Glendale, CA: Climate Zone, Risk and Window Requirements
ENERGY STAR groups Los Angeles County into its South-Central zone, which is the U-factor and SHGC target worth checking against any quote you get in Glendale. The longest-licensed window contractors based in Glendale are listed below the climate data.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
Glendale's climate zone, in plain terms
Los Angeles County's normal precipitation runs about 16.5 inches a year, with 0.0 inches of snow, which is a separate question from energy performance but still shapes which window details matter in Glendale.
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Glendale buyer benefits from checking both instead of assuming one implies the other.
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 5.9 mi away.
What FEMA's risk data says about Glendale
Los Angeles County's hail risk sits at Relatively Moderate and its wildfire risk at Very High, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Glendale; wildfire risk matters more for the frame material and nearby vegetation than for the glass itself.
Either way, it's a reasonable question to bring to a Glendale installer before you settle on a product line.
- Strong wind
- Relatively Moderate
- Winter weather
- Relatively Moderate
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Glendale 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.
Glendale's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Augustine & Bailey INCVerify license
- Rountree Glass COVerify license
- Thrifty Glass & Mirror CO INCVerify license
- Central Screen COVerify license
- Grandview Glass & Mirror Industries INCVerify license
- Cali Glass Doors & WindowsVerify license