I grew up in a northern state and used to pride myself as a teen that I could wear a t shirt in the snow or be wearing a hoodie at the busstop while others had winter coats.
After a some years in Southern Florida a slight breeze bringing it to 70 degrees gets me into a sweater lol
The body really acclimates. It used to be so hot the first summer and nowadays it’s not a big deal. But actually this summer has been unusually hot, however that seems a bit anomalous.