A 'severe heatwave' was declared for large parts of Tasmania as temperatures reached the high 20s, and overnight lows were in the high teens. It's raised the question of why a mild summer's day in one part of Australia is a heatwave in another — and if everyone experiences heat the same way. Like much of Australia, studies show that Tasmanian suburbs lack resilience to heatwaves, and there are calls to improve urban design and rental standards.