You adapt to the climate you are in.
I grew up here in the Boston area until age 16. I remember the winters as colder and snowier than what I live with now. I always played outside, went swimming in freezing water when it was 60 degrees and generally disliked heat. We only had 2 bedroom AC units. We also spent almost the whole summer at the beach.
Moved to Florida (Miami) where no one went outside for most of the year and it was so humid, you had to leave your closet doors open, even with central AC, so they wouldn't stick. I hated the hot sun, being further south and got a very bad sunburn during my first month there, March. I missed the seasons.
I moved to Phoenix at age 20 or so, where from November to March, it was nice, cool (30s-50s) at night and goes up to about 65-70 in the day. It also rained a bit during these months. However, I was working or in school, and never really got to enjoy the weather. I spent my time in a gym! I liked being able to drive to a 4 season climate, unlike Florida. I hated the summers. From April through October it would be 100-112 degrees and in Phoenix, it does not get below 100 at night from mid May to mid September. I learned to live inside, much worse than anything in a colder climate. When people say "it's a dry heat," yeah, stick your head in the oven at 450 degrees! That's what it feels like. You can dress right for the climate I live in now, (wool), but you cannot be comfortable or be safe exercising outside when it is 110. I had no trouble acclimating back to 4 seasons after 23 years of almost endless summer. I enjoy the constant change and the seasons. I love the fall and I took up a couple of snow sports to be "in" the winter.
Now, I understand that the winters here are not as harsh as what some of you describe. We do get below zero weather, but usually not for more than 3 days at a time. I've done plenty of x country skiing at temps of -5 F. I still don't like exercising outdoors in the heat, but I've improved my tolerance in recent years.