Climate Risk — California

Free browser extension that displays climate risk information for California properties on Zillow, Redfin, Realtor.com, Trulia, Compass, and Homes.com

⬇️ Download for Chrome
Version 1.5.0 • Free & Open Source
Climate Risk Extension Screenshot

Climate risk data displayed in a Chrome side panel alongside supported real estate websites

Climate Risk Data

Current Conditions

🔥

Wildfire Risk

Official CAL FIRE Fire Hazard Severity Zones (both State and Local Responsibility Areas) showing property-level wildfire exposure

Minimal Moderate High Very High
🌊

Flood Risk

FEMA National Flood Hazard Layer (live API), returning the current flood zone designation for any California address

Zone X Zone AE Zone VE

Mid-Century Projections (2050s, RCP 8.5)

🔥

Wildfire Probability

Decadal wildfire occurrence probability from Cal-Adapt / UC Merced climate models for the 2050s decade

<3% 10–25% 25%+
🌊

Projected Flood (FC-FIRM)

FEMA Future Conditions flood hazard extracted from the same NFHL response, showing where flood risk is expected to increase

☀️

Extreme Heat

Cal-Adapt projections of mid-century average maximum temperatures under the RCP 8.5 emissions scenario

85°F avg 95–105°F 110°F+ avg
🔆

Extreme Heat Days

Projected days above 95°F per year by mid-century, counted directly from Cal-Adapt daily climate data

<10 days/yr 30–60 days/yr 90+ days/yr
🌧️

Extreme Precipitation

Projected average annual rainfall by mid-century from Cal-Adapt, classified from Minimal to Severe

<10 in/yr 20–35 in/yr 50+ in/yr
📈

Sea Level Rise

Coastal vulnerability assessment with links to the NOAA Sea Level Rise Viewer and California Coastal Commission for coastal properties

Authoritative Data Sources

CAL FIRE

Fire Hazard Severity Zones

FEMA NFHL

National Flood Hazard Layer

Cal-Adapt / UC Merced

Heat, Precipitation & Wildfire Probability Projections (2050s)

NOAA

Sea Level Rise Viewer

CA Coastal Commission

Sea Level Rise Guidance

Installation

1

Download the extension

Search for Climate Risk - California in the Chrome Web Store, or download from GitHub to load unpacked

2

Pin the extension

Click the 🧩 puzzle piece icon in Chrome's toolbar, find Climate Risk, and click 📌 to pin it so the badge indicator is always visible

3

Browse property listings

Navigate to any California property on Zillow, Redfin, Realtor.com, Trulia, Compass, or Homes.com. The extension icon shows a badge (!) when you're on a supported property page — click it to open the Climate Risk side panel showing 8 risk indicators grouped into Current Conditions and Mid-Century Projections

Disclaimer

This information is provided for educational purposes only and should not be the sole basis for real estate decisions. Climate risk assessments may not reflect the most current conditions or all potential hazards. Consult with qualified professionals and review official hazard maps before purchasing property.

Privacy First

Your privacy is important. This extension operates entirely on your device.

No data collection
No tracking
Open source
Local caching only
Does not modify real estate websites