Janesville's Climate Data and Its Top-Rated Window Pros
Local risk and climate data for Janesville, WI sit below, translated into plain terms for a window buyer rather than left as raw codes. 10 installers follow that data instead of a license roster, their rank built from Google's star rating and how many people left one. Checked October 2026.
Google Maps ratings checked · How we rank
5AIECC climate zone · ENERGY STAR Northern zone
What zone 5A means for a Janesville window
Rock County's normal precipitation runs about 37.4 inches a year, with 36.6 inches of snow, which is a separate question from energy performance but still shapes which window details matter in Janesville.
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Janesville 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 4.2 mi away.
Storm and weather risk around Janesville
Rock County's hail risk sits at Relatively High and its wildfire risk at Very Low, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Janesville; 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 Janesville installer before you settle on a product line.
- Hurricane
- Very Low
- Strong wind
- Relatively High
- Winter weather
- Relatively Moderate
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Janesville 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 Janesville, WI
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.
- Wilco ExteriorsGoogle reviews
- Renewal by Andersen of JanesvilleGoogle reviews
- ABC Seamless of Janesville IncGoogle reviews
- Elite Auto Glass - JanesvilleGoogle reviews
- H & H Exteriors IncGoogle reviews
- City Glass Company, Inc.Google reviews
- Infinity ExteriorsGoogle reviews
- Rock River Roofing & ExteriorsGoogle reviews
- Bob’s Custom Windows & Siding, Inc.Google reviews
- Budget home improvementGoogle reviews