An extreme heatwave is a period of successive days (three days in SA) when the temperature is considerably hotter than the concluding month and a 30-year average. Extreme heatwaves in Adelaide usually last up to three days. In the summer 2014 Adelaide experienced 13 days over 40°C. This fact sheet outlines the key things to do to stay safe in a heatwave, using South Australia as the example.
stay safe in heatwaves final (417476 PDF)