Climate Zone 13: Central San Joaquin Valley
Long, very hot summers and cool winters.
Every Title 24 energy calculation uses the climate zone of the building’s physical location. In Zone 13, the climate is cooling-dominated, which shapes which building features have the most effect on compliance.
Typical project considerations
- Cooling dominates; glazing, shading and attic design are key.
- Duct leakage and location have outsized impact.
General guidance only — requirements depend on building type, scope and the code edition in effect for your permit application.
Example communities
Fresno · Bakersfield · Visalia
City guides: Fresno · Bakersfield
Official references
Frequently asked questions
Where is California Climate Zone 13?
Climate Zone 13 (Central San Joaquin Valley) covers areas such as Fresno, Bakersfield, Visalia. Its representative weather city in CEC data is Fresno. Boundaries don’t follow city limits, so confirm by address.
Does Climate Zone 13 change my Title 24 requirements?
Yes. All Energy Code calculations use the project’s climate zone, which affects prescriptive values such as insulation and window performance and how heating and cooling are weighted in performance modeling.
What report do I need?
Single-family projects use CF1R, low-rise multifamily uses LMCC and nonresidential projects use NRCC forms — regardless of climate zone.
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