Did you know that you can have heatwaves in winter as well as summer? And that fruit bats in Australia literally drop out of trees in the worst of the summer heatwaves? No matter where you live in the world there are four main drivers of heatwaves.
The link between El Niño and heatwaves is complicated. But what we can say is this summer's strong El Niño conditions are likely to bring more heatwaves to much of Australia's north and east, writes Sarah Perkins.