What if all cities/towns in California were 10,000 feet above sea level?

I Want to know if all cities/towns in the State of California were 10,000 feet above sea level. Like what would the weather be?

Public Comments

1. only one way to find out. abandon cities and relocate to the mountains.
2. Same weather you might experience on top of a mountain of that height.
3. Cold
4. Higher wind speed, less protection from the sun and one hell of a walk to the beach