European Centre for Medium-Range Weather Forecasts / Copernicus Climate Change Service
ERA5 global reanalysis
The reference global atmospheric reanalysis: hourly estimates of precipitation, temperature, evaporation, potential evaporation, soil moisture, snow depth and runoff on a roughly 31 km grid from 1940 to the present. Because it is physically consistent and globally complete, ERA5 is the standard basis for cross-country hydrological comparison.
Rights
- Licence
- Copernicus licence
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- YesContains modified Copernicus service information.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- European Centre for Medium-Range Weather Forecasts / Copernicus Climate Change Service
- Geographic coverage
- Global
- Temporal coverage
- 1940 onwards
- Resolution
- 0.25° (~31 km) grid, hourly
- Update frequency
- daily
- Formats
- netcdf, grib, api
- Bulk download
- Available
- Registration required
- Yes
- Rate limit
- Queued request system; concurrent request limits per account
- Cost to Hydrionis
- Free
- Domains
- precipitation, temperature, evaporation, drought, snow ice
Notes
Reanalysis output is modelled, not measured. It assimilates observations but fills gaps with a physical model, so Hydrionis stores ERA5-derived values with basis "modelled" and never presents them as gauge measurements.