Tuesday, 2 June 2009 - Seasonal Climate Summary for Western Australia - Product code IDCKGC11R0
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.
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.
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).
|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|
Lowest daily maximum temperature
|10.3°C at Rocky Gully on 22 May|
|−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|
Highest daily minimum temperature
|30.1°C at Roebourne Aero on 3 Apr|
Highest total rainfall
|202.0 mm at Denmark|
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|
|Record lowest total autumn rainfall|
| Total rainfall
for autumn 2009 (mm)
| Previous lowest
|Cape Leeuwin||81.8||85.0||in 2006||113||227.7|
|Cape Naturaliste||57.2||70.8||in 1982||106||182.7|
|Lake Grace Comparison||12.4||16.8||in 2000||97||89.2|
|Salmon Gums Res.Stn.||2.4||14.4||in 1946||77||86.6|
|Amrista Park||26.8||31.3||in 1959||54||84.0|
|Record highest autumn daily minimum temperature|
| Highest daily minimum
in autumn 2009 (°C)
| Previous highest
|Troughton Island||29.8||on 17 Apr||29.7||on 18 Apr 1998||31||26.1|
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.