For so long we were told to stay out of the sun because of the risk of skin cancer. However, that is how we get most of our vitamin D, a vital ingredient in many important physiological processes in our body.
In the Pacific Northwest this is especially true. We just had an incredible dry summer and I think everyone here can agree how much that makes a difference.
Another great article from Jerome Burne, medical journalist about this very thing: http://jeromeburne.com/2013/11/22/vampire-get-ill-in-the-sun-we-dont/