Very little but it does happen. Even in the " low country". I grew up in Charleston and saw a max of an inch or two at a time. Yet it does just about shut down everything because most do not know how to drive in it.
In South Carolina, snow can fall between November and March but has fallen as late as May in mountainous northwestern counties. Most South Carolina snowstorms are formed when a cold, dry polar air mass heads south and a mass of warm moist air from the tropics moves north. When the two air masses collide, a cyclone or low-pressure center can develop over the ocean.