What percentage of people suffers from raynaud's phenomenon?

About 5% in the U.S. An estimated 5% of people in the United States have symptoms of raynaud's phenomenon. People with raynaud's symptoms can have vasospasm in the blood vessels supplying their fingers and/or toes, triggered by exposure to cold, vibrations, emotional stress, etc...
Few. It is somewhat random. There may be people prone to the problem that do not have the cold exposure!

Related Questions

Raynaud phenomenon syndrome question. Is it really that or poor circulation?

See below. Raynaud's phenomenon describes a set of color changes in response to cold or stress. These are usually preventable and treatable. Poor circulation does not have those changes. Read more...
Color and location. Raynauds causes fingers to turn either white, blue and/or red usually in the cold. Poor circulation is different because it can affect palms and usually the border of the color change is a smooth transition. Raynauds usually has a distinct line between normal and blue /white. Read more...