Western Australia in October 2018: very warm overnight temperatures

Overnight temperatures were above average for most of Western Australia, and well above average in the State's south. It was the ninth-warmest October on record for WA as a whole. Daytime temperatures were above average in the north and east and far southwest resulted in the state-wide averaged mean maximum temperature over one degree warmer than normal. Rainfall was above average to near average for much of WA away from the north.

Above average rainfall for much of WA

  • Rainfall was above average for WA as a whole
  • Rainfall was above average and the wettest October since 2014 for the South West Land Division (SWLD) as a whole
  • A series of troughs produced isolated thunderstorms with moderate rainfall in a broad area from the southeast Gascoyne and eastern SWLD to southern Goldfields and Eucla; several sites had their wettest October on record or wettest October since 1975

Above average minimum temperatures for most of WA

  • Mean minimum temperature was 1.47 °C above average for WA, which was the ninth-highest in October on record
  • Mean minimum temperature was 1.68 °C above average for the SWLD, which was the ninth-highest in October on record
  • Mean maximum temperature was 1.22 °C above average for WA
  • Extreme hot days with temperature over 44 °C were observed in the Kimberley on three occasions: 44.0 °C(29th) and 44.1 °C(9th) at Fitzroy Crossing Aero, and 44.2 °C(28th) at Wyndham Aero
  • Kalumburu in the north Kimberley had its October temperature record on the 15th with 43.4 °C, which also overtook its previous all-time record of 42.1 °C set on 2 November 2003
  • Daily maxima at Kalumburu exceeded its previous October record again on the 16th (42.7 °C), 27th (42.2 °C) and 28th (43.1 °C); Kalumburu had eight days in total with temperature exceeding 40 °C and resulting in the month being hottest October on record
  • Sites near the west coast recorded their highest October mean minimum temperature on record or highest since 1967

Further information

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Extremes in October 2018
Hottest day 44.2 °C at Wyndham Aero on the 28th
Warmest days on average 41.5 °C at Fitzroy Crossing Aero
Coolest days on average 18.4 °C at Cape Leeuwin
Coldest day 12.7 °C at Pemberton on the 18th
Coldest night 0.6 °C at Eyre on the 17th
Coolest nights on average 8.2 °C at Wandering
Warmest nights on average 26.8 °C at Troughton Island
Warmest night 29.7 °C at Argyle Aerodrome on the 28th
Warmest on average overall 33.2 °C at Argyle Aerodrome
Coolest on average overall 14.2 °C at Shannon
Wettest overall 98.2 mm at Adina
Wettest day 73.8 mm at Bedford Downs Airstrip on the 18th
Strongest wind gust 106 km/h at Forrest on the 14th
106 km/h at Meekatharra Airport on the 30th

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 October daily rainfall
New record
(mm)
Old
record
Years of
record
Wialki 39.4 on the 1st 35.6 on the 15th in 1975 86
Mount Magnet Aero 20.2 on the 25th 14.0 on the 6th in 2001 24



Record highest October total rainfall
New record
(mm)
Old
record
Years of
record
Average for
October
Nungarin 63.0 60.7 in 1932 114 16.7
Wialki 85.7 82.1 in 1947 86 15.2
Mount Gibson 51.0 40.5 in 2001 37 11.4
Forrest 25.6 = 25.6 in 2000 24 10.6
Mount Magnet Aero 37.2 32.4 in 2011 24 7.4
Southern Cross Airfield 87.8 82.4 in 2011 23 18.9

Highest October total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
October
Bulong 79.4 95.7 in 1909 16.3
Beria 48.6 49.8 in 1975* 13.4
Tamala 29.6 72.6 in 1975* 7.3
Gindalbie 66.5 103.0 in 1975* 10.7
Bonnie Rock 48.2 67.2 in 1975* 13.7

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported




Record highest October temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Kalumburu 43.4 on the 15th 41.6 on the 12th in 2007 21 36.9



Record highest October mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Kalumburu 38.7 38.1 in 2002 20 36.9



Record highest October daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Warburton Airfield 28.6 on the 25th 26.9 on the 23rd in 2015 30 15.8



Record highest October mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Perth Airport 12.6 = 12.6 in 1967 74 10.3
Kalbarri 14.8 14.7 in 1982 43 12.6
Jandakot Aero 12.5 11.7 in 2011 28 9.7
Newdegate Research Station 8.9 = 8.9 in 2015 22 6.9
Busselton Aero 10.5 10.0 in 2011 21 8.6

Highest October mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
October
Pearce RAAF 12.2 12.3 in 1967 10.1



Record highest October mean temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Argyle Aerodrome 33.2 = 33.2 in 2017 24 31.8



Summary statistics for October 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
October
2018
Diff
from
average
Highest for
October
2018
Mean for
October
2018
Diff
from
average
Lowest for
October
2018
Total for
October
2018
Average
for
October
Rank of
October
2018
Fraction of
October
average
North Kimberley (district 01)
Doongan 37.6 +0.7 39.8 16th 22.4 +1.1 17.5 2nd 25.6 38.0 average 67%
Kalumburu 38.7 +1.8 43.4 15th 22.6 0.0 17.9 2nd 0 37.3 lowest 0%
Troughton Island 32.3 +0.5 33.3 12th 26.8 +0.4 24.9 2nd 0 2.4 lowest 0%
Truscott 34.6 +0.3 40.5 28th 25.0 +0.4 21.7 4th 0 20.5 v low 0%
Wyndham Aero 40.3 +0.8 44.2 28th 25.9 +1.1 21.5 2nd 0.4 19.2 low 2%
East Kimberley (district 02)
Argyle Aerodrome 39.8 +1.4 42.3 28th 26.6 +1.4 21.6 1st 9.6 32.2 average 30%
Halls Creek Airport 38.8   41.0 31st 22.9   16.5 1st 6.8
Kununurra Aero 39.8 +1.1 43.3 28th 23.7 +0.3 18.2 1st 0.6 21.7 low 3%
Warmun 38.6 -0.1 40.5 31st 22.9 -0.1 15.6 2nd 15.0 23.3 average 64%
West Kimberley (district 03)
Bidyadanga 35.3 +0.9 40.5 17th 22.9 +1.7 18.0 16th 0 1.2 lowest 0%
Broome Airport 32.4 -0.6 40.1 17th 23.4 +0.9 18.6 16th 0 1.4 lowest 0%
Curtin Aero 39.9 +0.9 43.0 17th 21.2 -0.6 18.2 16th 0 7.2 lowest 0%
Cygnet Bay       21.9 +0.3 18.6 17th 0 1.5 lowest 0%
Derby Aero 38.6 +1.4 43.2 21st 22.9 -0.3 19.9 16th 0 2.7 lowest 0%
Fitzroy Crossing Aero 41.5 +1.4 44.1 9th 24.0 +0.9 19.0 17th 2.0 15.6 average 13%
De Grey (district 04)
Bedout Island 30.2 -1.1 33.1 17th 24.1 -0.3 22.9 26th
Karratha Aero 33.1 -1.0 36.5 22nd 20.9 +0.1 17.5 17th 0 0.4 lowest 0%
Legendre Island 29.5   32.6 22nd 22.2   19.3 25th
Mandora 36.6 +0.6 43.2 22nd 19.3 +0.1 13.1 17th 0.2 1.2 high 17%
Marble Bar 39.4 +0.6 42.6 31st 21.7 -0.1 16.1 26th 0 3.3 v low 0%
Pardoo Station 37.5 +1.6 41.6 22nd 19.6 -0.1 15.5 24th 0 0.9 lowest 0%
Port Hedland Airport 36.4 +1.4 41.5 9th 19.6 +1.0 16.6 17th 0.6 1.0 average 60%
Roebourne Aero 37.2 -0.3 40.8 22nd 19.6 -0.3 15.3 21st 0 1.6 v low 0%
Fortescue (district 05)
Barrow Island Airport 28.4 -1.2 32.7 29th 21.1 -0.7 18.2 17th 0.2 1.9 high 11%
Karijini North 36.5   41.0 31st 20.9   15.0 18th 0.2
Learmonth Airport 32.6 -0.2 40.1 29th 16.0 -0.4 13.0 15th 0.4 1.6 high 25%
Mardie 33.3 -1.7 38.2 22nd 17.6 +0.1 14.3 20th 0 0.8 lowest 0%
Onslow Airport 31.8 -1.1 36.8 28th 18.3 +0.4 13.6 16th 0 0.8 lowest 0%
Thevenard Island 28.6 -1.1 31.4 28th 20.2 -0.5 16.9 17th 0 1.1 lowest 0%
Wittenoom 36.8 +1.3 40.8 31st 21.6 +0.7 16.9 1st 0 3.9 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 25.5 -0.6 28.0 28th 17.5 +1.1 14.0 1st 0.2 5.0 low 4%
Denham 24.9 -0.8 28.0 28th 17.9 +1.2 14.2 15th 8.8 6.0 high 147%
Murchison 30.0 -0.8 38.5 29th 14.0 +0.6 5.4 14th 17.4 5.0 high 348%
Shark Bay Airport 26.7 -1.7 32.7 28th 16.0 +0.7 12.1 15th 12.0 4.6 high 261%
East Gascoyne (district 07)
Newman Aero 35.5 +0.3 40.3 30th 17.6 -0.2 12.8 20th 5.8 5.9 high 98%
Paraburdoo Aero 35.4 -0.6 40.7 30th 17.1 -1.2 12.5 1st 0 4.0 lowest 0%
Murchison (district 07A)
Meekatharra Airport 31.3 +1.5 39.7 30th 16.5 +1.2 10.3 19th 2.6 6.1 average 43%
Mount Magnet Aero 29.5 0.0 38.4 30th 15.4 +0.9 9.2 15th 37.2 7.4 highest 503%
Paynes Find 28.5 +0.6 37.1 29th 13.3 +1.8 7.2 19th 19.6 10.5 high 187%
North Coast (district 08)
Dalwallinu 26.6 +0.1 35.6 17th 10.3 +0.6 6.2 21st 25.4 13.8 high 184%
Geraldton Airport 24.6   31.6 28th 12.8   6.2 16th 5.6
Kalbarri 25.0 -1.3 31.7 28th 14.8 +2.2 9.1 20th 13.8 13.8 average 100%
Morawa Airport 28.7 +0.4 37.6 29th 11.9 +0.8 6.4 15th 17.8 9.1 high 196%
Mullewa 28.3 +1.0 37.0 29th 12.5 +1.3 6.9 15th 6.7 12.8 average 52%
North Island 23.6 0.0 25.6 28th 17.4 +0.2 14.8 19th 5.6 6.3 high 89%
Wongan Hills 25.4 +0.2 34.8 17th 11.2 +1.1 6.5 20th 35.0 19.8 high 177%
Central Coast (district 09)
Badgingarra Research Stn 24.1 -0.4 32.2 28th 10.2 +0.8 4.0 19th 35.2 27.3 high 129%
Bickley 20.9 -0.3 30.0 17th 10.7 +1.0 6.5 14th 83.8 66.1 average 127%
Garden Island HSF 21.2 +0.2 29.4 9th 14.4 +0.8 11.9 16th 23.4 27.4 average 85%
Gingin Aero 24.3 0.0 34.3 17th 10.7 +1.5 2.8 23rd 29.8 34.8 average 86%
Jandakot Aero 23.2 +0.3 29.9 17th 12.5 +2.8 7.2 23rd 48.6 46.2 average 105%
Jurien Bay 23.5 +0.1 31.8 9th 13.0 +1.7 7.8 23rd 22.8 25.3 average 90%
Karnet 21.0 +0.2 29.0 17th 10.2 +1.2 5.0 19th 97.5 76.0 high 128%
Lancelin 21.9 -0.6 31.5 9th 13.1 +1.1 8.0 20th 42.3 28.5 high 148%
Millendon (Swan Valley) 24.1   33.4 17th 12.0   5.7 23rd 52.2
Pearce RAAF 24.3 +0.8 33.2 17th 12.2 +2.1 5.4 23rd 43.6 36.0 average 121%
Perth Airport 23.8 +1.1 33.0 17th 12.6 +2.3 7.0 23rd 35.4 43.2 average 82%
Perth Metro 23.5 +0.2 29.7 17th 13.2 +1.7 7.8 16th 40.0 38.8 average 103%
Rottnest Island 20.9 +0.4 27.8 9th 14.6 +0.6 10.9 19th 18.0 28.3 average 64%
Swanbourne 21.9 -0.4 29.5 9th 13.6 +1.2 10.5 16th 32.8 42.3 average 78%
South Coast (district 09A)
Albany 19.0 +0.5 33.2 17th 12.6 +2.1 7.7 19th 60.4 78.4 average 77%
Albany Airport 19.9   32.8 17th 10.4   5.7 23rd 52.6
Bridgetown 20.9 +0.4 28.5 17th 9.0 +1.9 3.5 19th 30.4 42.7 average 71%
Bunbury 21.9 +0.8 27.3 9th 11.6 +2.1 7.9 24th 37.6 32.2 average 117%
Busselton Aero 21.4 +0.1 26.2 27th 10.5 +1.9 5.5 19th 39.2 30.3 high 129%
Cape Leeuwin 18.4 +0.2 20.8 11th 13.7 +1.1 10.4 19th 62.4 64.1 average 97%
Cape Naturaliste 20.6 +1.7 25.0 9th 11.7 +0.7 8.2 30th 37.4 48.9 average 76%
Collie East 21.7 0.0 30.7 17th 9.4 +1.9 3.5 19th 47.0 41.3 average 114%
Donnybrook 22.6 +1.4 29.2 17th 11.3 +2.9 5.5 19th 72.0 62.9 average 114%
Dwellingup 21.0 +0.9 29.1 17th 10.1 +2.1 4.8 16th 79.2 79.0 average 100%
Esperance 21.1 -0.1 30.5 17th 12.3 +1.5 8.2 19th 76.0 47.1 high 161%
Esperance Aero 21.5 -0.1 29.9 29th 11.0 +1.2 5.8 23rd 54.2 46.4 average 117%
Hopetoun North 20.6 -0.8 33.1 17th 11.9 +1.7 7.5 19th 47.0 39.3 average 120%
Jarrahwood 21.6 +0.8 27.5 28th 9.4 +1.9 4.0 19th 43.0 55.8 average 77%
Mandurah 21.9 0.0 29.2 9th 14.0 +0.6 10.8 19th 40.8 30.7 high 133%
Manjimup 20.2 +1.3 30.1 17th 9.4 +1.1 5.3 19th 59.6 74.8 average 80%
North Walpole 18.8 -0.2 30.6 17th 10.9 +0.5 7.5 19th 79.8 79.6 average 100%
Rocky Gully 19.5 +0.2 29.9 17th 9.3 +1.2 5.7 19th 55.4 54.7 average 101%
Shannon 18.9 +0.2 28.9 17th 9.4 +1.1 5.6 19th 57.4 74.7 average 77%
Witchcliffe 19.2 -0.4 24.7 28th 10.7 +1.4 6.3 3rd 66.2 62.0 average 107%
North Central (district 10)
Bencubbin 25.0 -0.2 35.0 29th 11.5 +1.7 6.0 15th 28.3 15.7 high 180%
Cunderdin Airfield 25.6 -0.5 35.5 17th 9.7 +1.6 2.6 20th 29.2 18.3 high 160%
Merredin 25.0 0.0 34.2 29th 11.4 +1.7 5.5 19th 44.3 18.7 v high 237%
Northam 24.7 +0.6 34.5 17th 10.7 +1.8 4.8 20th 45.3 24.7 high 183%
York 24.9 -0.1 34.6 17th 8.6 +1.4 2.8 20th 25.1 22.9 average 110%
South Central (district 10A)
Beverley 25.2 +0.7 34.2 17th 10.2 +2.2 4.6 19th 30.2 23.4 high 129%
Brookton 24.0 +0.6 34.0 17th 9.2 +1.7 3.5 19th 40.7 25.4 high 160%
Corrigin 24.1 +0.8 33.6 17th 10.2 +2.0 3.9 19th 31.4 21.6 high 145%
Hyden 24.9 0.0 34.0 29th 10.6 +2.3 3.7 20th 22.8 21.6 average 106%
Jacup 21.3 -0.6 32.6 17th 9.6 +1.9 4.2 19th 29.6 39.3 average 75%
Katanning 21.7 -0.2 32.2 17th 9.5 +2.0 6.3 16th 30.0 30.8 average 97%
Lake Grace 22.9 -0.5 32.8 17th 10.3 +1.3 5.7 19th 16.8 26.2 low 64%
Narembeen 24.9 -0.2 33.6 17th 10.9 +1.8 4.2 20th 26.2 19.2 high 136%
Narrogin 22.3 +1.1 32.6 17th 9.7 +2.2 4.8 19th 48.4 31.0 high 156%
Newdegate Research Station 23.1 -0.4 29.7 29th 8.9 +2.0 3.0 23rd 23.2 23.7 average 98%
Pingelly 23.2 +0.7 33.2 17th 10.3 +1.9 3.3 19th 43.4 24.9 high 174%
Ravensthorpe 22.0 -0.5 32.0 17th 10.7 +1.6 5.5 19th 53.8 38.1 high 141%
Wagin 22.6 +0.6 33.0 17th 10.0 +2.1 5.5 16th 35.6 28.9 high 123%
Wandering 22.5 +0.2 31.7 17th 8.2 +1.9 3.0 19th 33.8 28.5 average 119%
Eucla (district 11)
Eucla 24.2 +1.1 37.4 18th 12.7 +1.4 5.1 20th 19.2 18.2 average 105%
Eyre 24.2 +0.9 38.8 18th 11.2 +1.1 0.6 17th 60.9 19.7 v high 309%
Forrest 28.1 +0.6 40.7 31st 11.7 +1.0 5.8 17th 25.6 10.6 highest 242%
Red Rocks Point 22.0 -1.0 36.6 18th 13.8 +1.6 6.3 20th 39.6 18.0 high 220%
South East (district 12)
Bulga Downs 29.9 -0.6 39.5 30th 14.1 +0.2 7.7 19th
Kalgoorlie-Boulder Airport 25.4 -0.5 33.4 29th 12.8 +1.6 7.4 20th 68.8 16.0 v high 430%
Laverton Aero 29.1 +0.5 39.7 31st 14.9 +0.6 8.5 15th 24.6 14.0 high 176%
Leinster Aero 30.1 +0.1 39.2 31st 15.1 +0.1 9.9 19th 20.8 12.7 high 164%
Leonora Aero 29.1 -1.2 38.8 30th 15.0 -0.3 8.6 20th 21.0 11.9 high 176%
Munglinup West 22.2 -1.3 31.4 17th 10.3 +1.0 4.0 19th 37.0 39.4 average 94%
Norseman Aero 24.2 -1.8 33.7 29th 10.9 +1.4 4.7 23rd 82.8 24.4 v high 339%
Salmon Gums Res.Stn. 23.5 0.0 33.3 29th 10.0 +2.4 2.0 23rd 46.4 27.7 high 168%
Southern Cross Airfield 25.2 -1.4 34.6 29th 11.2 +1.8 4.8 20th 87.8 18.9 highest 465%
North East (district 13)
Carnegie 33.7 +0.6 40.2 31st 16.3 -0.2 10.6 20th 2.8 6.4 average 44%
Giles Meteorological Office 33.7 +1.9 39.1 25th 18.7 +1.4 13.3 17th 27.2 15.9 high 171%
Telfer Aero 38.6 +1.3 42.7 31st 22.3 +1.2 18.0 16th 0 3.1 lowest 0%
Warburton Airfield 34.1 +2.2 40.5 24th 17.9 +2.1 12.4 21st 20.4 14.3 high 143%
Wiluna 32.1 +1.7 40.0 31st 15.5 +1.6 10.5 3rd 23.0 7.4 v high 311%
Wiluna Aero 32.2   40.3 31st 15.7   10.7 15th 21.6
Offshore Islands (district 200)
Adele Island 29.7   31.3 8th     25.0 31st
Rowley Shoals 27.1   29.1 11th 24.9   23.2 26th

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 Thursday 1 November 2018. 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

Media
(03) 9669 4057
Enquiries