When I was in Vietnam in December a couple of years back, I was comfortable wearing a tshirt and shorts, it was about 25 degrees in Hanoi from memory. I had se

When I was in Vietnam in December a couple of years back, I was comfortable wearing a tshirt and shorts, it was about 25 degrees in Hanoi from memory. I had several Vietnamese people ask me how I wasn't feeling cold, several of them were wearing jerseys to stay warm. I told them there where I'm from, it gets down to -6 in winter, 25 degrees is warm to me. It's really the humidity in Asia that gets me though. It got up to 40 C in my (new) city this summer and I didn't really struggle at all, because it was dry heat.