Window Climate Specs for San Francisco, CA

Local risk and climate data for San Francisco, 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 September 30, 2026 · California Contractors State License Board

3CIECC climate zone · ENERGY STAR South-Central zone

What zone 3C means for a San Francisco window

San Francisco County's normal precipitation runs about 36.2 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 San Francisco.

Moisture and glass performance are handled by different parts of a window's spec sheet, and a San Francisco 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 27.9 mi away.

Storm and weather risk around San Francisco

San Francisco County's hail risk sits at Very Low and its wildfire risk at Very Low, according to FEMA's National Risk Index.

Hail risk matters for glass and screen durability in San Francisco; 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 Francisco installer before you settle on a product line.

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 San Francisco 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 Francisco

Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.

Golden Gate Glass & Mirror CO INCWindow and glass contractor · licensed 62 years · 94110Verify license
Progress Glass CO INCWindow and glass contractor · licensed 56 years · 94124Verify license
Tony's Windows And Glass INCWindow and glass contractor · licensed 48 years · 94110Verify license
Sunset Glass INCWindow and glass contractor · licensed 43 years · 94122Verify license
Theisen Glass Company INCWindow and glass contractor · licensed 43 years · 94103Verify license
California Thermal WindowsWindow and glass contractor · licensed 42 years · 94116Verify license
Collier Building Specialties INCWindow and glass contractor · licensed 40 years · 94124Verify license
Collier Warehouse INCWindow and glass contractor · licensed 40 years · 94124Verify license
Aspen Contractors INCWindow and glass contractor · licensed 40 years · 94121Verify license
K C Glass INCWindow and glass contractor · licensed 38 years · 94124Verify license
Celtic Glass INCWindow and glass contractor · licensed 37 years · 94134Verify license
Golden State GlassWindow and glass contractor · licensed 35 years · 94118Verify license

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