Western Australia in August 2017: Wet in the southwest, above average temperatures

Rainfall was near average to above average in the southern half of Western Australia, and near average to below average in the northern half of the State. Daytime temperatures were higher than normal in the north and east, resulting in the state-wide mean maximum temperature ranking as eighth-highest in August on record. Much of WA saw warmer than normal overnight temperatures, except in the northeast.

Above average rainfall in southern parts; below average rainfall in the Interiors

  • Overall WA rainfall for August was close to the long-term average
  • Frequent rains at the start to mid-August resulted in a few sites recording their wettest August on record, and many sites having their wettest August for over 20 years
  • Rainfall averaged across the South West Land Division (SWLD) was the highest for August for 14 years, since 2003.
  • A couple of high daily rainfall records were observed near the southern coast on the 1st as a cold front passed through southern WA
  • A significant cold front moved through western and southern WA on the 8th and 9th and produced daily totals 30-70 mm; a number of sites broke August daily rainfall records as a result

Above average daytime temperatures in the north and east; above average overnight temperature

  • Mean maximum temperature for WA was 1.9 °C above average and 7th-highest on record
  • Daytime temperatures in west Kimberley were 2 °C to 3 °C warmer than normal, and Broom Airport and Bidyadanga had their warmest August on record
  • Mean daytime temperatures were 1°C to 2 °C cooler than normal in the Shark Bay region; Denham had its lowest August mean maximum temperature in 25 years
  • Persistent easterly winds produced temperatures in the mid-to-high 30s in the Kimberley and Pilbara between the 23rd and 28th and several sites saw record high August temperatures
  • The temperature reached 39.6 °C at Mandora on the 24th, which was the equal third-highest August temperature on record in WA, and a WA early season record
  • A trough near the west coast on the 27th brought mid-20s temperatures to western parts of WA, and resulted in a few August temperature records in the South West district
  • Daytime temperatures were below 10 °C in parts of southwest WA on the 9th in the wake of a cold front; some sites had their coldest August day on record
  • A maximum of 7.3 °C at Rocky Gully on the 9th was WA's lowest maximum temperature for 27 years, since a maximum of 7.0 °C was recorded at Mount Barker on 23 July 1990
  • The mean minimum temperature for WA was 0.8 °C above average, and 0.6 °C above average for the SWLD
  • Cold nights were observed in the SWLD, Goldfields, Gascoyne, and southern Pilbara in early August on the 2nd and 3rd with many sub-zero temperatures recorded, and a few August records reported
  • Carnavon Airport recorded both high and low minimum temperature records during the month: record low of 3.4 °C on the 3rd, equal high of 19.5 °C on the 14th

Severe winds gusts caused a building wall collapse in Perth

  • A series of cold fronts associated with a deep low pressure system supported by a strong upper level trough produced strong winds over much of the South West Land Division between 11th and 14th. A wall at the Matilda Bay Brewing Company in North Fremantle collapsed onto a parked car and the driver sustained severe injures on the 14th

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Extremes in August 2017
Hottest day 39.6 °C at Mandora on the 24th
Warmest days on average 35.3 °C at Wyndham Aero
Coolest days on average 14.9 °C at Rocky Gully
Coldest day 7.3 °C at Rocky Gully on the 9th
Coldest night -5.0 °C at Eyre on the 12th
Coolest nights on average 5.1 °C at Southern Cross Airfield
5.1 °C at York
Warmest nights on average 25.4 °C at Browse Island
Warmest night 26.4 °C at Browse Island on the 28th
Warmest on average overall 27.0 °C at Browse Island
27.0 °C at Troughton Island
26.3 °C at Truscott
Coolest on average overall 10.9 °C at Newdegate Research Station
10.9 °C at Rocky Gully
10.9 °C at Wandering
Wettest overall 281.0 mm at Dwellingup
278.2 mm at Huntly
Driest overall 0 mm at Argyle Aerodrome and other sites
Wettest day 72.4 mm at Jarrahwood on the 8th
Strongest wind gust 113 km/h at Busselton Jetty on the 11th
109 km/h at Cape Leeuwin on the 14th

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
Goomalling 38.2 on the 9th 33.5 on the 19th in 1941 107
Ygnattering 35.0 on the 9th 33.3 on the 11th in 1931 90
Happy Valley 34.0 on the 9th 24.1 on the 8th in 1945 81
Burekup 50.0 on the 9th 47.8 on the 2nd in 1922 63
Dandaragan West 46.2 on the 9th 45.8 on the 18th in 2005 61
Wereroa 51.0 on the 10th 50.8 on the 6th in 1973 58
Badgingarra Research Stn 49.8 on the 9th 49.0 on the 1st in 2012 55
Coodernuppin 31.0 on the 9th 27.8 on the 2nd in 1992 50
Jarrahwood 72.4 on the 8th 70.0 on the 4th in 1997 43
Munglinup 27.0 on the 1st 25.7 on the 31st in 1973 27
Rottnest Island 34.6 on the 9th 27.2 on the 12th in 2010 27
Ludlow 39.2 on the 8th 37.0 on the 18th in 1989 23
Hopetoun North 33.4 on the 9th 33.0 on the 15th in 2001 22
Rocky Gully 36.8 on the 1st 33.2 on the 23rd in 2003 22
Cunderdin Airfield 26.0 on the 9th 18.0 on the 16th in 2002 21
Bridgetown 52.4 on the 8th 44.6 on the 7th in 2013 20
Busselton Aero 54.2 on the 8th 45.2 on the 29th in 2014 20



Record highest August total rainfall
New record
(mm)
Old
record
Years of
record
Average for
August
Windrush 157.3 157.2 in 1992 57 80.1
Gibb Rock 81.0 72.0 in 2003 35 41.7
Wagerup Refinery 214.6 213.8 in 2013 35 132.4
Yourdamung Lake 198.2 187.8 in 2006 23 130.2
Cunderdin Airfield 61.4 58.6 in 2003 21 41.5

Highest August total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
August
Newbicup 120.4 129.6 in 1981 86.7
Jarrahwood 237.4 271.9 in 1983 146.0
Busselton Shire 168.7 204.0 in 1983* 115.8
Nannup 191.6 215.4 in 1985* 138.5
Perivale Orchard 196.2 255.9 in 1983* 132.6
Wokalup 203.2 225.5 in 1983* 134.0
Wilgarrup 165.6 194.2 in 1985* 133.6
Barrett Meadows 192.0 281.4 in 1992 133.4
Kirkalocka 57.0 77.0 in 1992 20.7
Lancelin 156.2 187.0 in 1992 90.7
Medina Research Centre 169.2 170.7 in 1992 115.4
Nunile 90.8 112.8 in 1992 61.3
Tammin 70.4 112.9 in 1992 42.6
Wandana 73.4 126.4 in 1992 32.1
Wundi 105.2 172.2 in 1992 55.7
Ygnattering 75.2 103.9 in 1992 42.3
Yuna 99.0 146.8 in 1992 44.7
Badgingarra Research Stn 131.8 146.2 in 1992* 85.0
Bungulla 72.5 100.0 in 1992* 40.3
Coodernuppin 64.2 93.2 in 1992* 36.9
Kellerberrin 74.8 121.4 in 1992* 41.2
Swanara 73.6 120.3 in 1992* 42.6
Tamar 189.0 234.2 in 1992* 90.0
Chillinup 73.0 98.6 in 1993* 41.9
Edjudina 60.0 79.0 in 1992* 17.1
Mullewa 95.6 104.4 in 1994 42.2
Howatharra 117.5 171.2 in 1992* 65.3
Jarrahdale 258.0 277.2 in 1992* 183.8
Pinjarra Refinery 179.7 192.0 in 1992* 125.7
Karara 76.6 104.4 in 1994* 39.7
Canna 75.6 =75.6 in 1997 42.9
Laverton Aero 30.4 32.0 in 1997 10.1

* 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
Wittenoom 35.3 on the 27th 34.5 on the 29th in 2007 65 26.9
Cape Naturaliste 23.6 on the 27th 23.3 on the 31st in 1970 61 16.4
Bidyadanga 38.2 on the 23rd 38.0 on the 31st in 2007 58 31.1
Mandora 39.6 on the 24th 38.3 on the 30th in 2007 56 30.8
Onslow Airport 37.7 on the 27th 35.2 on the 18th in 2012 53 27.3
Telfer Aero 36.2 on the 25th 36.0 on the 28th in 2012 44 28.4
Learmonth Airport 35.3 on the 27th 34.5 on the 29th in 1995 43 26.4
Karratha Aero 36.3 on the 25th 35.4 on the 27th in 1998 25 28.3
Bunbury 24.6 on the 27th 24.0 on the 15th in 2015 22 17.6
Paraburdoo Aero 35.4 on the 28th 34.9 on the 29th in 2007 22 27.6
Busselton Aero 23.8 on the 27th 23.1 on the 27th in 2015 20 17.3



Record lowest August daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Brookton 10.4 on the 9th 11.0 on the 28th in 2004 50 16.8
Beverley 11.2 on the 9th 11.3 on the 16th in 1990 48 17.8
Karratha Aero 21.8 on the 3rd 22.4 on the 11th in 1997 25 28.3
Newdegate Research Station 10.8 on the 9th 10.9 on the 28th in 2004 22 16.3
Rocky Gully 7.3 on the 9th 7.9 on the 27th in 2004 22 15.4



Record highest August mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Broome Airport 32.1 = 32.1 in 1980 78 30.3
Bidyadanga 33.6 33.5 in 2011 57 31.1



Lowest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Denham 20.8 =20.8 in 1992* 22.6

* 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
Carnarvon Airport 19.5 on the 14th = 19.5 on the 7th in 1976 71 11.6
Eyre 19.2 on the 9th 16.8 on the 7th in 2006 30 6.0
Paraburdoo Aero 19.5 on the 25th 19.0 on the 23rd in 1996 22 11.0



Record lowest August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Carnarvon Airport 3.4 on the 3rd 3.5 on the 4th in 1953 71 11.6
Pingelly -1.4 on the 10th -1.2 on the 23rd in 2010 47 5.7
Leinster Aero -0.4 on the 3rd -0.1 on the 4th in 2000 24 7.6
Paraburdoo Aero 2.0 on the 3rd 2.9 on the 12th in 2000 22 11.0



Record highest August mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Forrest 7.2 7.0 in 2009 24 5.8

Highest August mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Yeelirrie 7.2 8.5 in 1982 4.7



Summary statistics for August 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2017
Diff
from
average
Highest for
August
2017
Mean for
August
2017
Diff
from
average
Lowest for
August
2017
Total for
August
2017
Average
for
August
Rank of
August
2017
Fraction of
August
average
North Kimberley (district 01)
Kalumburu 35.1 +1.6 37.9 20th 15.0 +0.4 9.6 4th 0 0.3 v low 0%
Mount Elizabeth       8.6 -0.7 0.5 4th 0 2.0 lowest 0%
Troughton Island 30.0 +1.2 32.2 26th 23.9 +1.3 21.4 5th 0 0.5 lowest 0%
Truscott 32.8 +1.2 35.6 20th 19.8 +1.0 16.7 11th 0 0.4 v low 0%
Wyndham Aero 35.3 +1.4 38.3 21st 16.2 +0.1 9.8 4th 0 0.1 lowest 0%
East Kimberley (district 02)
Argyle Aerodrome 33.3 +1.2 37.0 18th 17.4 0.0 11.6 4th 0 0.3 lowest 0%
Halls Creek Airport 31.8   36.0 22nd 11.5   3.6 4th 0
Kununurra Aero 34.2 +1.5 37.5 24th 14.8 -0.9 8.7 4th 0 0.1 lowest 0%
Warmun 33.2 +0.9 37.6 18th 13.7 -1.1 7.3 5th 0 1.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 33.6 +2.5 38.2 23rd 14.3 -0.6 7.4 4th 0 2.3 lowest 0%
Broome Airport 32.1 +1.8 37.5 23rd 15.0 +0.1 7.6 5th 0.2 2.2 low 9%
Curtin Aero 34.2 +1.1 37.9 19th 15.8 0.0 9.7 3rd 0 2.5 lowest 0%
Cygnet Bay 30.4 +0.7 34.9 19th 15.6 +0.8 10.0 6th 0 1.0 lowest 0%
Derby Aero 34.4 +1.8 38.3 22nd 14.8 -1.1 7.4 4th 0 1.1 lowest 0%
Fitzroy Crossing Aero 34.8 +1.5 38.9 24th 13.7 0.0 5.8 3rd 0 3.1 lowest 0%
De Grey (district 04)
Bedout Island 27.0 +0.5 29.4 31st 20.4 +0.2 16.8 2nd
Karratha Aero 29.2 +0.9 36.3 25th 15.0 +0.7 8.3 4th 0.4 4.2 average 10%
Legendre Island 26.7   31.9 25th 19.0   14.3 4th
Mandora 33.3 +2.5 39.6 24th 12.1 -1.2 3.7 3rd 0 2.5 lowest 0%
Marble Bar 32.1 +1.9 38.0 25th 13.6 +0.5 5.9 4th 0.4 0.5 average 80%
Pardoo Station       13.8 +0.4 6.5 4th 0 4.7 lowest 0%
Port Hedland Airport 31.3 +2.1 36.4 25th 14.0 +0.8 6.7 3rd 0.2 4.8 low 4%
Roebourne Aero 31.3 +1.0 38.7 25th 12.8 +0.3 5.2 4th 0 0.8 v low 0%
Fortescue (district 05)
Barrow Island Airport 25.8 +0.6 30.1 24th 17.6 -0.2 12.2 3rd 2.2 2.7 average 81%
Learmonth Airport 27.8 +1.4 35.3 27th 12.3 +0.2 5.8 2nd 1.8 11.6 average 16%
Onslow Airport 29.1 +1.8 37.7 27th 14.9 +1.3 8.4 3rd 1.8 8.6 average 21%
Wittenoom 29.8 +2.9 35.3 27th 13.6 +0.4 5.8 3rd 0 7.9 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 22.8 -0.3 25.9 21st 12.3 +0.7 3.4 3rd 13.2 17.5 average 75%
Denham 20.8 -1.8 23.0 26th 13.4 +0.1 9.0 3rd 29.4 21.9 high 134%
Murchison 22.3 -0.8 30.3 27th 8.2 +1.1 -0.5 3rd 23.5 19.1 average 123%
Shark Bay Airport 22.7 -1.5 27.2 26th 11.6 +0.5 5.2 3rd 30.8 20.2 high 152%
East Gascoyne (district 07)
Newman Aero 27.8 +1.7 33.3 27th 9.4 +1.5 0.1 3rd 0.6 6.7 average 9%
Paraburdoo Aero 29.3 +1.7 35.4 28th 11.8 +0.8 2.0 3rd 3.2 10.4 average 31%
Murchison (district 07A)
Meekatharra Airport 22.8 +1.3 29.8 27th 9.4 +0.8 1.5 3rd 11.2 10.8 average 104%
Mount Magnet Aero 21.2 -0.1 28.1 7th 8.5 +0.5 0.8 3rd 23.0 16.9 average 136%
Paynes Find 20.6 +0.5 28.6 28th 6.6 +0.6 -1.3 3rd 38.0 27.2 high 140%
North Coast (district 08)
Dalwallinu 17.9 -0.4 25.8 28th 6.9 +0.8 1.7 3rd 62.4 38.5 v high 162%
Geraldton Airport 19.9   23.8 27th 8.0   2.4 3rd 84.6
Kalbarri 21.9 -0.6 24.8 26th 10.0 +0.1 2.7 3rd 39.1 47.8 average 82%
Morawa Airport 20.3 0.0 27.8 27th 7.2 +0.7 0.6 2nd 59.4 33.5 high 177%
Mullewa 20.4 +0.2 27.3 27th 8.2 +1.0 1.2 3rd 95.6 42.2 v high 227%
North Island 20.9 -0.7 23.6 8th 14.4 -1.0 5.5 18th 43.8 36.3 average 121%
Wongan Hills 17.8 -0.1 25.0 27th 6.6 -0.1 1.0 3rd 65.4 51.6 high 127%
Central Coast (district 09)
Badgingarra Research Stn 18.0 -0.3 24.4 28th 7.5 +0.4 1.6 3rd 131.8 85.0 v high 155%
Bickley 15.4 -0.6 22.0 28th 7.8 +0.2 3.4 1st 224.2 173.5 high 129%
Garden Island HSF 17.8 -0.4 24.4 27th 11.7 +0.4 4.8 3rd 132.6 94.9 v high 140%
Gingin Aero 18.8 -0.3 24.5 27th 7.5 +1.0 -0.6 2nd
Gosnells City 18.9 -0.5 25.1 28th 10.2 +1.3 3.4 1st 143.5 126.4 average 114%
Jandakot Aero 18.4 -0.3 25.2 28th 9.0 +1.9 0.7 2nd 169.0 127.5 high 133%
Jurien Bay 20.1 +0.1 25.2 27th 9.9 +0.5 2.9 18th 104.2 80.5 high 129%
Lancelin 19.6 +0.2 27.3 27th 9.9 -0.1 5.0 2nd 156.2 90.7 v high 172%
Medina Research Centre 19.2 +0.3 24.9 27th 9.1 +0.9 1.2 2nd 169.2 115.4 v high 147%
Millendon (Swan Valley) 18.8   23.7 28th 8.5   1.4 2nd 153.6
Pearce RAAF 18.7 +0.3 23.9 28th 8.8 +0.6 2.0 2nd 126.0 104.8 high 120%
Perth Airport 18.8 +0.2 24.6 28th 9.1 +1.1 1.0 2nd 144.6 118.1 high 122%
Perth Metro 18.7 -0.4 24.4 28th 9.4 +1.1 1.7 2nd 151.6 123.6 high 123%
Rottnest Island 17.9 0.0 22.8 27th 12.3 -0.1 8.2 1st 113.2 87.1 high 130%
Swanbourne 18.3 -0.6 24.4 27th 10.8 +0.7 5.1 2nd 156.2 117.8 v high 133%
South Coast (district 09A)
Albany 16.7 +0.4 20.0 18th     6.0 10th 166.8 126.1 high 132%
Albany Airport 16.3   20.4 30th 8.2   2.9 24th 165.0
Bridgetown 15.9 -0.6 22.1 29th 6.3 +1.3 0.2 10th 200.2 118.4 v high 169%
Bunbury 17.8 +0.2 24.6 27th 8.8 +1.2 1.9 10th 161.6 120.4 high 134%
Busselton Aero 17.3 0.0 23.8 27th 8.6 +1.4 2.4 10th 182.2 109.7 v high 166%
Cape Leeuwin 16.7 +0.2 19.6 29th 12.0 +0.8 8.3 10th 162.6 136.0 high 120%
Cape Naturaliste 17.6 +1.2 23.6 27th 10.4 +0.3 6.9 1st 137.6 112.6 high 122%
Collie East 16.6 -0.5 22.9 29th 6.1 +1.4 -1.2 10th 186.8 119.9 high 156%
Donnybrook 17.3 0.0 23.9 27th 7.4 +1.3 0.8 10th 190.1 148.7 high 128%
Dwellingup 15.7 0.0 22.4 27th 7.2 +1.7 -0.5 2nd 281.0 194.0 high 145%
Esperance 18.2 +0.2 26.8 8th 8.7 +0.1 4.6 24th 69.6 83.1 average 84%
Esperance Aero 17.8 +0.4 25.2 8th 7.4 -0.4 3.8 24th 54.4 69.2 average 79%
Hopetoun North 18.3 -0.4 23.4 8th 8.4 +0.6 4.2 18th 64.4 54.3 average 119%
Jarrahwood 17.0 +0.2 24.0 29th 6.3 +1.1 -1.0 24th 237.4 146.0 v high 163%
Mandurah 18.1 0.0 25.7 27th 11.4 +0.4 5.7 2nd 129.2 95.4 high 135%
Manjimup 15.4 +0.3 22.3 27th 7.3 +0.8 2.6 10th 159.8 145.2 average 110%
North Walpole 15.9 -0.8 20.6 27th 9.2 +0.1 5.8 24th 196.8 154.8 high 127%
Rocky Gully 14.9 -0.5 21.0 29th 6.9 +0.1 2.7 24th 148.4 91.9 v high 161%
Shannon 15.0 -0.5 21.2 28th 7.2 +0.2 2.2 10th 152.6 132.2 average 115%
Windy Harbour 16.6 -0.4 19.4 7th     5.1 25th   167.7    
Witchcliffe 16.5 -0.3 21.3 28th 8.8 +0.6 3.0 24th 206.4 156.1 high 132%
North Central (district 10)
Bencubbin 17.6 -0.1 24.2 28th 6.9 +1.0 2.1 3rd 53.2 37.5 high 142%
Cunderdin Airfield 17.8 -0.2 22.2 30th 5.5 +1.0 -0.9 2nd 61.4 41.5 highest 148%
Merredin 17.9 +0.5 23.2 28th 5.6 +0.1 -1.0 3rd 48.2 39.0 average 124%
Northam 17.9 -0.1 22.1 28th 6.4 +0.8 -0.5 2nd 76.0 60.8 high 125%
York 17.7 -0.3 22.1 28th 5.1 +1.2 -1.5 2nd 85.3 57.1 v high 149%
South Central (district 10A)
Beverley 17.6 -0.2 23.2 28th 6.0 +0.9 -0.4 2nd 82.0 58.7 high 140%
Brookton 16.7 -0.1 21.5 28th 5.6 +1.0 -0.2 4th 76.6 62.2 high 123%
Corrigin 16.7 +0.3 21.8 28th 5.6 +0.8 0.3 4th
Hyden 17.6 0.0 24.1 28th 5.4 +0.7 -0.2 4th 60.8 40.9 high 149%
Jacup 16.5 -0.3 22.6 29th 5.9 +0.2 1.3 10th 69.4 51.7 high 134%
Katanning 15.4 0.0 21.8 29th 6.7 +0.7 2.4 10th 48.2 59.5 low 81%
Lake Grace 16.3 -0.5 22.1 28th 6.6 +1.0 1.5 4th 44.2 37.3 average 118%
Narembeen 17.4 -0.3 23.0 28th 5.9 +0.5 1.1 17th 84.2 42.0 v high 200%
Narrogin 15.9 +0.6 21.6 28th 6.1 +0.9 0.5 10th 77.8 67.7 average 115%
Newdegate Research Station 16.1 -0.2 21.4 28th 5.7 +1.4 -0.6 18th 52.2 44.6 average 117%
Ongerup 15.9 +0.1 22.6 29th 6.3 +0.4 2.0 10th 48.8 43.2 average 113%
Pingelly 16.5 +0.4 21.2 27th 6.1 +0.4 -1.4 10th 75.4 61.9 high 122%
Ravensthorpe 17.4 +0.1 23.4 29th 6.8 +0.1 1.5 1st 61.9 45.1 high 137%
Wagin 15.9 -0.2 21.8 27th 7.0 +1.3 1.7 10th 68.9 56.8 high 121%
Wandering 16.0 -0.5 20.4 28th 5.9 +1.9 -0.1 4th 138.4 92.1 v high 150%
Eucla (district 11)
Balladonia     31.0 8th 6.3 +1.0 1.0 1st 9.1 21.3 low 43%
Eucla 20.4 +1.2 29.6 9th 8.5 +1.0 1.6 11th 33.8 26.2 high 129%
Eyre 20.7 +1.3 30.7 8th 6.0 0.0 -5.0 12th 37.1 29.4 average 126%
Forrest 21.1 +0.1 29.1 9th 7.2 +1.4 1.4 11th 19.8 13.3 high 149%
Red Rocks Point 19.9 +0.4 30.0 8th 8.8 +0.6 1.9 11th 16.4 39.1 low 42%
South East (district 12)
Bulga Downs 21.1 -1.1 29.4 28th 6.5 +0.5 -2.8 3rd 21.2 15.3 high 139%
Kalgoorlie-Boulder Airport 19.4 +0.7 27.2 8th 7.1 +1.4 0.4 3rd 16.8 21.2 average 79%
Laverton Aero 20.8 0.0 27.7 8th 7.7 +0.5 0.0 3rd 30.4 10.1 v high 301%
Leinster Aero 21.6 -0.1 27.6 8th 8.6 +1.0 -0.4 3rd 14.0 8.8 high 159%
Leonora Aero 20.7 -1.2 27.8 7th 8.0 +0.5 -0.4 3rd 26.4 10.7 v high 247%
Munglinup West 17.9 -0.1 23.4 8th 6.6 -0.3 2.2 10th 55.4 43.5 high 127%
Norseman Aero 19.4 +0.1 27.7 8th 5.7 +1.3 -2.1 18th 26.6 22.8 high 117%
Salmon Gums Res.Stn. 18.3 +0.9 26.2 8th 5.5 +0.8 -3.8 18th 36.8 33.9 high 109%
Southern Cross Airfield 18.3 -0.2 24.9 8th 5.1 +1.4 -1.4 18th 34.8 30.2 average 115%
Yeelirrie 22.8 +1.0 28.4 7th 7.2 +2.5 -1.7 11th 8.5 12.3 average 69%
North East (district 13)
Carnegie 25.6 +1.5 31.9 19th 9.1 +1.8 2.1 3rd 1.6 6.8 average 24%
Giles Meteorological Office 25.7 +3.0 32.0 14th 10.1 +1.4 1.0 4th 0 9.6 lowest 0%
Telfer Aero 30.6 +2.2 36.2 25th 13.9 +1.4 6.0 3rd 0 4.8 lowest 0%
Warburton Airfield 25.6 +2.3 33.0 14th 9.1 +1.9 -0.1 4th 0 9.0 lowest 0%
Wiluna 23.5 +1.6 30.0 30th 9.3 +2.5 0.2 3rd 3.1 9.9 average 31%
Offshore Islands (district 200)
Browse Island 28.7   29.8 28th 25.4   24.3 3rd
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 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 10 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

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