Why does the fremantle doctor occur?

The Fremantle Doctor is a cooling sea breeze that occurs in Perth, Australia, typically during the hot summer months. It arises due to the temperature difference between the hot inland areas and the cooler Indian ocean. As the land heats up during the day, air rises, creating a low-pressure zone that draws in cooler air from the ocean, resulting in a refreshing breeze. This phenomenon helps to moderate temperatures and provides relief from the heat.