The Atlantic tide varies between 1.5 and 2 meters (4 to 6 feet). The ocean temperature ranges between 10 and 15 degrees Celsius (50 to 60 degrees Fahrenheit) in the summer and falls to between 0.5 and 4.5 degrees Celsius (33 to 40 degrees Fahrenheit) in the winter. The ocean moderates temperatures on land year round.
The shape of the ocean floor and the numerous ocean currents facilitates a rich diversity of marine life along the Atlantic coastline. The Labrador Current flowing south from the Arctic cools the ocean during the summer months. Offshore, the Gulf Stream, travelling northwest from the Caribbean to the northern Europe warms the ocean waters. The confluence of currents off Nova Scotia brings unusual Arctic and tropical species to St. Margarets Bay. Marine life includes: