Western Australia in August 2018: Wet in the southwest; cooler nights in the north

Rainfall in August 2018 was close to average for Western Australia as a whole, though rainfall was above average for the South West Land Division and Eucla district. The statewide averaged mean minimum temperature was below average and the lowest in August since 1989, while mean maximum temperature was near average though it was the lowest since 2008.

Rainfall

  • Rainfall was near average for WA as a whole, though the driest August since 2014
  • Rainfall was above average for the South West Land Division (SWLD) as a whole, the wettest August since 2003
  • Many sites in the SWLD, particularly near the coast and in the Central Wheat Belt district had their wettest August on record, or wettest August for at least 20 years
  • Widespread moderate rainfall with localised heavy falls were recorded in the southwest WA in early and late August, and some daily rainfall records were broken

Temperatures

  • Mean maximum temperature was near average for WA as a whole, though it was the lowest in August for ten years
  • Mean maximum temperatures were below average in parts of the Kimberley, Pilbara and northern SWLD; a number of sites had their coolest August on record or coolest since 1997
  • Mean minimum temperature was a degree below average for WA as a whole, which was the lowest in August since 1989
  • Mean minimum temperatures were below to very much below average across the northern half of the State; several sites in the Kimberley and Pilbara had their coolest August on record or coolest for at least 20 years
  • Cold southerly winds swept through south of the State twice in early August, with daily maxima generally in the low 10s on the 4th and 9th, as well as a number of very cold spots of below 10 °C in the South West and Great Southern districts; several records were broken as a result
  • Northeasterly winds resulted in warm daily maxima in the mid-20s in the Lower West district on the 19th and 20th, including 24.9 °C, a record at Dwellingup on the 20th
  • Two notable events of record cold mornings were observed: firstly in the Goldfields on the 6th with below zero temperatures, and secondly in the Kimberley with daily minima below 10 °C on the 14th–16th

Snow reported on the Bluff Knoll

  • Bluff Knoll in the Stirling Ranges recorded snow fall on the 1st and 9th

Further information

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Extremes in August 2018
Hottest day 36.8 °C at Kalumburu on the 27th
Warmest days on average 34.5 °C at Kalumburu
Coolest days on average 14.5 °C at Katanning
14.5 °C at Shannon
Coldest day 8.4 °C at Shannon on the 9th
Coldest night -3.7 °C at Norseman Aero on the 18th
Coolest nights on average 3.4 °C at Southern Cross Airfield
Warmest nights on average 22.5 °C at Troughton Island
Warmest night 24.7 °C at Troughton Island on the 31st
Warmest on average overall 25.9 °C at Troughton Island
Coolest on average overall 9.6 °C at Newdegate Research Station
Wettest overall 303.6 mm at Bickley
Wettest day 64.2 mm at Margaret River on the 30th
Strongest wind gust 113 km/h at Cape Leeuwin on the 1st

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 August daily rainfall
New record
(mm)
Old
record
Years of
record
Doongin Peak 29.8 on the 29th 29.2 on the 3rd in 1932 112
Wilgarrup 51.4 on the 9th 50.5 on the 26th in 1962 112
Gidgegannup 58.4 on the 4th 54.6 on the 18th in 1989 59
Bakers Hill 40.6 on the 4th 38.2 on the 11th in 1992 53
Erinair 35.0 on the 22nd =35.0 on the 5th in 1994 51
Munglinup 32.0 on the 5th 27.0 on the 1st in 2017 28



Record highest August total rainfall
New record
(mm)
Old
record
Years of
record
Average for
August
Dalyup Park 172.0 162.3 in 1968 94 80.5
Roleystone 253.7 246.5 in 1965 52 157.9
Erinair 163.2 146.5 in 1968 51 68.2
Adina 185.6 181.2 in 1984 50 100.4
Esperance 149.0 145.4 in 1984 50 84.3
Mount Howick 147.6 131.4 in 1997 50 66.0
Esperance Aero 158.0 126.0 in 1997 48 71.0
The Duke 159.4 138.8 in 2016 42 87.7
Munglinup 133.0 124.2 in 1992 28 62.1
Perth Metro 186.0 175.6 in 2004 26 126.0
Morawa Airport 64.0 63.6 in 2003 21 34.9
Bridgetown 200.8 200.2 in 2017 20 122.5

Highest August total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
August
Mount Barker 151.6 164.2 in 1945 89.7
Pearce RAAF 194.6 225.8 in 1945* 106.2
Newbicup 145.2 153.3 in 1963 87.3
Wongan Hills 100.4 126.7 in 1963* 52.0
New Norcia 132.0 149.8 in 1963* 78.1
Pleasant Valley 172.2 179.1 in 1968* 73.0
Telina Downs 165.0 175.7 in 1968* 70.0
Oake Marsh Farm 176.2 227.7 in 1968* 78.9
Bickley 303.6 307.6 in 1977 176.1
Jandakot Aero 195.6 198.0 in 1976* 129.0
Cowaramup 245.5 253.6 in 1983 163.8
Eyre 67.4 =67.4 in 1984 29.8
Maida Vale 197.4 219.2 in 1977* 130.2
Karragullen North 256.1 264.4 in 1977* 166.7
Wilgarrup 186.2 194.2 in 1985* 134.1
Bolgart 107.0 118.0 in 1992 63.3
Codg Codgen 75.6 118.2 in 1992 39.2
Margaret River 233.8 238.4 in 1992 162.3
Narrogin 94.8 121.3 in 1992 67.9
Northampton 103.6 197.2 in 1992 73.0
Nunile 94.2 112.8 in 1992 62.4
Perth Airport 172.8 193.2 in 1992 118.9
Tammin 73.2 112.9 in 1992 42.9
Chidlow 198.5 213.6 in 1992* 138.7
Dandaragan West 161.5 164.2 in 1992* 96.2
Doongin Peak 80.0 99.7 in 1992* 41.5
Esperance Downs Research Stn 121.0 122.6 in 1992* 61.8
Northam 95.1 101.0 in 1992* 61.0
Telenning Hill 66.8 93.7 in 1992* 42.3
Naraling 92.6 162.6 in 1992* 55.2
Gidgegannup 247.2 256.0 in 1992* 139.1
Hines Hill 53.6 54.0 in 1994* 31.8
Bakers Hill 152.5 167.2 in 1992* 88.7
Bremer Bay 132.7 154.6 in 1992* 78.2
Mosman Park 144.6 163.2 in 1992* 107.0
Jaroma 65.5 66.2 in 1998 48.3
Manjimup 185.6 208.6 in 1998 145.6

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




Record highest August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Dwellingup 24.9 on the 20th 24.7 on the 26th in 1998 59 15.7



Record lowest August daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Leinster Aero 12.8 on the 5th 13.2 on the 21st in 1996 25 21.7
Paraburdoo Aero 17.6 on the 2nd 18.7 on the 24th in 2010 23 27.7
Katanning 9.8 on the 4th 9.9 on the 8th in 2016 20 15.4



Record lowest August mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Warmun 29.3 29.9 in 2014 56 32.3
Curtin Aero 31.5 31.6 in 2014 26 33.2
Morawa Airport 18.6 18.7 in 2004 21 20.3

Lowest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Derby Aero 31.3 30.3 in 1978* 32.7
Port Hedland Airport 28.5 =28.5 in 1997 29.3

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




Record highest August daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Paynes Find 17.4 on the 20th 16.8 on the 9th in 2002 39 6.0



Record lowest August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Giles Meteorological Office -1.4 on the 3rd -0.6 on the 21st in 1968 63 8.7
Ongerup -1.0 on the 18th -0.8 on the 31st in 2005 51 5.9
Derby Aero 6.1 on the 15th 6.6 on the 18th in 2014 34 15.9
Kununurra Aero 6.1 on the 15th 6.3 on the 17th in 2014 32 15.6
Warburton Airfield -3.4 on the 6th -3.0 on the 4th in 2000 29 7.2
Curtin Aero 4.2 on the 16th 6.9 on the 2nd in 2012 27 15.8
Laverton Aero -1.5 on the 6th -1.0 on the 9th in 2000 27 7.2
Jacup -1.2 on the 18th -1.0 on the 30th in 1995 26 5.7
Karratha Aero 8.0 on the 3rd = 8.0 on the 12th in 1995 26 14.3
Argyle Aerodrome 9.8 on the 14th = 9.8 on the 16th in 2014 25 17.4
Leinster Aero -0.4 on the 6th = -0.4 on the 3rd in 2017 25 7.7
Thevenard Island 10.9 on the 8th = 10.9 on the 21st in 2008 24 17.4
Fitzroy Crossing Aero 4.5 on the 15th 5.0 on the 5th in 2000 22 13.7
Kalumburu 6.8 on the 15th 7.0 on the 18th in 1999 20 14.6



Record lowest August mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Mandora 9.7 10.6 in 1977 55 13.2
Telfer Aero 9.8 10.5 in 2000 44 12.6
Derby Aero 11.9 12.0 in 2012 33 15.9
Karratha Aero 12.4 12.5 in 2000 25 14.3
Thevenard Island 16.2 16.5 in 2008 23 17.4
Fitzroy Crossing Aero 10.8 11.4 in 2012 21 13.7

Lowest August mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Port Hedland Airport 11.0 10.5 in 1961 13.2
Mardie 10.8 9.9 in 1986 12.5
Broome Airport 11.5 10.8 in 1994 14.9
Bidyadanga 13.4 11.9 in 1994* 14.9
Onslow Airport 12.6 12.5 in 1972* 13.6

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




Record lowest August mean temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Broome Airport 20.4 21.1 in 1986 79 22.6
Mandora 19.7 20.1 in 1986 55 22.1
Telfer Aero 18.3 = 18.3 in 1986 44 20.5
Derby Aero 21.6 22.5 in 2012 33 24.3
Kununurra Aero 22.5 = 22.5 in 2014 31 24.2
Curtin Aero 22.3 23.0 in 2004 26 24.5
Karratha Aero 19.7 20.2 in 2000 25 21.3
Fitzroy Crossing Aero 21.2 21.7 in 2014 21 23.5

Lowest August mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Learmonth Airport 18.0 17.2 in 1986 19.3
Port Hedland Airport 19.8 19.6 in 1986 21.2
Onslow Airport 19.6 18.9 in 1972* 20.5

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




Summary statistics for August 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2018
Diff
from
average
Highest for
August
2018
Mean for
August
2018
Diff
from
average
Lowest for
August
2018
Total for
August
2018
Average
for
August
Rank of
August
2018
Fraction of
August
average
North Kimberley (district 01)
Doongan 31.2 -0.4 34.0 28th 10.5 -1.7 4.8 9th 0 0.8 lowest 0%
Kalumburu 34.5 +0.9 36.8 27th 13.6 -1.0 6.8 15th 0 0.3 lowest 0%
Troughton Island 29.3 +0.4 30.9 11th 22.5 -0.1 19.9 16th 0 0.5 lowest 0%
Truscott 31.6 -0.1 33.3 11th 18.6 -0.3 13.8 16th 0.2 0.4 average 50%
Wyndham Aero 33.7 -0.3 36.6 27th 15.2 -0.9 8.5 15th 0 0.1 lowest 0%
East Kimberley (district 02)
Argyle Aerodrome 31.5 -0.6 34.7 30th 16.2 -1.2 9.8 14th 0 0.3 lowest 0%
Halls Creek Airport 28.8   33.5 28th 10.1   2.4 15th 0
Kununurra Aero 32.3 -0.5 35.7 29th 12.6 -3.0 6.1 15th 0 0.1 lowest 0%
Warmun 29.3 -3.0 35.1 29th 11.3 -3.5 5.3 14th 0 1.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 30.3 -0.8 35.5 19th 13.4 -1.5 8.5 4th 1.6 2.3 high 70%
Broome Airport 29.2 -1.1 34.7 19th 11.5 -3.4 5.7 4th 1.4 2.2 high 64%
Curtin Aero 31.5 -1.7 35.1 19th 13.2 -2.6 4.2 16th 0 2.4 lowest 0%
Cygnet Bay     32.0 20th 13.1 -1.7 8.0 16th 0 0.9 lowest 0%
Derby Aero 31.3 -1.4 35.4 19th 11.9 -4.0 6.1 15th 0.6 1.1 high 55%
Fitzroy Crossing Aero 31.7 -1.7 36.0 27th 10.8 -2.9 4.5 15th 0 3.0 lowest 0%
De Grey (district 04)
Bedout Island 24.8 -1.7 27.8 28th 18.7 -1.5 16.7 16th
Karratha Aero 27.0 -1.3 31.5 27th 12.4 -1.9 8.0 3rd 0 4.1 lowest 0%
Legendre Island 24.9   28.1 15th 16.7   14.4 7th
Mandora 29.6 -1.3 35.6 19th 9.7 -3.5 3.2 8th 0 2.5 lowest 0%
Marble Bar 28.4 -1.9 33.2 27th 11.1 -2.0 5.9 14th 0 0.5 v low 0%
Port Hedland Airport 28.5 -0.8 33.2 20th 11.0 -2.2 6.6 7th 0.4 4.7 average 9%
Roebourne Aero 28.9 -1.4 33.1 18th 9.9 -2.7 5.1 7th 0 0.7 v low 0%
Fortescue (district 05)
Barrow Island Airport 23.8 -1.4 29.3 18th 16.5 -1.3 13.4 8th 1.0 2.6 average 38%
Learmonth Airport 25.7 -0.7 30.9 17th 10.4 -1.7 5.2 13th 1.2 11.4 average 11%
Mardie 28.3 -1.3 33.9 20th 10.8 -1.7 6.8 12th 0 7.1 lowest 0%
Onslow Airport 26.7 -0.6 30.9 18th 12.6 -1.0 8.2 7th 0.4 8.4 low 5%
Thevenard Island 24.8 -1.3 28.4 18th 16.2 -1.2 10.9 8th 1.2 2.9 average 41%
Wittenoom 26.4 -0.6 31.0 21st 10.9 -2.3 6.4 7th 0 7.8 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 23.7 +0.6 29.1 18th 10.7 -0.9 4.4 12th 12.4 17.5 average 71%
Denham 21.8 -0.8 28.0 19th 12.2 -1.1 9.0 16th 23.6 21.9 average 108%
Shark Bay Airport 22.9 -1.3 31.8 19th 10.1 -1.0 5.0 12th 30.0 20.7 average 145%
East Gascoyne (district 07)
Newman Aero 24.8 -1.4 30.3 28th 6.3 -1.7 1.0 12th 0 6.6 lowest 0%
Paraburdoo Aero 25.9 -1.8 31.5 20th 8.6 -2.4 3.5 4th 0 10.1 lowest 0%
Murchison (district 07A)
Meekatharra Airport 21.9 +0.3 29.4 20th 8.1 -0.5 2.2 6th 6.4 10.8 average 59%
Mount Magnet Aero 20.6 -0.7 29.8 20th 7.6 -0.4 1.6 11th 18.8 17.0 average 111%
Paynes Find 19.5 -0.6 29.6 19th 5.9 -0.1 0.0 11th 37.0 27.4 average 135%
North Coast (district 08)
Dalwallinu 16.7 -1.6 25.6 20th 5.7 -0.4 1.4 12th 79.0 40.4 v high 196%
Geraldton Airport 19.6   26.8 19th 8.4   2.6 12th 65.0
Kalbarri 21.9 -0.6 29.8 19th 9.9 0.0 2.6 11th 44.6 47.7 average 94%
Morawa Airport 18.6 -1.7 28.1 20th 5.9 -0.6 1.4 11th 64.0 34.9 highest 183%
Mullewa 19.3 -0.9 28.4 20th 6.5 -0.7 3.1 11th 52.3 42.3 high 124%
North Island 20.9 -0.7 25.4 19th 14.6 -0.8 9.4 8th 26.4 35.8 low 74%
Wongan Hills 17.2 -0.7 26.0 20th 6.5 -0.2 2.5 11th 100.4 52.0 v high 193%
Central Coast (district 09)
Badgingarra Research Stn 17.2 -1.1 25.8 19th 7.2 +0.1 3.2 10th 24.2 83.9 v low 29%
Bickley 15.0 -1.0 22.2 20th 6.8 -0.8 2.8 10th 303.6 176.1 v high 172%
Garden Island HSF 17.2 -0.9 23.3 20th 10.4 -0.9 5.6 19th 112.2 95.9 high 117%
Gingin Aero 18.5 -0.6 24.6 20th 6.6 0.0 0.3 11th 162.8 109.8 v high 148%
Jandakot Aero 18.1 -0.6 25.8 20th 7.3 +0.1 1.4 12th 195.6 129.0 v high 152%
Jurien Bay 19.5 -0.5 24.1 20th 9.6 +0.2 2.9 24th 85.3 80.6 average 106%
Lancelin 19.1 -0.3 26.4 19th 9.6 -0.4 5.0 24th 116.5 91.2 high 128%
Millendon (Swan Valley) 18.4   24.3 19th 7.6   2.4 11th 180.0
Pearce RAAF 18.3 -0.1 24.3 20th 8.1 -0.1 2.6 11th 194.6 106.2 v high 183%
Perth Airport 18.5 -0.1 25.3 20th 7.8 -0.3 2.5 10th 172.8 118.9 v high 145%
Perth Metro 18.4 -0.7 25.3 20th 8.1 -0.2 2.8 11th 186.0 126.0 highest 148%
Rottnest Island 17.4 -0.5 22.3 20th 11.6 -0.8 6.8 10th 108.4 87.9 high 123%
Swanbourne 18.0 -0.9 25.7 20th 9.7 -0.4 5.2 11th 150.0 119.1 high 126%
South Coast (district 09A)
Albany 16.2 -0.1 23.1 13th 9.1 +0.7 5.4 19th 147.8 126.3 high 117%
Albany Airport 16.4   22.6 20th 7.3   1.1 18th 157.4
Bridgetown 15.6 -0.8 21.3 20th 4.8 -0.3 -1.7 18th 200.8 122.5 highest 164%
Bunbury 16.9 -0.7 22.3 20th 6.9 -0.8 2.2 10th 146.2 121.5 high 120%
Busselton Aero 16.2 -1.1 19.3 13th 7.3 0.0 2.4 18th 93.2 108.9 average 86%
Cape Leeuwin 16.5 0.0 22.1 20th 11.2 0.0 7.5 29th 130.0 136.0 average 96%
Cape Naturaliste 16.7 +0.2 20.5 20th 9.8 -0.3 5.0 10th 133.6 112.7 average 119%
Collie East 16.6 -0.5 24.9 20th 3.7 -1.1 -1.8 18th 136.2 121.0 average 113%
Donnybrook 17.1 -0.2 22.0 20th 6.6 +0.5 2.0 13th 176.6 148.9 high 119%
Dwellingup 15.7 0.0 24.9 20th 5.3 -0.2 -0.1 11th 269.2 194.9 high 138%
Esperance 17.8 -0.2 26.0 27th 8.7 +0.1 6.1 19th 149.0 84.3 highest 177%
Esperance Aero 17.0 -0.4 24.3 27th 7.5 -0.2 4.9 5th 158.0 71.0 highest 223%
Hopetoun North 18.0 -0.7 25.4 13th 7.7 -0.1 3.1 19th 69.8 55.0 high 127%
Jarrahwood 16.7 -0.2 22.0 19th 4.9 -0.3 -1.5 18th 226.8 147.8 v high 153%
Mandurah 16.9 -1.2 21.6 20th 10.2 -0.9 5.7 10th 131.8 97.7 high 135%
Manjimup 14.7 -0.4 21.8 20th 6.5 0.0 1.9 18th 185.6 145.6 high 127%
North Walpole 15.8 -0.8 21.9 20th 8.5 -0.6 2.7 18th 172.4 156.0 average 111%
Shannon 14.5 -1.0 21.3 20th 6.4 -0.6 0.5 18th 205.6 135.5 high 152%
Witchcliffe 15.8 -1.0 21.1 20th 8.3 +0.1 0.9 18th 219.4 159.3 v high 138%
North Central (district 10)
Bencubbin 16.3 -1.4 26.2 20th 5.2 -0.8 0.4 11th 36.2 37.5 average 97%
Cunderdin Airfield 16.7 -1.3 23.4 20th 4.4 -0.2 -0.1 11th 59.6 42.3 v high 141%
Merredin 16.7 -0.8 25.0 20th 5.5 0.0 1.9 23rd 61.6 39.2 high 157%
Northam 17.3 -0.7 22.4 26th 5.0 -0.6 0.2 12th 95.1 61.0 v high 156%
York 17.4 -0.6 22.6 20th 3.6 -0.4 -1.0 13th 84.5 58.3 high 145%
South Central (district 10A)
Beverley 16.8 -1.0 23.2 20th 4.0 -1.1 0.2 11th 76.4 58.8 high 130%
Brookton 16.2 -0.6 22.1 21st 3.7 -0.9 -0.5 12th 71.1 62.3 average 114%
Corrigin 15.7 -0.7 23.1 20th 3.9 -0.9 -1.5 18th 67.6 47.8 high 141%
Hyden 17.0 -0.6 26.3 20th 4.1 -0.6 -0.7 18th 75.4 41.3 v high 183%
Jacup 16.3 -0.5 23.9 20th 5.1 -0.6 -1.2 18th 57.2 51.9 average 110%
Katanning 14.5 -0.9 21.4 20th 5.3 -0.7 0.2 18th 68.2 59.9 average 114%
Lake Grace 15.9 -0.9 25.8 20th 5.3 -0.4 -0.5 18th 34.8 37.2 average 94%
Narembeen 16.8 -0.9 25.0 20th 4.9 -0.5 0.1 11th 78.6 42.4 v high 185%
Narrogin 15.5 +0.2 23.1 20th 4.6 -0.6 0.4 18th 94.8 67.9 high 140%
Newdegate Research Station 15.4 -0.9 23.7 20th 3.9 -0.4 -2.6 18th 46.8 44.6 average 105%
Pingelly 15.9 -0.2 22.5 20th 5.0 -0.7 1.3 23rd 79.9 62.1 high 129%
Ravensthorpe 17.3 0.0 23.0 20th 6.3 -0.4 2.0 12th 49.7 45.1 average 110%
Wagin 15.4 -0.7 23.5 20th 5.4 -0.3 0.0 18th 65.7 56.8 average 116%
Wandering 15.8 -0.7 24.0 20th 4.0 -0.1 -0.9 18th 135.0 94.3 v high 143%
Eucla (district 11)
Balladonia 18.9 -0.4 25.8 1st 4.7 -0.6 0.0 18th 21.0 21.3 average 99%
Eucla 19.8 +0.6 30.6 29th 7.9 +0.4 3.8 16th 37.4 26.3 high 142%
Eyre 19.6 +0.1 28.3 28th 5.9 -0.1 -1.6 17th 67.4 29.8 v high 226%
Forrest 20.5 -0.5 30.5 28th 6.1 +0.3 1.1 19th 23.8 13.8 high 172%
Red Rocks Point 18.5 -1.0 29.2 28th 7.9 -0.3 1.8 20th 89.6 42.4 v high 211%
South East (district 12)
Bulga Downs 20.7 -1.4 28.7 20th 4.9 -1.2 -0.5 6th
Kalgoorlie-Boulder Airport 18.6 -0.1 26.5 27th 6.1 +0.4 0.8 11th 29.8 21.3 high 140%
Laverton Aero 20.2 -0.6 27.9 21st 6.3 -0.9 -1.5 6th 12.6 10.2 average 124%
Leinster Aero 20.7 -1.0 28.1 20th 6.5 -1.2 -0.4 6th 9.0 8.9 average 101%
Leonora Aero 20.7 -1.1 27.8 27th 6.2 -1.3 -0.3 6th 17.8 11.3 average 158%
Munglinup West 17.1 -0.9 25.0 13th 6.4 -0.5 2.1 19th 81.0 45.7 high 177%
Norseman Aero 18.3 -1.0 26.3 27th 4.1 -0.4 -3.7 18th 26.6 23.0 average 116%
Salmon Gums Res.Stn. 17.2 -0.2 25.9 27th 5.0 +0.3 -1.5 18th 62.2 34.2 v high 182%
Southern Cross Airfield 16.9 -1.6 26.5 20th 3.4 -0.4 -1.1 11th 46.8 31.0 high 151%
North East (district 13)
Carnegie 23.3 -0.9 30.2 28th 5.8 -1.5 -0.6 6th 0.2 6.7 average 3%
Giles Meteorological Office 23.0 +0.2 30.3 28th 7.6 -1.1 -1.4 3rd 0 9.5 lowest 0%
Telfer Aero 26.9 -1.6 32.8 28th 9.8 -2.8 2.6 6th 0 4.7 lowest 0%
Warburton Airfield 23.2 -0.1 31.8 28th 5.4 -1.8 -3.4 6th 0.4 8.8 average 5%
Wiluna 21.6 -0.3 28.5 27th 6.1 -0.7 -1.0 6th 2.7 9.9 average 27%
Wiluna Aero 22.1   28.9 20th 6.5   -0.7 6th 2.0
Offshore Islands (district 200)
Adele Island 27.0   29.4 19th     21.7 13th
Rowley Shoals 24.6   26.3 19th 21.9   19.5 4th

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 Monday 3 September 2018. 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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