Why Norway and Iceland's Harbors Stay Ice-Free in Winter

The North Atlantic Current

The North Atlantic Current (extension of the Gulf Stream) transports warm, saline water from the Gulf of Mexico northeast across the Atlantic.

Mechanism

1. Gulf Stream flows north along US/Canada coast.
2. Splits near Grand Banks: one branch → North Atlantic Current.
3. Current passes west of Ireland/UK, splits again:
4. → Norwegian Current → flows along Norway's coast → into Barents Sea/Arctic.
5. → Irminger Current → wraps around Iceland's south/west coast.

Result

• Water temperatures: 6–10°C (43–50°F) off Norway/Iceland in winter.
• Air temperatures moderated: Bergen (60°N) avg Jan high 4°C (39°F); Reykjavik (64°N) avg Jan high 2°C (36°F).
• Harbors (Bergen, Trondheim, Narvik, Reykjavik, Akureyri) remain open year-round without icebreakers.

Contrast

At similar latitudes: Labrador (Canada) frozen; Greenland coast frozen; Murmansk (Russia) needs icebreakers. The current is the decisive difference.