East Coast US vs. West UK Temperatures: The Premise Is Wrong—US East Coast Is Warmer

The question contains a false premise. The U.S. East Coast is generally warmer than the U.K. West Coast at comparable latitudes.

Latitude Comparison

• New York City (40.7°N): Jan avg 0°C (32°F), Jul avg 25°C (77°F)
• London (51.5°N): Jan avg 5°C (41°F), Jul avg 18°C (64°F)
• Boston (42.4°N): Jan avg -2°C (28°F), Jul avg 23°C (73°F)
• Glasgow (55.9°N): Jan avg 4°C (39°F), Jul avg 15°C (59°F)

Why the UK Is Milder in Winter

The Gulf Stream / North Atlantic Current brings warm subtropical water to UK shores, raising winter temperatures far above latitude expectations. The U.S. East Coast gets cold continental air masses from Canada—no oceanic buffer.

Why the US East Coast Is Hotter in Summer

Continental heating: land warms fast and deep. The UK's maritime climate keeps summers cool—ocean absorbs heat, onshore winds advect cool air.

Apples-to-Apples

Compare similar latitudes: Newfoundland (47°N) vs. France (47°N). St. John's Jan avg -4°C; Brest Jan avg 7°C. The Gulf Stream warms Europe, not North America's east coast.

The temperature contrast is real—the question just reversed it.