In hot places with widespread air conditioning there is also usually a summer peak (people go indoors and close windows, just as they do in cooler places in winter). SA has had peaks in both winter and summer.
Oh good point. I know that is the case for the US South and I find it somewhat silly that media in the US always blames southern surges on anti-mask and anti-lockdown sentiments but the winter surge in the North is new variants etc. without all the victim blaming.