Newark, CA: Climate Zone, Risk and Window Requirements
ENERGY STAR groups Alameda County into its South-Central zone, which is the U-factor and SHGC target worth checking against any quote you get in Newark. The longest-licensed window contractors based in Newark are listed below the climate data.
Licenses checked · California Contractors State License Board
3CIECC climate zone · ENERGY STAR South-Central zone
Newark's climate zone, in plain terms
San Francisco-Oakland-Fremont, CA runs a January average near 50°F and climbs to about 67°F by July, a swing that adds up to roughly 2,288 heating degree days most winters, with 430 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Newark, separate from anything a brochure claims.
Zone 3C's requirement is the floor; Newark's specific load is what tells you whether beating that floor is worth the extra cost.
Data: U.S. EPA / DOE, ENERGY STAR, ENERGY STAR Version 7.0 Climate Zones by County/ZIP (Windows, Doors, and Skylights) (V7.0); Pacific Northwest National Laboratory (DOE Building America), Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) (2021 IECC), from the nearest NOAA station 0.7 mi away.
What FEMA's risk data says about Newark
Neither rating changes a window's energy label, but both are exactly what impact-resistance and design-pressure ratings are built to answer for a Newark home.
Ask specifically about design pressure and impact rating for Newark, not just energy performance, if either risk rating comes back on the high side.
- Strong wind
- Very Low
- Winter weather
- Very Low
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Newark window bids come in
- How to Read an NFRC Window Label Four numbers on one sticker decide most of a window's real-world performance. Here's what each one means.
- ENERGY STAR Window Criteria by Climate Zone ENERGY STAR splits the country into four zones, each with its own numbers. Here they are, and why the Northern zone works backward from the other three.
- Impact Windows vs. Shutters in Florida's Hurricane Zones Florida gives homeowners two paths to a protected opening. Here's how each one is tested, and where the HVHZ raises the bar further.
Newark's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Central Glass Industries INCVerify license
- A Christian Glass And MirrorVerify license
- Roxy Glass INCVerify license