Where are dry-summer tropical climates found in the united states?

The correct answer is:

California.

California´s climate varies from hot desert to polar, according to latitude, elevation, and closeness to the coast. California's coastal areas have a Mediterranean climate, with warmer, drier weather in summer and cooler, humid weather in winter. Low-lying interior valleys, such as the Central Valley, have hot-summer Mediterranean weather, with subtropical temperatures but a clear summer dry season.

permafrost layer, it exists beneath a layer of soil, rock or sediment.