Elevation above sea level is most responsible for temperature change across the state, with the mountain area being coolest year-round. The climate is also influenced by the Atlantic Ocean and the Gulf Stream, especially in the coastal plain. These influences tend to cause warmer winter temperatures along the coast, where temperatures only occasionally drop below the freezing point at night. The coastal plain averages around of snow or ice annually, and in many years, there may be no snow or ice at all.