Everyone reacted differently to the sun; and a lot of our meds say to stay out of the sun. did you know that the northern hemisphere is closer to the sun in the winter? funny isn't it? Try it and see how you react. Do you get the rashes badly in the summer then you need the sunscreen on the winter also. My only other bit of advice is a hot shower or bath when you come in to ward off the chill.
Oh and where in Pennsylvania are you? My family comes from Millersville.