Western Australia in August 2011: Warm days in WA

  • Rainfall: Near average for WA
  • Maximum temperature: 4th warmest on record for WA; 3rd warmest on record for southwest WA
  • Minimum temperature: Near average for WA; above average for southwest WA

Rainfall

August 2011 rainfall was above average in the inland Gascoyne and northern Goldfields, as well as in small pockets of the Kimberley and Southwest Land Division (SWLD). In contrast, below average rainfall was evident in parts of the Pilbara, Interior, Eucla, South Coastal and Southeast Coastal districts (see August 2011 rainfall totals & deciles).

When averaged across the state, August 2011 rainfall was near average. It was also near average for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay).

Widespread rainfall was evident over much of southern WA in the first few days of August, due to a strong westerly flow with embedded fronts crossing the region. Daily rainfall totals up to 30 mm were recorded in the Lower West and Southwest. The Central West and northern Central Wheat Belt districts received significant falls on the 7th, with daily totals generally in the 20-30 mm range. Lynton in the Central West recorded 45.0 mm in 24 hours to 9am on the 8th, the highest daily total for that day. A series of cold fronts brought further moderate to heavy rainfall to southwest and central WA from the 13th to 15th. Cape Leeuwin observed its second wettest August day since records commenced in 1907, and the highest daily total for August 2011 in WA, with 79.0 mm to 9am on the 14th. Most of this rain fell in the afternoon of the 13th as a slow moving line of heavy showers moved over the region and Cape Leeuwin registered 49.2 mm in just two hours, which equates to a one in over 100 year event. Widespread heavy falls occurred in the SWLD on the 21st and early morning on the 22nd, when a strong cold front moved across southwest WA. Many locations registered daily totals over 50 mm, and several sites in the Southwest district experienced their wettest August day on record.

Maximum temperature

With the exception of much the central and eastern Kimberley, mean maximum temperatures in August 2011 were above to very much above average for most of WA, with a broad area of up to 4 °C warmer than normal in the southern Pilbara and northern Gascoyne (see August 2011 mean maximum temperature decile & anomaly maps).

When averaged across the state, August 2011 was the 4th warmest August on record, and the 3rd warmest August on record for the Lower Southwest since records commenced in 1950. This continues the trend in the Lower Southwest that has seen all of the first 8 months of 2011 registering above average mean maxima. As a result, the January to August mean maximum temperature for the Lower Southwest is the highest on record.

During the first week of August, parts of southwest WA experienced cold days (a cold day is when a daily maximum temperature is less than 15°C) due to a persistent and strong westerly flow causing wet weather. Katanning in the Great Southern recorded a daily maximum temperature of 11.2 °C on the 3rd, the lowest temperature of the month for WA.

In the last week of August, northwest WA experienced abnormally hot daytime temperatures. Curtin in the west Kimberley observed 5 consecutive days (27th to 31st) with a daily maximum temperature over 35 °C, which was the longest run of 35 °C or greater days for August at Curtin since 1998, whilst 37.0 °C recorded on the 29th at Curtin was the highest temperature of the month for WA. The unusually high temperatures also had an impact in the Pilbara as the daily maximum temperature of 35.5 °C recorded at Onslow in the Pilbara on the 28th was its hottest August day in 51 years of record. at Whilst at Bidyadanga, the mean maximum temperature of 33.5 °C was its highest August mean maximum temperature on record, exceeding the previous record of 33.1 °C set in August 2006. The Lower West also reported unseasonally high day-time maximum temperatures in August as Perth Metro recorded its equal 2nd warmest August since 1897, and Jurien Bay recorded its warmest August in 41 years of record.

Minimum temperature

Mean minimum temperatures in August 2011 were below to very much below average over much of the Kimberley, with up to 4 °C cooler than normal mean minima in northeastern parts. In contrast, much of southern, central, and western WA saw above to very much above mean minimun temperatures, with parts of the eastern Interior experiencing mean minima up to 4 °C above normal, whilst the western Pilbara, northwest Gascoyne and parts of the Goldfields experienced up to 3°C above normal mean minima (see August 2011 minimum temperature decile & anomaly maps).

When averaged across the state, August 2011 was near average, however, the Lower Southwest register an above average mean minimum. Similar to maximum temperatures, all of the first 8 months of 2011 have seen above average mean minima for the Lower Southwest, and thus the Lower Southwest has recorded its warmest January to August period in terms of mean minimum temperature.

A few chilly nights with sub-zero overnight temperatures were experienced in some locations in the southern half of WA during the early and the latter parts of August. Eyre, in the Eucla, recorded -3.5 °C on the 26th, the coldest night of the month for WA. In contrast, large parts of WA experienced very warm nights during the middle part of August with daily minima over 15 °C. Onslow, Emu Creek and Learmonth Airport in the Pilbara all registered their warmest August night on record on the 14th, whilst Jarrahwood in the Southwest and Ravensthorpe in the Southeast Coastal also recorded their warmest August nights on record on the 21st and 22nd respectively. Pemberton in the Southwest experienced its warmest nights for August on record with a mean minimum temperature of 9.2 °C, exceeding the previous record of 9.1 °C set in August 1941.

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Extremes in August 2011
Hottest day

37.0 °C at Curtin Aero on the 29th

Warmest days on average 33.8 °C at Curtin Aero
Coolest days on average 16.1 °C at Katanning
Coldest day 11.2 °C at Katanning Comparison on the 3rd
Coldest night -3.5 °C at Eyre on the 26th
Coolest nights on average 3.9 °C at York
Warmest nights on average 22.4 °C at Troughton Island
18.4 °C at Truscott (mainland)
Warmest night 24.1 °C at Troughton Island on the 19th
23.3 °C at Argyle Aero (mainland) on the 9th
Wettest overall 213.9 mm at Northcliffe
Wettest day 79.0 mm at Cape Leeuwin on the 14th
Highest wind gust 109 km/h at Cape Leeuwin on the 2nd

Record highest August daily rainfall
Highest daily rainfall
in August 2011 (mm)
Previous highest
for August
Years of
record
Westbourne 69.8 on the 22nd 41.7 on the 4th in 1964 105
Ferguson Valley 67.0 on the 22nd 60.0 on the 23rd in 1982 40
Frankland 64.0 on the 22nd 41.6 on the 3rd in 2003 38




Record highest August temperature
Highest temperature
in August 2011 (°C)
Previous highest
for August
Years of
record
Average for
August
Onslow 35.5 on the 28th 34.0 on the 30th in 1988 51 26.5



Record highest August mean daily maximum temperature
Mean daily maximum
temperature
for August 2011 (°C)
Previous highest
for August
Years of
record
Average for
August
Bidyadanga 33.5 33.1 in 2006 51 30.9
Jurien Bay 21.3 21.2 in 2006 41 19.8




Record highest August daily minimum temperature
Highest daily minimum
temperature
in August 2011 (°C)
Previous highest
for August
Years of
record
Average for
August
Onslow 21.8 on the 14th 20.3 on the 9th in 1992 51 12.5
Ravensthorpe 18.4 on the 22nd 17.0 on the 7th in 2006 49 6.6
Emu Creek Station 21.9 on the 14th 21.3 on the 6th in 1993 39 12.2
Learmonth Airport 20.8 on the 14th 19.7 on the 6th in 1993 37 12.2
Jarrahwood 15.5 on the 21st 14.3 on the 13th in 1976 32 5.1



Record highest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2011 (°C)
Previous highest
for August
Years of
record
Average for
August
Pemberton 9.2 9.1 in 1941 68 7.0



Summary statistics for August 2011
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2011
Diff
from
average
Highest for
August
2011
Mean for
August
2011
Diff
from
average
Lowest for
August
2011
Total for
August
2011
Average
for
August
Rank of
August
2011
Fraction of
August
average
North Kimberley (district 01)
Doongan 30.6 -0.9 33.4 30th 10.1 -2.5 5.9 21st 0 1.1 v low 0%
Kalumburu 33.4 0.0 36.4 29th 13.1 -1.8 9.1 24th 0.6 0.3 high 200%
Mount Elizabeth 29.8 -0.7 32.3 30th 8.3 -1.4 3.8 21st 0 2.0 lowest 0%
Troughton Island 28.9 +0.1 31.0 30th 22.4 -0.2 20.8 3rd 0.4 0.4 average 100%
Truscott 32.0   35.7 30th 18.4   15.8 4th 0.2
Wyndham 32.7 -0.9 34.8 28th 16.1 -2.8 13.0 1st 0 0 lowest
Wyndham Aero 33.7 -0.1 36.7 30th 14.9 -1.5 11.2 24th 0 0.1 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 31.5 -0.5 33.9 29th 16.3 -1.2 11.6 20th 0 0.3 v low 0%
Halls Creek Airport 29.7 -0.3 32.8 16th 13.6 -1.2 9.8 2nd 0 1.9 lowest 0%
Kununurra Aero 32.2 -0.4 34.7 29th 13.5 -2.6 10.9 2nd 0 0.1 lowest 0%
Warmun 31.5 -0.8 34.1 16th 13.3 -1.6 8.0 20th 0 1.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 33.5 +2.6 36.5 29th 14.1 -0.8 10.8 1st 0 2.1 lowest 0%
Broome Airport 31.7 +1.5 36.0 29th 13.7 -1.2 10.4 26th 0.4 1.7 average 24%
Curtin Aero 33.8 +0.8 37.0 29th 14.9 -1.1 11.0 2nd 0 1.8 v low 0%
Cygnet Bay 29.9 +0.2 33.1 28th 13.9 -0.9 10.7 22nd 0 1.1 lowest 0%
Derby Aero 32.6 0.0 35.9 29th 14.3 -1.9 11.0 24th 0 0.8 lowest 0%
Fitzroy Crossing Aero 32.9 -0.4 35.5 31st 12.0 -2.0 9.4 2nd 0 1.3 v low 0%
West Roebuck 33.6 +1.4 36.6 30th 13.0 -0.3 10.1 26th 0 2.9 v low 0%
De Grey (district 04)
Bedout Island 27.0   30.0 29th 20.0   19.0 1st
Karratha Aero                        
Legendre Island 26.8   33.0 29th 18.7   16.4 19th
Mandora 32.7 +2.0 35.7 28th         0 2.5 lowest 0%
Marble Bar 31.8 +2.0 36.0 30th 13.2 0.0 9.6 6th 0 0.3 v low 0%
Pardoo Station 30.9 +0.9 34.5 29th 12.9 -0.7 10.4 19th 0 4.8 lowest 0%
Port Hedland Airport 30.8 +1.7 34.4 29th 13.3 +0.1 10.0 2nd 0 4.9 lowest 0%
Roebourne 31.3 +2.3 35.4 29th 13.5 -1.0 9.9 3rd 9.0 5.1 high 176%
Roebourne Aero 31.0 +1.0 35.8 29th 11.6 -1.2 8.2 2nd 0 1.1 v low 0%
Fortescue (district 05)
Barrow Island Airport 26.4 +1.5 30.5 30th 17.6 -0.2 14.7 7th 2.6 3.1 high 84%
Learmonth Airport 28.4 +2.2 33.0 25th 13.6 +1.4 10.2 8th 12.4 12.7 high 98%
Mardie 31.0 +1.5 35.2 28th 12.7 +0.3 9.7 17th 0 7.4 lowest 0%
Onslow 28.6 +2.1 35.5 28th 15.6 +3.1 13.3 17th 0 8.6 lowest 0%
Onslow Airport 29.2 +2.1 34.7 28th 15.4 +2.0 12.8 19th 0.8 9.5 average 8%
Wittenoom 29.5 +2.8 33.5 29th 13.2 0.0 9.3 19th 0 8.7 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 24.3 +1.4 28.0 21st 12.8 +1.3 6.5 5th 20.0 18.2 average 110%
Denham 22.9 +0.5 26.7 20th 14.7 +1.7 12.2 5th 24.0 22.0 average 109%
Emu Creek Station 30.0 +2.7 34.6 29th 14.4 +2.2 10.3 19th 0.4 11.6 average 3%
Gascoyne Junction 27.3 +2.5 32.8 27th 12.1 +2.1 8.1 6th 8.0 12.0 average 67%
Murchison 23.8 +1.1 30.0 27th 8.5 +1.7 3.4 6th 26.8 20.7 average 129%
Shark Bay Airport 24.2 +0.3 27.9 20th 11.6 +0.8 8.1 6th 23.2 21.2 average 109%
East Gascoyne (district 07)
Newman Aero 28.0 +2.3 32.5 29th 9.2 +1.7 3.4 6th 0 7.7 lowest 0%
Paraburdoo Aero 29.5 +2.3 34.1 29th 12.1 +1.4 8.7 3rd 0 11.9 lowest 0%
Murchison (district 07A)
Meekatharra Airport 23.5 +2.2 30.2 29th 10.1 +1.6 3.6 5th 28.0 11.5 v high 243%
Mount Magnet Aero 22.0 +1.1 29.1 21st 9.0 +1.4 2.3 5th 17.8 17.4 average 102%
North Coast (district 08)
Carnamah 20.1 +1.0 26.2 21st 7.7 +0.5 4.0 6th 71.3 52.5 high 136%
Dalwallinu 18.1 +0.1 25.0 21st 6.5 +0.7 2.3 5th 55.6 37.9 high 147%
Dalwallinu Comparison 19.0 +0.9 25.9 21st         59.3 45.6 high 130%
Eneabba 21.7 +1.1 26.7 21st 9.3 +0.3 5.1 5th 71.4 75.5 average 95%
Geraldton Airport 20.6   24.9 21st 9.0   3.5 27th 70.6
Geraldton Airport Comparison 20.5 +0.4 24.4 21st 9.0 +0.1 3.0 26th 59.4 64.7 average 92%
Kalbarri 23.2 +0.9 26.9 20th 10.7 +0.9 3.8 5th 44.1 49.8 average 89%
Morawa Airport 20.3 +0.4 27.2 21st 6.9 +0.8 3.0 5th 46.2 32.4 high 143%
Mullewa 21.1 +1.0 28.3 21st 8.3 +1.3 4.9 29th 48.4 42.2 average 115%
North Island 21.7 +0.4 24.3 19th 15.4 +0.1 10.2 12th 58.6 35.6 high 165%
Wongan Hills 19.2 +1.4 26.2 21st 7.2 +0.6 2.8 26th 56.4 51.6 average 109%
Central Coast (district 09)
Badgingarra Research Stn 18.5 +0.3 23.7 21st 8.3 +1.4 4.8 27th 92.0 83.8 average 110%
Bickley 16.9 +1.1 23.2 21st 8.3 +0.9 3.0 5th 205.8 169.5 high 121%
Champion Lakes 19.2   25.3 21st 10.3   6.2 4th 54.8
Garden Island HSF 18.7   24.1 21st 12.0   8.4 5th 71.6 88.3 low 81%
Gingin Aero 19.9 +1.1 26.1 21st 7.9 +1.8 2.0 5th 127.0 107.2 average 118%
Gooseberry Hill 18.3 +0.9 24.6 21st 10.1 +0.9 5.4 5th
Gosnells City 20.8 +1.6 27.5 21st         125.7 126.1 average 100%
Jandakot Aero 20.1 +1.7 26.2 21st 8.1 +1.3 2.5 4th 136.2 125.3 average 109%
Jurien Bay 21.3 +1.5 24.0 19th     5.5 17th 64.2 80.0 low 80%
Lancelin 20.5 +1.3 24.7 21st 10.1 +0.2 5.0 5th 75.0 91.7 low 82%
Medina Research Centre                        
Pearce RAAF 19.7 +1.5 25.6 21st 9.0 +0.9 3.7 26th        
Perth Airport 20.2 +1.8 27.0 21st 8.8 +0.8 3.0 4th 128.6 117.3 average 110%
Perth Metro 20.2 +1.4 26.3 21st 9.1 +1.1 3.9 5th 115.2 133.6 average 86%
Rottnest Island 18.7 +1.0 22.5 21st 13.3 +1.1 9.9 5th 58.8 99.3 low 59%
Swanbourne 20.0 +1.4 24.5 21st 10.9 +1.1 5.1 5th 106.2 112.6 low 94%
South Coast (district 09A)
Albany 18.1 +1.8 26.5 21st 7.8 -0.5 2.8 6th 150.6 126.2 high 119%
Albany Airport 17.6 +1.5 25.7 21st 7.9 +0.4 2.7 6th 118.8 107.0 average 111%
Bridgetown 17.2 +0.9 22.9 21st 6.1 +1.3 -0.5 5th
Bridgetown Comparison 18.4 +1.8 24.5 21st 6.2 +1.6 -0.6 6th 116.0 121.1 average 96%
Bunbury 18.4 +1.0 22.1 29th 8.9 +1.5 1.3 4th 112.8 117.7 average 96%
Busselton 18.3 +0.9 22.2 29th 9.8 +1.6 2.1 5th 92.6 113.0 low 82%
Busselton Aero 18.4 +1.3 21.7 29th 8.7 +1.7 1.5 5th 55.2 105.0 v low 53%
Cape Leeuwin 18.0 +1.6 22.5 21st 12.3 +1.1 6.7 6th 158.0 136.3 high 116%
Cape Naturaliste 18.0 +1.6 20.6 20th 11.5 +1.4 6.8 5th 82.0 112.1 low 73%
Collie East 18.0   24.2 21st 5.3   -1.4 6th 159.2
Donnybrook 19.2 +2.0 24.8 21st 7.8 +1.8 1.8 4th 175.1 147.8 high 118%
Dwellingup 17.4 +1.8 24.1 21st 6.4 +0.9 1.2 25th        
Esperance 19.7 +1.9 31.1 21st 9.1 +0.5 6.0 7th 82.6 81.8 average 101%
Esperance Aero 18.5 +1.4 29.5 21st 7.9 +0.3 4.6 27th 45.8 68.2 low 67%
Harvey 18.6 +1.1 24.5 21st 7.8 +0.3 3.0 4th 141.8 132.2 average 107%
Hopetoun North 19.9 +1.0 31.3 21st 8.7 +0.8 4.9 19th 53.8 54.3 average 99%
Jarrahwood 18.3 +1.6 22.0 21st 6.2 +1.1 -1.5 5th 120.4 142.6 low 84%
Mandurah 18.8   23.6 29th 11.8   7.1 4th 88.2 92.8 average 95%
Manjimup 17.1 +2.2 23.2 21st 7.3 +0.9 1.7 5th 136.0 146.3 average 93%
Pemberton 17.6 +2.2 23.5 21st 9.2 +2.2 3.9 5th
Rocky Gully 16.4 +1.2 22.8 21st 7.2 +0.5 1.3 5th 117.8 90.1 high 131%
Shannon 16.6 +1.2 23.0 21st 7.7 +0.9 2.1 5th 147.2 144.8 average 102%
Windy Harbour 18.0 +1.1 22.6 20th 8.8 -0.2 1.5 6th 185.4 161.9 high 115%
Witchcliffe 17.6 +1.0 20.9 21st 9.3 +1.3 1.1 6th 178.4 143.4 high 124%
North Central (district 10)
Cunderdin Airfield 18.5 +0.8 25.5 21st 5.1 +1.0 -0.3 5th 37.0 40.3 low 92%
Kellerberrin 18.8 +1.3 25.8 21st 4.1 -1.3 -1.5 26th 40.6 41.0 average 99%
Merredin 18.7 +1.4 27.2 21st 5.9 +0.5 0.5 5th 43.2 38.8 average 111%
Northam         5.8 +0.2 0.3 5th 62.0 60.7 average 102%
York 18.8 +1.1 25.4 21st 3.9 0.0 -1.5 5th 50.1 56.9 low 88%
South Central (district 10A)
Beverley 19.0 +1.4 25.4 21st 5.9 +0.9 0.2 5th 49.8 58.7 average 85%
Brookton 17.8 +1.1 24.5 21st 5.0 +0.4 -0.9 5th 48.5 62.1 average 78%
Corrigin 17.5 +1.2 25.7 21st 5.7 +1.0 -1.1 5th 43.4 47.4 average 92%
Hyden 19.0 +1.6 28.6 21st 5.4 +0.8 -2.0 26th 33.0 40.6 average 81%
Jacup 18.1 +1.6 27.1 21st 6.3 +0.8 1.1 6th 53.6 46.9 average 114%
Katanning 16.1 +0.9 23.5 21st 6.2 +0.4 1.8 25th 58.8 60.9 average 97%
Katanning Comparison 17.0 +1.5 25.0 21st 5.8 +0.3 -1.2 5th 57.2 62.9 average 91%
Lake Grace 17.7 +1.1 26.9 21st 6.1 +0.7 0.4 5th 27.0 34.4 average 78%
Lake Grace Comparison 17.8 +1.4 26.6 21st 6.3 +0.8 1.0 5th 26.8 39.9 average 67%
Narembeen 18.6 +1.0 27.3 21st         52.5 41.4 high 127%
Narrogin 16.8 +1.6 24.0 21st 6.0 +0.9 -0.6 5th 59.6 67.8 average 88%
Newdegate Research Station 17.1 +1.0 26.1 21st 4.3 +0.2 -1.2 26th 36.6 43.7 average 84%
Ongerup 17.1 +1.4 26.1 21st 6.1 +0.3 1.4 25th 36.2 42.8 average 85%
Pingelly 17.5 +1.5 24.5 21st 6.4 +0.8 1.1 5th 64.4 62.0 average 104%
Ravensthorpe 19.3 +2.1 29.2 21st 8.1 +1.5 3.2 25th 25.8 44.5 low 58%
Wagin 17.2 +1.3 24.6 21st 6.2 +0.6 0.0 5th 50.2 57.0 average 88%
Wandering 17.4 +1.1 25.0 21st 4.9 +1.3 -0.7 5th 100.4 90.1 average 111%
Eucla (district 11)
Balgair 22.8 +2.2 29.6 22nd 6.3 +0.4 0.8 7th 11.1 18.4 average 60%
Balladonia 21.0 +1.8 31.1 22nd 6.5 +1.2 1.4 7th 14.7 21.3 average 69%
Eucla 21.2 +2.1 30.7 24th 8.7 +1.3 3.0 8th 10.8 26.3 low 41%
Eyre 21.4 +2.2 32.0 22nd 7.0 +0.9 -3.5 26th 17.2 29.8 low 58%
Forrest 21.9 +1.2 30.0 24th 6.5 +0.7 2.3 8th 6.0 15.1 low 40%
Red Rocks Point 20.3   30.8 22nd 9.3   4.3 26th 33.0
South East (district 12)
Bulga Downs 23.8   31.2 21st 7.0   -0.1 6th 19.0 15.4 average 123%
Kalgoorlie-Boulder Airport 20.2 +1.6 29.4 21st 7.4 +1.9 1.7 17th 16.4 21.2 average 77%
Laverton Aero 21.9 +1.5 29.5 30th 9.0 +2.0 1.9 17th 11.0 9.6 average 115%
Leinster Aero 22.8 +1.5 29.4 28th 9.4 +2.0 1.7 5th 20.4 9.9 high 206%
Leonora 22.3 +1.7 29.3 21st 8.5 +1.6 2.7 6th 15.1 16.1 average 94%
Leonora Aero 22.3   29.3 21st 8.4   2.4 6th 11.8
Munglinup West 19.3   30.7 21st 7.0   2.8 17th 25.2 37.1 low 68%
Norseman 21.2 +2.8 30.6 21st 5.9 +0.5 0.5 6th 16.5 24.9 average 66%
Norseman Aero 20.7 +1.6 30.8 21st 5.0 +1.0 -1.1 25th 12.8 21.8 low 59%
Salmon Gums Res.Stn. 19.6 +2.3 30.8 21st 5.2 +0.6 -2.8 26th 26.2 33.2 average 79%
Southern Cross Airfield 19.5 +1.2 28.9 21st 5.1 +1.9 -1.2 5th 37.6 29.0 high 130%
Yeelirrie 23.2 +1.7 29.9 28th 6.0 +1.3 -2.2 6th 20.5 12.9 high 159%
North East (district 13)
Carnegie 26.1 +2.3 33.0 30th 7.2 +0.1 1.4 5th 0.6 7.5 average 8%
Giles Meteorological Office 25.3 +2.8 30.4 31st 9.5 +0.8 2.1 6th 0 10.4 lowest 0%
Telfer Aero 29.7 +1.4 34.0 31st 12.3 -0.2 9.3 18th 0.2 5.6 average 4%
Warburton Airfield 25.6 +2.6 32.6 31st 7.6 +0.5 0.6 17th 2.0 10.0 average 20%
Wiluna 24.1 +2.3 31.0 29th 9.3 +2.5 1.7 6th 25.2 10.3 high 245%

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 Thursday 1 September 2011. 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.
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.

Records in this summary are based on sites with at least 30 years of data.

For PDF files of Perth Metro climate statistics for other months, please click here for extremes and here for averages.

Further information

Media
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