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Climate & Weather Data

ERA5 Reanalysis (Copernicus Climate Store)

ERA5 is ECMWF's global reanalysis dataset providing hourly atmospheric and surface climate variables from 1940 to present at ~31km resolution, accessible via the Copernicus Climate Data Store.

Format GRIB / NetCDF
Coverage Global
Resolution ~31km (0.25°)
License Free open access (Copernicus License)
Update Continuous (delayed by ~5 days)
Download source Open official source

Format

GRIB / NetCDF

Geometry

Raster (reanalysis grid)

Coverage

Global

Resolution

~31km (0.25°)

About this dataset

Global reanalysis dataset from ECMWF providing hourly climate variables from 1940 to present at ~31km resolution.

ERA5 is the fifth-generation ECMWF reanalysis providing hourly estimates of atmospheric, land-surface, and ocean-wave climate variables globally from 1940 to present. It combines model data with observations using data assimilation to produce a consistent gridded climate record at approximately 31km resolution.

Climate reanalysis Historical weather reconstruction Renewable energy assessment

How to download

  1. 1 Register for a free Copernicus Data Space account.
  2. 2 Navigate to the ERA5 single-levels or pressure-levels dataset.
  3. 3 Define your area, time period, and variables using the web form or CDS API.
  4. 4 Download the GRIB or NetCDF data and process with xarray, QGIS, or other tools.

Copernicus Climate Data Store

Primary access via CDS API or web interface

→

ERA5 documentation

Technical documentation and data format guide

→

FAQ

What is climate reanalysis?

Climate reanalysis combines observations (satellite, weather stations, ships, etc.) with a numerical weather model using data assimilation to produce a consistent, gridded record of past weather and climate.

Can I access ERA5 programmatically?

Yes. The Copernicus Climate Data Store provides a Python API (cdsapi) for programmatic access to ERA5 data. Install with 'pip install cdsapi' and configure your API key from your CDS account.