Climate Risk - California

About

Know the climate risks before you buy.

Climate Risk - California displays free, educational climate hazard data for any California property listing — right in a Chrome side panel that sits alongside the page without modifying it.

Works on:
• Zillow • Redfin • Realtor.com • Trulia • Compass • and more

Current Conditions
• Wildfire — CAL FIRE Fire Hazard Severity Zones (State and Local Responsibility Areas)
• Flood — FEMA National Flood Hazard Layer (live API), current flood zone designation

Mid-Century Projections (2050s, RCP 8.5)
• Wildfire Probability — decadal fire occurrence probability from Cal-Adapt / UC Merced
• Projected Flood — FEMA Future Conditions (FC-FIRM), where mapped
• Extreme Heat — projected average maximum summer temperatures
• Extreme Heat Days — projected days above 95°F per year (from actual Cal-Adapt daily data)
• Extreme Precipitation — projected annual rainfall in inches
• Sea Level Rise — coastal vulnerability for applicable properties

The side panel shows an aggregate risk badge for each section and a headline "Now → 2050" summary so you can see at a glance how risk is expected to change.

How it works
Navigate to any California property listing. When the extension icon shows a badge (!), click it to open the side panel. Results load in 10–30 seconds from public government APIs.

Data Sources
CAL FIRE · FEMA NFHL · Cal-Adapt (UC Berkeley / UC Merced) · NOAA · OpenStreetMap Nominatim

Privacy
No data collection. No tracking. No accounts required. Only geographic coordinates are sent to public government APIs. Results are cached locally on your device for 30 days.

Open source: github.com/nmatouka/climate-risk-plugin

Free & open source — MIT License

⚠️ For educational purposes only. Not a substitute for professional real estate or insurance advice. Consult qualified professionals before purchasing property.

v1.5.0: 8 risk indicators now grouped into Current Conditions and Mid-Century Projections. Added Wildfire Probability and FC-FIRM Projected Flood. Switched to live FEMA NFHL API (no more local data file). Fixed Extreme Heat Days to use actual Cal-Adapt daily data at 95°F threshold. Fixed Extreme Precipitation unit conversion.