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OneScience-Group/ERA5

ERA5 Dataset Description ERA5 is the fifth-generation global atmospheric reanalysis dataset produced by the European Centre for Medium-Range Weather Forecasts (ECMWF). By combining global observations with physical models, it provides consistent and comprehensive global estimates of hourly, high-resolution (approximately 31 km) climate variables covering the atmosphere, land, and ocean from 1940 to the present. Supported Tasks This standardized data… See the full description on the dataset page: https://huggingface.co/datasets/OneScience-Group/ERA5.

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Dataset Card

ERA5

Dataset Description

ERA5 is the fifth-generation global atmospheric reanalysis dataset produced by the European Centre for Medium-Range Weather Forecasts (ECMWF). By combining global observations with physical models, it provides consistent and comprehensive global estimates of hourly, high-resolution (approximately 31 km) climate variables covering the atmosphere, land, and ocean from 1940 to the present.

Supported Tasks

This standardized data repository provides annual HDF5 files for 1979-2025. Each file contains multivariable atmospheric gridded fields, along with global means and standard deviations aligned with the variable order, and can be used by multiple weather models for training, inference data loading, evaluation, and visualization.

Dataset Format and Structure

Each annual file is in HDF5 format and follows the path pattern data/<year>.h5. Each file contains:

HDF5 Path	shape	dtype	Description
`fields`	`[T, 243, 721, 1440]`	`float32`	Multivariable gridded fields; variable names are stored in `fields.attrs["variables"]`
`global_means`	`[1, 243, 1, 1]`	`float32`	Global means aligned with the variable order
`global_stds`	`[1, 243, 1, 1]`	`float32`	Global standard deviations aligned with the variable order

fields.attrs["time_step"] is 6, indicating 6-hour intervals. The detailed schema is provided in metadata/schema.yaml.

./static/ contains common static variables such as terrain and land-sea masks.

How to Use the Dataset

This dataset is suitable for multiple weather models in the OneScience-Group repository, including but not limited to GraphCast, FengWu, Fuxi, and Pangu_Weather.

Download the dataset:

bash

hf download --dataset OneScience-Group/ERA5  --local-dir ./data

Official OneScience Information

Platform	OneScience Main Repository	Skills Repository
Gitee	https://gitee.com/onescience-ai/onescience	https://gitee.com/onescience-ai/oneskills
GitHub	https://github.com/onescience-ai/OneScience	https://github.com/onescience-ai/oneskills

Limitations and License

This dataset was converted from the original ECMWF ERA5 data and uses the same ECMWF CC-BY-4.0 license.