I've always been someone that HATED the heat. I'd rather it be 20 degrees than for it to be 75 and up! That said, in my area humidity is a big factor, now it isn't always 100%, but it doesn't have to be. There is days that I've started working outside at 8 in the morning, where it is around 80 degrees, but the humidity is so high that it could be 125. Sweat until I look like I jumped in a pool, severe headaches, etc. When it is cold, if I get cold I can always put more clothes on (which I've worked outside in 20 degree weather without anything except a T-shirt and jeans on, so I like it cold), however, in the summer, there is nothing that I can do to get away from the heat, so that is why I hate heat so much.
Though, I'm glad that we do have a sun, without it we'd be gone.