tobifinn/CI2026Hackathon

This is the official dataset for the Climate Informatics 2026 hackathon. The goal of the data challenge is to machine learn the mapping from commonly predicted weather variables to the total cloud cover. 

The dataset contains fields from the ERA5 reanalysis product and the first AIMIP project. Both datasets are licensed under the CC-BY 4.0 license.

There are different types of dataset, as well as two different regions (region 1 and region 2). All data is either stored as zarr or as netCDF dataset. The zarr files are chunked along the time/sample axis and are compressed into streamable zip files. All data is stored as daily average. The following files are included:

Using the Hackathon starter kit, you can with these files the evaluation on the testing dataset, comparing your scores to the scores from the official Leaderboard.

Train data

• train.zarr.zip: The training data (1979-01-01 to 2018-12-31) from ERA5 for region 1, includes input fields and target fields.

Validation data from ERA5

• val_era5_region1.zarr.zip: The validation data (2019-01-01 to 2019-12-31) from ERA5 for region 1, includes input fields and target fields.
• val_era5_region2.zarr.zip: The validation data (2019-01-01 to 2019-12-31) from ERA5 for region 2, includes input fields and target fields.
• val_target_era5_region1.nc: The validation data (2019-01-01 to 2019-12-31) from ERA5 for region 1, includes target fields.
• val_target_era5_region2.nc: The validation data (2019-01-01 to 2019-12-31) from ERA5 for region 2, includes target fields.

Validation data from AIMIP and ERA5

• val_in_aimip_region1.zarr.zip: The validation data (1979-01-01 to 1979-12-31) from AIMIP for region 1, includes input fields.
• val_in_aimip_region2.zarr.zip: The validation data (1979-01-01 to 1979-12-31) from AIMIP for region 2, includes input fields.
• val_target_aimip_region1.nc: The validation data (1979-01-01 to 1979-12-31) for the AIMIP predictions based on ERA5 for region 1, includes target fields.
• val_target_aimip_region2.nc: The validation data (1979-01-01 to 1979-12-31) for the AIMIP predictions based on ERA5 for region 2, includes target fields.

Test data from ERA5

• test_in_era5_region1.zarr.zip: The test data (2020-01-01 to 2022-12-31) from ERA5 for region 1, includes input fields.
• test_in_era5_region2.zarr.zip: The test data (2020-01-01 to 2022-12-31) from ERA5 for region 2, includes input fields.
• test_target_era5_region1.nc: The test data (2020-01-01 to 2022-12-31) from ERA5 for region 1, includes target fields.
• test_target_era5_region2.nc: The test data (2020-01-01 to 2022-12-31) from ERA5 for region 2, includes target fields.

Test data from AIMIP

• test_in_aimip_region1.zarr.zip: The test data (2024-01-01 to 2024-12-31) from AIMIP for region 1, includes input fields.
• test_in_aimip_region2.zarr.zip: The test data (2024-01-01 to 2024-12-31) from AIMIP for region 2, includes input fields.
• test_target_aimip_region1.nc: The test data (2024-01-01 to 2024-12-31) for the AIMIP predictions based on ERA5 for region 1, includes target fields.
• test_target_aimip_region2.nc: The test data (2024-01-01 to 2024-12-31) for the AIMIP predictions based on ERA5 for region 2, includes target fields.

Disclaimer

Generated using or contains modified Copernicus Climate Change Service information . Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.