Will ocean currents change the climate?

The winter in Bordeaux, France is much warmer than that in Montreal, Canada at the same latitude and altitude. One reason is the reconciliation of the Gulf Stream, a fast-moving North Atlantic ocean current that heats the coastal atmosphere. The Gulf of Mexico, which originated in the Caribbean, moved northward to Newfoundland, where it met the colder Labrador current, and then separated and flowed across the Atlantic Ocean to Europe as the North Atlantic current.

Montreal is surrounded by land, and it is easier for Montreal to reach extreme temperatures than Halifax, which is a coastal city with almost the same latitude and adjacent to the ocean. The ocean brings more rainfall (because the air is warmer) and storms, which is due to the constant collision between polar air masses and air masses heated by ocean currents.