Tuesday, 2 June 2009 - Seasonal Climate Summary for Western Australia - Product code IDCKGC11R0

Western Australia in autumn 2009
A dry autumn in WA


Summary

  • WA statewide rainfall below average.
  • Near average mean maximum temperature for WA.
  • Near average mean minimum temperature for WA.

Details

Rainfall

Autumn 2009 was a dry autumn for WA. The Kimberley and western parts of the state from the west Pilbara, and Gascoyne down to the Southwest Land Division (SWLD), received below to very much below average autumn rainfall. Many locations in the SWLD registered their driest autumn on record (see autumn 2009 rainfall deciles map). An early end to the wet season in the north along with very few significant cold fronts in the south combined to produced a below average month for rainfall statewide.

Maximum temperature

Mean maximum temperatures in autumn 2009 were above to very much above average across a large area of WA, including the Kimberley, northern interior, and western parts of the state, with up to 3°C warmer than normal mean maxima in the Shark Bay region of the Gascoyne (see autumn 2009 maximum temperate anomaly map). The mean maximum temperature averaged across the state however was near the long-term average.

Minimum temperature

Most parts of WA saw near average mean minima across autumn, however pockets of below to very much much below average minimum temperatures were observed in the western Eucla and west Gascoyne, with means to 2ºC below normal, whilst above average maxima were recorded in the parts of the northern Interior and eastern Eucla. The statewide mean minimum temperature was near average (see autumn 2009 minimum temperate anomaly map).

Further information

Western Australia Climate Services Centre
Bureau of Meteorology
Phone (08) 9263 2222
Email climate.wa@bom.gov.au

Extremes

Hottest day
Highest temperature
44.5°C at Onslow on 28 Mar
Warmest days on average
Highest mean daily maximum temperature
36.7°C at Wyndham Aero
Coolest days on average
Lowest mean daily maximum temperature
21.0°C at Albany
Coldest day
Lowest daily maximum temperature
10.3°C at Rocky Gully on 22 May
Coldest night
Lowest temperature
−1.4°C at Eyre on 29 May
Coolest nights on average
Lowest mean daily minimum temperature
7.4°C at Collie East
Warmest nights on average
Highest mean daily minimum temperature
27.3°C at Troughton Island
Warmest night
Highest daily minimum temperature
30.1°C at Roebourne Aero on 3 Apr
Wettest overall
Highest total rainfall
202.0 mm at Denmark
Wettest day
Highest daily rainfall
137.0 mm at Marble Bar (DoW) on 1 Mar
Highest wind gust
115 km/h at Rottnest Island on 21 May

Records




Record lowest total autumn rainfall
Total rainfall
for autumn 2009 (mm)
Previous lowest
for autumn
Years of
record
Average for
autumn
Pinjarra 70.2 73.4 in 1940 130 199.7
Jarrahdale 72.4 86.0 in 1982 124 241.0
Cape Leeuwin 81.8 85.0 in 2006 113 227.7
Boyanup 56.2 84.2 in 1982 110 207.8
Cape Naturaliste 57.2 70.8 in 1982 106 182.7
Lake Grace Comparison 12.4 16.8 in 2000 97 89.2
Serpentine 54.4 72.4 in 1914 85 201.6
Hyden 18.2 23.1 in 1948 79 83.1
Salmon Gums Res.Stn. 2.4 14.4 in 1946 77 86.6
Dwellingup 82.0 92.7 in 1982 76 252.8
Amrista Park 26.8 31.3 in 1959 54 84.0
Gidgegannup 71.4 72.2 in 1982 48 178.2
Karnet 75.2 84.2 in 2006 45 234.5





Record highest autumn daily minimum temperature
Highest daily minimum
temperature
in autumn 2009 (°C)
Previous highest
for autumn
Years of
record
Average for
autumn
Troughton Island 29.8 on 17 Apr 29.7 on 18 Apr 1998 31 26.1




Notes

This statement has been prepared based on information available at 9 am on Tuesday 2 June 2009. 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 5 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

Further information

Western Australia Climate Services Centre
Bureau of Meteorology
Phone (08) 9263 2222
Email climate.wa@bom.gov.au