Geocentric Science

Liquid water has one of the highest specific heat capacities. Specific heat capacity is defined as the amount of heat per unit mass needed to raise the temperature of a substance by 1˚C. Therefore, it takes a lot of energy for liquid water to change temperature. Although the northern Atlantic Ocean does heat up slightly during the summer months, the ocean is so large (and deep), that it does not get very warm. In order warm the North Atlantic Ocean, a huge amount of heat is required and several summer months of heating does not do the job.

However, you’ll notice that bodies of water in warmer climate regions are warm year round because that body of water receives a lot of intense insolation throughout the year and therefore remains warm.