Western Australia in December 2014: A dry and warm month

Mean maximum temperatures were above to very much above average across large parts of WA in December, and a few sites in the Pilbara, Southern Interior, and northern Goldfields registered record high mean maxima in December, with mean maximum temperatures 3 °C to 4 °C above average in the western Southern Interior. Only parts of the south coast, west Pilbara coast, and east Kimberley recorded below average day-time temperatures. Averaged across the State, the mean maximum temperature was 0.99 °C above the long-term average, and thus well-above average, whilst averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the December mean maximum for the region was near average.

Mean minimum temperatures were above to very much above average across much of the northern, central and eastern WA, with a couple of sites in the Kimberley registering their highest mean minimum temperatures on record. Below average mean minimum temperatures were recorded near the Southwest Land Division (SWLD) south coast, and in the east Kimberley. Averaged across the State, the mean minimum temperature was 0.41 ° C above the long-term average, and well above average, whilst for the Lower Southwest the mean minimum was close to average.

Rainfall in December 2014 was below to very much below average in parts of western and central WA. Areas of above average rainfall were scattered through the Kimberley, Northern and Southern Interior, and in the South and Southeast Coastal and western Eucla. December 2014 was near average for the state as a whole in terms of rainfall, but the driest December for ten years, since December 2004. For both the SWLD and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), rainfall in December 2014 was below average, and the driest since 2009.

  • Very high temperatures across parts of the northern half of WA from the 4th to 9th saw Giles Meterological Office record a maximum temperature of 45.1 °C on the 5th, the highest December temperature in 59 years of record at the site, and the third highest temperature on record at the station, whilst Pardoo recorded a maximum temperature of 48.0 °C on the 6th, the highest temperature at the site in 22 years of recording, and the highest temperature recorded in WA in December 2014.
  • A fire at Whiteman Park in the northern Perth suburbs burnt 367 hectares of bushland on 14 December.
  • Twenty-two consecutive days with temperatures at or above 40 °C at Marble Bar from the 1st to 23rd: longest such run in December for 9 years.
  • A bushfire destroyed a home and three sheds in Toodyay, about 85 kilometres north-east of Perth, on 30 December.
  • High overnight temperatures were reported in various parts of the State in the last 10 days of the month with Denham in the Gascoyne, Port Hedland in the Pilbara, and Salmon Gums Research Station in the Southeast Coastal all registering their highest December minimum temperatures on record.

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Extremes in December 2014
Hottest day 48.0 °C at Pardoo Station on the 6th
Warmest days on average 42.9 °C at Marble Bar
Coolest days on average 20.9 °C at Albany
Coldest day 16.2 °C at Mount Barker on the 9th
Coldest night 2.3 °C at Salmon Gums Res.Stn. on the 14th
Coolest nights on average 10.0 °C at Rocky Gully
Warmest nights on average 28.4 °C at Browse Island
27.6 °C at Wyndham
Warmest night 32.8 °C at Wittenoom on the 6th
Warmest on average overall 34.6 °C at Marble Bar
Coolest on average overall 17.0 °C at North Walpole
17.0 °C at Shannon
Wettest overall 325.1 mm at Kachana
Wettest day 87.2 mm at Bedford Downs Airstrip on the 12th
Strongest wind gust 91 km/h at Giles Meteorological Office on the 15th

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 December total rainfall
New record
(mm)
Old
record
Years of
record
Average for
December
Forrest 0.0 3.4 in 2004 20 25.1

Lowest December total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Years since
lower
Average for
December
Newdegate Research Station 1.4 1.2 in 1981 33 14.9



Record highest December temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Giles Meteorological Office 45.1 on the 5th 44.8 on the 27th in 1986 59 35.7
Pardoo Station 48.0 on the 6th 46.5 on the 19th in 2004 22 36.4



Record highest December mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Wittenoom 41.8 = 41.8 in 1997 62 39.6
Carnegie 40.0 39.6 in 1997 25 37.3
Laverton Aero 36.0 35.7 in 2012 23 33.5
Pardoo Station 38.8 = 38.8 in 2009 21 36.4

Highest December mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Years since
higher
Average for
December
Giles Meteorological Office 38.1 38.4 in 1990 24 35.7



Record highest December daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Salmon Gums Res.Stn. 26.4 on the 31st 26.0 on the 13th in 2002 76 12.2
Port Hedland Airport 30.1 on the 26th 30.0 on the 19th in 2004 67 24.1
Balgo Hills 31.3 on the 4th 31.0 on the 27th in 1996 29 25.0
Denham 28.0 on the 22nd 27.4 on the 27th in 2010 27 20.5



Record highest December mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Bidyadanga 27.2 27.1 in 2012 55 25.7
Mount Elizabeth 23.1 = 23.1 in 2003 21 22.3

Highest December mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Years since
higher
Average for
December
Kununurra Aero 26.2 26.9 in 1992 22 25.4



Highest December mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Years since
higher
Average for
December
Carnegie 31.8 32.2 in 1989 25 29.6
Giles Meteorological Office 30.7 31.0 in 1990 24 28.8
Telfer Aero 34.1 =34.1 in 1991 23 32.8



Summary statistics for December 2014
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
December
2014
Diff
from
average
Highest for
December
2014
Mean for
December
2014
Diff
from
average
Lowest for
December
2014
Total for
December
2014
Average
for
December
Rank of
December
2014
Fraction of
December
average
North Kimberley (district 01)
Doongan 34.8 +0.4 38.2 3rd 23.6 +0.5 21.5 7th 201.8 222.5 average 91%
Kalumburu 35.0 -0.3 37.3 15th 25.1 +0.2 23.0 10th 224.6 234.7 average 96%
Mount Elizabeth 34.9 +0.9 38.7 5th 23.1 +0.8 19.9 28th 154.3 166.0 average 93%
Troughton Island 33.4 +0.4 34.8 3rd 28.1 +0.8 23.8 5th 70.6 117.5 average 60%
Truscott 34.1 -0.1 36.1 3rd 26.3 +0.3 23.3 31st 146.2 205.5 low 71%
Wyndham 37.7 -0.4 42.0 15th 27.6 +0.6 23.3 4th 195.8 156.9 high 125%
Wyndham Aero 38.3 +0.4 43.3 15th 26.9 +0.2 23.2 4th 208.2 140.8 high 148%
East Kimberley (district 02)
Argyle Aerodrome 37.1 -0.1 40.8 16th 26.1 +0.2 23.2 24th 173.6 139.6 high 124%
Halls Creek Airport 37.4 -0.4 42.2 4th 24.8 +0.1 19.6 27th 115.2 82.9 average 139%
Kununurra Aero 38.1 +1.0 44.2 15th 26.2 +0.8 22.5 4th 131.8 136.6 average 96%
Warmun 37.1 -1.3 41.0 5th 24.9 -0.3 22.3 8th 267.1 117.4 v high 228%
West Kimberley (district 03)
Bidyadanga 35.6 +0.6 42.2 29th 27.2 +1.5 24.7 11th 31.2 55.4 average 56%
Broome Airport 35.1 +1.2 40.5 29th 27.4 +0.9 22.8 11th 66.0 57.7 average 114%
Curtin Aero 38.3 0.0 43.3 4th 25.5 +0.5 21.3 25th 211.0 151.3 high 139%
Derby Aero 37.5 +0.3 40.7 5th 26.3 +0.1 22.0 13th 158.6 73.1 high 217%
Fitzroy Crossing Aero 39.2 +0.1 45.6 5th 26.0 +0.3 22.7 17th 152.2 125.1 high 122%
De Grey (district 04)
Bedout Island 34.6   38.0 29th 27.2   25.6 2nd
Karratha Aero 36.4 +0.6 43.0 30th 25.3 -0.2 21.8 1st 0 14.6 lowest 0%
Legendre Island 32.5   39.3 28th 25.4   22.4 1st
Mandora 37.6 +0.8 44.2 30th 25.8 +1.4 18.9 30th 39.6 34.3 high 115%
Marble Bar 42.9 +1.4 47.9 8th 26.4 +0.3 22.0 2nd 10.4 35.5 low 29%
Pardoo Station 38.8 +2.4 48.0 6th 25.4 +0.6 22.4 3rd 1.0 24.1 average 4%
Port Hedland Airport 38.4 +1.8 47.7 6th 25.0 +0.9 21.0 30th 0.2 19.2 average 1%
Roebourne 40.5 +1.5 47.7 7th 24.7 -0.2 20.5 2nd 0 12.2 lowest 0%
Roebourne Aero 40.2 +1.0 46.9 6th 24.8 +0.1 20.1 2nd 0 15.6 v low 0%
Fortescue (district 05)
Barrow Island Airport 32.4 +0.2 40.3 30th 24.0 -0.5 22.0 1st 0 6.3 v low 0%
Learmonth Airport 38.0 +1.2 42.6 30th 20.7 -0.2 17.5 4th 0 6.4 lowest 0%
Mardie 37.7 +0.1 44.9 30th 23.7 +0.7 19.0 2nd 0 8.9 lowest 0%
Onslow Airport 36.0 +0.1 45.1 31st 22.7 +0.4 19.4 3rd 0 3.5 lowest 0%
Wittenoom 41.8 +2.2 46.0 7th 25.7 +0.3 21.7 25th 24.4 50.2 average 49%
West Gascoyne (district 06)
Carnarvon Airport 30.4 +1.1 41.5 28th 20.7 0.0 17.8 25th 0 5.5 lowest 0%
Denham 29.6 +0.4 42.0 27th 20.8 +0.3 18.0 14th 0 2.3 lowest 0%
Emu Creek Station 41.0 +1.1 44.8 30th 22.1 -0.3 18.0 1st 0 13.0 lowest 0%
Murchison 37.4 0.0 43.0 30th 19.9 -0.3 16.0 2nd 6.0 14.0 average 43%
Shark Bay Airport 32.0 -0.3 42.8 27th 19.7 0.0 16.8 4th 0 11.2 v low 0%
East Gascoyne (district 07)
Newman Aero 41.0 +2.2 44.8 13th 24.8 +1.0 19.1 28th 11.2 38.2 average 29%
Paraburdoo Aero 42.0 +1.8 44.9 14th 24.5 0.0 19.2 2nd 0.2 28.3 v low 1%
Murchison (district 07A)
Meekatharra Airport 38.4 +2.0 43.9 12th 23.1 +1.0 18.9 2nd 2.2 15.1 low 15%
Mount Magnet Aero 36.8 +1.2 43.2 12th 21.2 +0.1 16.7 1st 2.8 22.7 low 12%
Paynes Find 35.9 +1.0 43.2 30th 18.7 +0.3 14.1 16th 8.4 12.8 average 66%
North Coast (district 08)
Dalwallinu 33.0 -0.2 43.6 30th 15.4 -0.4 10.9 17th 0.2 14.2 low 1%
Geraldton Airport 30.0   39.3 24th 15.6   10.6 16th 0
Kalbarri 30.9 -0.3 40.2 26th 17.9 +0.4 12.0 4th 0 3.8 lowest 0%
Morawa Airport 35.2 0.0 43.8 30th 16.8 -0.7 12.2 4th 0 14.5 v low 0%
Mullewa 34.8 +0.4 44.0 30th 17.5 +0.5 12.3 17th 1.0 8.4 average 12%
North Island 27.7 +1.2 31.7 27th 21.5 +1.6 20.2 9th 0 3.7 v low 0%
Wongan Hills 32.6 +0.1 43.7 30th 15.1 -0.7 10.5 10th 7.0 10.1 average 69%
Central Coast (district 09)
Badgingarra Research Stn 31.0 -1.0 41.6 19th 14.3 -0.7 10.3 2nd 0 9.5 lowest 0%
Bickley 27.7 -0.4 38.0 30th 13.1 -0.6 8.9 17th 0.2 13.1 v low 2%
Garden Island HSF 24.9 -0.6 32.5 29th 16.7 -0.5 13.5 2nd 0.2 11.6 v low 2%
Gingin Aero 29.9 -0.8 41.8 30th 13.8 -0.6 9.3 3rd 0 9.7 v low 0%
Gosnells City 29.9 -0.6 40.5 30th 15.7 -0.6 11.4 9th 0.1 11.4 low 1%
Jandakot Aero 29.0 -0.1 38.5 30th 14.0 -0.7 9.1 16th 0 10.5 lowest 0%
Jurien Bay 28.4 +0.2 37.6 19th 15.3 -0.3 10.2 10th 9.1 7.2 high 126%
Karnet 27.6 -0.6 38.0 30th 13.0 -0.5 8.4 16th 1.1 17.8 low 6%
Lancelin 28.8 +1.5 36.0 29th 15.8 -0.4 10.5 10th 0 8.1 lowest 0%
Pearce RAAF 31.1 +0.8 43.4 30th 13.9 -0.6 8.9 16th 0 10.4 lowest 0%
Perth Airport 29.7 +0.7 41.5 30th 14.9 0.0 10.4 14th 0.2 11.1 v low 2%
Perth Metro 28.9 -0.2 39.3 30th 15.8 -0.6 11.6 14th 0 9.9 lowest 0%
Rottnest Island 24.6 -0.5 31.3 27th 17.2 -0.4 13.8 10th 0 10.4 lowest 0%
Swanbourne 28.1 +0.1 38.8 19th 15.7 -0.8 11.9 14th 0.2 11.8 low 2%
South Coast (district 09A)
Albany 20.9 -1.0 25.8 3rd 14.5 +0.5 10.0 27th 11.9 29.9 low 40%
Albany Airport 22.6   29.3 3rd 11.6   6.1 18th 11.0
Bridgetown 27.1 -0.3 37.5 30th 10.5 -0.6 4.0 2nd 2.2 18.3 low 12%
Bunbury 27.2 -0.1 34.7 30th 12.6 -1.0 8.1 16th 0.4 19.6 low 2%
Busselton Aero 27.3 -0.7 36.0 19th 10.9 -1.6 3.7 2nd 1.8 9.4 low 19%
Cape Leeuwin 21.7 -0.1 24.1 11th 15.9 +0.1 14.0 2nd 3.0 20.6 v low 15%
Cape Naturaliste 24.2 +0.6 29.9 30th 13.2 -0.7 8.8 2nd 1.0 13.6 v low 7%
Collie East 28.2 -0.3 37.7 30th 10.8 -0.8 5.1 2nd 1.4 23.0 v low 6%
Donnybrook 28.5 +0.3 38.5 30th 12.9 +0.5 6.8 2nd 4.4 16.4 low 27%
Dwellingup 28.2 +0.9 38.1 19th 12.3 -0.3 7.0 16th 2.6 20.4 low 13%
Esperance 23.8 -0.8 36.5 12th 14.5 +0.1 10.0 3rd 20.0 19.1 average 105%
Esperance Aero 25.9 +0.2 37.2 12th 13.3 -0.1 8.6 17th 23.0 20.8 average 111%
Hopetoun North 22.9 -1.3 35.6 12th 14.0 +0.2 8.3 14th 51.0 25.7 high 198%
Jarrahwood 27.6 +0.6 37.7 30th 10.1 -1.1 3.0 2nd 2.6 16.7 low 16%
Mandurah 27.2 +0.2 36.5 19th 16.5 -0.7 12.9 2nd 0.6 18.0 v low 3%
Manjimup 25.2 +0.3 36.1 19th 11.2 -0.5 7.5 2nd 8.2 25.1 low 33%
North Walpole 21.7 -0.7 27.3 30th 12.3 -0.7 7.9 14th 24.6 41.1 average 60%
Pemberton 23.8 -0.1 34.6 19th     6.8 22nd 10.2 34.1 low 30%
Rocky Gully 24.2 -1.4 35.5 30th 10.0 -1.1 5.0 14th 6.4 30.6 low 21%
Shannon 23.4 -1.0 34.2 19th 10.6 -0.7 5.0 14th 7.6 28.1 low 27%
Witchcliffe 23.7 -1.1 30.0 19th 12.1 -0.3 6.2 14th 2.4 14.2 low 17%
North Central (district 10)
Bencubbin 32.2 -0.3 42.0 30th 16.0 0.0 11.1 10th 8.5 13.4 average 63%
Cunderdin Airfield 32.9 +0.1 44.8 30th 14.7 -0.1 11.1 10th 2.0 8.4 low 24%
Merredin 32.9 +0.9 42.0 30th 15.6 -0.2 10.0 26th 5.2 14.1 average 37%
Northam 32.3 +0.2 44.6 30th 15.1 -0.2 11.5 10th 0 9.3 lowest 0%
York 32.3 +0.1 44.1 30th 13.3 -0.7 8.5 16th 0 11.3 v low 0%
South Central (district 10A)
Beverley 32.6 +0.4 44.2 30th 13.8 -0.6 8.6 10th 0 10.2 lowest 0%
Brookton 30.7 -0.3 43.2 30th 13.4 -0.1 9.4 10th 0.3 10.2 low 3%
Corrigin 31.0 +0.6 43.2 30th 13.4 -0.6 9.6 14th 0 13.0 lowest 0%
Hyden 31.5 -0.3 43.6 30th 13.2 -0.7 9.2 14th 1.4 14.9 low 9%
Jacup 26.1 0.0 36.0 12th 11.0 -0.5 5.0 14th 38.0 27.1 average 140%
Katanning 28.2 -0.4 42.3 30th 11.3 -0.4 5.7 2nd 6.6 24.9 average 27%
Lake Grace 28.7 -0.7 41.8 30th 12.8 -0.7 8.9 16th 1.0 18.3 v low 5%
Narembeen 32.0 +0.1 42.6 30th 14.4 -0.1 10.9 14th 1.2 12.8 low 9%
Narrogin 29.0 +0.1 42.0 30th 12.9 +0.6 8.5 2nd 1.0 14.1 low 7%
Newdegate Research Station 29.3 0.0 42.3 30th 10.8 -1.0 4.7 16th 1.4 14.9 v low 9%
Ongerup 26.7 -0.5 40.4 30th 11.3 -1.1 6.5 14th 19.8 17.3 average 114%
Pingelly 30.1 +0.1 42.9 30th 13.7 -0.2 9.6 16th 0.6 12.5 low 5%
Ravensthorpe 25.6 -1.6 37.6 30th 12.4 -0.4 7.5 14th 64.5 23.9 v high 270%
Wagin 28.8 -0.4 42.2 30th 12.6 -0.4 7.8 16th 0.8 13.0 low 6%
Wandering 30.0 -0.3 42.7 30th 11.0 -1.0 5.6 16th 0.8 17.4 low 5%
Eucla (district 11)
Balladonia 29.7 -0.5 40.3 31st 13.0 -0.3 8.8 3rd 39.1 18.9 high 207%
Eucla 25.3 +0.4 35.5 31st 15.5 +0.5 9.2 28th 8.8 18.4 average 48%
Eyre 27.7 +2.3 38.3 1st 13.9 -0.2 4.0 19th 27.4 20.5 high 134%
Forrest 32.1 +0.8 44.4 9th 14.5 -0.4 10.1 27th 0 25.1 lowest 0%
Red Rocks Point 24.4 0.0 33.8 31st 16.5 +0.1 11.5 28th 6.0 20.2 low 30%
South East (district 12)
Bulga Downs 36.9 +1.1 44.0 31st 20.8 +0.8 16.0 10th 1.4 13.4 low 10%
Kalgoorlie-Boulder Airport 32.7 +0.7 42.5 31st 16.8 +0.2 12.3 26th 0.8 16.0 v low 5%
Laverton Aero 36.0 +2.5 42.1 31st 20.0 +0.4 14.2 26th 6.4 28.6 low 22%
Leinster Aero 36.8 +1.6 43.7 12th 21.5 +0.4 17.4 27th 13.2 26.7 average 49%
Leonora Aero 36.0   43.1 31st 20.9   15.7 10th 6.2
Munglinup West 26.7 -0.8 38.5 30th 12.1 -0.6 8.0 14th 36.4 27.7 average 131%
Norseman Aero 30.7 -0.3 40.6 31st 13.6 -0.3 7.2 26th 12.6 22.9 average 55%
Salmon Gums Res.Stn. 29.0 0.0 38.0 30th 11.2 -1.0 2.3 14th 19.8 20.0 average 99%
Southern Cross Airfield 32.9 +0.1 41.1 12th 15.8 +0.4 11.6 14th 5.2 16.0 average 33%
Yeelirrie 38.2 +2.1 44.5 12th 20.5 +0.6 13.5 28th 0.2 20.2 low 1%
North East (district 13)
Carnegie 40.0 +2.7 45.1 13th 23.7 +1.7 17.1 29th 18.7 23.9 average 78%
Giles Meteorological Office 38.1 +2.4 45.1 5th 23.2 +1.3 17.2 28th 82.0 45.7 high 179%
Telfer Aero 41.5 +1.3 47.1 7th 26.7 +1.3 22.9 20th 36.4 47.6 average 76%
Warburton Airfield 38.3 +1.7 45.4 9th 23.2 +1.9 17.7 26th 37.6 31.4 high 120%
Wiluna 39.2 +2.4 44.5 12th     16.0 31st 2.5 22.3 low 11%
Offshore Islands (district 200)
Adele Island 32.0   34.2 27th 28.0   25.0 30th
Browse Island 31.5   34.0 29th 28.4   24.3 12th
Christmas Island Aero 28.2 +0.5 29.7 25th 23.2 +0.6 20.8 29th 276.8 222.3 average 125%
Cocos Island Airport 29.8 +0.4 30.9 5th 25.4 +0.8 23.4 25th 232.0 117.9 high 197%

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.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 9am on Tuesday 6 January 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
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Enquiries