Ocean currents : The warm North Atlantic Drift helps to keep parts of western Europe warm. The ports here are open for trade even in winter.
Winds : The South-Westerlies that blow across the North Atlantic Ocean towards Europe are warmed as they pass over the North Atlantic Drift. These warm winds from sea to land pick up moisture and cause rainfall, which decreases eastwards. They also help to raise the winter temperatures of coastal and central European countries.
