Major Climate Classifications (Köppen System in the U.S.) The U.S. spans six of the world’s major climate types:

Climate Type

Regions in the U.S.

Tropical (A)

Southern Florida, Hawaii, U.S.

territories (Puerto Rico, Guam)

Dry (B)

Southwest deserts (Arizona,

Nevada, New Mexico, parts of

California & Texas)

Temperate / Humid

Southeast and Gulf Coast

Subtropical (Cfa/Cwa)

(Texas to Virginia, including

Atlanta, Nashville)

Humid Continental (Dfa/Dfb)

Midwest, Great Lakes,

Northeast, interior Northeast

(e.g., Chicago, Minneapolis,

Boston)

Subarctic / Polar (Dfc, ET)

Alaska (interior and northern

regions)

Mediterranean (Csa/Csb)

Coastal California (e.g., Los

Angeles, San Francisco)