That's not in evidence. The vast majority of cases in Australia were people who contracted it abroad, or from a close contact who contracted it abroad. There'

That's not in evidence. The vast majority of cases in Australia were people who contracted it abroad, or from a close contact who contracted it abroad. There's been relatively little community spread in Australia, even as we've progressed into the cooler autumn months. We've been in lockdown since mid March, but given that we now know the virus was quite prevalent in China even in December, and Australia only restricted travel from China in late January, it would have spread much more rapidly if it was going to. Other examples are Thailand and India, which have both had relatively little spread. Brazil may be a counter-example; it has had had a fairly severe outbreak even with fairly warm weather. So, I don't believe warm weather wipes out the virus altogether, but it does seem to significantly reduce spread. I wrote more about this last week here: https://news.ycombinator.com/item?id=23005189 https://news.ycombinator.com/item?id=23005189