The California Energy Commission’s Climate Zone Map is available on their website, here, and also below:
The Climate Zone Map, and its implications on the cost-effectiveness of implementation, must be reviewed if a local government wishes to adopt local standards for energy efficiency beyond those set by Title 24 and have those standards approved and made enforceable by the CEC.
Already completed cost-effectiveness studies may be available for your climate zone. Search the CEC’s website or contact the Coordinator for more information.