Western Australia in August 2013: Second warmest August on record

  • Rainfall: below average rainfall for WA, near average for southwest WA
  • Maximum temperature: 2nd warmest for WA, 4th warmest for southwest WA
  • Minimum temperature: above average for WA, 3rd warmest for southwest WA

Rainfall

Rainfall in August 2013 was below to very much below average over most of the Pilbara, Gascoyne, Goldfields, Northern and Southern Interior, and Eucla. Much of the Kimberley and Southwest Land Division (SWLD) reported near average August rainfall, although very light rainfall in the far north Kimberley in the middle of the month brought above average totals, given it rains rarely in the region in August. Small areas of the SWLD also recorded above to very much above average rainfall, particularly near the west and south coasts.

For WA as a whole, rainfall in August 2013 was below average, however averaged across the the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), as well as for the wider SWLD region, rainfall during August 2013 was near average.

A weak cold front brushed through the southwest corner of WA on the first day of August, bringing generally light showers to parts of the SWLD, with some moderate falls in the Southwest, Lower West, and South Coastal districts. Northwesterly winds over the SWLD from the 4th to the 8th along with a slow moving cloudband and a cold front brought persistent showery conditions to much of the SWLD, with moderate to heavy falls reported in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) intially and extending through the SWLD on the 7th and 8th. Daily rainfall of 80.2 mm at Bickley (Perth hills) on the 8th was the highest daily rainfall of the month in WA, and it was the second wettest day in August at Bickley in 45 years of record, and the wettest day at the site for any month for over 12 years, since 137.0 mm was recorded on 30 July 2001. Gingin in the Lower West recorded a daily total of 52.8 mm, also on the 8th, which was the wettest day in August at the site in 107 years of record. The previous record at Gingin was 52.3 mm on 11 August 1944.

Light to moderate rainfall continued in the southwest of WA between the 9th and 14th under a persistent westerly airstream with embedded weak cold fronts. A strong cold front moved through southern WA on the 15th and 16th brining widespread rainfall to the SWLD and neighbouring parts of the Gascoyne, Goldfields, and Eucla. Esperance in the Southeast Coastal recorded a daily total of 47.2 mm on the 16th, the wettest August day in 45 years of recording at the site, exceeding the previous record of 40.2 mm on 27 August 2002, whilst Merivale Farm (Southeast Coastal) recorded a daily rainfall of 52.4 mm on the 16th, exceeding the previous highest August daily fall in its 31 years of record of 38.0 mm. A complex low pressure system and upper level trough moved through southern WA on the 25th and 26th bringing widespread rainfall to much of the SWLD, southern Gascoyne, and Goldfields, with moderate to heavy falls in the Central West, Lower West, and Southwest, followed by another low pressure system on the 27th and morning of the 28th, that brought further widespread rainfall to the SWLD and southern Gascoyne. A westerly stream prevailed over the SWLD from the 29th for the remainder of the month as weak cold fronts moved through the region bringing widespread rainfall with some moderate falls to western parts of the Division.

Maximum temperature

Very much above average mean maximum temperatures were observed across almost all of WA in August 2013, with areas over 4 °C warmer than normal in the southeast Northern Interior and the eastern coastal Eucla. Carnarvon Airport in the Gascoyne and a few sites in the Lower West observed their warmest or equal warmest August on record, including Perth Metro and Rottnest Island, with 116 and 115 years of record respectively. Only parts of the Pilbara coast recorded a near average August in terms of the mean maximum temperature.

Averaged across the state as a whole, the mean maximum temperature for WA in August 2013 was the second warmest from comparable records commencing in 1910. For the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) the mean maximum temperature was the fourth warmest on record.

A high moving over WA from the west in the early days of August 2013 produced a warming trend near the west coast, which resulted in unusually high temperatures in the west Gascoyne on the 3rd. Carnarvon Airport recorded its equal warmest day in August on record with a maximum of 31.6 °C, equal with the same maximum recorded on 11 August 1988. The unusually warm conditions extended through the southern half of WA on the 4th, and persisted until the 9th when the unusually high temperatures became confined to eastern central parts of the State where they continued until the 12th. Unusually hot days were reported in parts of the Kimberley and Northern Interior from the 12th to the 21st with daily maxima in the mid-to-high thirties at times. Warmun in the east Kimberley recorded a daily maximum of 39.5 °C on the 20th, which was the highest temperature in August 2013 in WA, and the highest August temperature at Warmun in 52 years of record, exceeding the previous record of 39.0 ºC on 31 August 2009. It was also the equal fourth highest temperature recorded in August in WA, only behind 40.0 ºC at Kalumburu Mission on 27 August 1970, 39.7 ºC at Wyndham Aerodrome on 31 August 2009, 39.6 ºC at Wyndham on 31 August 1985, and equal with 39.5 ºC at Derby Post Office on 24 August 1989.

Unusually warm days were evident in parts of the west Gascoyne and western SWLD from the 22nd to the 24th, whilst very warm days were reported in the Southern Interior and Eucla from the 25th to the end of the month.

Minimum temperatures

Most of the southern half of WA, west Gascoyne, west Pilbara, and Northern Interior saw above to very much above average mean minimum temperatures in August 2013 with a number of sites in the SWLD recording their highest mean minimum on record . Mean minima up to 3 °C warmer than normal were recorded in the southern half of the SWLD and parts of the Northern Interior. Cape Leeuwin in the Southwest recorded a mean minimum of 13.5 °C, which was its highest August mean minimum in 116 years of record and 0.5 °C higher than the previous record in August 2006, as the result of warmer than normal sea surface temperatures near southwest WA. In contrast, below to very much below average mean minimum temperatures occurred in parts of the Kimberley, with means up to 3 °C cooler than normal reported.

Averaged across the state as a whole, the mean minimum temperature for WA in August 2013 was above average, whilst averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) the mean minimum temperature was the third warmest on record.

Cold nights were reported at various sites in the north and east Kimberley under clear skies and in very dry air between the 4th and 10th, with daily minima below 10.0 °C. Kununurra Aerodrome recorded a minimum of 7.0 °C on the 6th, overtaking its previous lowest temperature in August in 26 years of record of 7.3 °C registered on both 3 and 14 August 2012.

Mild nights were observed across large parts of the SWLD from the 5th to the 8th due to generally northwesterly winds and cloudy skies. Several sites in the Lower West and neighbouring Great Southern and Central Wheat Belt recorded their highest August minimum temperature on record on the 7th or 8th as a result. Perth Metro recorded a daily minimum 17.1 °C on the 7th, which was its warmest night in August since records commenced in 1897. The previous August record of 17.0 °C was observed exactly seven years previously on 7 August 2006.

Cold nights were experienced in parts of southern WA from the 11th to the 25th as a result of clear skies and light winds, with daily minima below 5.0 °C and a number of sites recording sub-zero temperatures. Eyre recorded the lowest temperature in the State on the 21st with a minimum of -1.8 ºC.

Other Phenomena

A suspected waterspout crossed the Perth metropolitan coast near North Coogee on the 6th, causing injury to 6 people (two serious) when scaffolding on a building site collapsed. Buildings were damaged and a heavy concrete building slab was lifted up.

Further information

Media
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Extremes in August 2013
Hottest day 39.5 °C at Warmun on the 20th
Warmest days on average 35.5 °C at Wyndham Aero
Coolest days on average 16.1 °C at Manjimup
16.1 °C at Rocky Gully
Coldest day 11.9 °C at Manjimup on the 15th
Coldest night -1.8 °C at Eyre on the 21st
Coolest nights on average 4.7 °C at Yeelirrie
Warmest nights on average 25.3 °C at Browse Island
19.0 °C at Troscott
Warmest night 26.6 °C at Browse Island on the 22nd
24.4 °C at Wyndham Aero on the 23rd
Wettest overall 325.0 mm at Mount William
Wettest day 80.2 mm at Bickley on the 8th
Highest wind gust 111 km/h at Cape Naturaliste on the 15th

Maps

Maps
Observed Anomaly Decile 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

Record highest August daily rainfall
Highest daily rainfall
in August 2013 (mm)
Previous wettest
for August
Years of
record
Gingin 52.8 on the 8th 52.3 on the 11th in 1944 107
Esperance 47.2 on the 16th 40.2 on the 27th in 2002 45
Merivale Farm 52.4 on the 16th 38.0 on the 11th in 1999 31



Record highest August temperature
Highest temperature
in August 2013 (°C)
Previous warmest
for August
Years of
record
Average for
August
Carnarvon Airport 31.6 on the 3rd = 31.6 on the 11th in 1988 67 23.0
Warmun 39.5 on the 20th 39.0 on the 31st in 2009 52 32.3



Record highest August mean daily maximum temperature
Mean daily maximum
temperature
for August 2013 (°C)
Previous warmest
for August
Years of
record
Average for
August
Carnarvon Airport 25.4 = 25.4 in 1987 66 23.0
Perth Metro 20.4 20.3 in 1902 116 18.9
Pearce RAAF 20.2 = 20.2 in 2006 52 18.3
Rottnest Island 19.4 19.2 in 2006 115 17.8



Record highest August daily minimum temperature
Highest daily minimum
temperature
in August 2013 (°C)
Previous warmest
for August
Years of
record
Average for
August
Perth Metro 17.1 on the 7th 17.0 on the 7th in 2006 116 8.0
Northam 14.7 on the 8th 14.5 on the 17th in 1999 104 5.6
Dwellingup 14.3 on the 8th 14.1 on the 3rd in 1983 54 5.4
Pearce RAAF 16.3 on the 7th 16.2 on the 23rd in 1966 54 8.1
Karnet 14.4 on the 8th 14.0 on the 26th in 1994 48 6.2
Brookton 13.8 on the 7th 13.4 on the 25th in 1970 46 4.6



Record highest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2013 (°C)
Previous warmest
for August
Years of
record
Average for
August
Cape Leeuwin 13.5 13.1 in 2006 116 11.2
Cape Naturaliste 12.1 12.0 in 2006 109 10.1
Albany 10.9 10.3 in 2007 95 8.3
Dwellingup 8.3 8.2 in 1998 75 5.4
Manjimup 8.6 8.4 in 1998 73 6.5
Pemberton 9.6 9.1 in 2011 70 7.0
Bencubbin 8.2 = 8.2 in 2011 61 5.9
Karnet 8.8 8.6 in 1983 47 6.2
Ongerup 8.3 7.7 in 1998 45 5.8
Esperance 10.6 9.9 in 1998 44 8.6
Narembeen 7.8 7.6 in 1983 42 5.2
Wagin 8.5 8.0 in 1998 39 5.6



Summary statistics for August 2013
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2013
Diff
from
average
Highest for
August
2013
Mean for
August
2013
Diff
from
average
Lowest for
August
2013
Total for
August
2013
Average
for
August
Rank of
August
2013
Fraction of
August
average
North Kimberley (district 01)
Doongan 33.0 +1.5 36.1 20th 12.0 -0.3 4.6 6th 0 1.0 v low 0%
Kalumburu 34.5 +1.1 37.1 14th 13.8 -0.8 8.0 5th        
Mount Elizabeth 32.3 +1.8 36.0 21st 7.9 -1.6 1.6 6th 0 1.9 lowest 0%
Troughton Island 29.6 +0.8 31.0 23rd 23.2 +0.7 20.8 10th 0.4 0.6 average 67%
Truscott 32.2   33.6 21st 19.0   14.5 10th 0.6 0.6 average 100%
Wyndham 34.6 +1.1 37.1 14th 17.6 -1.2 11.4 6th 0 0 lowest
Wyndham Aero 35.5 +1.7 38.0 21st 16.6 +0.5 10.6 7th 0 0.1 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 34.3 +2.3 39.2 20th 18.1 +0.8 12.5 6th 0 0.2 v low 0%
Halls Creek Airport 32.3 +2.3 36.6 20th 15.2 +0.4 7.8 6th 0 1.9 lowest 0%
Kununurra Aero 34.8 +2.2 37.9 31st 13.4 -2.5 7.0 6th 0 0.1 lowest 0%
Warmun 34.3 +2.0 39.5 20th 14.5 -0.4 7.5 6th 0 1.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 32.2 +1.2 35.0 19th 14.2 -0.7 8.0 6th 0 2.1 lowest 0%
Broome Airport 30.7 +0.4 35.3 19th 14.5 -0.4 8.9 5th 0.4 1.7 average 24%
Curtin Aero 34.5 +1.4 37.3 20th 15.0 -0.8 8.2 8th 0 1.7 v low 0%
Derby Aero 33.4 +0.8 38.1 20th 14.2 -1.8 7.0 5th 0 0.8 lowest 0%
Fitzroy Crossing Aero 35.2 +1.9 38.5 18th 13.3 -0.4 6.9 6th 0 1.2 v low 0%
Lombadina Airstrip 30.7   35.3 20th 16.4   9.8 5th 0.6
De Grey (district 04)
Bedout Island 26.3   27.3 16th 20.8   18.5 8th
Karratha Aero 29.1 +0.9 31.2 9th 13.8 -0.5 10.1 6th 0.2 4.6 average 4%
Legendre Island 26.9   29.1 8th 18.5   16.9 7th
Mandora 32.3 +1.5 34.8 20th 13.4 +0.1 6.7 6th 0.2 2.5 high 8%
Marble Bar 31.0 +0.8 33.4 15th 12.4 -0.7 7.9 5th 0 0.3 v low 0%
Pardoo Station     34.0 29th 13.4 -0.1 10.1 6th 0 4.7 lowest 0%
Port Hedland Airport 30.7 +1.5 33.7 20th 13.1 0.0 9.4 1st 0.2 4.8 low 4%
Roebourne 31.2 +2.1 33.1 9th 13.9 -0.6 10.5 7th 0 4.9 lowest 0%
Roebourne Aero 30.8 +0.5 32.3 10th 11.5 -1.1 7.3 7th 0.2 1.0 average 20%
Fortescue (district 05)
Barrow Island Airport 25.6 +0.5 29.7 14th 17.7 -0.1 14.4 6th 0.8 2.9 low 28%
Christmas Creek 28.4   30.8 27th 10.4   6.1 18th 0
Fortescue Dave Forrest 28.4   30.6 15th 11.0   6.5 18th 0
Learmonth Airport 27.2 +0.9 32.4 20th 11.4 -0.8 8.7 3rd 0.2 12.3 low 2%
Mardie 30.0 +0.5 33.1 20th 12.1 -0.3 10.0 8th 0 7.3 lowest 0%
Onslow Airport 28.7 +1.5 33.1 20th 14.4 +0.9 12.0 3rd 0.4 9.1 low 4%
Wittenoom 29.4 +2.6 31.7 15th 13.0 -0.2 8.9 5th 0 8.4 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 25.4 +2.4 31.6 3rd 12.2 +0.6 7.6 24th 0.2 17.7 lowest 1%
Denham 23.8 +1.4 30.2 23rd 13.8 +0.6 11.4 4th 7.0 21.7 low 32%
Emu Creek Station 29.3 +1.8 33.1 20th 12.4 +0.1 10.1 3rd 0 11.3 lowest 0%
Murchison 24.6 +1.7 29.0 7th 7.9 +1.0 4.0 17th 9.2 19.7 average 47%
Shark Bay Airport 25.5 +1.5 30.6 24th 11.5 +0.6 5.8 5th 5.8 19.1 v low 30%
East Gascoyne (district 07)
Newman Aero 27.9 +1.9 31.3 15th 8.6 +0.9 4.8 2nd 0 7.3 lowest 0%
Paraburdoo Aero 28.9 +1.4 31.8 20th 10.9 0.0 7.9 29th 0 11.3 lowest 0%
Murchison (district 07A)
Meekatharra Airport 23.5 +2.1 27.8 7th 8.8 +0.3 4.0 17th 0 11.1 lowest 0%
Mount Magnet Aero 23.0 +1.9 28.7 7th 8.8 +1.1 5.7 17th 7.2 16.2 average 44%
Paynes Find 22.1 +2.1 27.7 7th 7.3 +1.5 3.8 12th 27.8 27.1 average 103%
North Coast (district 08)
Carnamah 20.7 +1.6 28.2 24th 8.2 +1.0 4.3 16th 55.3 52.3 average 106%
Dalwallinu 19.1 +1.0 26.2 24th 7.5 +1.6 3.2 14th 53.0 37.6 high 141%
Geraldton Airport 22.2   30.1 24th 9.6   3.5 20th 72.6
Kalbarri 24.3 +2.0 29.4 23rd 10.7 +0.9 5.4 22nd 37.7 49.4 average 76%
Morawa Airport 21.7 +1.6 28.1 24th 7.2 +1.0 3.5 23rd 44.6 32.4 high 138%
Mullewa 22.2 +2.1 29.0 24th 8.7 +1.6 5.9 15th 44.4 42.0 average 106%
North Island 22.8 +1.4 26.4 23rd 16.4 +1.1 13.2 10th 27.2 34.5 average 79%
Wongan Hills 19.5 +1.6 26.5 24th 8.3 +1.7 3.8 16th 51.8 51.5 average 101%
Central Coast (district 09)
Badgingarra Research Stn 18.6 +0.4 25.2 24th 8.3 +1.3 4.6 16th 117.2 84.8 high 138%
Bickley 16.9 +1.0 23.1 24th 9.5 +2.0 4.6 16th 297.4 172.4 v high 173%
Champion Lakes 19.2   24.4 24th 11.4   6.3 16th 173.6
Garden Island HSF 19.2 +1.2 21.9 23rd 13.1 +2.1 7.9 28th 125.2 91.3 high 137%
Gingin Aero 19.9 +1.0 26.7 24th 8.7 +2.4 2.8 24th 172.6 109.8 v high 157%
Gosnells City 20.8 +1.5 26.9 24th     6.1 20th 156.1 126.2 high 124%
Jandakot Aero 19.8 +1.2 25.0 24th 9.9 +3.0 3.3 24th 194.6 126.4 v high 154%
Jurien Bay 21.2 +1.3 25.5 23rd 11.0 +1.7 6.0 22nd 132.6 81.5 v high 163%
Karnet 17.1 +1.2 22.4 24th 8.8 +2.6 3.6 16th 289.4 186.8 v high 155%
Lancelin 20.8 +1.5 25.0 23rd         105.6 91.1 high 116%
Medina Research Centre         10.7 +2.7 5.1 20th        
Pearce RAAF 20.2 +1.9 26.2 24th 9.4 +1.3 4.6 16th 140.7 104.5 high 135%
Perth Airport 20.3 +1.8 26.1 24th 9.9 +1.9 3.9 20th 151.0 117.8 high 128%
Perth Metro 20.4 +1.5 26.4 24th 10.7 +2.7 5.7 20th 167.4 133.1 high 131%
Rottnest Island 19.4 +1.6 22.9 23rd 14.0 +1.7 10.1 16th 94.0 99.3 average 95%
Swanbourne 20.2 +1.5 23.7 24th 12.2 +2.3 8.0 23rd 164.2 115.5 v high 142%
South Coast (district 09A)
Albany 17.7 +1.4 22.6 31st 10.9 +2.6 5.7 16th 203.8 126.6 v high 161%
Albany Airport 17.6   22.9 24th 9.3   2.4 19th 136.4
Bridgetown 16.9 +0.5 21.6 24th 7.1 +2.3 2.1 14th 145.4 113.1 high 129%
Bunbury 18.4 +0.9 21.8 4th 10.1 +2.7 4.8 16th 132.8 116.7 average 114%
Busselton Aero 18.1 +0.9 20.8 24th 9.2 +2.2 4.3 18th        
Cape Leeuwin 17.6 +1.2 20.6 23rd 13.5 +2.3 10.0 16th 138.6 136.0 average 102%
Cape Naturaliste 18.0 +1.6 20.9 24th 12.1 +2.0 6.8 16th 168.4 112.4 v high 150%
Collie East 17.4 +0.3 23.0 24th 7.2 +2.8 1.1 20th 155.0 116.8 average 133%
Donnybrook 18.3 +1.1 22.7 24th 8.5 +2.5 4.4 20th 216.6 148.1 high 146%
Dwellingup 17.0 +1.4 22.4 24th 8.3 +2.9 2.3 20th 244.8 193.4 high 127%
Esperance 19.1 +1.2 26.2 24th 10.6 +2.0 5.6 16th 145.0 83.7 v high 173%
Esperance Aero 18.9 +1.7 25.1 24th 9.4 +1.7 4.8 16th 67.2 68.1 average 99%
Harvey 18.8 +1.2 23.0 24th 9.6 +2.1 4.5 16th 213.2 137.2 v high 155%
Hopetoun North 19.7 +0.7 26.9 24th 10.6 +2.6 4.8 14th 54.8 53.0 average 103%
Jarrahwood 17.7 +0.9 22.2 24th 7.6 +2.5 2.0 20th 244.8 144.5 v high 169%
Mandurah 19.0 +1.1 21.1 23rd 12.9 +2.1 8.7 16th 91.8 92.6 average 99%
Manjimup 16.1 +1.1 21.7 24th 8.6 +2.1 3.4 16th 139.6 145.9 average 96%
North Walpole 16.8   20.7 24th 10.6   6.0 16th 257.6
Pemberton 16.5 +1.0 20.7 24th 9.6 +2.6 5.2 16th 211.6 168.9 high 125%
Rocky Gully 16.1 +0.8 21.8 24th 8.3 +1.6 3.4 16th 2.8 85.7 v low 3%
Windy Harbour 17.4 +0.4 20.5 24th 11.0 +2.0 6.5 19th        
Witchcliffe 17.5 +0.8 20.6 24th 10.2 +2.2 5.6 20th 209.2 149.5 v high 140%
North Central (district 10)
Bencubbin 19.0 +1.3 25.6 24th 8.2 +2.3 3.7 16th 47.1 37.2 high 127%
Cunderdin Airfield 19.1 +1.2 26.2 24th 6.3 +2.1 -0.2 23rd 39.0 40.0 average 98%
Kellerberrin 19.4 +1.8 26.0 24th 6.0 +0.6 0.0 23rd 38.6 40.9 average 94%
Merredin 19.5 +2.2 26.1 24th 7.0 +1.6 1.9 22nd 40.4 38.7 average 104%
Northam 19.5 +1.5 25.9 24th 7.4 +1.8 2.3 23rd 80.1 60.8 high 132%
York 19.2 +1.4 24.8 24th 5.6 +1.8 -1.0 23rd 65.4 56.1 average 117%
South Central (district 10A)
Beverley 19.6 +1.9 25.0 24th 6.9 +1.9 1.6 23rd 59.6 58.5 average 102%
Brookton 18.3 +1.5 23.6 24th 6.4 +1.8 1.2 14th 60.7 61.9 average 98%
Corrigin 18.3 +1.9 25.0 24th 6.9 +2.2 1.8 14th 53.2 47.3 average 112%
Hyden 18.7 +1.2 25.5 24th 7.0 +2.4 1.4 14th 52.2 40.6 high 129%
Jacup 18.3 +1.6 24.7 24th 7.9 +2.3 2.3 16th
Katanning 16.5 +1.2 22.3 24th 8.1 +2.3 3.0 16th
Lake Grace 18.1 +1.4 24.5 24th 7.6 +2.2 1.4 14th 25.6 33.5 average 76%
Narembeen 18.7 +1.1 25.6 24th 7.8 +2.6 3.0 20th 53.5 41.5 high 129%
Narrogin 17.4 +2.1 22.8 24th 7.5 +2.4 1.4 14th 66.8 67.6 average 99%
Newdegate Research Station 17.4 +1.2 23.0 24th 6.7 +2.6 -0.6 14th 42.8 43.4 average 99%
Ongerup 17.3 +1.6 23.5 24th 8.3 +2.5 2.5 19th 59.4 42.9 high 138%
Pingelly 18.1 +2.1 23.0 24th 7.2 +1.6 1.9 16th 65.6 61.8 average 106%
Ravensthorpe 18.6 +1.4 26.0 24th 8.5 +1.8 3.9 14th 31.0 44.3 average 70%
Wagin 17.4 +1.4 23.4 24th 8.5 +2.9 3.1 16th 52.2 56.8 average 92%
Wandering 17.7 +1.3 23.8 24th 7.1 +3.4 0.8 14th 81.6 88.5 average 92%
Eucla (district 11)
Balladonia 21.2 +2.0 26.7 7th 6.5 +1.2 2.5 20th 11.2 21.1 low 53%
Eucla 22.9 +3.8 31.5 8th 8.5 +1.1 3.9 21st 2.4 26.0 v low 8%
Eyre 22.3 +3.0 29.6 25th 5.7 -0.4 -1.8 21st 4.7 29.2 v low 16%
Forrest 23.4 +2.6 31.8 8th 6.8 +1.1 1.9 20th 3.4 14.2 low 24%
Red Rocks Point 21.8   29.7 8th 8.6   4.7 20th 10.8 40.6 v low 27%
South East (district 12)
Bulga Downs 23.3 +1.1 28.5 8th 6.5 +0.6 3.0 19th 2.6 15.1 low 17%
Kalgoorlie-Boulder Airport 20.9 +2.3 26.5 8th 7.2 +1.6 3.3 22nd 10.6 20.8 low 51%
Laverton Aero 23.2 +2.6 28.6 8th 8.0 +0.9 2.8 17th 0 8.7 v low 0%
Leinster Aero 23.2 +1.7 28.6 8th 8.5 +1.0 4.6 17th 0 8.9 v low 0%
Leonora 23.0 +2.3 28.2 8th 8.2 +1.2 3.9 17th 1.0 15.9 v low 6%
Leonora Aero 23.2   28.9 8th 8.2   3.9 18th 0.2
Munglinup West 18.6 +0.7 26.0 24th 8.5 +1.8 3.0 14th 49.2 38.1 average 129%
Norseman Aero 20.0 +0.7 26.1 7th 6.2 +2.1 0.7 14th 26.8 21.3 high 126%
Salmon Gums Res.Stn. 19.5 +2.1 25.7 24th 6.6 +2.0 -0.7 20th 25.6 32.9 average 78%
Southern Cross Airfield 19.9 +1.4 26.3 7th 6.3 +2.9 1.6 22nd 36.4 28.7 high 127%
Yeelirrie 24.2 +2.6 28.7 8th 4.7 0.0 0.8 17th 0.2 12.6 low 2%
North East (district 13)
Balgo Hills 32.2 +3.3 36.4 19th 16.2 +2.0 11.4 5th 0 3.2 lowest 0%
Giles Meteorological Office 26.0 +3.4 31.6 28th 9.8 +1.1 3.9 17th 0 10.0 lowest 0%
Telfer Aero 30.3 +1.9 33.6 27th 13.7 +1.2 9.0 5th 0 5.3 lowest 0%
Warburton Airfield 26.3 +3.2 31.0 11th 8.0 +0.9 0.2 17th 0 9.7 lowest 0%
Wiluna 24.7 +2.8 29.7 25th 7.4 +0.6 2.9 17th 0 10.1 lowest 0%
Offshore Islands (district 200)
Adele Island 28.3   30.0 19th 23.9   21.7 4th
Browse Island 28.3   29.9 22nd 25.3   21.9 24th
Christmas Island Aero 26.3 +0.3 27.0 10th 22.8 +0.6 21.2 1st 34.6 41.9 average 83%
Cocos Island Airport 28.1 0.0 29.0 14th 24.7 +0.8 22.2 21st 69.6 120.9 average 58%

Notes

A Monthly Climate Summary is prepared to list 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. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

This statement has been prepared based on information available at 11 am on Monday 2 September 2013. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

Further information

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