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<b>An analysis-ready, cloud-optimized (ARCO) edition of ERA5, the fifth-generation global
reanalysis from the Copernicus Climate Change Service (C3S) at ECMWF. Provided as a single
Icechunk + Zarr v3 store on AWS S3, this version enables efficient, scalable access to global
reanalysis data for weather, climate, and ML/AI applications. Managed by [Earthmover](https://earthmover.io).</b>
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ERA5 provides hourly estimates of atmospheric, land-surface, and ocean variables from 1940 to
2025 on a ~31 km (0.25°) global latitude-longitude grid. This Earthmover edition delivers 35
single-level (surface) variables, 8 pressure-level variables on 13 isobaric levels
(50–1000 hPa), and a curated 500 hPa geopotential slice, all with CF-1.7 compliant metadata.
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The store is organized into three top-level groups (single, pressure, and 500hPa). Each group
is provided with two complementary chunking strategies that hold identical data: a "spatial"
layout (one full global map [...]
Overview
An analysis-ready, cloud-optimized (ARCO) edition of ERA5, the fifth-generation global
reanalysis from the Copernicus Climate Change Service (C3S) at ECMWF. Provided as a single
Icechunk + Zarr v3 store on AWS S3, this version enables efficient, scalable access to global
reanalysis data for weather, climate, and ML/AI applications. Managed by Earthmover .
ERA5 provides hourly estimates of atmospheric, land-surface, and ocean variables from 1940 to
2025 on a ~31 km (0.25°) global latitude-longitude grid. This Earthmover edition delivers 35
single-level (surface) variables, 8 pressure-level variables on 13 isobaric levels
(50–1000 hPa), and a curated 500 hPa geopotential slice, all with CF-1.7 compliant metadata.
The store is organized into three top-level groups (single, pressure, and 500hPa). Each group
is provided with two complementary chunking strategies that hold identical data: a "spatial"
layout (one full global map per hour) optimized for map-style and regional queries, and a
"temporal" layout (long time series in small spatial tiles) optimized for time-series
extraction, location-based analysis, and ML training workflows. Arrays are stored as Float32
with PCodec compression for high compression ratios.
Only lossless compression has been applied; data values are bit-for-bit identical to raw ECMWF NetCDFs.
The data is provided in the Icechunk format.
Icechunk is an open source tensor storage engine that augments Zarr with transactional updates,
version history, and an optimized, Rust-based I/O path for maximum performance in the cloud.
An interactive browser for the data is available via the Earthmover Data Marketplace:
https://app.earthmover.io/marketplace/6a19bcfe9aa6e97720a2fad2?tab=dataset
Earthmover maintains two complementary ERA5 datasets:
- This one, updated at quarterly frequency, available free under an open license.
- A low-latency version with the same variables, but updated daily with the latest ERA5T near-real-time data. This is available at a competitive price and comes with a strong SLA. See ERA5 (Daily Updates) on the Earthmover Data Marketplace.
If your organization is using ERA5 in a serious operational context, please consider subscribing
to the low-latency version of this dataset.
Paid subscribers for the low-latency dataset are what make it sustainable for us to provide this
high-quality free, open dataset.
Contact sales@earthmover.io to learn more.
The ERA5 dataset is public and can be opened directly from S3 with the
Icechunk and Xarray libraries:
Alternatively, you can use the Arraylake client for a more concise syntax.
The dataset is assembled from the NSF NCAR Curated ERA5 archive and the Copernicus Climate Data Store. It is widely used for ML/AI training, climate and weather research, extreme-event analysis, and applications such as renewable energy siting.
Features and programs
Open Data Sponsorship Program
This dataset is part of the Open Data Sponsorship Program, an AWS program that covers the cost of storage for publicly available high-value cloud-optimized datasets.
Pricing
This is a publicly available data set. No subscription is required.
Legal
Content disclaimer
Vendors are responsible for their product descriptions and other product content. AWS does not warrant that vendors' product descriptions or other product content are accurate, complete, reliable, current, or error-free.
Delivery details
AWS Data Exchange (ADX)
AWS Data Exchange is a service that helps AWS easily share and manage data entitlements from other organizations at scale.
Open data resources
Available with or without an AWS account.
- How to use
- To access these resources, reference the Amazon Resource Name (ARN) using the AWS Command Line Interface (CLI). Learn more
- Description
- ERA5 Zarr / Icechunk Data (Cloud-Optimized) - Icechunk store at s3://earthmover-icechunk-era5/icechunkV2
- Resource type
- S3 bucket
- Amazon Resource Name (ARN)
- arn:aws:s3:::earthmover-icechunk-era5/icechunkV2
- AWS region
- us-east-1
- AWS CLI access (No AWS account required)
- aws s3 ls --no-sign-request s3://earthmover-icechunk-era5/icechunkV2/
- Description
- Notifications for the ERA5 Zarr + Icechunk dataset
- Resource type
- SNS topic
- Amazon Resource Name (ARN)
- arn:aws:sns:us-east-1:871265417473:earthmover-icechunk-era5-object_created
- AWS region
- us-east-1
Resources
Vendor resources
Support
Contact
Managed By
How to cite
Icechunk ERA5 was accessed on DATE from https://registry.opendata.aws/earthmover-era5 .
License
Creative Commons Attribution 4.0 International (CC-BY 4.0) - https://creativecommons.org/licenses/by/4.0/
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