Kevin,
I don't know how bad your scalp is, if it's not too bad you can try a shamppo called T-SAL. It's for problem dryskin/dandruff. I think you'll also find that it isn't the sun that makes your skin better, it's the heat and humidity during summer months. The cold dry air of winter, especially where you are from, is what makes our skin worse in winter time. By the way, the sun provides you with vitamin D. Hope this helps.
Keith.