Article: The Atlantic Ocean has less influence on the climate of the Piedmont region, which has hotter summers and colder winters than in the coast. Daytime highs in the Piedmont often reach over 90 F (32 C) in the summer. While it is not common for the temperature to reach over 100 F (38 C) in the state, such temperatures, when they occur, typically are found only in the lower-elevation areas of the Piedmont and far-inland areas of the coastal plain. The weaker influence of the Atlantic Ocean also means that temperatures in the Piedmont often fluctuate more widely than in the coast.

Question: What type of influence of the Atlantic Ocean makes the temperatures fluctuate more than on the coast?
weaker