Western Australia in October 2012: A very warm month

  • Rainfall: near average for WA; 7th driest for southwest WA
  • Maximum temperature: 7th highest for WA; 2nd highest for southwest WA
  • Minimum temperature: 7th highest for WA; above average in southwest WA

Rainfall

Rainfall in the southern half of WA was below to very much below average during October 2012, with areas of lowest on record in parts of the Southeast Coastal, far western Eucla, and southern Goldfields, as well as in the far southwest Gascoyne and far northwest Central West. Balladonia in the Eucla district observed no rainfall for the month, its third rainless October in 103 years of record, while Kalbarri in the Central West equalled its lowest rainfall total in 42 years of record with a monthly total of 0.4 mm. Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), October 2012 rainfall ranked as 7th lowest; whilst for the SWLD, October 2012 ranked as 5th driest since comparable records commenced in 1900. The below average rainfall in southern parts of the state during October 2012 continues the very dry year to date in southern WA. The Lower Southwest has recorded its 7th driest January to October period on record, largely as a result of registering its 8th driest autumn, and 8th driest winter, which included the driest July on record for the region; whilst for the SWLD, the year to date rainfall also ranks as 7th driest on record.

Northern WA saw above to very much above average rainfall during October 2012, although it should be noted that rainfall totals are generally low in northern WA at this time of year and a number of sites along the coastal Pilbara, west Gascoyne and in the Interior observed no rainfall for the month, which is not unprecedented. The areas of above average rainfall were mainly due to a period of showers and thunderstorms during the early and latter part of the month. Moderate to heavy rainfall was observed in the 24 hours to 9am on the 1st in the Kimberley as a result of showers and thunderstorms developing during the afternoon of 30 September and persisting overnight. Daily totals were generally in the 30 mm to 50 mm range, with isolated falls of up to 80 mm. Showers and thunderstorms in the inland Pilbara on the 24th and 25th resulted in some moderate falls with Newman Aerodrome recording 19.8 mm in the 24 hours to 9am on the 25th, its wettest October day in 37 years of record, while Paraburdoo Aerodrome recorded 25.2 mm in the 24 hours to 9am on the 26th, its wettest October day in 37 years of record. The moderate rainfall at Paraburdoo on the 26th, combined with lighter falls on the 27th to 29th, produced Paraburdoo's wettest October on record. Afternoon and evening showers and thunderstorms in the Kimberley on the 29th resulted in 90.0 mm in the 24 hours to 9am on the 30th at Doongan, which was its wettest October day at the site since records commenced in 1988, and the wettest day for WA in October 2012.

When averaged across WA as a whole, October 2012 rainfall was near average, given below average rainfall in the south, and above average rainfall in the north.

Maximum temperature

Maximum temperatures during October 2012 were above to very much above average throughout almost all of WA apart from the east Kimberley and northeastern Interior, which saw near average daytime temperatures. Small areas of highest on record were observed in the southwest Pilbara and north Gascoyne, and southern parts of the state, as a band from the west Pilbara to southeastern Interior, and areas near the border of the South and Southeast Coastal and Great Southern, saw temperatures up to 4 °C above normal. A number of sites in the SWLD, as well as Emu Creek in the west Pilbara, observed their hottest October on record, including Cape Naturaliste with 108 years of record. A particularly hot day was observed in western WA, away from the west coast, on the 21st as a trough deepened near the west coast and Paynes Find in the Gascoyne observed 39.8 °C, which is the site's hottest October temperature in 34 years of record.

Very hot conditions were observed in the north of the state on the 21st and 22nd, particularly in the central Pilbara where temperatures reached the mid-forties. Roebourne observed a maximum temperature of 45.2 °C on the 21st, the highest temperature recorded in WA for October 2012, followed by 44.4 °C on the 22nd. The hot conditions also extended into the southeast of the state, with sites in the Eucla observing temperatures over 40 °C on the 22nd before a cool change on the 23rd dropped temperatures to the low to mid-twenties. A cool day was observed in central and eastern parts of the SWLD and adjacent Goldfields on the 31st due to cloudy and rainy conditions, with maximum temperatures only reaching the mid-teens. Hyden recorded a maximum temperature of 14.1 °C ont he 31st, the lowest maximum in WA for October 2012.

When averaged across the state as a whole, the mean maximum temperature during October 2012 ranked as 7th highest on record for WA, continuing a run of seven consecutive above average months since April. Mean maximum temperatures were also very much above average in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) and October 2012 ranked as 2nd highest on record, only behind the very hot October of 1969. October 2012 continued the very warm year to date in the Lower Southwest, with almost all months so far in 2012, apart from February, observing above average mean maxima. The mean maximum temperature for January to October 2012 in the Lower Southwest was 1.1 °C above normal and ranked as the highest since comparable temperature records commenced in 1950, slightly higher than 2011, which had been the highest on record. The very much above average year so far is largely due to an above average January, a very much above average autumn (5th warmest), and an above average July to October. This run of "warm" temperatures in the Lower Southwest has persisted for three years, with the Lower Southwest only recording two months below the average, in terms of mean maximum temperature, since October 2009.

Minimum temperatures

Most of the Kimberley and northeastern Interior saw below to very much below average overnight minima during October 2012, however most of the remainder of WA recorded above to very much above average minimum temperatures. Ravensthorpe and Esperance in the Southeast Coastal observed their warmest October in 48 and 43 years of record respectively, whilst Hyden equalled its October 2011 record, registering its two warmest Octobers in its 40 years of record in consecutuve years. Minimum temperatures were 2 °C to 3 °C above average through central and northwest WA, with small areas up to 4 °C above normal in central parts of the state, while the central and east Kimberley was up to 2 °C cooler than normal, grading to up to 3 °C cooler than normal in the southeast Kimberley and northeastern Interior.

A very warm morning was observed in coastal parts of the Central West on the 11th as a low moved southward off the west coast and some mid-level cloud developed over the district. Geraldton Airport and Kalbarri observed their warmest October minimum temperature in 71 and 38 years of record respectively. A very warm morning was also reported in the west Pilbara on the 25th, with a weak surface low in the region. Emu Creek reported a minimum of 24.8 °C, its highest October minimum in 41 years of record.

When averaged across the state as a whole, the mean minimum temperature during October 2012 ranked as 7th highest on record. Consecutive above average months in September and October, after eight consecutive below average months to start the year, has seen the statewide minimum rise out of the lowest 10 percent of records. The January to August overnight minimum for WA ranked as 8th coolest on record. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) again saw above average overnight temperatures in October 2012, continuing a run of above average minima in which only two months since November 2010 (May 2012 and July 2012) recorded below average overnight temperatures.

Further information

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Extremes in October 2012
Hottest day 45.2 °C at Roebourne on the 21st
Warmest days on average 40.0 °C at Fitzroy Crossing Aero
Coolest days on average 20.3 °C at Cape Leeuwin
Coldest day 14.1 °C at Hyden on the 31st
Coldest night -2.3 °C at Eyre on the 12th
Coolest nights on average 6.9 °C at York
Warmest nights on average 24.9 °C at Wyndham
Warmest night 30.0 °C at Wyndham on the 28th
Wettest overall 109.0 mm at Doongan
Wettest day 90.0 mm at Doongan on the 30th
Highest wind gust 91 km/h at Cape Leeuwin on the 2nd

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

Record highest October daily rainfall
Highest daily rainfall
in October 2012 (mm)
Previous wettest
for October
Years of
record
Newman Aero 19.8 on the 25th 18.8 on the 9th in 1976 37
Paraburdoo Aero 25.2 on the 26th 18.0 on the 22nd in 1996 37



Record highest total October rainfall
Total rainfall
for October 2012 (mm)
Previous wettest
for October
Years of
record
Average for
October
Paraburdoo Aero 32.8 26.8 in 1975 37 4.4



Record lowest total October rainfall
Total rainfall
for October 2012 (mm)
Previous driest
for October
Years of
record
Average for
October
Balladonia 0.0 = 0.0 in 1980 103 22.9
Kalbarri 0.4 = 0.4 in 2010 42 14.8



Record highest October temperature
Highest temperature
in October 2012 (°C)
Previous warmest
for October
Years of
record
Average for
October
Paynes Find 39.8 on the 21st 39.5 on the 16th in 1995 34 27.5



Record highest October mean daily maximum temperature
Mean daily maximum
temperature
for October 2012 (°C)
Previous warmest
for October
Years of
record
Average for
October
Cape Naturaliste 21.7 21.5 in 2006 108 18.8
Corrigin 26.1 25.9 in 2006 64 23.1
Albany Airport 21.3 20.5 in 1984 47 18.7
Merredin 27.5 = 27.5 in 1969 46 24.7
Ongerup 24.1 23.4 in 1981 44 21.1
Emu Creek Station 37.3 37.0 in 2004 40 34.2
Hyden 27.5 27.1 in 2006 40 24.6



Record highest October daily minimum temperature
Highest daily minimum
temperature
in October 2012 (°C)
Previous warmest
for October
Years of
record
Average for
October
Geraldton Airport 23.2 on the 11th 23.0 on the 29th in 1979 71 10.9
Emu Creek Station 24.8 on the 25th 24.6 on the 19th in 2008 41 16.8
Kalbarri 25.3 on the 11th 23.6 on the 28th in 1979 38 12.5



Record highest October mean daily minimum temperature
Mean daily minimum
temperature
for October 2012 (°C)
Previous warmest
for October
Years of
record
Average for
October
Ravensthorpe 11.2 10.7 in 1967 48 9.0
Esperance 12.4 11.9 in 2011 43 10.7
Hyden 10.1 = 10.1 in 2011 40 8.2



Summary statistics for October 2012
Maximum temperatures
for October
(°C)
Minimum temperatures
for October
(°C)
Rainfall
for October
(millimetres)
Mean for
October
2012
Diff
from
average
Highest for
October
2012
Mean for
October
2012
Diff
from
average
Lowest for
October
2012
Total for
October
2012
Average
for
October
Rank of
October
2012
Fraction of
October
average
North Kimberley (district 01)
Doongan 36.6 -0.3 38.8 7th 20.1 -1.2 15.1 15th 109.0 33.7 v high 323%
Truscott 34.3   36.5 14th 23.8   19.0 4th 0
Wyndham 38.0 -0.8 40.3 28th 24.9 -0.9 19.3 15th 22.6 22.8 high 99%
Wyndham Aero 38.9 -0.4 41.2 30th 23.9 -1.0 18.2 14th 20.2 19.7 high 103%
East Kimberley (district 02)
Argyle Aerodrome 38.3 +0.1 41.4 10th 24.2 -0.9 17.6 3rd 37.0 35.4 average 105%
Halls Creek Airport 36.7 -0.4 40.7 31st 21.6 -1.1 15.4 16th 28.0 17.8 high 157%
Kununurra Aero 38.4 -0.1 42.8 30th 21.4 -2.2 13.9 15th 38.2 23.6 high 162%
Warmun 38.6 0.0 42.7 31st         42.4 23.6 high 180%
West Kimberley (district 03)
Bidyadanga 35.7 +1.5 42.5 8th 22.3 +1.3 18.2 6th 2.2 1.0 v high 220%
Broome Airport 33.9 +1.0 39.5 12th 24.1 +1.8 19.6 6th 0 1.4 lowest 0%
Curtin Aero 39.8 +1.0 42.6 27th 21.3 -0.3 15.7 4th 7.0 5.4 average 130%
Derby Aero 37.3 +0.3 41.2 31st 23.1 +0.1 18.3 4th 0 2.6 lowest 0%
Fitzroy Crossing Aero 40.0 +0.2 42.5 10th 22.4 -0.4 14.0 4th 9.6 18.5 average 52%
West Roebuck 36.7 +1.1 42.2 10th 21.3 +0.6 16.8 6th 1.8 3.1 average 58%
De Grey (district 04)
Bedout Island 31.0   36.0 9th        
Karratha Aero 34.8 +1.1 39.8 22nd 21.8 +1.3 18.2 13th 0 0.3 lowest 0%
Mandora 36.9 +1.1 43.7 9th 20.1 +1.1 15.5 5th 0.8 1.1 high 73%
Marble Bar 39.7 +1.5 44.0 21st 22.7 +1.4 17.8 13th 14.4 3.8 high 379%
Port Hedland Airport 36.3 +1.5 41.7 9th 20.9 +2.5 16.6 13th 0 0.9 lowest 0%
Roebourne 38.4 +2.8 45.2 21st 22.2 +2.6 18.5 3rd 0 0.7 lowest 0%
Roebourne Aero 38.1 +1.2 45.1 21st 20.5 +1.0 14.6 13th 0 1.0 v low 0%
Fortescue (district 05)
Barrow Island Airport 30.4 +1.1 36.7 24th 22.5 +1.0 18.7 1st 0 2.5 v low 0%
Learmonth Airport 34.4 +1.8 40.4 21st 17.6 +1.3 14.0 3rd 0 1.7 lowest 0%
Mardie 36.3 +1.4 41.5 23rd 19.8 +2.5 16.2 5th 0 0.8 lowest 0%
Onslow Airport 34.4 +1.7 39.2 22nd 20.2 +2.5 16.5 1st 1.4 0.9 high 156%
Wittenoom 37.5 +2.2 42.2 21st 23.3 +2.6 17.2 29th 24.2 3.9 v high 621%
West Gascoyne (district 06)
Carnarvon Airport 28.1 +2.2 41.9 10th 17.0 +0.6 12.3 1st 0 5.3 lowest 0%
Denham 27.7 +2.3 38.0 10th 17.4 +0.9 13.2 4th 0.9 6.1 low 15%
Emu Creek Station 37.3 +3.1 42.0 21st 19.2 +2.4 15.3 6th 0.4 2.1 average 19%
Murchison 32.6 +2.2 39.5 21st 15.0 +2.1 8.8 1st 1.2 5.1 average 24%
Shark Bay Airport 29.8 +1.8 38.7 10th 15.7 +0.5 11.9 4th 0.4 5.0 low 8%
East Gascoyne (district 07)
Newman Aero 36.1 +1.3 41.3 22nd 20.1 +2.7 14.1 13th 23.6 5.6 v high 421%
Paraburdoo Aero 37.5 +1.9 42.3 21st 19.6 +1.5 15.3 29th 32.8 4.4 highest 745%
Murchison (district 07A)
Meekatharra Airport 32.9 +3.3 39.6 21st 17.4 +2.3 13.8 16th 0 6.3 lowest 0%
Mount Magnet Aero 31.4 +2.4 40.6 21st 15.9 +1.7 11.1 23rd 5.8 6.9 average 84%
Paynes Find 29.8 +2.3 39.8 21st 13.0 +1.7 8.9 23rd 1.0 10.7 low 9%
North Coast (district 08)
Carnamah 28.3 +2.3 36.5 28th 12.5 +2.2 7.8 4th 5.3 16.7 low 32%
Dalwallinu 27.4 +1.3 36.4 28th 10.4 +0.8 6.1 7th 2.2 14.1 low 16%
Eneabba 28.4 +2.0 37.3 28th     8.2 8th 5.0 24.0 low 21%
Geraldton Airport 27.2   38.3 1st 12.5   7.1 16th 6.8
Geraldton Airport Comparison 27.2 +2.7 38.1 27th 12.7 +1.8 6.4 5th 2.0 19.6 v low 10%
Kalbarri 28.6 +2.4 37.4 27th 14.2 +1.7 9.4 18th 0.4 14.8 lowest 3%
Morawa Airport 29.6 +1.7 37.5 21st 12.0 +1.2 6.9 4th 3.6 8.9 low 40%
Mullewa 29.6 +2.5 37.1 21st 13.0 +1.9 8.8 15th 1.8 13.1 low 14%
North Island 25.0 +1.8 33.4 27th 17.8 +0.7 12.9 2nd 1.6 8.6 average 19%
Wongan Hills 27.0 +2.0 35.6 28th 11.7 +1.7 7.0 4th 3.4 19.9 v low 17%
Central Coast (district 09)
Badgingarra Research Stn 25.6 +1.3 33.9 27th 10.3 +1.0 4.3 23rd 5.0 29.2 v low 17%
Bickley 22.0 +1.0 32.2 28th 10.8 +1.3 6.8 5th 37.6 66.6 low 56%
Champion Lakes 23.8   34.4 28th 13.2   9.8 8th 17.2
Garden Island HSF 23.0 +2.3 33.0 1st 14.1 +0.8 10.8 5th 17.4 30.5 low 57%
Gingin Aero 25.4 +1.3 35.1 28th 10.6 +1.6 4.5 16th 9.6 37.2 low 36%
Gosnells City 25.7 +1.9 36.5 28th 12.2 +0.6 6.5 16th 16.8 46.1 v low 13%
Jandakot Aero 24.6 +2.0 35.5 28th 10.6 +1.1 4.4 5th 17.4 46.5 low 37%
Jurien Bay 25.3 +2.0 33.2 27th 12.2 +1.0 7.0 5th 7.1 26.7 v low 27%
Karnet 22.1 +1.4 32.2 28th 10.2 +1.3 6.5 5th 39.1 77.4 low 51%
Lancelin 25.1 +2.7 36.0 1st 12.8 +0.9 7.3 6th 8.6 28.9 v low 30%
Medina Research Centre 25.1 +2.6 36.0 28th 11.5 +1.2 6.4 5th 12.8 40.2 v low 32%
Pearce RAAF 25.7 +2.4 36.1 28th 11.2 +1.1 4.8 5th 7.6 36.5 v low 21%
Perth Airport 24.9 +2.3 36.0 28th 11.7 +1.5 6.7 8th 13.4 44.3 v low 30%
Perth Metro* 25.0 +1.9 36.2 28th 12.5 +1.2 8.5 5th 15.6 52.3 low 30%
Rottnest Island 22.6 +2.6 31.1 1st 15.1 +1.9 11.6 5th 7.4 37.1 v low 20%
Swanbourne 25.0 +3.0 35.2 1st 13.6 +1.5 8.0 5th        
South Coast (district 09A)
Albany 21.5 +3.1 33.4 21st 12.1 +1.7 7.4 6th 32.6 78.8 v low 41%
Albany Airport 21.5   33.1 21st 9.4   3.9 6th 34.6
Albany Airport Comparison 21.3 +2.6 33.2 21st 9.4 +0.3 4.4 6th 28.4 71.0 v low 40%
Bridgetown 21.8 +1.6 31.1 28th 7.6 +0.9 2.4 1st 31.8 43.8 average 73%
Bunbury 22.8 +2.0 29.1 27th 10.4 +1.2 3.3 5th 16.8 30.9 low 54%
Busselton Aero 22.9 +1.8 31.6 28th 9.0 +0.6 2.3 5th 24.6 31.1 average 79%
Cape Leeuwin 20.3 +2.1 28.8 1st 14.1 +1.5 10.2 6th 33.8 65.2 low 52%
Cape Naturaliste 21.7 +2.9 28.9 28th 12.2 +1.2 8.3 5th 17.6 50.1 v low 35%
Collie East 22.8   31.4 28th 7.7   1.9 5th 23.4 41.4 low 57%
Donnybrook 23.6 +2.5 33.2 28th 10.0 +1.7 4.0 5th 30.0 63.7 low 47%
Dwellingup 22.2 +2.2 32.4 28th 9.2 +1.3 3.7 5th 57.4 80.0 average 72%
Esperance 23.1 +2.0 35.6 2nd 12.4 +1.7 5.4 11th 13.4 45.9 low 29%
Esperance Aero 23.9 +2.9 34.2 21st 10.4 +0.8 3.3 6th 14.2 46.0 v low 31%
Harvey 22.7 +1.5 30.0 28th 10.4 +0.9 5.5 5th 30.8 48.2 low 64%
Hopetoun North 23.0 +1.6 38.4 21st 9.9 -0.2 0.9 11th 2.6 37.8 v low 7%
Jarrahwood 22.9 +2.4 32.6 28th 7.3 -0.1 0.5 5th 39.6 57.6 low 69%
Mandurah 23.1 +1.5 30.8 27th 14.4 +1.2 10.5 5th 27.2 32.2 average 84%
Manjimup 21.7 +2.9 31.1 28th 9.2 +0.9 2.6 5th 37.4 76.2 low 49%
North Walpole 20.5   29.6 1st 10.4   4.9 5th  
Pemberton 21.2 +2.5 30.5 1st         52.5 90.0 low 58%
Rocky Gully 21.6 +2.8 32.4 28th 8.4 +0.5 2.1 5th 25.2 54.1 low 47%
Windy Harbour 20.6 +1.9 30.9 1st 10.7 +0.4 5.1 10th 65.6 68.8 average 95%
Witchcliffe 21.5 +2.3 29.6 28th 8.6 -0.5 3.0 5th 41.0 63.6 low 64%
North Central (district 10)
Bencubbin 27.4 +2.3 37.5 21st 12.0 +2.3 6.9 4th 5.2 15.5 low 34%
Cunderdin Airfield 27.4 +1.7 37.6 28th 9.4 +1.5 2.3 4th 1.2 16.3 low 7%
Kellerberrin 27.7 +3.0 37.5 28th         3.8 18.1 low 21%
Merredin 27.5 +2.8 37.9 21st 12.0 +2.4 6.3 4th 6.8 18.2 low 37%
Northam 26.6 +2.6 35.5 28th 10.0 +1.1 4.3 1st 2.0 24.6 v low 8%
York 26.3 +1.8 36.3 28th 6.9 -0.3 0.6 1st 5.6 22.9 low 24%
South Central (district 10A)
Beverley 26.4 +2.1 36.0 28th 9.2 +1.3 3.2 1st 2.8 23.6 v low 12%
Brookton 25.5 +2.3 36.3 28th 9.2 +1.8 4.0 4th 2.6 25.5 v low 10%
Corrigin 26.1 +3.0 36.2 28th 9.6 +1.4 3.0 2nd 3.0 21.1 v low 14%
Hyden 27.5 +2.9 38.1 21st 10.1 +1.9 3.5 4th 4.7 21.6 low 22%
Jacup 24.9 +3.5 35.9 21st 8.0 +0.5 3.2 4th 2.6 42.4 v low 6%
Katanning 24.3 +2.8 35.6 28th 7.7 +0.5 1.5 5th 10.8 30.4 low 36%
Lake Grace 25.3 +2.3 35.7 21st 10.2 +1.4 5.5 25th 4.6 25.3 v low 18%
Narembeen 27.5 +2.6 36.9 21st 10.6 +1.6 5.1 4th 4.3 19.1 low 23%
Narrogin 23.9 +2.9 34.9 28th 9.7 +2.3 4.6 5th 3.4 31.2 v low 11%
Newdegate Research Station 25.5 +2.5 36.2 21st 7.8 +0.9 2.4 4th 1.8 23.4 v low 8%
Ongerup 24.1 +3.0 34.8 21st 9.3 +1.2 3.5 5th 13.2 33.3 low 40%
Pingelly 24.6 +2.4 35.5 28th 10.1 +1.8 5.0 4th 4.8 24.9 v low 19%
Ravensthorpe 24.6 +2.3 36.5 21st 11.2 +2.2 5.6 6th 5.5 37.7 v low 15%
Wagin 24.3 +2.6 35.6 28th 8.8 +1.1 3.1 5th 6.6 29.2 v low 23%
Wandering 23.5 +1.5 35.4 28th 7.1 +1.0 0.5 5th 5.2 27.6 low 19%
Eucla (district 11)
Balladonia 27.4 +2.4 37.5 13th 10.1 +1.3 2.8 11th 0 22.9 lowest 0%
Eucla 25.4 +2.3 40.7 22nd 12.9 +1.6 7.4 7th 3.0 18.4 low 16%
Eyre 26.2 +3.3 42.2 22nd 10.0 -0.1 -2.3 12th 7.8 19.7 low 40%
Forrest 29.5 +2.7 41.4 22nd 11.3 +0.9 2.8 11th 2.2 10.3 low 21%
Red Rocks Point 24.3   41.6 22nd 13.2   8.1 12th 8.2
South East (district 12)
Bulga Downs 31.7   40.3 21st 15.1   8.0 1st 0.4 8.5 average 5%
Kalgoorlie-Boulder Airport 28.2 +2.5 36.7 21st 13.3 +2.3 8.5 26th 0.8 15.3 v low 5%
Laverton Aero 31.4 +3.4 38.8 22nd 15.9 +1.9 9.7 11th 1.4 13.8 low 10%
Leinster Aero 31.9 +2.5 38.9 21st 16.7 +2.0 11.9 11th 2.6 12.9 average 20%
Leonora 31.3 +2.5 39.5 21st 15.7 +2.0 11.2 10th 2.0 9.6 average 21%
Leonora Aero 30.9   38.6 21st 15.9   11.3 10th 1.4
Munglinup West 25.0 +2.1 37.0 21st 10.2 +1.0 4.9 26th 2.2 35.5 v low 6%
Norseman Aero 27.4 +2.1 36.7 29th 10.9 +1.7 2.6 26th 1.0 17.7 v low 6%
Salmon Gums Res.Stn. 26.0 +2.7 35.9 29th 8.9 +1.3 -0.3 26th 6.6 27.2 low 24%
Southern Cross Airfield 27.8 +1.6 39.0 21st 11.3 +2.3 5.6 4th 3.6 13.4 low 27%
North East (district 13)
Carnegie 35.1 +2.4 41.8 22nd 17.9 +1.6 10.8 2nd 0 5.6 lowest 0%
Giles Meteorological Office 33.7 +2.1 39.7 31st 17.8 +0.7 8.1 11th 10.0 15.7 average 64%
Telfer Aero 38.7 +1.7 42.3 22nd 22.6 +1.8 13.6 12th 2.8 2.9 high 97%
Warburton Airfield 34.2 +2.7 41.6 22nd 17.6 +2.2 9.8 11th 0 14.8 lowest 0%
Wiluna 33.7 +3.5 39.9 21st 17.2 +3.4 9.5 1st 1.4 7.1 average 20%
Offshore Islands (district 200)
Christmas Island Aero 27.6 +0.8 29.2 31st 23.4 +0.8 22.7 5th 0.8 65.6 low 1%
Cocos Island Airport 28.9 +0.2 30.0 30th 24.8 +0.6 23.0 7th 76.6 84.1 average 91%
Varanus Island 30.0 +0.9 32.8 28th 23.2 +0.8 21.0 7th 0 1.3 v low 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 11 am on Thursday 1 November 2012. 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.

*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 minimum 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.

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