Britannica Sources used in this answer

Why are winters in Bergen, Norway, milder than winters in Halifax, Nova Scotia?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Map of the North Atlantic Ocean showing major ocean currents, with warm currents like the Gulf Stream and North Atlantic Drift highlighted in pink and cold currents in blue. Arrows indicate current directions and relative speeds, connecting the eastern coasts of North America, the western coasts of Europe and Africa, and the Arctic region. — Gulf Stream Major warm and cold currents of the North Atlantic Ocean.

Winters in Bergen, Norway, are significantly milder than those in Halifax, Nova Scotia, primarily due to the influence of the North Atlantic Current, an extension of the Gulf Stream system.12

This system transports warm, saline water from the tropics toward the high latitudes of the North Atlantic. In northwestern Europe, this warm current, combined with prevailing westerly winds, moderates the climate, preventing the extreme cold that would otherwise be expected at such high latitudes. This heat transfer is a key component of the thermohaline circulation, which effectively warms the region.123

In contrast, the climate of the North American Atlantic coast, including Halifax, is heavily influenced by cold air masses originating from the continent. The region experiences frequent intrusions of cold air from Canada, and the chilling effects of the Greenland ice cap and the Labrador Current contribute to colder winter conditions. While the Gulf Stream does provide some warmth to the western North Atlantic, the prevailing wind patterns and continental geography often result in much colder temperatures for North American coastal cities compared to their European counterparts.345