Western Australia in October 2010: Very dry in southwest WA

  • 5th wettest October for WA, but 7th driest in the Lower Southwest
  • Mean maximum temperature near average for WA, but 5th highest in the Lower Southwest
  • Mean minimum temperature near average for WA, but below average in the Lower Southwest

Rainfall

Much drier than normal conditions continued in southwest WA with October 2010 ranking as 7th driest October on record in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay). Comparable records began in 1900. Below to very much below average rainfall was also recorded in a small pocket of the northern Goldfields. Above to very much above average October rainfall occurred in the Kimberley, Interior, and adjacent inland Pilbara and Gascoyne. When averaged across the state as a whole, rainfall for October 2010 ranked as the fifth wettest on record (see October rainfall totals & decile maps) despite the very dry conditions in the Lower Southwest.

A series of thunderstorm events brought moderate to heavy downpours to various locations in the Kimberley during the first half and the latter part of October. Daily totals were generally 30 to 50 mm, with some heavy falls over 90 mm. A fall of 121.2 mm at Faraway Bay in the far north Kimberley on the 14th was the second wettest October day on record in the Kimberley. Some locations recorded their wettest October day on record and several locations recorded their wettest total October rainfall on record as the result.

In contrast, the southern half of the state failed to register any significant rainfall in October. Several fronts brought showers to much of southern WA, however daily totals were generally less than 10 mm, apart from near the south coast where monthly totals over 50 mm were reported. Several locations in the Central West, Central Wheat Belt and Great Southern districts experienced their driest October on record.

A very dry year has been recorded in 2010 in southwest WA. Very much below average rainfall during summer (2009/10); below average rainfall in autumn; the driest winter on record; and very much below average rainfall in September and October has culminated in the lowest January to October rainfall on record for the Lower Southwest region.

Maximum temperature

Mean maximum temperatures were below to very much below average in much of the eastern WA, with means up to 4 °C below normal in the east Kimberley and eastern Interior. In contrast, western WA saw above to very much above average mean maximum temperatures, with up to 4 °C above normal mean maxima in the west Gascoyne (see October maximum temperature decile & anomaly maps). When averaged over the whole state, October 2010 was near average in terms of mean maximum temperature, however the Lower Southwest of WA experienced its 5th hottest October on record (comparable records began in 1950).

Several locations in the Gascoyne, Central West and Central Wheat Belt districts had their highest mean maximum temperature on record whilst a couple of sites in the northern Kimberley had their lowest mean maximum temperature on record.

Minimum temperature

Mean minimum temperatures were below to very much below average in parts of the southeast Kimberley and far northeast Interior, as well as the Southwest district, with up to 3 °C below normal means in the southeast Kimberley and far northeast Interior. In contrast, a broad area of above to very much above average mean minima extended through most of the Pilbara, Gascoyne, as well as northern parts of the Goldfields and southern Interior, with up to 5 °C above normal mean minima in the northwest Gascoyne (see October minimum temperature decile & anomaly maps). When averaged over the whole state, mean minimum temperatures in October 2010 were near average.

Eyre in the Eucla district recorded a minimum temperature of -3.6 °C on the 8th, which was their coldest night for eight years, and the third coldest October night on record in WA. In contrast, a cloudy night on the 27th after a warm to hot day on the 26th in the Southwest Land Division (SWLD) and Goldfields saw several locations in the Central Wheat Belt and Goldfields registering their highest daily minimum temperature for October on record.

As the result of many cloudless and calm nights, Albany Airport in the South Coastal experinced their coldest October on record in terms of mean minimum temperature. In contrast, several towns in the west Pilbara and northern Gascoyne registered their warmest October nights on record.

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Extremes in October 2010
Hottest day 42.7 °C at Marble Bar on the 24th
Warmest days on average 37.7 °C at Roebourne
Coolest days on average 19.5 °C at North Walpole
Coldest day 13.0 °C at Shannon on the 14th
Coldest night -3.6 °C at Eyre on the 8th
Coolest nights on average 4.1 °C at Bridgetown
Warmest nights on average 27.0 °C at Troughton Island
25.4 °C at Wyndham (mainland)
Warmest night 28.9 °C at Telfer Aero on the 24th
Wettest overall 224.0 mm at Warmun
Wettest day 121.2 mm at Faraway Bay on the 14th
Highest wind gust 93 km/h at Forrest on the 28th

Record highest October daily rainfall
Highest daily rainfall
in October 2010 (mm)
Previous highest
for October
Years of
record
Fossil Downs 31.2 on the 14th 30.0 on the 6th in 2009 98
Jubilee Downs 36.0 on the 14th 35.0 on the 21st in 1996 70
Mount Barnett 93.8 on the 13th 87.6 on the 8th in 1911 44
Mount Elizabeth 52.2 on the 31st 44.4 on the 17th in 1975 38
Kununurra Aero 52.4 on the 8th 44.8 on the 31st in 1999 36



Record highest total October rainfall
Total rainfall
for October 2010 (mm)
Previous highest
for October
Years of
record
Average for
October
Warmun 224.0 132.9 in 2000 102 23.5
Fossil Downs 85.2 77.5 in 1916 100 7.4
Moola Bulla 91.2 83.6 in 1975 97 14.1
Gibb River 144.0 141.0 in 1975 84 21.0
Jubilee Downs 84.2 42.6 in 1996 72 6.6
Kuri Bay 98.9 62.2 in 1996 46 8.9
Mount Barnett 177.4 100.6 in 1916 44 22.6
Wyndham 160.6 107.2 in 1996 43 22.6
Mount Elizabeth 151.4 101.6 in 1975 38 28.3
Kununurra Aero 135.0 82.2 in 1999 36 22.5
Brooking Springs 31.8 27.4 in 1996 30 8.0


Record lowest total October rainfall
Total rainfall
for October 2010 (mm)
Previous lowest
for October
Years of
record
Average for
October
Dalwallinu Comparison 0.4 0.5 in 1969 99 16.7
Hyden 0.2 0.4 in 2000 82 21.5
Newdegate Research Station 0.6 2.4 in 2000 55 23.0
Kalbarri 0.4 0.8 in 2006 40 14.4


Record highest October mean daily maximum temperature
Mean daily maximum
temperature
for October 2010 (°C)
Previous highest
for October
Years of
record
Average for
October
Carnarvon Airport 29.1 28.5 in 1997 64 25.9
Wagin 24.5 23.7 in 2006 36 21.7
Kalbarri 29.3 28.5 in 1982 35 26.1


Record lowest October mean daily maximum temperature
Mean daily maximum
temperature
for October 2010 (°C)
Previous lowest
for October
Years of
record
Average for
October
Warmun 35.0 35.4 in 1966 47 38.7
Wyndham 35.9 36.7 in 2000 42 38.9


Record highest October daily minimum temperature
Highest daily minimum
temperature
in October 2010 (°C)
Previous highest
for October
Years of
record
Average for
October
Corrigin 19.8 on the 27th 19.6 on the 23rd in 1977 63 8.1
Bencubbin 24.0 on the 27th 22.7 on the 25th in 1983 52 9.6
Merredin 23.5 on the 27th 23.0 on the 23rd in 1977 45 9.5
Yeelirrie 26.0 on the 27th 25.8 on the 21st in 2008 37 12.4



Record highest October mean daily minimum temperature
Mean daily minimum
temperature
for October 2010 (°C)
Previous highest
for October
Years of
record
Average for
October
Onslow 20.9 20.5 in 2006 118 16.6
Mardie 20.0 19.9 in 2006 54 17.3
Gascoyne Junction 18.9 17.9 in 2008 46 15.2
Onslow Airport 20.9 20.5 in 2006 44 17.6
Emu Creek Station 20.4 19.3 in 2008 38 16.7
Learmonth Airport 18.4 17.9 in 2006 35 16.2



Record lowest October mean daily minimum temperature
Mean daily minimum
temperature
for October 2010 (°C)
Previous lowest
for October
Years of
record
Average for
October
Albany Airport 7.7 7.8 in 1980 45 9.1



Summary statistics for October 2010
Maximum temperatures
for October
(°C)
Minimum temperatures
for October
(°C)
Rainfall
for October
(millimetres)
Mean for
October
2010
Diff
from
average
Highest for
October
2010
Mean for
October
2010
Diff
from
average
Lowest for
October
2010
Total for
October
2010
Average
for
October
Rank of
October
2010
Fraction of
October
average
North Kimberley (district 01)
Kalumburu 34.9 -2.2 37.7 6th 22.8 +0.2 17.2 19th 179.2 39.5 v high 454%
Mount Elizabeth 33.4 -2.7 37.9 4th 19.2 +0.1 11.9 20th 151.4 28.3 highest 535%
Troughton Island 32.2 +0.5 33.2 16th 27.0 +0.7 24.1 12th 56.4 3.0 v high 1880%
Truscott 34.0   36.7 20th 24.4   21.9 19th 121.2
Wyndham 35.9 -3.0 39.2 25th 25.4 -0.4 21.6 18th 160.6 22.6 highest 711%
Wyndham Aero 35.8 -3.9 39.8 4th 24.6 -0.3 19.8 19th 139.0 19.2 v high 724%
East Kimberley (district 02)
Argyle Aerodrome 35.3 -3.1 39.5 4th 24.0 -1.2 18.4 17th 145.2 34.2 v high 425%
Halls Creek Airport 33.5 -3.7 39.0 4th 21.2 -1.5 16.1 16th 71.4 17.4 v high 410%
Kununurra Aero 34.9 -3.8 40.1 4th 23.1 -0.6 18.1 19th 135.0 22.5 highest 600%
Warmun 35.0 -3.7 39.6 4th     17.9 3rd 224.0 23.5 highest 953%
West Kimberley (district 03)
Bidyadanga 35.6 +1.4 39.6 3rd 22.2 +1.2 16.5 20th 1.0 1.0 high 100%
Broome Airport 34.4 +1.5 39.2 27th 23.0 +0.7 17.1 17th 7.0 1.4 v high 500%
Curtin Aero 37.6 -1.3 41.9 4th 22.7 +1.1 16.4 21st 22.4 5.6 v high 400%
Cygnet Bay 34.6 +0.4 38.0 4th 22.1 +0.7 15.5 21st 10.2 1.6 v high 638%
Derby Aero 37.1 0.0 41.4 26th 23.7 +0.7 17.8 21st 4.4 2.7 high 163%
Fitzroy Crossing Aero 37.2 -2.9 42.4 4th 22.1 -0.8 16.4 19th 103.0 19.7 v high 523%
West Roebuck 36.7 +1.0 40.3 27th 21.8 +1.1 15.0 17th 24.8 3.5 v high 709%
De Grey (district 04)
Karratha Aero 34.8 +1.0 39.2 4th 22.2 +1.7 18.0 17th 0 0.3 lowest 0%
Legendre Island 31.4   36.0 4th 23.4   21.0 17th
Mandora 36.8 +1.0 42.2 4th 19.9 +0.9 15.0 1st 0 1.1 lowest 0%
Marble Bar 37.6 -0.7 42.7 24th 22.2 +1.0 17.5 18th 0 3.2 v low 0%
Port Hedland Airport 36.1 +1.3 41.9 4th 21.1 +2.8 15.8 18th 0.4 0.9 average 44%
Roebourne 37.7 +2.1 42.5 4th 20.7 +1.1 16.6 30th 0 0.7 lowest 0%
Roebourne Aero 36.9   41.6 26th 20.8   14.6 18th 0 1.2 v low 0%
Fortescue (district 05)
Barrow Island Airport 31.6 +2.5 35.4 20th 22.9 +1.5 19.8 17th 0 2.9 v low 0%
Learmonth Airport 34.8 +2.3 40.3 23rd 18.4 +2.2 15.5 8th 0 1.8 lowest 0%
Mardie 36.6 +1.7 41.3 22nd 20.0 +2.7 17.8 1st 0 0.9 lowest 0%
Onslow 34.2 +2.5 41.0 22nd 20.9 +4.3 17.5 8th 0 0.8 lowest 0%
Onslow Airport 35.1 +2.4 40.4 22nd 20.9 +3.3 19.3 1st 0 0.9 lowest 0%
Tom Price 33.7 +0.1 39.0 26th 16.7 +0.7 11.5 12th 0 4.4 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 29.1 +3.2 37.3 7th 17.3 +1.0 13.5 9th 0 5.4 lowest 0%
Denham 28.1 +2.9 35.9 8th 18.4 +2.1 15.1 12th 0 6.1 lowest 0%
Emu Creek Station 36.9 +2.7 41.2 23rd 20.4 +3.7 16.7 10th 0 2.1 lowest 0%
Gascoyne Junction 34.4 +2.3 41.2 26th 18.9 +3.7 15.7 18th 1.2 4.4 average 27%
Shark Bay Airport 30.7 +2.9 36.3 8th 16.5 +1.5 12.9 12th 0.2 5.1 low 4%
East Gascoyne (district 07)
Newman Aero 33.7 -1.3 40.0 24th 18.4 +1.2 11.4 17th 6.2 4.9 high 127%
Paraburdoo Aero 36.0 +0.3 42.0 26th 20.1 +2.2 16.5 14th 2.2 3.7 average 59%
Murchison (district 07A)
Meekatharra Airport 30.6 +1.0 37.9 26th 16.7 +1.6 12.1 15th 0.2 6.3 low 3%
Mount Magnet Aero 29.1 0.0 36.6 26th 15.4 +1.3 11.1 11th 19.4 5.4 high 359%
North Coast (district 08)
Carnamah 28.2 +2.2 36.5 26th 11.4 +1.2 5.8 12th 0.4 16.6 v low 2%
Dalwallinu 26.8 +0.8 35.6 26th 9.3 -0.2 2.7 11th 0 10.1 v low 0%
Dalwallinu Comparison 26.8 +1.6 35.1 26th 10.1 -0.1 4.9 11th 0.4 16.7 lowest 2%
Geraldton Airport 27.1 +2.7 34.2 8th 11.0 +0.1 5.1 12th 2.2 18.8 v low 12%
Kalbarri 29.3 +3.2 35.4 8th 13.9 +1.5 8.0 3rd 0.4 14.4 lowest 3%
Morawa Airport 28.9 +1.0 37.1 26th 11.1 +0.5 6.1 11th 0 8.3 v low 0%
Mullewa 29.4 +2.3 37.5 26th 12.7 +1.7 8.4 3rd 0 13.0 lowest 0%
North Island 24.8 +1.8 29.5 8th 17.8 +0.9 12.6 19th 1.0 6.6 average 15%
Wongan Hills 26.6 +1.6 35.3 26th 10.0 0.0 4.0 11th 3.2 19.1 v low 17%
Central Coast (district 09)
Badgingarra Research Stn 26.3 +2.0 35.4 26th 9.9 +0.6 4.4 21st 3.8 29.5 v low 13%
Bickley 22.5 +1.6 31.2 26th 9.7 +0.3 5.0 11th 30.8 67.0 low 46%
Champion Lakes 24.1   32.9 26th 11.8   6.1 11th 15.2
Garden Island HSF 21.9   27.8 8th 12.7   7.0 18th 18.0
Gingin Aero 25.6 +1.7 35.7 26th 7.4 -1.5 1.8 29th 11.4 36.8 low 31%
Gosnells City 25.5 +1.9 34.7 26th 11.6 +0.1 5.8 29th 15.0 46.7 v low 32%
Jandakot Aero 24.8 +2.4 33.4 26th 8.9 -0.5 2.6 29th 21.4 47.0 low 46%
Jurien Bay 25.3 +2.1 31.8 7th 10.8 -0.3 7.6 12th 9.4 25.7 low 37%
Karnet 22.9 +2.2 31.0 26th 8.5 -0.4 2.0 11th 28.8 79.0 low 36%
Lancelin 24.0 +1.7 31.5 31st 11.3 -0.6 6.0 12th 12.0 29.3 v low 41%
Medina Research Centre 24.3 +1.9 32.3 26th 10.0 -0.2 4.5 29th 20.6 41.4 low 50%
Pearce RAAF 25.6 +2.4 34.9 26th 9.0 -1.1 3.0 29th 8.8 36.7 v low 24%
Perth Airport 25.1 +2.6 33.9 26th 9.7 -0.5 3.8 11th 27.4 44.5 low 62%
Perth Metro* 24.6 +1.7 33.8 26th 10.7 -0.5 6.3 12th 20.6 52.4 v low 39%
Rottnest Island 21.6 +1.4 28.2 18th 14.3 +0.6 10.7 15th 14.8 28.9 low 51%
Swanbourne 23.6 +1.8 29.1 8th 11.8 -0.2 7.2 12th 21.6 42.6 low 51%
South Coast (district 09A)
Albany 19.8 +1.4 32.3 19th 11.0 +0.6 6.8 12th 61.6 79.4 average 78%
Albany Airport 20.2 +1.5 31.7 19th 7.7 -1.4 2.5 12th 53.4 72.1 average 74%
Bridgetown 22.2 +2.2 30.2 26th 4.1 -2.8 -0.8 6th 22.0 43.6 low 50%
Bridgetown Comparison 23.2 +2.6 31.5 26th 5.2 -1.6 0.1 6th 21.8 62.1 v low 35%
Bunbury 21.9 +1.2 27.7 26th 8.0 -1.2 2.2 11th 8.0 31.7 v low 25%
Busselton 22.1 +1.5 28.0 26th 8.2 -1.5 3.7 11th 5.6 33.5 v low 17%
Busselton Aero 22.9 +2.1 30.5 26th 6.1 -2.3 0.8 11th 7.8 31.9 low 24%
Cape Leeuwin 19.8 +1.6 26.9 8th 13.3 +0.8 10.0 30th 21.6 65.4 v low 33%
Cape Naturaliste 20.9 +2.2 26.1 18th 11.3 +0.3 6.6 6th 13.0 50.6 v low 26%
Collie East 23.5   31.8 26th 5.4   0.6 11th 25.4
Donnybrook 23.8 +2.7 32.0 26th 7.9 -0.4 2.1 11th 20.8 64.3 v low 32%
Dwellingup 22.5 +2.6 31.1 26th 7.3 -0.6 1.5 11th 35.0 80.9 low 43%
Esperance 22.3 +1.3 36.9 20th 10.5 -0.2 5.8 12th 24.2 46.7 low 52%
Esperance Aero 22.1 +1.2 36.3 20th 9.1 -0.5 4.3 22nd 36.6 45.8 average 80%
Harvey 23.0   31.0 26th 9.0   2.8 15th 29.6 50.5 low 59%
Hopetoun North 22.3 +0.9 36.4 20th 9.2 -0.9 4.0 8th 25.4 38.5 average 66%
Jarrahwood 23.1 +2.7 31.0 26th 5.0 -2.4 -1.5 15th 15.2 59.0 v low 26%
Mandurah 23.1   31.2 26th 12.9   9.1 15th 15.4 33.1 low 47%
Manjimup 21.3 +2.6 29.5 18th 7.7 -0.6 2.9 6th 32.8 76.8 low 43%
North Walpole 19.5   27.4 8th 9.4   5.3 7th 49.0
Pemberton 20.8 +2.1 27.6 18th 8.4 -0.2 4.4 6th 42.6 90.3 v low 47%
Rocky Gully 21.3 +2.7 30.0 19th 7.3 -0.5 2.1 6th 40.6 51.7 average 79%
Shannon 19.9 +1.5 28.1 18th 7.4 -0.7 3.6 6th 44.8 76.2 low 59%
Windy Harbour 19.3 +0.6 27.2 8th 8.2 -2.1 3.8 7th 31.2 67.8 v low 46%
Witchcliffe 21.0 +2.1 27.5 8th 7.7 -1.4 2.4 6th 37.6 65.9 low 57%
North Central (district 10)
Cunderdin Airfield 26.9 +1.3 35.9 9th 7.5 -0.3 -1.7 11th 1.4 13.8 low 10%
Kellerberrin 26.8 +2.1 35.0 9th 7.1 -1.7 2.1 17th 0.1 17.9 lowest 1%
Merredin 26.5 +1.8 34.4 9th 9.6 +0.1 1.6 11th 4.6 18.0 low 26%
Northam 26.6 +2.6 35.0 26th 8.3 -0.6 3.7 11th 3.8 24.5 v low 16%
York 26.5 +2.1 34.0 26th 6.0 -1.2 1.0 11th 3.7 21.5 v low 17%
South Central (district 10A)
Beverley 26.7 +2.5 34.4 26th 7.2 -0.6 0.6 11th 1.8 23.4 v low 8%
Brookton 25.6 +2.5 33.2 9th 7.3 0.0 -0.4 11th 5.7 25.5 v low 22%
Corrigin 25.5 +2.5 34.0 9th 8.1 0.0 1.9 11th 5.4 21.1 low 26%
Hyden 27.0 +2.5 35.6 19th 7.8 -0.3 1.5 11th 0.2 21.5 lowest 1%
Jacup 23.5 +2.3 34.4 19th 6.6 -0.9 1.4 6th 16.2 42.0 low 39%
Katanning 23.7 +2.4 31.9 9th 6.2 -1.0 2.0 12th 7.6 28.2 v low 27%
Katanning Comparison 23.4 +2.7 31.5 9th 6.4 -1.2 1.0 6th 7.4 35.2 v low 21%
Lake Grace 24.8 +2.0 33.7 9th 8.1 -0.6 1.5 11th 0.2 22.7 v low 1%
Lake Grace Comparison 24.9 +2.1 33.4 9th 8.4 -0.2 1.5 11th 0.2 22.6 v low 1%
Narembeen 26.7 +1.8 35.0 26th 8.4 -0.5 2.2 11th 0 18.9 lowest 0%
Narrogin 23.8 +2.8 31.6 9th 7.8 +0.5 1.8 11th 9.6 31.3 v low 31%
Newdegate Research Station 25.0 +2.1 33.8 9th 4.7 -2.2 0.2 8th 0.6 23.0 lowest 3%
Ongerup 23.3 +2.3 33.0 19th 7.0 -1.1 2.6 12th 13.2 33.3 low 40%
Pingelly 24.8 +2.7 32.6 9th 8.2 -0.1 1.6 11th 8.0 24.9 low 32%
Ravensthorpe 23.6 +1.3 33.7 20th 8.1 -0.9 2.6 12th 16.8 37.7 low 45%
Wagin 24.5 +2.8 32.1 9th 7.1 -0.6 1.9 12th 7.1 29.2 v low 24%
Wandering 23.8 +2.0 32.0 26th 4.2 -1.9 -1.1 11th 3.2 28.1 v low 11%
Eucla (district 11)
Balladonia 24.7 -0.3 37.1 20th 8.5 -0.3 3.0 17th 35.7 22.2 high 161%
Eucla 22.6 -0.5 35.1 28th 11.3 0.0 4.5 13th 21.8 18.3 average 119%
Eyre 24.1 +1.2 37.2 10th 8.9 -1.2 -3.6 8th 6.6 19.3 low 34%
Forrest 24.6 -2.4 34.7 28th 10.2 -0.2 4.6 18th 15.6 10.8 high 144%
Red Rocks Point 22.4   35.6 10th 11.7   4.6 4th 6.6
South East (district 12)
Bulga Downs 29.2   38.4 27th 13.8   8.6 3rd 10.6 8.0 high 133%
Kalgoorlie-Boulder Airport 25.6 -0.2 36.1 20th 11.4 +0.4 4.8 15th 11.8 14.7 average 80%
Laverton Aero 26.5 -1.6 36.4 27th 14.0 0.0 7.4 15th 9.4 12.7 average 74%
Leinster Aero 27.8 -1.8 35.1 20th 14.5 -0.2 8.8 17th 0 12.4 v low 0%
Leonora 28.0 -0.9 38.6 27th 13.9 +0.3 8.1 15th 1.2 9.1 low 13%
Leonora Aero 27.5   36.5 27th 14.4   8.5 15th 1.0
Munglinup West 23.6   35.6 20th 8.1   4.5 6th 23.2
Norseman 25.8 +0.9 36.0 20th 9.4 -0.3 2.5 30th 10.2 20.1 average 51%
Norseman Aero 25.5 +0.1 36.1 20th 8.6 -0.5 0.5 30th 8.6 17.5 low 49%
Salmon Gums Res.Stn. 25.0 +1.7 36.6 20th 6.1 -1.4 -1.6 16th 14.0 26.5 average 53%
Southern Cross Airfield 26.5 +0.2 36.9 27th 8.5 -0.3 1.9 15th 3.2 9.5 low 34%
Yeelirrie 29.7 -0.2 38.0 27th 14.5 +2.1 6.0 17th 0 9.5 lowest 0%
North East (district 13)
Balgo Hills 33.3 -3.9 39.8 4th 19.9 -2.5 12.5 16th 72.3 11.5 v high 629%
Carnegie 31.3 -1.4 38.3 22nd 16.2 -0.1 9.1 16th 4.0 4.8 high 83%
Giles Meteorological Office 28.1 -3.6 36.4 3rd 16.1 -1.0 7.8 15th 53.8 14.6 v high 368%
Telfer Aero 35.7 -1.4 42.5 25th 21.5 +0.8 13.7 16th 3.2 2.2 high 145%
Warburton Airfield 29.0 -2.6 36.9 1st 16.4 +1.1 8.0 15th 28.2 14.0 high 201%
Wiluna 30.2 -0.1 38.5 27th 16.3 +2.5 9.5 17th 0 7.1 lowest 0%

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 10 am on Monday 1 November 2010. 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.

*Official Perth observations have been recorded at several different sites with varying instrumentation over the years, and these changes can affect the continuity of the climate record. For the current Mt Lawley site, the most significant changes of this kind relate to temperature and rain days.

For that reason, current mean temperature and rain-day data quoted here are based only on readings from the Mt Lawley site, which commenced observations in 1993. Sunshine recordings are from Perth Airport and for similar reasons current means use only Perth Airport data, which commenced in 1993.

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

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.

Further information

Media
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Enquiries