Redmond, WA: Climate Zone, Risk and Window Requirements
Local risk and climate data for Redmond, WA 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 · Washington State Department of Labor & Industries
4CIECC climate zone · ENERGY STAR Northern zone
What zone 4C means for a Redmond window
King County's normal precipitation runs about 37.8 inches a year, with 3.8 inches of snow, which is a separate question from energy performance but still shapes which window details matter in Redmond.
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Redmond 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 6.5 mi away.
Storm and weather risk around Redmond
FEMA scores King County's winter-weather risk as Relatively High and its flood risk as Very High.
Winter risk in Redmond weighs on U-factor and condensation resistance; flood risk weighs more on sill height and drainage detailing than on the glass package.
Treat these as two separate conversations with a Redmond contractor, not one.
- Strong wind
- Very Low
- Winter weather
- Relatively High
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Redmond 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 Redmond
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Rick's Window Rangers INCVerify license
- Glasscadia LLCVerify license
- Clever Glass LLCVerify license