White/silver wheels make way more sense for winter; salt is white-ish, hide the salt.
People only think of black being "for winter" because of the historic use of cheapo steel wheels on cars that come with factory alloys. The steelies are always black because they are normally hidden by plastic snap-on hubcaps on the lower-end models of the car.
Black is for summer when you are autox/hpde'ing and coating them with brake dust, black hides the dust.
