I guess there are just some people who like to be outside to experience extreme conditions firsthand.
I remember one day a few years ago when I had to go to work during one of the strongest blizzards in Massachusetts in a long time. I had to open the store, and I walk, so I left early, and that was probably the hardest walk of my life. The number of customers who somehow managed to drive to the store in barely-plowed streets and whiteout conditions (!) was staggering. None of our staff wanted to come, though, so we opened five hours late. But we apparently would have done quite a lot of business had we opened on time, because nothing was stopping our customers from coming in the anticipation of shopping!