Western Australia in October 2019: very warm and dry

October 2019 was a very warm and dry month for Western Australia. Mean maximum temperatures were above average across the State, whilst mean minimum temperatures were above average for most of WA except in the Kimberley region. For the State as a whole, the mean maximum temperature was the second-highest in October on record, while mean minimum temperature was the third-highest. Monthly rainfall was below average across parts of the State's west and south. It was the State's tenth-driest October on record, and driest since 1979.

Dry in the west and south

  • It was the tenth-driest October on record, driest since 1979 for WA as a whole
  • The year-to-date rainfall was the third-lowest on record, lowest since 1936 for WA as a whole
  • Two-thirds of the State recorded no or little rainfall this October; Eucla had its lowest October rainfall for 56 years with 1.6 mm
  • Much of the South West Land Division (SWLD), the north Kimberley, and isolated spots in the central WA reported 10-25 mm rainfall totals, though the far southwest coastal areas had higher falls of 50-80 mm, and Wereroa claimed the wettest spot with 91.2 mm

Above average daytime temperatures across WA

  • The mean maximum temperature was 3.58 °C above average, the second-warmest October on record for WA
  • The mean minimum temperature was 1.99 °C above average, the third-warmest October on record for WA
  • It was the warmest year-to-date on record in terms of mean temperature and mean maximum temperature for WA; the state-wide averaged year-to-date mean temperature, mean maximum and minimum temperatures were +1.49 °C, +2.27 °C and +0.70 °C respectively
  • It was a record hot October in many locations in the northern half of WA; the month started with four or five consecutive 40 °C days in the Pilbara and west Kimberley and temperatures later peaked around the 20th (44.4 °C at Fitzroy Crossing Aero on the 20th was the State's highest temperature)
  • A record hot day occurred in the Goldfields on the 10th with temperatures well into the low 40s; for most of the SWLD the hottest day was on the 27th when temperatures climbed into the high 30s, including a record (38.0 °C) at Pearce RAAF
  • The end of the month saw hot days and warm nights in the Eucla district, in contrast to the wet and cold weather in the southwest. Forrest had its warmest October morning on record on the 31st with 24.2 °C, equalled the record at Forrest Aero (the old site) set on 26 October 1981
  • A number of sites in inland Pilbara and Southern Interior had their warmest October on record, while Kununurra Aero in the north Kimberley had its coolest October on record in terms of minimum temperatures

Severe wind gusts

  • A low pressure system moved through southwest Western Australia on the 4th and produced severe north-northwesterly wind gusts in the SWLD, mostly in Greater Perth. The highest wind gust of 107 km/h was recorded at Rottenest Island. The State emergency agency (DFES) received 173 calls for assistance for roof damage, trees down and water ingress

Further information

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Extremes in October 2019
Hottest day 44.4 °C at Fitzroy Crossing Aero on the 20th
Warmest days on average 41.9 °C at Fitzroy Crossing Aero
Coolest days on average 19.2 °C at Cape Leeuwin
Coldest day 12.7 °C at Shannon on the 31st
Coldest night -1.5 °C at Eyre on the 17th
Coolest nights on average 6.6 °C at Wandering
Warmest nights on average 26.5 °C at Troughton Island
25.3 °C at Argyle Aerodrome
Warmest night 29.2 °C at Karijini North on the 11th
29.2 °C at Argyle Aerodrome on the 20th
Warmest on average overall 32.8 °C at Argyle Aerodrome
32.8 °C at Fitzroy Crossing Aero
Coolest on average overall 14.1 °C at Shannon
Wettest overall 91.2 mm at Wereroa
Driest overall 0 mm at Curtin Aero and others
Wettest day 37.8 mm at Mount William on the 31st
Strongest wind gust 107 km/h at Rottnest Island on the 4th

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 lowest October total rainfall
New record
(mm)
Old
record
Years of
record
Average for
October
Forrest 0.6 = 0.6 in 2002 25 10.2

Lowest October total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
October
Eucla 1.6 0.5 in 1963* 18.1

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




Record highest October temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Pearce RAAF 38.0 on the 27th = 38.0 on the 29th in 1967 62 23.5
Laverton Aero 41.3 on the 10th 40.6 on the 8th in 2013 28 28.7
Leinster Aero 40.2 on the 10th = 40.2 on the 23rd in 2008 26 30.0
Barrow Island Airport 38.3 on the 11th 36.8 on the 7th in 2006 21 29.5
Norseman Aero 40.0 on the 10th 39.6 on the 31st in 2013 20 25.9



Record highest October mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Wiluna 35.3 = 35.3 in 2015 117 30.4
Port Hedland Airport 39.2 39.0 in 2015 71 35.0
Meekatharra Airport 34.3 34.1 in 2015 69 29.9
Giles Meteorological Office 36.4 36.1 in 2015 63 31.9
Warburton Airfield 37.1 36.7 in 2015 46 32.0
Learmonth Airport 36.2 = 36.2 in 2015 44 32.8
Telfer Aero 40.8 40.1 in 2015 43 37.3
Curtin Aero 40.9 40.6 in 2008 27 39.0
Paraburdoo Aero 38.6 = 38.6 in 2004 23 35.9
Newman Aero 38.1 37.6 in 2004 22 35.2

Highest October mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
October
Mandora 39.0 =39.0 in 1988 36.0



Record highest October daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Forrest 24.2 on the 31st 22.7 on the 30th in 2012 27 10.7
Paraburdoo Aero 27.5 on the 8th 27.3 on the 21st in 2008 24 18.3



Record highest October mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Warburton Airfield 21.3 20.9 in 2015 45 15.8
Telfer Aero 24.6 24.3 in 1991 43 21.1
Newman Aero 20.9 20.1 in 2012 22 17.7



Record lowest October mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Kununurra Aero 21.2 21.4 in 2012 33 23.4



Record highest October mean temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Meekatharra Airport 26.5 = 26.5 in 2015 69 22.6
Giles Meteorological Office 28.7 = 28.7 in 2015 63 24.6
Warburton Airfield 29.2 28.8 in 2015 45 23.9
Telfer Aero 32.7 32.1 in 1991 43 29.2
Paraburdoo Aero 29.0 28.7 in 2004 23 27.1
Newman Aero 29.5 28.6 in 2014 22 26.5



Summary statistics for October 2019
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
October
2019
Diff
from
average
Highest for
October
2019
Mean for
October
2019
Diff
from
average
Lowest for
October
2019
Total for
October
2019
Average
for
October
Rank of
October
2019
Fraction of
October
average
North Kimberley (district 01)
Kalumburu 38.5 +1.6 42.4 17th 21.4 -1.2 18.4 16th 33.4 37.1 average 90%
Troughton Island 32.0 +0.2 34.0 22nd 26.5 +0.1 25.0 18th 0 2.4 lowest 0%
Truscott 34.8 +0.5 39.0 11th 23.6 -1.0 21.9 27th 11.8 20.0 average 59%
Wyndham Aero 40.5 +1.0 42.8 12th 23.4 -1.5 18.7 3rd 18.4 19.1 high 96%
East Kimberley (district 02)
Argyle Aerodrome 40.1 +1.6 42.3 14th 25.3 +0.1 21.9 4th 4.2 31.4 low 13%
Halls Creek Airport 39.3   42.0 17th 21.1   15.0 11th 11.2
Kununurra Aero 39.9 +1.1 42.3 17th 21.2 -2.2 14.7 12th 27.6 21.9 high 126%
Warmun 40.1 +1.4 42.0 18th 23.0 0.0 17.0 12th 5.0 23.1 average 22%
West Kimberley (district 03)
Broome Airport 33.6 +0.6 42.6 22nd 22.9 +0.4 19.0 4th 1.2 1.4 high 86%
Curtin Aero 40.9 +1.9 43.6 20th 21.0 -0.8 16.7 11th 0 6.9 lowest 0%
Cygnet Bay 35.5 +1.2 38.4 10th 21.7 +0.1 18.6 15th 0 1.5 lowest 0%
Derby Aero 38.8 +1.5 43.8 20th 23.7 +0.5 20.0 14th 0 2.7 lowest 0%
Fitzroy Crossing Aero 41.9 +1.7 44.4 20th 23.7 +0.6 18.5 4th 1.4 14.9 average 9%
De Grey (district 04)
Bedout Island 32.2 +1.0 36.1 22nd 24.9 +0.6 23.1 6th
Karratha Aero 37.7 +3.6 42.3 22nd 22.4 +1.6 19.0 16th 0.2 0.4 high 50%
Legendre Island 31.7 +0.5 39.4 22nd 24.0 +0.6 22.1 15th
Mandora 39.0 +3.0 43.9 22nd 19.5 +0.3 14.9 11th 1.4 1.2 high 117%
Marble Bar 41.7 +2.9 43.2 11th 22.8 +1.0 18.4 15th 2.6 3.3 high 79%
Port Hedland Airport 39.2 +4.2 43.0 23rd 20.5 +1.9 17.7 11th 0 1.0 lowest 0%
Roebourne Aero 40.9 +3.4 44.3 22nd 20.3 +0.5 15.8 17th 0 1.5 v low 0%
Fortescue (district 05)
Barrow Island Airport 31.6 +2.1 38.3 11th 22.6 +0.9 20.1 26th 0 1.8 lowest 0%
Karijini North 39.4   41.0 11th 24.1   14.5 15th 1.6
Learmonth Airport 36.2 +3.4 40.4 10th 17.1 +0.7 14.2 1st 0 1.5 lowest 0%
Mardie 38.4 +3.4 44.1 11th 19.7 +2.2 17.0 1st 0 0.8 lowest 0%
Onslow Airport 36.8 +3.9 43.0 11th 20.1 +2.2 16.9 17th 0 0.8 lowest 0%
Thevenard Island 31.6 +1.9 37.3 11th 21.9 +1.2 18.7 18th 0 1.1 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 26.9 +0.8 34.0 26th 17.5 +1.1 14.5 3rd 0.2 4.9 low 4%
Denham 25.8 +0.1 29.0 26th     16.0 1st 1.0 5.9 average 17%
Shark Bay Airport 28.9 +0.6 37.6 26th 15.6 +0.2 12.8 30th 0.6 4.4 average 14%
East Gascoyne (district 07)
Newman Aero 38.1 +2.9 40.7 11th 20.9 +3.2 16.4 1st 0.4 5.8 average 7%
Paraburdoo Aero 38.6 +2.7 42.4 9th 19.4 +1.1 14.5 1st 0.4 3.9 average 10%
Murchison (district 07A)
Meekatharra Airport 34.3 +4.4 40.7 9th 18.6 +3.3 11.9 5th 0 6.0 lowest 0%
Mount Magnet Aero 32.3 +2.8 39.5 28th 16.3 +1.8 11.7 17th 2.0 7.2 average 28%
North Coast (district 08)
Dalwallinu 27.7 +1.2 37.1 27th 10.2 +0.5 4.8 25th 17.2 14.0 high 123%
Geraldton Airport 26.5   39.8 27th 11.9   7.8 2nd 13.6
Kalbarri 26.6 +0.3 33.2 26th 13.5 +0.8 8.2 14th 4.3 13.6 low 32%
Morawa Airport 29.7 +1.4 38.8 27th 11.6 +0.5 6.9 14th 4.4 8.9 average 49%
Mullewa 29.9 +2.6 38.7 27th 12.6 +1.4 6.2 25th 4.8 12.7 low 38%
North Island 24.0 +0.4 26.1 8th 17.7 +0.5 15.0 4th 8.8 6.4 high 138%
Wongan Hills 27.2 +1.9 36.7 27th 10.7 +0.6 6.3 15th 27.6 19.8 high 139%
Central Coast (district 09)
Badgingarra Research Stn 26.5 +2.0 38.0 27th 10.5 +1.1 5.3 13th 12.0 27.1 low 44%
Bickley 21.6 +0.4 33.3 27th 10.3 +0.6 5.8 15th 65.4 66.1 average 99%
Garden Island HSF 21.5 +0.5 33.0 27th 14.3 +0.6 10.7 15th 25.4 27.2 average 93%
Gingin Aero 25.4 +1.1 38.2 27th 9.0 -0.3 3.0 16th 28.8 34.6 average 83%
Jandakot Aero 23.9 +1.0 36.4 27th 10.3 +0.5 4.3 15th 36.4 46.0 average 79%
Jurien Bay 24.2 +0.8 33.9 19th 11.8 +0.5 7.9 13th 14.4 25.1 low 57%
Lancelin 22.8 +0.3 36.4 19th 12.4 +0.3 8.3 7th 34.6 28.6 high 121%
Millendon (Swan Valley) 25.1   37.0 27th 10.3   5.2 17th 30.2
Pearce RAAF 25.6 +2.1 38.0 27th 10.5 +0.3 4.4 16th 23.2 35.8 average 65%
Perth Airport 24.7 +1.9 37.3 27th 10.6 +0.3 4.5 16th 23.0 43.0 low 53%
Perth Metro 24.0 +0.6 36.5 27th 12.1 +0.5 6.5 15th
Rottnest Island 21.3 +0.7 32.4 27th 14.8 +0.8 10.4 31st 25.6 28.2 average 91%
Swanbourne 22.6 +0.3 34.7 27th 13.2 +0.8 8.8 15th 30.4 41.9 average 73%
South Coast (district 09A)
Albany 19.3 +0.8 26.2 30th 12.2 +1.7 8.2 13th 56.4 78.2 low 72%
Albany Airport 20.6   31.2 20th 10.3   5.4 19th 46.8
Bridgetown 21.2 +0.7 30.9 27th 7.6 +0.4 0.9 15th 36.6 42.4 average 86%
Bunbury 21.2 +0.1 28.7 19th 9.9 +0.3 2.6 15th 53.2 33.1 high 161%
Busselton Aero 21.8 +0.5 29.9 27th 9.1 +0.4 3.4 17th 53.0 31.3 high 169%
Cape Leeuwin 19.2 +0.9 22.1 27th 13.8 +1.2 8.6 31st 47.8 63.9 average 75%
Cape Naturaliste 20.9 +2.0 27.2 27th 12.1 +1.1 9.0 31st 50.6 48.9 average 103%
Collie East 22.6 +0.9 33.0 27th 7.7 +0.1 0.7 15th 28.2 40.5 low 70%
Dwellingup 21.7 +1.6 33.2 27th 9.0 +0.9 3.1 15th 60.6 78.7 average 77%
Esperance 22.5 +1.3 37.3 28th 11.8 +0.9 6.4 17th 36.8 46.9 average 78%
Esperance Aero 23.5 +1.9 37.3 28th 10.5 +0.7 5.6 17th 41.2 46.3 average 89%
Hopetoun North 22.2 +0.8 33.9 20th 11.4 +1.1 6.3 17th 44.2 39.5 average 112%
Mandurah 22.2 +0.3 32.6 27th 13.9 +0.4 9.1 15th 32.4 30.8 average 105%
Manjimup 20.8 +1.9 31.6 27th 9.4 +1.1 5.2 19th 45.2 74.5 low 61%
North Walpole 19.6 +0.6 26.3 27th 10.9 +0.4 6.4 19th 55.6 78.1 low 71%
Rocky Gully 20.3 +1.0 31.8 27th 8.6 +0.5 4.4 15th 44.6 54.3 average 82%
Shannon 19.3 +0.5 30.0 27th 9.0 +0.6 4.4 17th 68.8 74.4 average 92%
Witchcliffe 20.2 +0.6 29.5 27th 9.8 +0.4 4.0 19th 78.6 62.8 high 125%
North Central (district 10)
Bencubbin 27.2 +2.0 35.7 9th 11.8 +1.9 7.5 17th 21.7 15.7 high 138%
Cunderdin Airfield 27.6 +1.6 36.8 27th 8.5 +0.4 2.3 17th 19.6 18.4 average 107%
Merredin 27.2 +2.2 36.1 9th 11.9 +2.1 7.4 13th 20.6 18.7 average 110%
York     36.5 27th 7.4 +0.1 1.9 16th 17.1 22.7 average 75%
South Central (district 10A)
Brookton 25.2 +1.8 35.0 27th 8.2 +0.7 2.9 16th 9.8 25.2 low 39%
Hyden 27.6 +2.7 36.8 9th 9.7 +1.3 3.5 7th 21.1 21.6 average 98%
Jacup 24.4 +2.5 35.0 20th 8.6 +0.8 2.7 6th 19.2 38.5 low 50%
Katanning 23.0 +1.1 33.2 27th 8.7 +1.1 3.6 15th 25.6 30.5 average 84%
Lake Grace 25.0 +1.6 33.7 27th 10.3 +1.2 4.6 6th 23.2 26.1 average 89%
Ravensthorpe 24.7 +2.2 35.5 20th     7.0 1st 29.6 38.1 average 78%
Wandering 23.6 +1.2 34.0 27th 6.6 +0.2 0.4 15th 23.8 28.3 average 84%
Eucla (district 11)
Eucla 26.3 +3.2 37.9 30th 13.0 +1.7 4.2 17th 1.6 18.1 v low 9%
Eyre 25.4 +2.1 41.8 30th 11.0 +0.9 -1.5 17th 10.0 19.6 average 51%
Forrest 31.5 +4.0 41.8 3rd 12.1 +1.4 5.0 17th 0.6 10.2 lowest 6%
Red Rocks Point 22.3 -0.7 36.5 28th 13.3 +1.0 5.3 17th 1.6 17.0 v low 9%
South East (district 12)
Kalgoorlie-Boulder Airport 29.8 +3.9 39.2 10th 13.9 +2.7 8.7 6th 2.2 15.8 low 14%
Laverton Aero 33.3 +4.6 41.3 10th 17.5 +3.1 11.6 25th 4.6 13.6 average 34%
Leinster Aero 33.6 +3.6 40.2 10th 17.8 +2.8 12.1 16th 0 12.2 lowest 0%
Leonora Aero 33.3 +3.1 40.6 10th 17.3 +2.0 11.5 17th 0 11.0 v low 0%
Munglinup West 24.6 +1.2 37.2 28th 9.6 +0.2 4.8 19th 33.8 39.0 average 87%
Norseman Aero 28.2 +2.3 40.0 10th 11.0 +1.5 2.6 7th 8.2 23.6 low 35%
Salmon Gums Res.Stn. 26.4 +2.9 38.8 28th 9.3 +1.7 0.9 7th 21.2 27.6 average 77%
Southern Cross Airfield 28.7 +2.2 39.4 28th 11.5 +2.1 6.0 16th 14.0 18.7 average 75%
North East (district 13)
Giles Meteorological Office 36.4 +4.5 39.9 12th 21.0 +3.7 14.9 17th 0.2 15.7 low 1%
Telfer Aero 40.8 +3.5 42.4 11th 24.6 +3.5 20.2 2nd 0.2 3.0 average 7%
Warburton Airfield 37.1 +5.1 41.8 3rd 21.3 +5.5 14.5 17th 0.4 14.0 low 3%
Wiluna 35.3 +4.9 41.0 10th 16.7 +2.8 12.0 1st 1.0 7.3 average 14%
Wiluna Aero 35.5   41.1 9th 18.2   13.2 1st 0.2
Offshore Islands (district 200)
Adele Island 30.9   33.1 11th 26.0   25.2 11th
Browse Island 30.3   32.5 21st 26.9   25.8 15th
Rowley Shoals 28.4   31.2 23rd 25.9   24.9 14th
Varanus Island 30.4 +1.2 33.6 11th 23.5 +0.9 21.1 14th 0 1.0 lowest 0%

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 Friday 1 November 2019. 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