Western Australia in summer 2020–21: wet and below average daytime temperature

Rainfall in summer was above average for north, east and along the west coast of Western Australia. Though tropical cyclone Joshua remained well offshore of WA coast, several well formed tropical lows produced widespread moderate to heavy rainfall along their passage. Seasonal mean maximum temperatures were above average along the north and west coasts of the state, in contrast to below average mean maxima over a large part of WA from the Southern Interior down and east of Albany. Mean minimum temperatures for summer were above average for the Pilbara, Gascoyne and western parts of the South west Land Division, while below average mean minima were confined in state's eastern interior.

Wet across north, east and west coast

  • Western Australia's summer rainfall was nearly 50% above average, and it was the wettest summer since 2017–18.
  • A number of well formed tropical lows resulted in above average summer rainfall in the state's north, east and along the west coast.
  • The Gascoyne region was particularly wet largely due to a very wet period in early February and Dairy Creek in the inland north Gascoyne had its wettest summer in 90 years of record.
  • During December, a number of tropical lows brought 3 to 4 times the December average rainfall to the state's north and east, including some record high December totals.
  • A tropical low (02U) crossed the Pilbara coast west of Port Headland on 11 December then tracked across the interior and southeast, producing widespread moderate to heavy rainfall up to 160 mm along its passage; Noreena Down in the east Pilbara recorded 150.6 mm on the 12th, which was its highest summer daily rainfall in 102 years of record.
  • A tropical low (03U) crossed the west Kimberley coast on 20 December and tracked south-east through the Kimberley to the Northern Territory; 5-day rainfall totals between the 20th and 24th were double their December average at sites in south-eastern parts of the Kimberley.
  • A tropical low (08U) crossed far west Kimberley coast on 22 January then tracked through east Pilbara, and state's interior and south-east, and produced moderate rainfall to the Kimberley.
  • A tropical low (12U) not only resulted in record wet February in the Gascoyne District, but also produced several highest summer daily rainfall on record along the west coast and south-west between the 6th and 8th as the low continued its southward journey.

Cooler days in the east and warmer nights in north-west

  • Western Australia's summer mean maximum temperature was 0.53 °C below average and the coolest since 2005–06, and mean minimum temperature was 0.04 °C above average; coolest since 2016–17 for both.
  • Very hot conditions were first observed along the Gascoyne coast on 21 December, expanding to the state's south and south-east till the 26th; many locations along the west coast experienced 3 to 4 consecutive days of 40 °C or above for a scorching Christmas Day and Boxing Day.
  • A severe to low-intensity heatwave occurred in the north-west between 12 and 15 January; several sites recorded daily maximum temperatures over 45 °C with 47.1 °C at Roebourne Aero on the 14th the highest for this summer in WA; minimum temperatures of 33.2 °C at Paraburdoo Aero and Telfer Aero on the 15th were the state's equal highest minima for this summer.
  • It was a very cool morning in the state's south-west, particularly around Perth on 1 December, with overnight temperatures dipping below 10 °C, Perth Metro and several other sites had their lowest summer temperature on record.

Further information

Media
(03) 9669 4057

Extremes in summer 2020-21
Hottest day 47.1 °C at Roebourne Aero on 14 Jan 2021
Warmest days on average 39.0 °C at Paraburdoo Aero
Coolest days on average 21.9 °C at Albany
Coldest day 16.2 °C at Shannon on 1 Dec 2020
Coldest night 1.4 °C at Eyre on 2 Dec 2020
Coolest nights on average 12.4 °C at Jacup
Warmest nights on average 27.6 °C at Bedout Island
Warmest night 32.0 °C at Warmun on 18 Dec 2020
32.0 °C at Paraburdoo Aero on 15 Jan 2021
32.0 °C at Telfer Aero on 15 Jan 2021
Warmest on average overall 32.1 °C at Paraburdoo Aero
32.1 °C at Roebourne Aero
Coolest on average overall 18.3 °C at Windy Harbour
Wettest overall 1150.0 mm at Mount Hart Station
Wettest day 260.0 mm at Myroodah on 31 Jan 2021
Strongest wind gust 135 km/h at Troughton Island on 15 Dec 2020

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 summer daily rainfall
New record
(mm)
Old
record
Years of
record
Noreena Downs 150.6 on 12 Dec 2020 135.0 on 16 Feb 2004 102
Frankland 40.5 on 8 Feb 2021 40.0 on 20 Jan 2016 51
Windy Harbour 66.8 on 8 Feb 2021 53.2 on 21 Dec 2008 36
Ludlow 43.4 on 7 Feb 2021 34.2 on 20 Jan 2016 27
Rocky Gully 56.6 on 8 Feb 2021 46.0 on 12 Dec 1996 26
Steep Point 88.0 on 6 Feb 2021 61.0 on 17 Dec 2010 26
Shannon 55.4 on 8 Feb 2021 42.6 on 21 Dec 2008 25
Witchcliffe 44.6 on 8 Feb 2021 43.8 on 23 Jan 2019 23
Port Denison 34.6 on 6 Feb 2021 29.2 on 12 Jan 2006 22
Jindong 43.8 on 8 Feb 2021 40.2 on 25 Jan 2006 20
Old Mornington Homestead 147.4 on 30 Jan 2021 119.0 on 30 Jan 2009 20



Record highest summer total rainfall
New record
(mm)
Old
record
Years of
record
Average for
summer
Gascoyne Junction 306.5 229.7 in 1922 104 56.7
Dairy Creek 224.3 200.5 in 1962 95 57.9
Billiluna 584.8 517.9 in 1973 23 271.8
Shannon 147.4 123.6 in 2010 22 70.3

Highest summer total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
summer
Cape Naturaliste 85.4 85.6 in 1988* 36.0
Emu Creek Station 289.5 478.8 in 1998* 127.5
Margaret River 100.2 105.8 in 1999* 48.2

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





Record highest summer daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Thevenard Island 30.9 on 11 Jan 2021 30.5 on 24 Feb 2013 25 25.1



Record lowest summer temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Wongan Hills 6.8 on 1 Dec 2020 7.3 on 2 Dec 1998 56 17.3
Brookton 3.0 on 1 Dec 2020 = 3.0 on 13 Dec 1984 55 15.0
Pingelly 4.5 on 1 Dec 2020 = 4.5 on 10 Dec 1984 51 15.2
Gosnells City 8.0 on 1 Dec 2020 = 8.0 on 2 Dec 2002 30 17.9
Perth Metro 6.6 on 1 Dec 2020 7.9 on 7 Dec 2007 28 17.6
Gingin Aero 2.2 on 1 Dec 2020 4.4 on 7 Dec 2007 25 15.9
Lake Grace 5.2 on 1 Dec 2020 6.0 on 1 Dec 2005 24 14.8



Summary statistics for summer 2020-21
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
summer
2020-21
Diff
from
average
Highest for
summer
2020-21
Mean for
summer
2020-21
Diff
from
average
Lowest for
summer
2020-21
Total for
summer
2020-21
Average
for
summer
Rank of
summer
2020-21
Fraction of
summer
average
North Kimberley (district 01)
Doongan 32.9 -0.6 38.2 12 Jan 2021 23.2 +0.3 20.0 1 Dec 2020 274.7 744.6 v low 37%
Kalumburu 34.0 -0.4 37.4 14 Jan 2021 24.6 -0.1 21.2 5 Jan 2021 779.8 861.0 average 91%
Mount Elizabeth 32.8 -0.4 38.5 4 Jan 2021     17.5 23 Dec 2020 749.4 670.1 average 112%
Troughton Island 31.9 -0.2 34.5 14 Jan 2021 26.7 0.0 22.7 16 Dec 2020 1037.2 588.4 high 176%
Truscott 32.3 -0.6 36.3 1 Dec 2020 25.3 -0.4 22.1 16 Dec 2020 948.4 749.3 high 127%
Wyndham Aero 36.0 -0.9 41.8 16 Dec 2020 26.2 -0.1 23.3 9 Dec 2020 528.6 569.7 average 93%
East Kimberley (district 02)
Argyle Aerodrome 36.3 -0.3 43.9 4 Jan 2021 25.9 +0.2 21.6 10 Feb 2021 629.4 478.0 high 132%
Halls Creek Airport 34.7   40.6 14 Jan 2021 23.6   18.9 22 Dec 2020 569.6
Kununurra Aero 35.2 -0.9 41.0 2 Jan 2021 25.0 -0.1 22.7 10 Feb 2021 658.2 573.3 high 115%
Warmun 36.2 -1.0 42.5 12 Jan 2021 25.3 +0.5 22.0 23 Dec 2020 559.3 477.2 high 117%
West Kimberley (district 03)
Bidyadanga     41.5 19 Jan 2021 25.5 -0.4 22.0 9 Jan 2021 482.4 320.6 high 150%
Broome Airport 33.8 +0.4 41.5 18 Jan 2021 26.9 +0.6 22.3 22 Feb 2021 341.8 433.5 average 79%
Curtin Aero 35.7 -1.1 41.6 13 Jan 2021 24.8 -0.1 20.9 25 Feb 2021 742.2 567.3 high 131%
Cygnet Bay 32.6 -1.3 36.4 9 Jan 2021 25.7 +0.2 23.2 25 Feb 2021 987.0 518.1 v high 191%
Derby Aero 35.0 -0.7 40.7 18 Jan 2021 25.8 0.0 21.8 25 Feb 2021 863.0 489.4 v high 176%
Fitzroy Crossing Aero 36.2 -1.8 42.7 13 Jan 2021 24.9 -0.4 20.4 22 Dec 2020 637.0 459.4 high 139%
Yampi Sound (Defence) 35.1   40.1 5 Dec 2020 25.1   20.7 26 Feb 2021
De Grey (district 04)
Bedout Island 33.5 0.0 36.7 20 Jan 2021 27.6 +0.3 23.9 22 Jan 2021
Karratha Aero 36.0 +0.1 43.8 19 Dec 2020 27.1 +0.7 20.6 11 Dec 2020 180.4 141.2 high 128%
Legendre Island 33.0 +0.1 38.7 9 Jan 2021 27.3 +0.8 20.9 11 Dec 2020
Port Hedland Airport 36.8 +0.4 44.9 14 Jan 2021 26.3 +1.2 21.9 11 Dec 2020 209.8 171.3 average 122%
Roebourne Aero 38.2 -0.6 47.1 14 Jan 2021 26.1 +0.3 20.6 11 Dec 2020 189.6 142.0 average 134%
Fortescue (district 05)
Barrow Island Airport 33.9 +0.8 39.9 11 Jan 2021 26.4 +0.8 21.5 14 Dec 2020 61.0 77.8 average 78%
Karijini North 37.3   44.1 14 Jan 2021 24.8   18.5 6 Jan 2021 341.4
Learmonth Airport 37.7 +0.2 45.9 15 Jan 2021 23.7 +1.0 17.1 1 Dec 2020 28.0 75.7 average 37%
Mardie 37.3 -0.4 45.3 15 Jan 2021 26.1 +1.6 20.4 11 Dec 2020 76.0 109.0 average 70%
Onslow Airport 36.8 +0.6 46.7 15 Jan 2021 25.8 +1.8 22.0 14 Dec 2020 43.4 100.6 average 43%
Thevenard Island 34.0 +1.0 41.8 11 Jan 2021 26.4 +1.3 23.4 1 Dec 2020 33.0 80.4 average 41%
West Gascoyne (district 06)
Carnarvon Airport 32.3 +1.2 45.6 21 Dec 2020 23.1 +0.9 16.0 1 Dec 2020 186.4 38.5 v high 484%
Denham 31.4 +0.8 44.1 21 Dec 2020 21.7 -0.2 14.0 1 Dec 2020 125.6 26.0 v high 483%
Murchison 37.9 -0.6 45.0 14 Jan 2021 22.4 +0.4 14.0 1 Dec 2020 126.2 67.1 high 188%
Shark Bay Airport 33.9 +0.2 44.7 28 Dec 2020 21.5 +0.3 14.2 1 Dec 2020 125.8 42.6 v high 295%
East Gascoyne (district 07)
Newman Aero 36.7 -1.9 43.5 13 Jan 2021 24.1 -0.3 17.3 6 Jan 2021 264.4 179.1 high 148%
Paraburdoo Aero 39.0 -1.1 45.9 14 Jan 2021 25.3 0.0 17.9 6 Jan 2021 221.2 163.5 high 135%
Murchison (district 07A)
Meekatharra Airport 37.3 +0.1 43.2 13 Jan 2021 23.8 +0.3 15.6 1 Dec 2020 32.0 80.3 low 40%
Mount Magnet Aero 36.0 -1.0 43.6 3 Dec 2020 22.3 -0.4 12.4 1 Dec 2020 106.4 80.8 high 132%
Paynes Find 35.2 -1.1 42.8 22 Jan 2021 20.4 +0.2 10.6 1 Dec 2020 74.4 57.5 average 129%
North Coast (district 08)
Dalwallinu 33.5 -1.0 42.4 25 Dec 2020 17.1 -0.4 6.6 1 Dec 2020 35.2 49.0 average 72%
Geraldton Airport 33.1   43.5 23 Dec 2020 19.0   9.8 1 Dec 2020 53.0
Kalbarri 32.6 -0.3 42.7 22 Dec 2020 20.1 +0.8 12.6 1 Dec 2020 17.3 17.2 average 101%
Morawa Airport 35.7 -0.8 43.7 25 Dec 2020 19.3 0.0 8.2 1 Dec 2020 38.6 55.0 average 70%
Mullewa 35.9 -0.1 43.4 25 Dec 2020 19.9 +1.0 9.9 1 Dec 2020 37.0 40.8 average 91%
North Island 28.1 +0.6 36.1 17 Jan 2021 21.6 +0.5 16.6 24 Dec 2020 68.6 18.0 high 381%
Wongan Hills 33.9 +0.1 42.7 25 Dec 2020 16.7 -0.6 6.8 1 Dec 2020 41.0 40.9 average 100%
Central Coast (district 09)
Badgingarra Research Stn 33.3 -0.5 43.0 25 Dec 2020 17.4 +0.8 6.8 1 Dec 2020
Bickley 29.8 0.0 39.1 25 Dec 2020 15.1 +0.1 6.5 1 Dec 2020 80.4 56.2 high 143%
Garden Island HSF 28.1 +1.1 39.5 8 Jan 2021 18.4 -0.2 11.2 1 Dec 2020 55.0 41.0 high 134%
Gingin Aero 32.7 +0.4 42.8 24 Dec 2020 16.4 +0.5 2.2 1 Dec 2020
Jandakot Aero 31.6 +0.9 41.3 8 Jan 2021 17.1 +0.9 5.0 1 Dec 2020 49.6 45.5 high 109%
Jurien Bay 31.0 +1.3 41.0 9 Jan 2021 17.9 +1.0 8.4 1 Dec 2020
Karnet 29.6 -0.2 38.6 25 Dec 2020 15.1 +0.2 4.8 1 Dec 2020 72.8 58.2 high 125%
Lancelin 29.8 +1.0 40.5 8 Jan 2021 17.4 +0.1 9.2 1 Dec 2020 85.2 33.3 high 256%
Millendon (Swan Valley) 32.6   42.2 24 Dec 2020 17.3   6.2 1 Dec 2020 34.0
Pearce RAAF 33.2 +0.8 42.6 24 Dec 2020 17.6 +1.2 5.4 1 Dec 2020
Perth Airport 32.3 +1.4 41.7 24 Dec 2020 17.4 +0.9 4.9 1 Dec 2020 31.4 37.0 average 85%
Perth Metro 31.6 +0.9 42.2 8 Jan 2021 17.7 +0.1 6.6 1 Dec 2020 43.2 42.6 average 101%
Rottnest Island 27.2 +0.9 39.7 8 Jan 2021 18.7 0.0 12.8 1 Dec 2020 51.8 38.7 high 134%
Swanbourne 29.5 +0.2 40.1 8 Jan 2021 18.3 +0.4 9.0 1 Dec 2020 51.0 41.9 high 122%
South Coast (district 09A)
Albany 21.9 -0.6 30.8 19 Jan 2021 16.0 +1.0 10.0 2 Dec 2020 89.4 76.7 average 117%
Albany Airport 23.9   37.3 8 Jan 2021 13.9   6.0 15 Dec 2020 117.4
Bridgetown 28.6 -0.5 39.1 8 Jan 2021 12.9 +0.4 3.9 15 Dec 2020 82.4 48.2 high 171%
Bunbury 29.9 +0.8 38.4 23 Dec 2020 15.0 +0.1 5.5 1 Dec 2020 59.8 36.8 high 163%
Busselton Aero 29.8 +0.4 38.0 8 Jan 2021 14.1 +0.3 6.1 14 Dec 2020 57.8 31.0 high 186%
Cape Leeuwin 23.5 +0.7 38.1 8 Jan 2021 17.2 +0.5 11.3 2 Dec 2020 101.2 53.4 v high 190%
Cape Naturaliste 27.8 +2.8 35.8 8 Jan 2021 15.2 +0.2 9.3 2 Dec 2020 85.4 36.0 v high 237%
Collie East 30.2 +0.1 39.4 8 Jan 2021 13.1 +0.2 5.1 1 Dec 2020 72.2 52.0 average 139%
Donnybrook 30.5 +0.7 40.2 8 Jan 2021     10.0 29 Jan 2021 74.4 44.1 high 169%
Dwellingup 30.1 +1.1 39.3 8 Jan 2021 14.3 +0.4 4.4 1 Dec 2020 84.4 59.9 high 141%
Esperance 25.3 -0.4 42.0 25 Dec 2020 15.0 -0.5 8.6 2 Dec 2020 34.2 71.5 low 48%
Esperance Aero 27.2 0.0 42.8 25 Dec 2020 13.9 -0.7 8.2 1 Dec 2020 39.4 76.9 low 51%
Hopetoun North 24.3 -0.6 40.5 9 Jan 2021 14.9 -0.2 8.1 2 Dec 2020 39.6 83.9 low 47%
Jarrahwood 29.4 +0.4 39.0 9 Jan 2021 13.0 +0.5 4.0 19 Feb 2021 105.4 47.6 v high 221%
North Walpole 23.9 -0.1 38.0 8 Jan 2021 14.0 -0.1 7.1 15 Dec 2020 131.2 96.4 high 136%
Rocky Gully 26.1 -0.8 39.6 9 Jan 2021 12.5 +0.2 5.8 15 Dec 2020 139.2 69.7 high 200%
Shannon 25.7 -0.2 39.1 8 Jan 2021 12.9 +0.4 5.7 15 Dec 2020 147.4 70.3 highest 210%
Windy Harbour 23.7 +0.7 37.5 8 Jan 2021 12.9 -1.1 8.5 16 Dec 2020 134.3 62.7 v high 214%
Witchcliffe 26.8 +0.6 38.9 8 Jan 2021 13.7 +0.1 6.4 2 Dec 2020 88.4 42.7 v high 207%
North Central (district 10)
Bencubbin     41.0 25 Dec 2020 17.3 -0.2 7.8 1 Dec 2020 33.9 50.5 average 67%
Cunderdin Airfield 33.5 -0.5 43.7 25 Dec 2020 16.2 -0.3 2.9 1 Dec 2020 29.4 48.1 average 61%
Merredin 32.8 -0.3 41.6 25 Dec 2020 17.4 +0.1 8.0 1 Dec 2020 31.6 44.5 average 71%
Northam 33.2 -0.2 43.8 25 Dec 2020 16.8 +0.2 5.5 1 Dec 2020 20.9 35.4 average 59%
York 33.3 -0.2 43.2 25 Dec 2020 15.4 -0.3 3.0 1 Dec 2020 25.1 60.4 average 42%
South Central (district 10A)
Beverley 33.8 +0.4 43.6 25 Dec 2020 15.7 -0.1 8.4 14 Dec 2020 23.6 37.6 average 63%
Brookton 32.2 +0.1 42.5 25 Dec 2020 15.1 +0.1 3.0 1 Dec 2020 16.5 39.2 average 42%
Hyden 32.4 -0.5 44.0 9 Jan 2021 14.8 -0.3 4.0 1 Dec 2020 34.2 54.8 average 62%
Jacup 26.9 -0.4 41.8 25 Dec 2020 12.4 -0.4 4.1 1 Dec 2020 51.0 78.9 low 65%
Katanning 29.1 -0.4 40.9 9 Jan 2021 13.1 -0.1 5.7 1 Dec 2020 46.0 61.6 average 75%
Lake Grace 30.1 -0.4 41.6 25 Dec 2020 14.6 -0.2 5.2 1 Dec 2020 23.2 70.2 low 33%
Narrogin 30.3 +0.2 40.2 9 Jan 2021 14.3 +0.6 4.0 1 Dec 2020 32.0 44.2 average 72%
Newdegate Research Station 30.2 -0.3 42.3 25 Dec 2020 13.4 +0.2 4.2 1 Dec 2020 36.2 56.2 average 64%
Pingelly 31.1 -0.1 41.4 25 Dec 2020 15.2 0.0 4.5 1 Dec 2020 23.4 38.2 average 61%
Ravensthorpe 27.5 -0.7 41.0 9 Jan 2021 13.7 -0.2 7.0 1 Dec 2020 44.6 74.7 average 60%
Wagin 30.0 -0.3 40.4 24 Dec 2020 14.3 +0.1 4.6 1 Dec 2020 36.5 42.6 average 86%
Wandering 31.3 -0.1 42.0 25 Dec 2020 13.6 0.0 2.3 1 Dec 2020 49.4 50.3 high 98%
Eucla (district 11)
Eucla 25.6 +0.1 44.6 18 Feb 2021 16.5 +0.2 9.9 2 Dec 2020 66.0 54.6 high 121%
Eyre 26.7 +0.3 43.6 4 Dec 2020 14.0 -1.2 1.4 2 Dec 2020 63.0 58.8 average 107%
Forrest 29.7 -2.7 45.1 22 Jan 2021 15.2 -0.8 8.5 2 Dec 2020 89.0 81.3 average 109%
South East (district 12)
Bulga Downs 35.2 -1.8 43.1 26 Dec 2020 20.3 -1.2 12.0 1 Dec 2020 71.9 73.4 average 98%
Kalgoorlie-Boulder Airport 31.2 -1.4 42.8 26 Dec 2020 17.6 -0.1 9.0 1 Dec 2020 110.4 75.9 high 145%
Laverton Aero 33.3 -1.2 43.3 21 Jan 2021 19.8 -1.0 12.7 5 Feb 2021 48.2 131.3 low 37%
Leinster Aero 34.9 -1.2 43.2 10 Jan 2021 21.1 -1.2 14.5 1 Dec 2020 75.6 103.3 average 73%
Leonora Aero 34.0 -1.8 44.1 22 Jan 2021 20.4 -1.5 13.9 5 Feb 2021 54.8 101.0 low 54%
Munglinup West 28.3 -0.2 41.9 25 Dec 2020 13.3 -0.8 7.4 1 Dec 2020 49.6 99.6 low 50%
Norseman Aero 31.0 -0.8 40.6 17 Feb 2021 14.6 -0.7 4.0 1 Dec 2020 40.4 80.8 low 50%
Salmon Gums Res.Stn. 29.6 -0.2 41.6 25 Dec 2020 12.9 -0.5 3.8 28 Dec 2020 71.4 70.5 average 101%
Southern Cross Airfield 33.0 -0.8 41.9 9 Jan 2021 17.1 0.0 6.3 1 Dec 2020 30.2 72.1 low 42%
North East (district 13)
Carnegie 36.7 -1.0 46.0 12 Jan 2021 21.4 -1.7 15.3 16 Dec 2020 229.1 121.3 high 189%
Giles Meteorological Office 34.6 -1.8 41.9 14 Jan 2021 21.7 -1.1 14.6 26 Feb 2021 303.4 125.6 v high 242%
Telfer Aero 38.2 -1.6 46.1 14 Jan 2021 25.9 +0.2 19.3 10 Dec 2020
Warburton Airfield 34.5 -2.6 42.9 12 Jan 2021 21.4 -0.9 15.8 16 Jan 2021 251.2 100.9 v high 249%
Wiluna Aero 36.5   43.0 10 Jan 2021 22.7   16.9 1 Dec 2020 76.8
Offshore Islands (district 200)
Adele Island 31.3   33.1 8 Jan 2021     21.9 25 Feb 2021
Rowley Shoals 30.3   33.7 10 Jan 2021 27.9   22.9 1 Feb 2021
Varanus Island 32.4 +0.5 37.6 18 Jan 2021 26.7 +0.8 21.2 14 Dec 2020 125.4 87.4 high 143%

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 3 pm on Monday 1 March 2021. 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

Climate