Western Australia in winter 2020: a dry and very warm winter

Winter was record warm and very dry for Western Australia. Seasonal mean maximum temperatures were well above average for most of the state, with record high temperatures in the northwest and central parts. The statewide winter mean maximum temperature was the highest on record. Seasonal mean minimum temperatures were above average for the southern two-thirds of the state. Rainfall in winter 2020 was below average for most of WA though winter is typically dry in the north. The statewide rainfall was the eighth-driest winter on record, and driest since 2006.

Below average rainfall for most of WA

  • It was a very dry winter for Western Australia; the statewide rainfall was 46% below the seasonal average and the eighth-driest winter on record, driest since 2006.
  • Rainfall was below average for most of WA, though winter is typically dry in the north.
  • Above average rainfall in August lifted winter rainfall totals close to average along the south coast between Albany and Eyre.
  • Most of the South West Land Division (SWLD) received below average winter rainfall; it was the tenth-driest winter, and driest since 2014 for the SWLD as a whole.
  • Early in August, a cold front and associated low pressure system produced moderate daily rainfall in excess of 30 mm along the state's south coast between the 3rd and 6th, with heavier falls between 80 and 100 mm in and around Albany; several sites had their highest winter daily rainfall on record.
  • Eyre (roughly mid-point along the Eucla District coast) recorded 75 mm on 6 August, which almost doubled its previous wettest winter day record, and it also was the wettest day for 9 years since 17 March 2011 when 81.2 mm was recorded.

Well above average daytime temperatures for most of WA

  • It was a record warm winter for Western Australia; the statewide seasonal mean temperature was 1.60 °C above average, the highest on record.
  • Winter daytime temperatures were above average across the whole state, and very warm in the northwest and central parts; several sites had their warmest winter days on record.
  • The state's mean maximum temperature was 2.38 °C above average, which was the warmest winter on record.
  • Winter overnight temperatures were above average for the southern two-thirds of the state; the statewide winter mean minimum temperature was 0.81 °C above average.
  • The statewide year-to-date mean maximum and minimum temperatures were the second-highest and eighth-highest for the January–August period on record.
  • Record high winter temperatures were observed in the Kimberley and Pilbara in late August from the 21st; the extreme heat then expanded to the state's south and south-east covering the eastern SWLD, Goldfields and Southern Interiors from the 28th; some locations exceeded their previous winter record on multiple days.
  • West Roebuck (about 10km east of Broome Airport) recorded Australia's highest winter temperature of 41.2 °C on record on 23 August, a day after Yampi Sound (75 km northeast of Derby) recorded the country's first 40 °C ( 40.7 °C on 22 August) for 50 years (40.0 °C at Kulumburu Mission on 27 August 1970); along with 40.1 °C at West Roebuck on the 27th, the country experienced three 40 °C days in winter within a week.
  • Port Hedland Airport had 7 out of 9 days exceeding its previous winter record (36.8 °C) between the 23rd and 31st; the maximum temperature on the 29th (39.9 °C ) was 3.1 °C higher than the old record.
  • Marble Bar exceeded its winter record (38 °C) on 6 consecutive days between the 24th and 29th; Marble Bar had not recorded a single 38 °C in winter prior to 2017, with records going back to 1901.

Strong winds

  • During June, Cape Leeuwin recorded wind gusts in excess of 110 km/h on 4 occasions with the strongest gust being 117km/h (63 knots) on the 17th.
  • On 27 July, the passage of a cold front produced strong winds and some damage in the South West Land Division (SWLD). Strong northwesterly winds ahead of the front caused blowing dust through eastern parts of the SWLD. Both Gnowangerup and Manjimup recorded a 83 km/h (45 knot) wind gust, and Cape Leeuwin recorded a gust of 96 km/h (52 knot). Damage was reported in Busselton where a group of 6 units lost its tin roof.
  • On 9 August, a strong cold front produced severe winds gusts and a 50–70 cm storm surge along the west coast of WA, though impacts were minimal due to low tides. The highest wind gust was 109 km/h (59 kt) at Cape Naturaliste, as raised dust moved through Gascoyne, and the winds brought downed trees and caused minor roof damage in an area from Kalbarri to Albany, including Perth metropolitan area.

Further information

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Extremes in winter 2020
Hottest day41.2 °C at West Roebuck on 23 Aug
40.7 °C at Yampi Sound (Defence) on 22 Aug
40.1 °C at West Roebuck on 27 Aug
Warmest days on average 34.3 °C at Kalumburu
Coolest days on average 15.8 °C at Shannon
Coldest day 9.2 °C at Jacup on 3 Aug
Coldest night -3.5 °C at York on 12 Jul
Coolest nights on average 4.2 °C at York
Warmest nights on average 23.2 °C at Troughton Island
Warmest night 25.5 °C at Troughton Island on 17 Jun
Warmest on average overall 26.4 °C at Troughton Island
25.3 °C at Truscott
Coolest on average overall 11.1 °C at Wandering
Wettest overall 535.6 mm at North Walpole
Wettest day 103.6 mm at Mettler on 4 Aug
Strongest wind gust 117 km/h at Cape Leeuwin on 17 Jun

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
Eyre 75.0 on 6 Aug 37.8 on 30 Jul 1994* 69
Tamar 102.6 on 4 Aug 90.4 on 20 Jul 1991 60
Mettler 103.6 on 4 Aug 78.4 on 26 Aug 1993 54
Windrush 93.0 on 4 Aug 63.0 on 19 Jul 1991 50
The Duke 75.0 on 4 Aug 60.0 on 24 Jul 1990 44
Munglinup 41.0 on 4 Aug 34.0 on 23 Jun 2015 31
Hill Plains 40.4 on 4 Aug 31.6 on 23 Jun 2019 26
Narrikup West 70.2 on 4 Aug 50.4 on 31 Jul 2015 25
Katanning 37.2 on 3 Aug 35.2 on 30 Aug 2014 22
Cheyne Beach 93.6 on 4 Aug 56.0 on 5 Jun 2005 20

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




Highest winter total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
winter
Pleasant Valley 276.8 313.0 in 1989* 212.2

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




Lowest winter total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
winter
Northam 115.8 115.0 in 1914* 221.2
Boscabel 147.0 139.1 in 1940* 244.2

* 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
Broome Airport 38.9 on 23 Aug 37.8 on 27 Aug 1995 82 29.5
Corrigin 29.5 on 30 Aug 29.0 on 29 Aug 2006 73 16.1
Port Hedland Airport 39.9 on 29 Aug 36.8 on 31 Aug 1962 73 28.1
Meekatharra Airport 33.4 on 28 Aug 32.6 on 29 Aug 1950 71 20.2
Giles Meteorological Office 34.0 on 26 Aug 33.2 on 24 Aug 1995 65 21.1
Mardie 39.0 on 29 Aug 38.1 on 17 Aug 1990 64 28.5
Bidyadanga 38.5 on 26 Aug 38.2 on 23 Aug 2017 62 30.3
Ravensthorpe 31.0 on 28 Aug 29.5 on 29 Aug 2006 59 17.0
Ongerup 27.5 on 28 Aug 27.1 on 29 Aug 2006 54 15.7
Brookton 26.8 on 28 Aug = 26.8 on 28 Aug 2019 53 16.7
Beverley 27.4 on 28 Aug = 27.4 on 29 Aug 2006 51 17.6
Telfer Aero 37.4 on 26 Aug 36.2 on 25 Aug 2017 47 26.4
Learmonth Airport 35.7 on 28 Aug 35.3 on 27 Aug 2017 46 25.2
Derby Aero 39.3 on 22 Aug 38.6 on 24 Aug 1998 36 31.4
Kununurra Aero 38.5 on 21 Aug 38.4 on 20 Aug 2010 35 31.3
Warburton Airfield 34.8 on 26 Aug 33.8 on 28 Aug 2012 33 21.6
Curtin Aero 39.1 on 23 Aug = 39.1 on 23 Aug 1995 29 31.7
Laverton Aero 33.6 on 28 Aug 31.8 on 29 Aug 2007 29 19.3
Jacup 29.6 on 28 Aug 28.6 on 29 Aug 2006 28 16.5
Karratha Aero 39.1 on 29 Aug 36.3 on 25 Aug 2017 28 27.1
Leinster Aero 33.7 on 28 Aug 32.3 on 29 Aug 2007 27 19.9
Mount Elizabeth 38.5 on 28 Aug 36.0 on 21 Aug 2013 26 29.2
Mount Magnet Aero 33.2 on 31 Aug 32.0 on 28 Aug 1995 26 20.0
Pardoo Station 38.3 on 29 Aug 36.9 on 23 Aug 1995 26 28.9
Newdegate Research Station 29.0 on 28 Aug 28.2 on 29 Aug 2006 25 16.1
Paraburdoo Aero 36.7 on 28 Aug 35.4 on 28 Aug 2017 25 25.9
Cunderdin Airfield 30.3 on 28 Aug 29.5 on 29 Aug 2006 24 17.9
Fitzroy Crossing Aero 39.5 on 23 Aug 39.0 on 25 Aug 1998 24 31.6
Hopetoun North 32.2 on 28 Aug 31.5 on 29 Aug 2006 24 18.6
Lake Grace 29.5 on 28 Aug 28.6 on 29 Aug 2006 24 16.5
Newman Aero 35.6 on 25 Aug 34.3 on 31 Aug 2010 24 24.1
Southern Cross Airfield 31.1 on 28 Aug 31.0 on 30 Aug 2006 24 17.7
Barrow Island Airport 33.0 on 30 Aug 31.1 on 31 Aug 2006 22 24.4
Katanning 24.7 on 28 Aug 24.4 on 16 Aug 2015 22 15.4
Marble Bar 38.9 on 24 Aug 38.0 on 25 Aug 2017 20 28.3
Roebourne Aero 39.5 on 29 Aug 38.7 on 25 Aug 2017 20 28.8



Record lowest winter daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Swanbourne 11.6 on 3 Aug 12.2 on 26 Jul 1998 27 18.9



Record highest winter mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Narrogin 17.0 = 17.0 in 2006 98 15.2
Dwellingup 17.1 = 17.1 in 2006 81 15.6
Perth Airport 20.0 = 20.0 in 2006 76 18.5
Port Hedland Airport 30.6 29.7 in 2015 71 28.1
Meekatharra Airport 23.4 22.5 in 1977 69 20.2
Mardie 30.6 30.5 in 1994 64 28.5
Pearce RAAF 19.9 19.8 in 2015 59 18.4
Mandora 31.6 = 31.6 in 2017 58 29.7
Ravensthorpe 18.5 18.3 in 2014 57 17.0
Onslow Airport 29.0 28.4 in 2017 54 26.3
Brookton 18.0 = 18.0 in 1977 52 16.7
Lancelin 21.1 = 21.1 in 1976 51 19.6
Telfer Aero 28.4 28.3 in 1996 46 26.4
Learmonth Airport 27.5 26.8 in 2017 45 25.2
Narembeen 18.9 = 18.9 in 1977 45 17.3
Wagin 17.3 = 17.3 in 2006 45 16.0
Carnegie 24.1 24.0 in 2002 30 22.3
Jandakot Aero 19.6 19.5 in 2015 29 18.6
Rottnest Island 18.9 = 18.9 in 2014 29 18.2
Laverton Aero 21.8 21.0 in 2002 28 19.3
Bickley 16.6 = 16.6 in 2006 26 15.8
Jacup 17.6 17.4 in 2014 26 16.5
Karratha Aero 28.7 28.2 in 2017 26 27.1
Perth Metro 19.9 = 19.9 in 2014 26 19.0
Leinster Aero 22.4 21.5 in 2002 25 19.9
Paraburdoo Aero 27.9 27.2 in 2017 24 25.9
Cunderdin Airfield 19.3 = 19.3 in 2006 23 17.9
Lake Grace 17.6 17.5 in 2006 23 16.5
Newman Aero 26.4 25.4 in 2017 23 24.1
Southern Cross Airfield 19.1 = 19.1 in 2006 23 17.7
Thevenard Island 26.9 26.2 in 2001 22 25.5
Barrow Island Airport 25.7 25.0 in 2015 20 24.4

Highest winter mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
winter
Badgingarra Research Stn 19.4 20.0 in 1994* 18.2
Gingin Aero 20.0 21.3 in 1996 19.0
Mount Elizabeth 30.7 30.8 in 1998* 29.2

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




Record highest winter daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Meekatharra Airport 20.1 on 28 Aug 18.8 on 31 Aug 2010 71 8.3
Rottnest Island 18.0 on 11 Jun = 18.0 on 3 Jun 2017 33 12.7
Gosnells City 17.9 on 6 Jun 17.3 on 13 Jun 2000 30 9.1
Norseman Aero 14.8 on 12 Jun 14.6 on 8 Aug 2013 21 4.4



Record highest winter mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Onslow Airport 15.6 15.5 in 2016 54 13.6
Badgingarra Research Stn 9.0 = 9.0 in 1992 51 7.6
Narembeen 7.1 = 7.1 in 2007 44 5.7
Bickley 8.4 = 8.4 in 2007 26 7.6
Swanbourne 11.3 11.1 in 2017 26 10.2

Highest winter mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
winter
Jandakot Aero 8.7 9.7 in 1991* 7.2
Carnarvon Airport 12.8 13.9 in 1996 11.6
Kalbarri 11.5 11.6 in 1996 10.2
Meekatharra Airport 9.9 10.0 in 1996 8.3
Perth Metro 9.5 9.7 in 1996 8.3
Pearce RAAF 9.6 =9.6 in 1999 8.6

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




Record highest winter mean temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Dwellingup 11.9 = 11.9 in 2015 81 10.7
Kalgoorlie-Boulder Airport 13.4 = 13.4 in 2007 78 11.7
Carnarvon Airport 19.1 = 19.1 in 1959 73 17.3
Meekatharra Airport 16.6 15.9 in 1977 69 14.2
Mardie 22.6 22.3 in 2010 63 20.6
Pearce RAAF 14.8 14.6 in 1983 59 13.5
Karnet 12.4 = 12.4 in 1983 54 11.3
Merredin 12.9 12.8 in 2014 54 11.5
Onslow Airport 22.3 21.7 in 2015 54 20.0
Badgingarra Research Stn 14.2 = 14.2 in 1977 49 12.9
Learmonth Airport 20.4 19.9 in 1996 45 18.7
Wagin 11.9 11.8 in 2014 44 10.9
Warburton Airfield 15.8 15.7 in 2015 44 14.1
Jandakot Aero 14.1 14.0 in 1991 29 12.9
Laverton Aero 14.7 14.2 in 1999 28 13.0
Murchison 15.9 15.8 in 2007 28 14.5
Bickley 12.5 12.4 in 2014 26 11.7
Jacup 12.0 = 12.0 in 2014 26 11.2
Karratha Aero 22.1 = 22.1 in 2010 26 20.7
Perth Metro 14.7 14.5 in 2015 26 13.6
Swanbourne 15.4 = 15.4 in 2014 26 14.5
Leinster Aero 15.1 14.5 in 2011 25 13.4
Newdegate Research Station 11.2 11.0 in 2015 24 10.3
Dalwallinu 13.3 13.2 in 2014 23 12.2
Lake Grace 11.8 = 11.8 in 2007 23 11.1
Newman Aero 17.5 16.6 in 2019 23 15.7
Bridgetown 11.4 = 11.4 in 2014 22 10.6
Hopetoun North 14.1 = 14.1 in 2011 22 13.3
Thevenard Island 22.8 22.3 in 2010 22 21.6
Shannon 11.7 = 11.7 in 2014 21 11.2
Barrow Island Airport 22.1 21.9 in 2010 20 21.2

Highest winter mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
winter
Perth Airport 14.6 14.8 in 1983 13.4
Northam 12.7 13.1 in 1983* 11.7
Narrogin 11.6 11.8 in 1983* 10.4
Carnegie 15.7 16.0 in 1996 14.5
Gingin Aero 13.8 15.9 in 1996 12.9
Paraburdoo Aero 19.8 20.0 in 1996 18.3
Telfer Aero 20.8 21.2 in 1996 19.1

* 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 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
winter
2020
Diff
from
average
Highest for
winter
2020
Mean for
winter
2020
Diff
from
average
Lowest for
winter
2020
Total for
winter
2020
Average
for
winter
Rank of
winter
2020
Fraction of
winter
average
North Kimberley (district 01)
Doongan 31.2 +1.0 36.5 23 Aug 11.4 -0.1 4.8 29 Jul 0 5.7 lowest 0%
Kalumburu 34.3 +1.7 38.1 27 Aug 13.7 -0.6 5.7 31 Jul 0 4.0 lowest 0%
Mount Elizabeth 30.7 +1.5 38.5 28 Aug 8.1 -0.6 1.8 30 Jul 0 15.9 lowest 0%
Troughton Island 29.6 +0.8 32.6 31 Aug 23.2 +0.4 20.5 1 Aug 1.0 9.1 average 11%
Truscott 31.9 +1.0 36.1 27 Aug 18.8 0.0 14.2 6 Jun 0.4 4.9 average 8%
Wyndham Aero 33.8 +1.3 39.3 21 Aug 16.1 +0.3 9.6 15 Jul 0 5.6 lowest 0%
East Kimberley (district 02)
Argyle Aerodrome 32.1 +1.6 38.6 22 Aug 17.5 +1.0 11.6 14 Jul 0 5.3 lowest 0%
Halls Creek Airport 29.6   36.0 27 Aug 12.1   4.9 15 Jul 0
Kununurra Aero 32.7 +1.4 38.5 21 Aug 14.6 -0.8 8.8 15 Jul 0 4.6 lowest 0%
Warmun 31.8 +1.4 38.0 22 Aug     11.0 14 Jul 0 11.8 lowest 0%
West Kimberley (district 03)
Bidyadanga 31.9 +1.6 38.5 26 Aug 15.1 +0.3 10.0 31 Jul 1.8 29.7 low 6%
Broome Airport 31.0 +1.5 38.9 23 Aug 14.6 0.0 8.4 31 Jul 1.8 26.9 low 7%
Curtin Aero 32.6 +0.9 39.1 23 Aug 16.1 +0.2 8.8 3 Aug 0 16.8 lowest 0%
Cygnet Bay 29.4 +0.5 34.1 27 Aug 15.8 +0.4 11.0 30 Jul 0 30.7 lowest 0%
Derby Aero 32.7 +1.3 39.3 22 Aug 14.9 -0.5 9.5 30 Jul 0 16.8 lowest 0%
Fitzroy Crossing Aero 32.4 +0.8 39.5 23 Aug 12.7 -0.2 6.3 15 Jul 0 15.3 lowest 0%
Yampi Sound (Defence) 33.6   40.7 22 Aug 11.5   4.8 16 Jul 0.2
De Grey (district 04)
Bedout Island 26.2 +0.5 29.3 29 Aug 21.0 +0.8 17.5 20 Jul
Karratha Aero 28.7 +1.6 39.1 29 Aug 15.6 +1.2 11.6 28 Jul 66.2 53.1 high 125%
Legendre Island 26.2 +0.8 31.9 29 Aug 19.8 +1.1 16.9 18 Aug
Mandora 31.6 +1.9 38.8 31 Aug 12.7 -0.6 6.0 17 Jul 0 27.9 lowest 0%
Marble Bar 30.3 +2.0 38.9 24 Aug 13.3 +0.5 7.2 13 Jul 5.6 37.2 average 15%
Port Hedland Airport 30.6 +2.5 39.9 29 Aug 14.2 +0.9 8.8 28 Jul 3.6 38.2 low 9%
Fortescue (district 05)
Barrow Island Airport 25.7 +1.3 33.0 30 Aug 18.5 +0.5 14.5 28 Jul 17.2 52.2 low 33%
Karijini North 27.4   36.4 27 Aug     6.9 26 Jul 27.4
Learmonth Airport 27.5 +2.3 35.7 28 Aug 13.3 +1.1 8.3 27 Jul 15.2 76.0 v low 20%
Mardie 30.6 +2.1 39.0 29 Aug 14.6 +1.8 10.3 5 Aug 3.2 57.8 v low 6%
Onslow Airport 29.0 +2.7 37.2 29 Aug 15.6 +2.0 11.0 29 Jul 13.2 73.7 low 18%
Thevenard Island 26.9 +1.4 33.5 30 Aug 18.7 +0.9 13.7 8 Jun 9.6 57.5 v low 17%
West Gascoyne (district 06)
Carnarvon Airport 25.3 +2.3 32.5 3 Jul 12.8 +1.2 8.0 14 Aug 67.8 106.0 low 64%
Murchison 23.8 +1.9 32.0 27 Aug 8.0 +1.0 1.0 16 Jun 48.5 76.5 low 63%
Shark Bay Airport 24.9 +1.3 30.7 6 Jun 12.2 +1.1 6.7 15 Aug 90.2 95.0 average 95%
East Gascoyne (district 07)
Newman Aero 26.4 +2.3 35.6 25 Aug 8.6 +1.3 0.3 13 Jul 3.2 35.7 low 9%
Paraburdoo Aero 27.9 +2.0 36.7 28 Aug 11.6 +0.9 5.9 18 Aug 8.8 46.3 low 19%
Murchison (district 07A)
Meekatharra Airport 23.4 +3.2 33.4 28 Aug 9.9 +1.6 4.0 18 Jul 19.8 60.7 low 33%
Paynes Find 21.2 +1.8 31.9 28 Aug 6.9 +0.9 -1.2 11 Jul 68.6 101.5 low 68%
North Coast (district 08)
Dalwallinu 19.4 +1.5 29.0 28 Aug 7.2 +0.8 1.6 11 Jul 121.6 122.9 average 99%
Geraldton Airport 22.2   30.9 5 Jun 10.6   4.8 24 Jul 178.6
Kalbarri 24.1 +1.7 30.2 5 Jun 11.5 +1.3 5.4 24 Jul 204.6 195.1 average 105%
Morawa Airport 21.2 +1.5 29.3 27 Aug 7.6 +0.9 2.6 30 Aug 101.6 119.4 average 85%
Mullewa 21.6 +1.9 29.5 27 Aug 8.8 +1.2 4.3 18 Jul 154.9 164.6 average 94%
North Island 22.6 +0.9 27.1 5 Jun 16.4 +0.7 10.1 14 Aug 130.2 163.5 average 80%
Wongan Hills 19.2 +1.4 27.9 28 Aug 7.5 +0.5 1.6 10 Jul 136.2 190.6 low 71%
Central Coast (district 09)
Badgingarra Research Stn 19.4 +1.2 28.1 5 Jun 9.0 +1.4 4.7 18 Jul
Bickley 16.6 +0.8 23.2 27 Aug 8.4 +0.8 3.8 20 Jun 499.2 589.4 low 85%
Garden Island HSF 19.0 +0.7 24.6 5 Jun 12.1 +0.6 7.9 21 Jun
Gingin Aero 20.0 +1.0 26.8 4 Jun 7.7 +1.0 0.6 10 Jul
Jandakot Aero 19.6 +1.0 24.6 9 Jun 8.7 +1.5 2.4 31 Aug 303.0 452.0 v low 67%
Karnet 17.1 +1.1 23.6 27 Aug 7.6 +1.0 2.8 19 Aug 478.8 607.5 low 79%
Lancelin 21.1 +1.5 28.3 4 Jun 10.7 +0.5 4.5 7 Aug 227.6 328.2 low 69%
Millendon (Swan Valley) 19.9   26.3 27 Aug 8.9   3.3 25 Jun 278.8
Pearce RAAF 19.9 +1.5 26.1 27 Aug 9.6 +1.0 3.0 2 Aug 268.4 368.5 low 73%
Perth Airport 20.0 +1.5 26.5 27 Aug 9.2 +0.8 3.6 2 Jul 274.0 428.0 v low 64%
Perth Metro 19.9 +0.9 25.5 4 Jun 9.5 +1.2 3.4 20 Jun 291.6 394.0 low 74%
Rottnest Island 18.9 +0.7 22.9 9 Jun 13.3 +0.6 8.9 18 Jul 229.2 302.9 low 76%
Swanbourne 19.5 +0.6 24.9 5 Jun 11.3 +1.1 6.1 20 Jun 257.2 391.0 v low 66%
South Coast (district 09A)
Albany 17.6 +1.3 26.2 28 Aug 9.8 +1.2 4.6 12 Jul 432.5 400.5 average 108%
Albany Airport 17.6   25.9 28 Aug 8.2   0.0 12 Jul 379.2
Bridgetown 16.9 +0.6 22.5 7 Jun 5.9 +1.0 -1.1 11 Jul 362.4 358.2 average 101%
Bunbury 18.4 +0.6 22.6 5 Jun 8.2 +0.6 0.1 12 Jul 346.8 395.0 low 88%
Busselton Aero 17.8 +0.5 22.2 5 Jun 7.7 +0.5 1.3 10 Jul 280.4 367.1 low 76%
Cape Leeuwin 18.0 +1.2 21.3 7 Jun 12.3 +0.7 6.7 11 Jul 293.6 488.5 v low 60%
Cape Naturaliste 18.4 +1.7 22.2 9 Jun 11.4 +0.7 5.9 4 Aug 286.0 432.1 v low 66%
Collie East 17.8 +0.9 23.4 28 Aug 5.2 +0.9 -2.3 12 Jul 312.8 356.4 average 88%
Donnybrook 18.5 +1.4 23.5 6 Jun       425.2 521.2 low 82%
Dwellingup 17.1 +1.5 23.1 27 Aug 6.7 +0.9 0.4 20 Jun 476.2 661.6 low 72%
Esperance 18.9 +1.2 29.6 28 Aug 9.6 +0.9 3.8 21 Jun 308.6 259.0 high 119%
Esperance Aero 17.9 +0.8 26.5 28 Aug 8.4 +0.5 3.2 8 Aug 212.2 215.0 average 99%
Hopetoun North 19.4 +0.8 32.2 28 Aug 8.8 +0.8 0.8 12 Jul 185.0 172.0 average 108%
Jarrahwood 17.9 +1.0 23.0 6 Jun 5.8 +0.6 -1.2 21 Jun 388.6 483.5 low 80%
Mandurah 18.7 +0.6 24.1 5 Jun 11.7 +0.6 6.9 11 Jul 252.8 333.5 v low 76%
North Walpole 17.1 +0.6 23.6 7 Jun 9.5 +0.2 3.8 11 Jul 535.6 500.2 high 107%
Rocky Gully 16.0 +0.7 23.1 28 Aug 7.5 +0.5 2.4 11 Jul 308.2 291.7 average 106%
Shannon 15.8 +0.5 22.3 7 Jun 7.6 +0.6 2.1 11 Jul 440.0 476.0 average 92%
Windy Harbour 17.7 +0.5 22.3 7 Jun 9.6 +0.6 1.0 11 Jul 420.3 528.7 v low 79%
Witchcliffe 17.2 +0.3 21.6 3 Jun 9.1 +0.7 0.9 11 Jul
North Central (district 10)
Bencubbin 18.5 +1.3 27.8 28 Aug 7.3 +0.9 1.4 11 Jul 96.5 130.5 low 74%
Cunderdin Airfield 19.3 +1.4 30.3 28 Aug 5.7 +0.6 -1.1 11 Jul 83.2 126.5 v low 66%
Merredin 18.6 +1.5 29.0 28 Aug 7.2 +1.3 0.5 10 Jul 126.1 138.3 average 91%
Northam 19.4 +1.7 27.5 28 Aug 5.9 +0.1 -1.5 12 Jul 115.8 221.2 v low 52%
York 18.9 +1.0 26.7 28 Aug 4.2 +0.1 -3.5 12 Jul 150.4 187.9 low 80%
South Central (district 10A)
Beverley 18.9 +1.3 27.4 28 Aug 5.7 +0.3 -1.8 12 Jul 132.2 212.3 v low 62%
Brookton 18.0 +1.3 26.8 28 Aug 5.4 +0.5 -0.5 12 Jul 130.7 231.1 v low 57%
Jacup 17.6 +1.1 29.6 28 Aug 6.3 +0.4 0.1 30 Aug 146.6 144.4 average 102%
Katanning 16.1 +0.7 24.7 28 Aug 6.8 +0.6 1.3 30 Aug 192.8 182.5 high 106%
Lake Grace 17.6 +1.1 29.5 28 Aug 6.0 +0.2 -0.1 11 Jul 70.2 105.3 low 67%
Narembeen 18.9 +1.6 29.8 28 Aug 7.1 +1.4 0.8 10 Jul 96.7 142.1 low 68%
Narrogin 17.0 +1.8 26.0 28 Aug 6.2 +0.6 -0.2 20 Jun 137.0 238.4 v low 57%
Newdegate Research Station 17.2 +1.1 29.0 28 Aug 5.1 +0.6 -2.0 30 Aug 91.2 141.3 v low 65%
Ravensthorpe 18.5 +1.5 31.0 28 Aug     1.8 4 Aug 130.6 135.3 average 97%
Wagin 17.3 +1.3 26.1 28 Aug 6.4 +0.5 -0.6 11 Jul 105.2 197.4 v low 53%
Wandering 17.1 +0.7 25.2 28 Aug 5.0 +0.8 -1.4 20 Jun 190.6 267.8 v low 71%
Eucla (district 11)
Balladonia     27.8 28 Aug 5.9 +0.6 -0.7 22 Jun 25.4 67.2 v low 38%
Eucla 19.8 +1.1 28.0 31 Jul 8.2 +0.6 3.7 23 Jul 55.0 81.2 low 68%
Eyre 20.4 +1.4 30.4 31 Jul 5.9 -0.2 -3.4 4 Jul 119.8 104.1 average 115%
Forrest 20.8 +1.2 28.8 28 Aug 5.7 +0.1 0.0 23 Jul 15.6 42.0 low 37%
Red Rocks Point 19.8 +0.7 29.5 31 Jul 8.5 +0.3 1.3 10 Jun 3.4 102.2 v low 3%
South East (district 12)
Bulga Downs 22.1 +1.7 34.3 28 Aug 6.3 +0.6 -0.8 12 Jul 45.2 65.4 average 69%
Kalgoorlie-Boulder Airport 19.6 +1.9 31.9 28 Aug 7.2 +1.5 1.1 25 Jul 39.2 72.4 low 54%
Laverton Aero 21.8 +2.5 33.6 28 Aug 7.7 +1.0 0.2 11 Jul 12.2 39.6 v low 31%
Leinster Aero 22.4 +2.5 33.7 28 Aug 7.8 +0.8 1.1 11 Jul 11.4 40.2 v low 28%
Leonora Aero 21.9 +1.8 34.1 28 Aug 7.7 +0.9 -0.2 12 Jul 21.0 40.2 low 52%
Munglinup West 18.5 +1.0 31.1 28 Aug 7.3 +0.3 2.1 4 Aug 121.2 126.1 average 96%
Norseman Aero 19.3 +1.1 29.7 28 Aug 5.0 +0.6 -1.6 21 Jun 48.2 62.0 average 78%
Salmon Gums Res.Stn. 18.3 +1.5 29.3 28 Aug 5.4 +0.4 -3.2 21 Jun 99.2 108.9 average 91%
Southern Cross Airfield 19.1 +1.4 31.1 28 Aug 5.2 +1.2 -1.5 11 Jul 84.6 92.6 average 91%
North East (district 13)
Carnegie 24.1 +1.8 34.9 28 Aug 7.3 +0.5 0.8 13 Jul 8.2 33.3 average 25%
Giles Meteorological Office 23.0 +1.9 34.0 26 Aug 8.4 +0.5 1.4 12 Jul 24.0 38.1 average 63%
Telfer Aero 28.4 +2.0 37.4 26 Aug 13.2 +1.5 6.7 27 Jul 7.4 28.5 average 26%
Warburton Airfield 23.5 +1.9 34.8 26 Aug 8.2 +1.7 0.4 23 Jun 11.4 38.9 average 29%
Wiluna Aero 23.7   34.9 28 Aug 6.6   -0.9 16 Jun 6.8
Offshore Islands (district 200)
Adele Island 27.7   30.8 29 Aug 23.0   19.2 2 Jun

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 9 am on Tuesday 1 September 2020. 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

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