Mediterranean-climate conditions are present in two portions of Australia: southwestern Western Australia, and South Australia around Adelaide. The core Southwestern Floristic Province of Western Australia is about 302 km x 103 km in size, similar to the California Floristic Province. A region that experiences two rainy seasons is often included as well, and almost doubles the core MTE area. While mean annual rainfall commonly ranges from 350 to 800 mm over much of southwestern Australia, it reaches as high as 1500 mm at the extreme southwestern corner of Western Australia and drops to about 250 mm at the eastern edge of the Mediterranean-climate region, where it transitions to arid communities.
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