When It's Cold, People Bundle Up.
Unless you're one of those polar bear plunge people who enjoys jumping into icy water wearing nothing but an elegantly-fitted Speedo, you probably pull your coat out of the closet the first cold day of winter and leave it on until spring.
Well, you're not alone. We know this thanks to a study on adaptive thermal comfort, which plotted out the relationship between temperatures and the thermal resistance of people's clothes [source: van der Linden]. Basically, when the temperature gets colder, people dress more warmly. A further stunning revelation is this: People are most swayed by the outdoor temperature at around 6:00 a.m. [source: De Carli].
So, there you have it. There's proof behind that wintertime whine, "It's cold out. I don't want to get up!" and that search for a warm sweater when you're feeling chilly.