The West Coast of the United States is generally colder than other regions at the same latitude due to a few key factors. One of the main reasons is the influence of the cold California Current, which flows southward along the coast from the Gulf of Alaska. This current cools the air and water temperatures along the coast, leading to cooler temperatures overall.
Additionally, the West Coast is also affected by the Pacific Ocean's large size and depth, which creates a more stable and cooler climate. This is because the ocean absorbs and retains heat more effectively than land, which can lead to cooler temperatures along the coast.
Another factor is the presence of coastal mountains, which can block warmer air from moving inland and can create a "marine layer" of cool, moist air along the coast. This layer can keep temperatures lower even on sunny days.
Finally, the West Coast also experiences more frequent and intense weather patterns, including storms and heavy rainfall, which can further contribute to the cooler climate.