What is the average annual rainfall in Western Australia contributing to its sparse population?

Western Australia experiences an average annual rainfall of 500mm or less in many regions, particularly in the interior and arid zones. This low rainfall significantly impacts the environment, making it less conducive to supporting large populations. Areas with sparse rainfall often face challenges such as water scarcity, limited agricultural production, and difficulties in sustaining diverse ecosystems. Consequently, these factors contribute to a lower population density in these regions, as fewer people can rely on the land for farming, water resources, or other livelihoods.

In contrast, regions with higher rainfall averages tend to be more hospitable, providing better conditions for habitation and agriculture, which would lead to a higher population density. Thus, the characteristic of having an average annual rainfall of 500mm or less is a key factor in understanding the demographic patterns in Western Australia.