Western Australia in April 2020: very warm and dry

April was a very warm and dry for Western Australia. Most of the State saw above average mean maximum and minimum temperatures, with the month being the fifth–highest mean maximum temperature and second–highest mean minimum temperature on record for the State as a whole. Rainfall was below average in the western and southern WA, and only wet patches were observed in the Kimberley and Pilbara coast.

Below average rainfall in the west and south of WA

  • The western and southern WA recorded little or less than 10 mm in April apart from the southwest, several sites in the Gascoyne, Great Southern and Eucla either had their driest April on record or driest April since 1995
  • An area in the Kimberley saw above average rainfall which was largely due to showers and thunderstorms with isolated 50–60 mm falls on the 7th and 8th; Yulmbu's 58.8 mm on the 7th was its highest April daily rainfall on record

Above average daytime and overnight temperatures across most the State

  • Western Australia mean temperature was 2.39 °C above average, which was the second–warmest April on record and behind the record (+2.61 °C) in April 2005
  • WA mean maximum temperature was 2.53 °C above average, which was the fifth–warmest April on record
  • Many new April temperature records were registered in various locations during the month, and starting in the north and east Kimberley on the 4th and 5th
  • Daytime temperatures in the State's southwest were persistently warm from the 7th and peaked on the 11th when daily maxima reached the high thirties to low forties and April temperature records set in and around Perth area
  • The heat moved east and led to several new April temperature records in the South East Coast, southern Goldfields and Southern Interior districts between the 12th and 15th
  • For many locations in the Pilbara and Kimberley districts, hot temperatures had not eased and had even intensified for some in later parts of the month; Broome Airport and Pardoo Station had their highest April temperature on the 23rd, while Mardie's 42.8 °C on the 23rd was the nation–wide highest temperature of the month
  • Mandora in the far west Kimberley coast recorded two consecutive days with temperatures of 42 °C or above, which were 42.1 °C on the 25th (Anzac Day) and 42.0 °C on the 26th, the first time that Australia had a 42.0 °C post Anzac Day
  • WA mean minimum temperature was 2.25 °C above average, which was the second-warmest April on record and behind the record (+2.35 °C) in April 2005
  • The month started with a number of record high April minimum temperatures in the Kimberley; Argyle Aerodrome's 31.1 °C on the 2nd was the national highest April minimum temperature on record, and the previous record was 31.0 °C om 4 April 1986 at Roebourne
  • The month finished with two cold nights and a number of record low temperatures in the south
  • A minimum of -0.4 °C at Wandering (Great Southern) on the 29th was the State lowest temperature of the month, while a minimum of 0.0 °C at Norseman Aero on the 30th was the first freezing temperature in April at Norseman with records going back to 1957

Further information

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Extremes in April 2020
Hottest day 42.8 °C at Mardie on the 23rd
Warmest days on average 39.0 °C at Marble Bar
Coolest days on average 21.3 °C at Shannon
Coldest day 15.0 °C at Mount Barker on the 28th
Coldest night -0.4 °C at Wandering on the 29th
Coolest nights on average 10.1 °C at Wandering
Warmest nights on average 28.1 °C at Bedout Island
Warmest night 31.1 °C at Argyle Aerodrome on the 2nd
Warmest on average overall 31.7 °C at Wyndham Aero
Coolest on average overall 16.4 °C at Shannon
Wettest overall 126.0 mm at Drysdale River Station
Wettest day 62.0 mm at Drysdale River Station on the 8th
Strongest wind gust 85 km/h at Cape Leeuwin on the 20th

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 April daily rainfall
New record
(mm)
Old
record
Years of
record
Yulmbu 58.8 on the 7th 52.0 on the 19th in 2015 52



Record lowest April total rainfall
New record
(mm)
Old
record
Years of
record
Average for
April
Mount Magnet Aero 0.2 0.4 in 2007 25 18.2

Lowest April total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
April
Ninghan Station 1.8 0.0 in 1994 22.3
Chillinup 4.2 3.6 in 1995 32.8
Warra Jarra 7.2 6.2 in 1994* 35.0

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




Record highest April temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Narrogin 36.1 on the 11th = 36.1 on the 2nd in 1972 102 23.1
Broome Airport 41.1 on the 23rd 41.0 on the 10th in 2016 81 34.3
Perth Airport 39.6 on the 11th 37.7 on the 8th in 2013 76 25.6
Pearce RAAF 40.7 on the 11th 39.4 on the 8th in 2013 63 26.5
Dwellingup 36.7 on the 11th 34.7 on the 8th in 2013 60 22.5
Warmun 41.5 on the 4th 41.2 on the 12th in 1998 58 35.2
Karnet 36.6 on the 11th 35.0 on the 8th in 2013 54 23.3
Kununurra Aero 40.4 on the 4th 40.1 on the 2nd in 2018 35 35.4
Rottnest Island 35.2 on the 11th 33.1 on the 10th in 2009 31 23.7
Jandakot Aero 39.2 on the 11th 37.0 on the 8th in 2013 30 25.8
Warburton Airfield 40.1 on the 15th 39.7 on the 5th in 2016 30 29.5
Esperance Aero 36.9 on the 12th 35.8 on the 11th in 2013 29 23.6
Laverton Aero 39.6 on the 14th 39.3 on the 11th in 2019 29 26.9
Bickley 36.5 on the 11th 35.1 on the 8th in 2013 27 23.6
Gosnells City 39.5 on the 11th 38.5 on the 8th in 2013 27 26.5
Perth Metro 39.5 on the 11th 37.3 on the 8th in 2013 27 25.9
Swanbourne 37.3 on the 11th 35.9 on the 6th in 2005 27 25.3
Argyle Aerodrome 41.5 on the 4th 40.5 on the 2nd in 2015 26 35.2
Pardoo Station 42.7 on the 23rd 42.5 on the 7th in 2018 26 35.7
Bunbury 34.6 on the 11th 33.4 on the 12th in 2009 25 24.2
Mount Elizabeth 37.4 on the 5th 37.0 on the 9th in 2018 25 32.7
Cunderdin Airfield 38.7 on the 11th 38.1 on the 11th in 2013 24 26.6
Gingin Aero 40.1 on the 11th 37.8 on the 8th in 2013 24 26.7
York 39.0 on the 11th 37.2 on the 8th in 2013 24 26.4
Wandering 37.6 on the 11th 36.6 on the 9th in 2013 22 24.5
Norseman Aero 38.4 on the 12th 37.7 on the 12th in 2005 21 25.3
Wyndham Aero 41.4 on the 4th = 41.4 on the 6th in 2010 20 36.8



Record highest April daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Broome Airport 29.6 on the 1st = 29.6 on the 5th in 2010 81 22.7
Warmun 30.5 on the 2nd 28.8 on the 9th in 1992 58 20.6
Telfer Aero 30.2 on the 23rd 29.6 on the 11th in 2005 46 20.7
Doongan 26.8 on the 3rd 25.0 on the 9th in 2019 32 19.1
Argyle Aerodrome 31.1 on the 2nd 29.3 on the 5th in 2019 26 23.0
Jacup 19.4 on the 12th 19.0 on the 19th in 1996 26 10.8
Mount Elizabeth 24.9 on the 3rd 24.2 on the 6th in 1996 25 16.8
Newdegate Research Station 19.0 on the 12th 18.1 on the 1st in 2019 24 10.2
Kalumburu 25.6 on the 4th = 25.6 on the 2nd in 2013 22 21.1
Katanning 19.8 on the 12th 19.0 on the 21st in 2003 22 11.0
Wandering 20.7 on the 8th 20.0 on the 15th in 1999 22 9.5
Witchcliffe 20.2 on the 9th 19.3 on the 17th in 2011 22 11.1
Wyndham Aero 29.9 on the 3rd 28.6 on the 7th in 2010 20 23.4



Record lowest April temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Windy Harbour 4.3 on the 30th 4.4 on the 25th in 1984 30 12.2
Wandering -0.4 on the 29th 0.6 on the 25th in 2010 22 9.5
Norseman Aero 0.0 on the 30th 0.8 on the 20th in 2019 21 11.0



Record highest April mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Port Hedland Airport 24.5 23.7 in 2005 71 21.5
Mardie 24.9 23.7 in 2007 64 21.2
Ravensthorpe 14.9 14.6 in 2013 57 11.8
Onslow Airport 24.8 23.8 in 2018 53 21.5
Learmonth Airport 22.3 = 22.3 in 1978 45 20.4
Telfer Aero 24.8 23.7 in 2010 45 20.7
Warburton Airfield 19.6 19.5 in 2010 45 15.4
Karratha Aero 26.1 24.9 in 2005 26 22.8
Paraburdoo Aero 23.1 22.4 in 1996 24 19.8
Thevenard Island 25.9 25.8 in 2018 24 24.4
Newman Aero 21.5 20.5 in 2010 23 17.6
Fitzroy Crossing Aero 23.2 = 23.2 in 2019 22 20.8
Barrow Island Airport 26.3 26.0 in 2018 21 24.6
Witchcliffe 13.2 = 13.2 in 2013 21 11.1

Highest April mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
April
Meekatharra Airport 19.3 19.8 in 1981 17.1
Carnarvon Airport 20.8 =20.8 in 1995 19.2
Argyle Aerodrome 25.1 25.3 in 1998 23.0



Record highest April mean temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Port Hedland Airport 31.0 = 31.0 in 2018 71 28.4
Learmonth Airport 29.1 = 29.1 in 2018 45 26.9
Telfer Aero 31.3 30.7 in 2005 45 27.6
Karratha Aero 31.1 30.9 in 2018 26 28.6
Argyle Aerodrome 31.4 31.1 in 2018 25 29.1
Mount Elizabeth 27.0 26.5 in 2010 24 24.7
Paraburdoo Aero 29.8 29.3 in 2016 24 26.8
Newman Aero 28.3 28.0 in 2005 23 24.8

Highest April mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
April
Kununurra Aero 29.9 30.2 in 1998 28.6
Warmun 29.9 =29.9 in 1998 27.9



Summary statistics for April 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
April
2020
Diff
from
average
Highest for
April
2020
Mean for
April
2020
Diff
from
average
Lowest for
April
2020
Total for
April
2020
Average
for
April
Rank of
April
2020
Fraction of
April
average
North Kimberley (district 01)
Doongan 34.5 +1.2 38.2 5th 21.2 +2.1 16.2 11th 26.8 45.0 average 60%
Kalumburu 36.1 +1.2 39.4 5th 22.0 +0.9 18.3 30th 21.0 37.0 average 57%
Mount Elizabeth 34.9 +2.2 37.4 5th 19.0 +2.2 12.5 27th 29.4 39.8 average 74%
Troughton Island 33.1 +0.3 34.5 4th 27.6 +0.7 23.2 12th 13.6 31.8 average 43%
Truscott 33.9 +0.5 36.6 26th 24.9 +0.7 21.4 11th 17.4 71.5 average 24%
Wyndham Aero 38.6 +1.8 41.4 4th 24.8 +1.4 20.8 11th 10.0 25.8 average 39%
East Kimberley (district 02)
Argyle Aerodrome 37.8 +2.6 41.5 4th 25.1 +2.1 21.1 11th 2.2 23.8 average 9%
Halls Creek Airport 36.6   39.2 21st 20.8   16.9 14th 10.8
Kununurra Aero 37.4 +2.0 40.4 4th 22.4 +0.6 17.9 29th 20.6 30.1 average 68%
Warmun 37.4 +2.2 41.5 4th 22.4 +1.8 18.0 29th 39.5 25.0 high 158%
West Kimberley (district 03)
Bidyadanga       24.4 +2.3 19.0 11th 64.2 25.2 high 255%
Broome Airport 34.9 +0.6 41.1 23rd 25.6 +2.9 20.0 11th 7.6 25.4 average 30%
Curtin Aero 37.7 +1.2 40.7 23rd 23.1 +0.8 18.1 27th 5.6 38.2 average 15%
Cygnet Bay 34.6 +1.0 37.0 5th 24.5 +2.0 21.2 12th 13.2 40.1 average 33%
Derby Aero 36.9 +1.2 41.1 23rd 24.5 +1.7 21.9 10th 30.4 24.2 average 126%
Fitzroy Crossing Aero 38.6 +1.7 41.2 23rd 23.2 +2.4 20.3 27th 6.0 26.0 average 23%
Yampi Sound (Defence) 37.5   41.3 23rd 23.2   19.6 11th 35.8
De Grey (district 04)
Bedout Island 33.5 +1.0 35.5 3rd 28.1 +1.2 24.9 30th
Karratha Aero 36.2 +1.8 40.7 23rd 26.1 +3.3 23.3 12th 0 16.7 lowest 0%
Legendre Island 32.9   37.1 23rd 27.3   24.6 10th
Mandora 37.7 +1.5 42.1 25th 23.0 +2.2 18.6 11th 28.8 19.2 high 150%
Marble Bar 39.0 +2.8 42.1 24th 24.2 +2.2 19.1 11th 1.4 19.6 average 7%
Pardoo Station 37.5 +1.8 42.7 23rd     19.0 30th 41.2 19.5 high 211%
Port Hedland Airport 37.6 +2.3 42.4 22nd 24.5 +3.0 21.7 11th 13.8 21.5 high 64%
Fortescue (district 05)
Barrow Island Airport 33.0 +1.7 35.8 26th 26.3 +1.7 22.4 5th 0.2 31.6 low 1%
Karijini North 36.7   40.0 24th 23.8   18.2 30th 12.8
Learmonth Airport 35.8 +2.5 40.0 24th 22.3 +1.9 18.5 2nd 0 17.8 lowest 0%
Mardie 37.5 +1.6 42.8 23rd 24.9 +3.7 20.1 2nd 0.2 19.3 average 1%
Onslow Airport 35.9 +2.0 41.8 24th 24.8 +3.3 21.3 2nd 0 11.1 lowest 0%
Thevenard Island 33.3 +1.2 37.9 27th 25.9 +1.5 21.4 5th 0 16.8 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 29.8 +0.6 36.4 17th 20.8 +1.6 16.8 29th 0 13.0 lowest 0%
Denham 27.9 -0.7 32.7 10th       0.6 13.5 average 4%
Murchison 32.6 +1.6 39.0 11th 18.0 +1.7 14.0 29th 0.8 20.9 low 4%
Shark Bay Airport 31.2 +0.1 37.7 10th 19.7 +1.4 16.6 21st 0.2 8.0 low 3%
East Gascoyne (district 07)
Newman Aero 35.1 +3.0 39.7 24th 21.5 +3.9 13.9 30th 17.4 21.3 average 82%
Paraburdoo Aero 36.6 +2.8 40.0 24th 23.1 +3.3 16.7 2nd 1.0 24.0 low 4%
Murchison (district 07A)
Meekatharra Airport 31.6 +2.3 38.7 14th 19.3 +2.2 11.4 30th 7.6 18.8 average 40%
Mount Magnet Aero 30.7 +1.8 37.8 18th 18.1 +1.8 10.8 29th 0.2 18.2 lowest 1%
Paynes Find 29.6 +1.1 38.0 11th 15.5 +1.3 7.7 29th 1.4 24.9 low 6%
North Coast (district 08)
Dalwallinu 27.8 +0.7 37.2 11th 13.5 +0.3 4.1 29th 5.0 12.5 average 40%
Geraldton Airport 28.5   39.5 10th 16.0   11.0 29th 1.6
Kalbarri 28.7 -0.8 33.4 10th 16.5 +0.2 10.4 21st 0.6 18.6 low 3%
Morawa Airport 29.7 +0.8 38.7 11th 15.2 +0.8 7.4 29th 3.6 17.4 low 21%
Mullewa 30.3 +1.5 38.8 11th 16.5 +1.4 7.6 29th 20.4 21.5 average 95%
North Island 26.8 +0.5 30.7 10th 20.6 +0.2 13.9 8th 3.6 15.0 low 24%
Wongan Hills 27.6 +1.1 37.9 11th 13.8 +0.4 5.5 29th 8.2 22.1 low 37%
Central Coast (district 09)
Badgingarra Research Stn 27.6 +0.4 38.3 11th 14.5 +0.9 8.6 29th 0 26.5 lowest 0%
Bickley 24.0 +0.4 36.5 11th 13.5 +0.9 6.6 29th 18.2 54.7 low 33%
Garden Island HSF 24.4 +0.6 37.1 11th 17.0 +0.9 11.3 29th 8.8 35.8 v low 25%
Gingin Aero 27.4 +0.7 40.1 11th 12.2 +0.2 5.1 3rd 13.4 27.2 low 49%
Gosnells City 26.7 +0.2 39.5 11th 14.4 -0.4 10.0 20th 8.0 41.7 low 19%
Jandakot Aero 26.2 +0.4 39.2 11th 13.5 +1.0 6.2 3rd 16.4 41.1 low 40%
Jurien Bay 26.2 -0.2 32.0 12th 15.0 +1.0 7.8 30th 9.0 29.1 low 31%
Karnet 24.3 +1.0 36.6 11th 12.6 +0.8 6.2 29th 19.1 64.6 low 30%
Lancelin 25.7 +0.2 33.7 11th 15.1 +0.6 6.7 30th 5.6 30.1 low 19%
Millendon (Swan Valley) 27.5   40.4 11th 13.2   7.1 29th 10.2
Pearce RAAF 28.0 +1.5 40.7 11th 13.5 +0.2 7.0 3rd 10.4 34.0 low 31%
Perth Airport 26.9 +1.3 39.6 11th 13.5 +0.5 8.3 3rd 14.0 39.7 low 35%
Perth Metro 26.4 +0.5 39.5 11th 14.7 +0.9 8.9 3rd 13.2 35.2 low 38%
Rottnest Island 24.2 +0.5 35.2 11th 17.9 +0.6 12.5 29th 6.6 32.3 low 20%
Swanbourne 25.2 -0.1 37.3 11th 16.3 +1.0 10.8 29th 14.0 38.3 low 37%
South Coast (district 09A)
Albany Airport 22.5   34.5 8th 13.0   5.8 17th 34.2
Bridgetown 23.7 +0.3 33.9 11th 11.2 +1.9 2.1 4th 48.0 48.5 average 99%
Bunbury 24.2 0.0 34.6 11th 13.5 +1.8 4.4 29th 23.6 35.9 average 66%
Busselton Aero 23.3 -0.7 31.4 7th 12.7 +1.7 5.0 30th 63.6 34.3 high 185%
Cape Leeuwin 21.9 +0.6 31.1 7th 16.5 +1.0 12.6 30th 48.8 58.6 average 83%
Cape Naturaliste 23.1 +1.2 29.3 7th 15.2 +1.3 9.1 29th 61.6 43.0 high 143%
Collie East 24.7 +0.9 36.4 11th 10.7 +1.8 1.1 29th 21.6 40.4 low 53%
Donnybrook 24.8 +0.7 36.4 11th       26.6 49.2 low 54%
Dwellingup 23.9 +1.4 36.7 11th 12.3 +2.0 5.2 29th 25.4 65.0 low 39%
Esperance 23.9 +0.6 36.8 12th 14.2 +0.9 7.7 5th
Esperance Aero 24.6 +1.0 36.9 12th 13.4 +0.7 8.6 5th 21.2 38.4 low 55%
Hopetoun North 23.7 +0.5 36.9 9th 13.9 +1.3 9.0 18th 29.4 34.7 average 85%
Jarrahwood 23.7 -0.1 31.5 11th 10.7 +2.1 3.0 29th 57.2 48.3 average 118%
Mandurah 24.5 +0.4 33.2 10th 16.9 +1.1 10.3 29th 8.2 37.5 low 22%
Manjimup 22.3 +1.1 32.8 8th 12.1 +1.3 5.6 30th 45.6 59.1 average 77%
North Walpole 21.8 +0.4 33.9 8th 13.5 +0.8 7.9 30th 47.6 80.5 low 59%
Rocky Gully 22.4 +0.5 33.6 8th 11.8 +0.9 4.4 4th 44.4 51.6 average 86%
Shannon 21.3 -0.1 32.5 8th 11.5 +0.7 3.7 30th 38.2 65.1 average 59%
Windy Harbour 22.5 +0.5 31.5 7th 14.1 +1.9 4.3 30th 43.7 67.4 low 65%
Witchcliffe 22.3 -0.2 30.7 7th 13.2 +2.1 4.1 30th 48.6 61.3 average 79%
North Central (district 10)
Bencubbin 26.2 +0.3 36.5 11th 14.0 +1.1 6.0 29th 7.7 22.1 average 35%
Cunderdin Airfield 27.7 +1.1 38.7 11th 12.7 +0.7 6.3 20th 3.0 22.8 low 13%
Merredin 26.7 +1.1 37.0 11th 14.1 +1.2 6.1 20th 3.8 22.6 low 17%
Northam 27.7 +1.6 38.9 11th 13.5 +1.5 5.6 29th 7.4 23.1 average 32%
York 27.6 +1.2 39.0 11th 11.8 +1.0 4.4 29th 8.0 20.8 average 38%
South Central (district 10A)
Beverley 27.5 +1.3 38.8 11th 12.1 +0.8 2.8 29th 6.6 23.1 low 29%
Brookton 26.2 +1.2 37.5 11th 11.9 +0.7 5.0 20th 8.8 25.5 low 35%
Corrigin 25.7 +1.4 37.0 11th 12.4 +1.2 5.0 30th 10.2 22.8 average 45%
Jacup 24.8 +1.8 35.2 9th 11.4 +0.6 5.7 16th 10.4 38.8 low 27%
Katanning 24.2 +0.9 35.4 11th 11.8 +0.8 5.3 4th 6.0 28.4 low 21%
Lake Grace 25.2 +0.9 36.2 11th 12.6 +0.7 4.8 29th 7.6 23.2 low 33%
Narrogin 25.1 +2.0 36.1 11th 11.9 +1.4 3.0 29th 3.6 29.0 low 12%
Newdegate Research Station 25.6 +1.4 36.4 11th 11.0 +0.8 1.9 4th 11.0 25.9 average 42%
Ravensthorpe 25.3 +1.5 35.5 9th 14.9 +3.1 10.0 18th 18.9 32.3 average 59%
Wagin 24.4 +0.7 35.5 11th 11.5 +0.7 2.7 30th 6.7 28.3 low 24%
Wandering 25.5 +1.0 37.6 11th 10.1 +0.6 -0.4 29th 5.2 28.4 low 18%
Eucla (district 11)
Balladonia 26.9 +1.9 37.2 12th 11.9 +1.0 6.7 27th 1.4 19.4 low 7%
Eucla 25.2 +1.6 34.7 22nd 13.4 0.0 8.6 18th 11.2 26.3 low 43%
Eyre 26.3 +2.1 36.4 22nd 11.8 +0.1 2.1 17th 28.0 24.6 average 114%
Forrest 27.5 +1.1 40.0 14th 13.0 +1.0 6.6 30th 1.4 16.1 v low 9%
Red Rocks Point 25.1 +1.3 36.1 22nd 14.2 -0.1 9.5 27th 0 22.0 v low 0%
South East (district 12)
Bulga Downs 30.3 +1.6 37.6 13th 16.0 +1.8 8.4 30th 1.2 20.4 low 6%
Kalgoorlie-Boulder Airport 27.5 +2.2 36.7 12th 14.6 +1.9 4.4 30th 0.2 20.2 v low 1%
Laverton Aero 29.6 +2.7 39.6 14th 17.3 +2.3 7.2 30th 4.2 19.0 low 22%
Leinster Aero 30.1 +2.2 39.0 14th 17.1 +1.7 8.5 30th 3.2 24.6 v low 13%
Leonora Aero 29.9 +1.8 38.7 14th 16.8 +1.6 7.4 30th 0.6 14.7 v low 4%
Munglinup West 25.2 +0.9 35.6 9th 12.7 +0.6 6.8 29th 16.2 30.3 low 53%
Norseman Aero 26.8 +1.5 38.4 12th 11.7 +0.7 0.0 30th 3.4 23.5 low 14%
Salmon Gums Res.Stn. 25.6 +1.8 38.5 12th 11.1 +1.2 1.8 30th 7.8 26.3 low 30%
Southern Cross Airfield 27.3 +1.1 37.9 12th 12.8 +1.1 4.3 29th 4.4 21.4 low 21%
North East (district 13)
Carnegie 33.7 +3.4 38.8 14th 17.8 +1.6 9.5 30th 3.8 22.2 average 17%
Giles Meteorological Office 32.9 +3.4 38.0 25th 19.4 +2.9 7.9 30th 2.8 17.6 average 16%
Telfer Aero 37.8 +3.2 41.4 25th 24.8 +4.1 15.9 30th 2.8 18.1 average 15%
Warburton Airfield 32.6 +3.1 40.1 15th 19.6 +4.2 9.1 30th 10.6 18.5 average 57%
Wiluna Aero 31.5   38.9 14th 17.9   9.8 30th 5.4
Offshore Islands (district 200)
Adele Island 32.9   34.1 18th 28.4   24.4 9th
Browse Island 31.3   32.9 6th 28.0   23.1 11th
Varanus Island 32.5 +1.2 35.3 27th 27.6 +1.5 25.6 5th 0.6 33.8 average 2%

Notes

The Monthly 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 Friday 1 May 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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