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Scientists are warning that a second wave of the coronavirus could hit in winter when temperatures drop, more than likely forcing another round of lockdowns to keep the infection from spreading.

A senior member of Britain’s Scientific Advisory Group for Emergencies told The Sun newspaper that COVID-19 flourishes in colder temperatures and could spread rapidly when the mercury dips to 39 degrees.

“It is really important that people get ready for the challenges that winter will undoubtedly bring,” said an unnamed senior official with the group.

Scientists are monitoring spikes in the spread of the coronavirus in Melbourne, Australia’s second-largest city. As the country heads into the Southern Hemisphere’s winter, authorities ordered a second six-week lockdown last week after the confirmation of 75 new cases.