Why are summers along Newfoundland’s coast often cool?

Summers along the coast of Newfoundland are often cool primarily due to the influence of the Labrador Current.

As midlatitude storms move across Canada and toward the Atlantic seaboard, prevailing northeasterly and easterly winds blow across the cold waters of this current before reaching the coast. This movement of air over the cold current keeps coastal temperatures cool during the summer months and also contributes to delaying the arrival of spring.1