San Ysidro, CA: Climate Zone, Risk and Window Requirements
Local risk and climate data for San Ysidro, CA are below, translated into plain terms for a window buyer rather than left as raw codes. Use it to check a proposed spec before you sign, not just to browse.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
What zone 3B means for a San Ysidro window
San Diego-Chula Vista-Carlsbad, CA runs a January average near 57°F and climbs to about 69°F by July, a swing that adds up to roughly 1,482 heating degree days most winters, with 520 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in San Ysidro, separate from anything a brochure claims.
Zone 3B's requirement is the floor; San Ysidro'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 3.9 mi away.
Storm and weather risk around San Ysidro
San Diego 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 San Ysidro; 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 San Ysidro installer before you settle on a product line.
- Hurricane
- Very Low
- Strong wind
- Relatively Moderate
- Winter weather
- Relatively Low
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before San Ysidro 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.
Window installers with the longest license records in San Ysidro
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- SD GlazingVerify license
- Arz Glass INCVerify license
- Trujillo Windows INCVerify license