 Jun
Warmest on average overall 27.1 °C at Browse Island
26.0 °C at Truscott
Coolest on average overall 10.7 °C at Newdegate Research Station
Wettest overall 733.5 mm at Huntly
Driest overall 0 mm at Argyle Aerodrome and others
Wettest day 132.6 mm at Wilgarra on 23 Jun
Strongest wind gust 113 km/h at Busselton Jetty on 11 Aug

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window


Record highest winter daily rainfall
New record
(mm)
Old
record
Years of
record
Wandering 130.8 on 23 Jun 85.3 on 5 Jun 1952 115*
Marradong 77.6 on 23 Jun 77.2 on 25 Jul 1939 110
Caernarvon Park 81.0 on 22 Jun 45.4 on 29 Aug 1998 42

* note: Years of Records are combined from Wandering Comparision and Wandering




Highest winter total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
winter
Tamar 428.8 450.8 in 1978* 286.8
Bannister 385.6 491.0 in 1996 344.6

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




Record lowest winter total rainfall
New record
(mm)
Old
record
Years of
record
Average for
winter
Port Hedland Airport 0.6 = 0.6 in 1976 75 38.8

Lowest winter total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
winter
Paraburdoo Aero 3.2 2.4 in 1977* 47.8

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




Record highest winter temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Wittenoom 35.3 on 27 Aug 34.5 on 29 Aug 2007 65 25.3
Cape Naturaliste 24.3 on 13 Jun 23.3 on 31 Aug 1970 61 16.7
Bidyadanga 38.2 on 23 Aug 38.0 on 31 Aug 2007 59 30.2
Mandora 39.6 on 24 Aug 38.3 on 30 Aug 2007 56 29.6
Onslow Airport 37.7 on 27 Aug 35.2 on 18 Aug 2012 53 26.2
Telfer Aero 36.2 on 25 Aug 36.0 on 28 Aug 2012 44 26.4
Learmonth Airport 35.3 on 27 Aug 34.5 on 29 Aug 1995 43 25.1
Karratha Aero 36.3 on 25 Aug 35.4 on 27 Aug 1998 25 27.0
Bunbury 24.6 on 27 Aug 24.0 on 15 Aug 2015 22 17.8
Paraburdoo Aero 35.4 on 28 Aug 34.9 on 29 Aug 2007 22 25.8
Busselton Aero 23.8 on 27 Aug 23.6 on 3 Jun 2012 20 17.3



Record lowest winter daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Newdegate Research Station 9.2 on 1 Jul 9.5 on 11 Jul 2011 22 16.1
Rocky Gully 7.3 on 9 Aug 7.9 on 27 Aug 2004 22 15.2
Lake Grace 9.0 on 1 Jul 9.6 on 11 Jul 2011 21 16.4



Record highest winter mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Port Hedland Airport 29.7 = 29.7 in 2015 68 28.0
Wittenoom 27.5 26.9 in 2002 62 25.3
Giles Meteorological Office 23.2 22.7 in 2002 60 21.0
Mandora 31.6 31.3 in 2015 55 29.6
Onslow Airport 28.4 28.1 in 2014 51 26.2
Learmonth Airport 26.8 26.6 in 2012 42 25.1
Derby Aero 32.8 = 32.8 in 2016 32 31.3
Karratha Aero 28.2 28.0 in 2015 23 27.0
Paraburdoo Aero 27.2 27.1 in 2002 21 25.8
Newman Aero 25.4 25.2 in 2002 20 24.0

Highest winter mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
winter
Broome Airport 31.0 31.3 in 1988 29.5
Telfer Aero 28.1 28.3 in 1996 26.4



Record highest winter daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Eyre 19.2 on 9 Aug 18.5 on 24 Jul 1988 32 6.1
Rottnest Island 18.0 on 3 Jun = 18.0 on 26 Aug 1994 30 12.7



Record lowest winter temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Giles Meteorological Office -2.5 on 8 Jul -1.6 on 23 Jun 1981 62 7.9
Learmonth Airport 3.5 on 10 Jul 3.8 on 19 Jul 1986 43 12.3
Laverton Aero -3.3 on 5 Jul -2.6 on 28 Jul 1998 26 6.7



Record highest winter mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Wagin 7.1 = 7.1 in 1991 41 5.9

Highest winter mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
winter
Jandakot Aero 8.6 8.7 in 1996 7.1



Record highest winter mean temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
York 11.8 = 11.8 in 2011 20 10.9

Highest winter mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
winter
Jandakot Aero 13.9 14.0 in 1991* 12.8
Wittenoom 20.2 20.7 in 1996 18.9

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




Summary statistics for winter 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
winter
2017
Diff
from
average
Highest for
winter
2017
Mean for
winter
2017
Diff
from
average
Lowest for
winter
2017
Total for
winter
2017
Average
for
winter
Rank of
winter
2017
Fraction of
winter
average
North Kimberley (district 01)
Kalumburu 33.8 +1.4 37.9 20 Aug 15.4 +1.1 8.3 14 Jun 0.2 4.6 low 4%
Troughton Island 29.7 +1.0 32.2 26 Aug 23.7 +1.0 21.4 5 Aug 0.4 10.0 average 4%
Truscott 31.9 +1.1 35.6 20 Aug 20.0 +1.3 16.2 9 Jun 0 5.9 v low 0%
Wyndham Aero 33.7 +1.3 38.3 21 Aug 16.2 +0.4 9.5 14 Jun 0.4 6.1 average 7%
East Kimberley (district 02)
Argyle Aerodrome 31.6 +1.2 37.0 18 Aug 16.9 +0.5 11.2 11 Jun 0 5.8 lowest 0%
Halls Creek Airport 29.6   36.0 22 Aug 11.6   3.6 4 Aug 0
Kununurra Aero 32.6 +1.4 37.5 24 Aug 15.1 -0.4 8.7 4 Aug 0 5.0 lowest 0%
Warmun 31.4 +1.0 37.6 18 Aug 13.9 +0.1 7.3 5 Aug 0 12.1 lowest 0%
West Kimberley (district 03)
Broome Airport 31.0 +1.5 37.5 23 Aug 14.5 -0.1 7.6 5 Aug 1.0 27.9 low 4%
Curtin Aero 32.3 +0.7 37.9 19 Aug 16.2 +0.2 9.7 3 Aug 0 19.0 lowest 0%
Cygnet Bay 29.1 +0.2 34.9 19 Aug     7.5 13 Jun 0 32.4 lowest 0%
Derby Aero 32.8 +1.5 38.3 22 Aug 14.8 -0.7 7.4 4 Aug 0 17.7 lowest 0%
Fitzroy Crossing Aero 32.8 +1.3 38.9 24 Aug 12.7 -0.2 5.8 3 Aug 0.2 17.7 average 1%
De Grey (district 04)
Bedout Island 26.1   29.4 31 Aug 20.6   16.8 2 Aug
Karratha Aero 28.2 +1.2 36.3 25 Aug 14.4 0.0 8.3 11 Jul 0.4 53.1 v low 1%
Legendre Island 25.9   31.9 25 Aug 19.0   14.3 4 Aug
Mandora 31.6 +2.0 39.6 24 Aug 12.7 -0.6 3.7 3 Aug 0 28.7 lowest 0%
Marble Bar 29.8 +1.7 38.0 25 Aug 12.8 -0.1 5.4 11 Jul 0.4 41.4 v low 1%
Port Hedland Airport 29.7 +1.7 36.4 25 Aug 13.6 +0.3 5.6 11 Jul 0.6 38.8 lowest 2%
Roebourne Aero 30.0 +1.3 38.7 25 Aug 12.2 -0.6 4.1 11 Jul 0 44.5 v low 0%
Fortescue (district 05)
Barrow Island Airport 24.9 +0.5 30.1 24 Aug 18.2 +0.2 12.2 3 Aug 25.2 54.8 average 46%
Learmonth Airport 26.8 +1.7 35.3 27 Aug 11.5 -0.8 3.5 10 Jul 11.4 76.3 v low 15%
Onslow Airport 28.4 +2.2 37.7 27 Aug 14.2 +0.6 7.8 9 Jul 2.8 74.3 v low 4%
Wittenoom 27.5 +2.2 35.3 27 Aug 12.8 +0.3 5.0 10 Jul 0 50.8 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 23.9 +0.9 30.4 27 Jul 10.7 -0.9 3.4 3 Aug 16.7 106.8 v low 16%
Denham 22.2 -0.2 28.5 18 Jun 13.1 -0.2 9.0 30 Jun 42.2 115.5 v low 37%
Shark Bay Airport 23.7 +0.1 30.3 2 Jun 10.4 -0.8 4.8 30 Jun 40.4 92.3 low 44%
East Gascoyne (district 07)
Newman Aero 25.4 +1.4 33.3 27 Aug 7.4 +0.2 -0.5 10 Jul 0.6 36.4 v low 2%
Paraburdoo Aero 27.2 +1.4 35.4 28 Aug 10.5 -0.2 2.0 3 Aug 3.2 47.8 v low 7%
Murchison (district 07A)
Meekatharra Airport 21.9 +1.8 29.8 27 Aug 8.3 0.0 1.5 3 Aug 21.0 62.0 low 34%
Mount Magnet Aero 21.2 +1.2 30.7 1 Jun 7.7 -0.1 0.8 3 Aug 39.8 66.1 low 60%
Paynes Find 20.9 +1.6 30.2 1 Jun 5.4 -0.6 -1.4 28 Jun 53.2 102.1 low 52%
North Coast (district 08)
Dalwallinu 18.9 +1.0 27.0 1 Jun 6.6 +0.2 1.7 9 Jun 102.0 117.0 average 87%
Geraldton Airport 21.2   28.8 5 Jun 9.2   2.4 3 Aug
Kalbarri 23.1 +0.7 28.9 6 Jun     1.9 30 Jun 105.3 195.3 v low 54%
Morawa Airport 21.0 +1.4 28.1 1 Jun 6.8 +0.1 0.2 27 Jun 76.2 114.4 low 67%
Mullewa 21.1 +1.4 28.5 1 Jun 8.2 +0.6 1.2 3 Aug 135.4 164.9 average 82%
North Island 21.9 +0.2 26.8 5 Jun 15.6 -0.1 5.5 18 Aug 124.8 166.2 low 75%
Wongan Hills 18.6 +0.9 26.8 1 Jun 7.2 +0.2 1.0 3 Aug 125.0 190.5 low 66%
Central Coast (district 09)
Badgingarra Research Stn 19.1 +0.9 26.5 5 Jun 8.1 +0.5 1.6 3 Aug 252.6 290.5 average 87%
Bickley 16.0 +0.3 22.0 28 Aug 8.2 +0.6 3.4 1 Aug 599.8 585.5 average 102%
Garden Island HSF 18.7 +0.4 24.4 27 Aug 12.1 +0.6 4.8 3 Aug 321.4 313.7 average 102%
Gingin Aero 19.6 +0.6 26.5 5 Jun 7.2 +0.5 -0.6 2 Aug
Gosnells City 19.7 +0.4 26.1 5 Jun     3.4 1 Aug 410.2 451.2 average 91%
Jandakot Aero 19.2 +0.6 25.2 28 Aug 8.6 +1.5 0.7 2 Aug 413.8 453.5 average 91%
Lancelin 20.5 +0.9 27.3 27 Aug 10.7 +0.5 5.0 26 Jun 319.6 328.8 average 97%
Medina Research Centre 19.9 +1.0 26.7 5 Jun 9.3 +0.8 1.2 2 Aug 392.9 397.8 average 99%
Millendon (Swan Valley) 19.5   25.4 13 Jun 8.5   1.4 2 Aug 347.8
Pearce RAAF 19.7 +1.3 26.4 5 Jun 8.9 +0.3 1.5 26 Jun 338.8 368.3 average 92%
Perth Airport 19.5 +1.0 25.3 5 Jun 9.1 +0.8 1.0 2 Aug 379.4 429.7 average 88%
Perth Metro 19.5 +0.6 25.6 5 Jun 9.2 +1.0 1.7 2 Aug 412.2 474.2 low 87%
Rottnest Island 18.7 +0.6 23.5 6 Jun 13.2 +0.5 8.2 1 Aug   302.3    
Swanbourne 19.2 +0.3 25.4 5 Jun 11.0 +0.9 5.1 2 Aug 387.0 389.3 average 99%
South Coast (district 09A)
Albany 17.2 +1.0 23.9 12 Jun     5.2 29 Jun 378.7 400.6 average 95%
Albany Airport 17.0   23.2 13 Jun 7.7   0.3 12 Jun 339.8
Bridgetown 16.4 +0.1 22.1 29 Aug 5.2 +0.3 -2.3 29 Jun 417.6 350.9 high 119%
Bunbury 18.4 +0.6 24.6 27 Aug 7.8 +0.3 -0.3 2 Jul 400.8 394.1 average 102%
Busselton Aero 17.6 +0.3 23.8 27 Aug 7.7 +0.5 1.1 9 Jul 406.8 372.7 average 109%
Cape Leeuwin 17.5 +0.8 22.8 6 Jun 12.4 +0.8 8.3 10 Aug 478.4 491.2 average 97%
Cape Naturaliste 18.0 +1.3 24.3 13 Jun 11.2 +0.5 6.5 2 Jul 349.0 434.7 low 80%
Collie East 17.0 +0.1 22.9 29 Aug 4.8 +0.5 -2.2 29 Jun 406.0 353.8 high 115%
Donnybrook 17.8 +0.7 23.9 27 Aug 6.6 +0.4 0.0 6 Jul 463.8 522.3 average 89%
Dwellingup 16.4 +0.8 22.4 27 Aug 6.6 +0.8 -0.5 2 Aug 671.2 664.9 average 101%
Esperance 18.4 +0.7 27.6 1 Jun 8.7 0.0 3.6 30 Jun 238.2 257.5 average 93%
Esperance Aero 18.1 +1.1 26.6 1 Jun 7.5 -0.4 2.9 30 Jun 157.4 214.3 low 73%
Hopetoun North 18.8 +0.2 27.3 1 Jun 8.2 +0.3 2.3 31 Jul 148.8 172.8 low 86%
Jarrahwood 17.4 +0.6 24.0 29 Aug 5.2 0.0 -1.0 12 Jun 524.4 484.7 average 108%
Mandurah 18.4 +0.3 25.7 27 Aug 11.7 +0.7 5.7 2 Aug 323.8 331.5 low 98%
Manjimup 15.8 +0.9 22.3 27 Aug 7.3 +0.5 2.0 9 Jul 377.0 479.6 low 79%
North Walpole 16.4 -0.1 22.1 12 Jun 9.5 +0.2 5.4 4 Jul
Rocky Gully 15.5 +0.3 21.9 13 Jun 6.9 -0.1 2.1 6 Jul 333.2 289.7 high 115%
Shannon 15.2 -0.1 21.2 28 Aug 7.2 +0.2 1.5 29 Jun 436.0 469.0 average 93%
Witchcliffe 16.9 0.0 21.6 6 Jun 8.7 +0.4 3.0 24 Aug 576.8 523.2 average 110%
North Central (district 10)
Bencubbin 18.2 +1.0 27.2 1 Jun 6.6 +0.2 1.5 6 Jul 76.2 130.8 v low 58%
Cunderdin Airfield 18.8 +1.0 26.1 1 Jun 5.4 +0.4 -1.4 7 Jun 110.2 125.8 low 88%
Merredin 18.5 +1.5 27.3 1 Jun 6.1 +0.2 -1.0 6 Jul 89.1 138.1 low 65%
Northam 18.8 +1.2 26.2 13 Jun 5.9 +0.1 -0.6 30 Jun 168.5 222.1 low 76%
York 18.7 +0.9 25.7 5 Jun 4.9 +0.9 -2.5 29 Jun 173.5 184.8 average 94%
South Central (district 10A)
Beverley 18.4 +0.9 24.8 1 Jun 5.8 +0.4 -0.6 29 Jun 174.0 213.0 low 82%
Brookton 17.5 +0.8 24.4 1 Jun 5.0 +0.1 -1.0 6 Jul 189.0 232.4 low 81%
Corrigin 17.3 +1.2 24.9 1 Jun 5.2 0.0 -0.8 9 Jun
Hyden 18.2 +1.1 27.7 1 Jun 5.1 +0.1 -0.5 7 Jun 132.1 137.1 average 96%
Jacup 16.9 +0.5 26.0 1 Jun 5.9 0.0 0.9 10 Jul 162.0 145.3 high 111%
Katanning 15.9 +0.5 21.9 1 Jun 6.4 +0.2 2.0 6 Jul 132.0 180.8 v low 73%
Lake Grace 16.9 +0.5 25.2 1 Jun 6.2 +0.4 1.0 6 Jul 124.8 106.0 average 118%
Narembeen     27.2 1 Jun 6.0 +0.3 0.0 29 Jun 133.2 142.4 average 94%
Narrogin 16.3 +1.1 22.6 1 Jun 5.6 0.0 0.0 3 Jul 225.9 239.1 average 94%
Newdegate Research Station 16.9 +0.8 26.8 1 Jun 4.5 0.0 -2.1 10 Jul 119.2 142.6 low 84%
Ongerup 16.4 +0.8 23.9 2 Jun 6.2 +0.1 1.5 10 Jul 133.2 141.3 average 94%
Pingelly 17.1 +1.1 23.4 1 Jun     -2.0 4 Jul 212.2 224.5 average 95%
Ravensthorpe 17.7 +0.7 27.0 1 Jun 7.2 +0.1 1.5 29 Jun 138.1 135.6 average 102%
Wagin 16.4 +0.4 22.5 2 Jun 7.1 +1.2 1.7 10 Aug 162.4 198.0 average 82%
Wandering 16.7 +0.3 22.4 2 Jun 5.1 +0.9 -1.8 9 Jun 411.0 261.9 v high 157%
Eucla (district 11)
Eucla 20.1 +1.5 30.3 28 Jul 7.2 -0.4 1.5 8 Jul 56.8 81.4 low 70%
Eyre 20.6 +1.7 30.7 8 Aug 4.9 -1.2 -5.0 7 Jun 63.5 104.7 low 61%
Forrest 20.6 +1.0 30.1 28 Jul 5.2 -0.4 -1.8 3 Jun 24.6 43.9 average 56%
Red Rocks Point 19.8 +0.8 31.6 28 Jul 7.9 -0.3 1.9 11 Aug 49.4 110.4 v low 45%
South East (district 12)
Bulga Downs 21.0 +0.6 29.4 28 Aug 4.8 -1.0 -4.0 5 Jul 30.2 66.0 low 46%
Kalgoorlie-Boulder Airport 19.1 +1.4 27.5 1 Jun 6.9 +1.3 -0.6 5 Jul 28.8 73.2 v low 39%
Laverton Aero 20.4 +1.2 28.2 26 Jul 6.2 -0.5 -3.3 5 Jul 30.6 42.0 average 73%
Leinster Aero 20.8 +1.0 27.6 8 Aug 6.7 -0.3 -1.1 7 Jul 16.0 43.2 low 37%
Leonora Aero 20.5 +0.6 27.8 7 Aug 6.2 -0.8 -2.0 5 Jul 34.6 44.2 average 78%
Munglinup West 18.0 +0.6 26.5 1 Jun 6.8 -0.3 1.7 31 Jul 130.2 126.2 average 103%
Norseman Aero 19.0 +0.9 28.2 1 Jun 4.9 +0.5 -2.1 18 Aug 42.6 63.0 low 68%
Salmon Gums Res.Stn. 18.1 +1.3 27.4 1 Jun 4.7 -0.3 -3.8 18 Aug 75.6 109.0 low 69%
Southern Cross Airfield 18.4 +0.7 28.6 1 Jun 4.4 +0.5 -2.3 30 Jun 70.4 91.6 average 77%
Yeelirrie 21.5 +1.2 28.4 7 Aug 5.0 +0.7 -2.2 5 Jul 16.0 52.1 low 31%
North East (district 13)
Giles Meteorological Office 23.2 +2.2 32.0 14 Aug 8.2 +0.3 -2.5 8 Jul 12.8 39.5 average 32%
Telfer Aero 28.1 +1.7 36.2 25 Aug 12.1 +0.4 5.1 8 Jul 0 30.2 lowest 0%
Warburton Airfield 23.2 +1.7 33.0 14 Aug 7.0 +0.5 -2.3 7 Jul 25.8 40.5 average 64%
Wiluna 22.4 +2.0 30.0 30 Aug 7.3 +1.0 -1.0 9 Jul 16.5 48.6 low 34%
Offshore Islands (district 200)
Browse Island 28.5   29.8 28 Aug 25.6   24.3 3 Aug
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.
From 2017 on, information about Cocos and Christmas Islands can be found in the climate summary for the Remote Islands and Antarctica

Notes

The Seasonal climate summary, generally published on the first working day of each month, lists the main features of the weather in Western Australia 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 11 am on Friday 1 September 2017. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

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.

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

Further information

Media
(03) 9669 4057
Enquiries