Petaluma, CA: Climate Zone, Risk and Window Requirements
Local risk and climate data for Petaluma, 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
3CIECC climate zone · ENERGY STAR South-Central zone
What zone 3C means for a Petaluma window
Santa Rosa-Petaluma, CA runs a January average near 48°F and climbs to about 67°F by July, a swing that adds up to roughly 2,853 heating degree days most winters, with 317 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Petaluma, separate from anything a brochure claims.
Zone 3C's requirement is the floor; Petaluma'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 1.6 mi away.
Storm and weather risk around Petaluma
Sonoma County's hail risk sits at Very Low and its wildfire risk at Relatively High, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Petaluma; 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 Petaluma 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 Petaluma 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 Petaluma
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Save Energy COVerify license
- The Glass Shop Of The North BayVerify license
- Redwood Glass CompanyVerify license
- Golden State Lumber INCVerify license
- Advanced Building Solutions INCVerify license
- All Window & DoorVerify license
- Adam's Glass And RepairVerify license
- Maginn Windows & GlassVerify license
- Dassow Glass CompanyVerify license
- Folio Glass INCVerify license
- MJ Shower DoorsVerify license