Climate Zone 12: Sacramento & Northern San Joaquin
Hot, dry summers with Delta breezes and cool, foggy winters.
Every Title 24 energy calculation uses the climate zone of the building’s physical location. In Zone 12, the climate is mixed, which shapes which building features have the most effect on compliance.
Typical project considerations
- Cooling and heating both significant.
- High new-construction volume in suburban areas.
General guidance only — requirements depend on building type, scope and the code edition in effect for your permit application.
Example communities
Sacramento · Stockton · Modesto
City guides: Sacramento · Stockton · Modesto
Official references
Frequently asked questions
Where is California Climate Zone 12?
Climate Zone 12 (Sacramento & Northern San Joaquin) covers areas such as Sacramento region, Stockton, Modesto. Its representative weather city in CEC data is Sacramento. Boundaries don’t follow city limits, so confirm by address.
Does Climate Zone 12 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.
Ready to get your Title 24 report?
Upload your plans in minutes. We’ll handle the modeling, the forms and the plan-check revisions.