EVERYDAY SCIENCE

Detailed explanation-1: -Mainly because the Pacific Ocean keeps it warmer. Also, the jet stream or prevailing winds are usually further north when above Washington state.

Detailed explanation-2: -For example, because the ocean releases heat more slowly than land, coastal areas tend to be more temperate. Upwelling in many coastal regions, such as California, provides a cool contrast in air temperature over the ocean and land that is conducive to frequent summer fog.

Detailed explanation-3: -And the reasons are clear: the West Coast has the relatively mild Pacific to its west, which keeps us warm in winter and cool in summer. The East Coast has a large continental area to its west (weather generally comes from the west in the midlatitudes as you know), which is cold in winter and warm in the summer.

Detailed explanation-4: -4. Distance from the sea – Oceans heat up and cool down much more slowly than land. This means that coastal locations tend to be cooler in summer and warmer in winter than places inland at the same latitude and altitude.