Weather History & Climate · 1 article

Weather History Guides

Plain-language guides to the data behind WeatherJourney — what a climate record is, how we build averages and trends from 80+ years of ERA5, and how to read them honestly. Every figure traces back to the modelled record since 1940.

Jul 5, 20264 min read
What Is ERA5 Reanalysis, and Why We Use It for Weather History
ERA5 is a modelled, gridded record of the weather since 1940, built by ECMWF for the EU's Copernicus service. What a reanalysis is, how it differs from station readings, and how to read it honestly.

What Is ERA5 Reanalysis, and Why We Use It for Weather History