[Mogger]

It's late fall down there, approaching winter.

Less sun = less UV to kill the virus.

[Antoninus]

Less sun = less UV to kill the virus.

Also, more people Vitamin D deficient....

[Myrddin]

Less sun = less UV to kill the virus.

Less sun means lower vitamin D levels. That is the cause of severe cases of COVID-19. It is passed person to person via droplets...mostly indoors where sunlight has no impact.