Clayton's Climate Data and Its Top-Rated Window Pros
Clayton sits in IECC climate zone 3A, which sets the energy-performance bar here no matter who ends up installing your windows. A window license file doesn't cover Clayton on this site, so Google Maps supplies the 10 ranked names you see below. Checked September 2026.
Google Maps ratings checked · How we rank
3AIECC climate zone · ENERGY STAR South-Central zone
What zone 3A means for a Clayton window
Raleigh-Cary, NC runs a January average near 41°F and climbs to about 79°F by July, a swing that adds up to roughly 3,394 heating degree days most winters, with 1,579 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Clayton, separate from anything a brochure claims.
Zone 3A's requirement is the floor; Clayton'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 1.5 mi away.
Storm and weather risk around Clayton
Johnston County's hail risk sits at Relatively Moderate and its wildfire risk at Very Low, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Clayton; 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 Clayton installer before you settle on a product line.
- Hurricane
- Relatively Moderate
- Strong wind
- Relatively Moderate
- Winter weather
- Very High
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Clayton 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.
10 top-rated window installers near Clayton, NC
The order below weighs a Google rating against its review count, the same way this site weighs a U-factor against a brochure claim: on the number, not the name. Treat it as a rating, never as proof of a license, bond or HVHZ approval.
- Glass SolutionsGoogle reviews
- Mr. Handyman of NE Raleigh to Clayton AreaGoogle reviews
- Renewal by Andersen of Central North Carolina - GarnerGoogle reviews
- Mad City Windows & Baths of RaleighGoogle reviews
- Carolina Roofing & Vinyl Siding, LLCGoogle reviews
- Raleigh Windows and DoorsGoogle reviews
- Wood's Home Maintenance Service Inc.Google reviews
- DML Siding & Windows LLCGoogle reviews
- Hellis Family GlassGoogle reviews
- Olde Town Supply Co.Google reviews