In 1995, 1.26 million people, representing nearly 73% of the total populations of Western Australia, lived in the Perth Metropolitan Area. The area covers about 5,457 square kilometres, extending from Wanneroo in the north to Rockingham in the south and taking in all the lands between the Darling Ranges and the Indian Ocean.
Maximum average temperatures range from 32.7 (celsius) in January and February to 17.6 in July, with summer heat-waves of 38 degree plus (100 F) often occurring over 3 to 5 days several times a year.
Minimum average temperatures range from 7.9 (celsius) in August to 17.4 in February.
Mean rainfall is 799 mm.
(source: Western Australian Year Book 1997: Australian Bureau of Statistics)