Fairfax, VA: Climate Zone, Risk and Window Requirements
ENERGY STAR groups Fairfax city into its North-Central zone, which is the U-factor and SHGC target worth checking against any quote you get in Fairfax. The longest-licensed window contractors based in Fairfax are listed below the climate data.
Licenses checked · Virginia Department of Professional and Occupational Regulation, Board for Contractors
4AIECC climate zone · ENERGY STAR North-Central zone
Fairfax's climate zone, in plain terms
Fairfax city's normal precipitation runs about 43.6 inches a year, with 18.5 inches of snow, which is a separate question from energy performance but still shapes which window details matter in Fairfax.
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Fairfax 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 2.7 mi away.
What FEMA's risk data says about Fairfax
FEMA rates Fairfax city's hurricane risk as Relatively Low and its wind risk as Relatively Low.
Neither rating changes a window's energy label, but both are exactly what impact-resistance and design-pressure ratings are built to answer for a Fairfax home.
Ask specifically about design pressure and impact rating for Fairfax, not just energy performance, if either risk rating comes back on the high side.
- Hurricane
- Relatively Low
- Strong wind
- Relatively Low
- 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 Fairfax 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.
Fairfax's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- American Window & Siding Of Virginia INCVerify license
- D S Windows INCVerify license
- Argo Glass & Windows Va INCVerify license
- Premium Window Solutions LLCVerify license