Why is it warmer in most of europe than in northern california even though both are on the east side of an ocean and europe is at higher latitude than california?

The motivation behind why hotter in the vast majority of Europe than in northern California despite the fact that both are on the east side of a sea and Europe is at higher scope than California is a result of California is influenced by a frosty seaward ebb and flow, while Europe has the warm north Atlantic ebb and flow, the continuation of the Gulf Stream.