How does the climate of South Australia’s southern coast differ from that of its arid interior?

The climate of South Australia varies significantly between its southern coastal zone and its arid interior, primarily due to differences in rainfall and temperature stability.1

Coastal vs. Interior Climates

• Southern Coastal Zone: This region experiences a "Mediterranean" climate, characterized by mild to cool, wet winters and hot, dry summers. Maritime influences, drawn inland by Spencer Gulf and Gulf St. Vincent, help moderate the environment. In these settled areas, the annual number of "hot" days (exceeding 86 °F/30 °C) typically ranges from 10 to 50.1
• Arid Interior: In contrast, the interior is defined by highly erratic rainfall. The northern two-thirds of the state face much harsher conditions, experiencing more than 110 "hot" days per year.1

The state’s weather is largely dictated by the interplay between the Southern Ocean and the continental interior. This interaction can cause sharp temperature fluctuations, particularly in summer, when intense northerly winds may be rapidly replaced by cooler air from the ocean. While the coast receives higher annual precipitation, the interior remains the driest part of the state, with some areas near Lake Eyre receiving 6 inches (150 mm) or less of rain annually.1