# Historical Data

This section covers access to historical weather data (hindcasts) for comprehensive backtesting and model evaluation.

The [summary model & data table](/models-and-products/models-and-products.md#summary-available-models-and-data) contains information about data availability for the models we support.

## Hindcast Coverage

We provide as much hindcast data for backtesting as we can. Custom time periods are available upon request. Please contact us for more information on extended historical data access.

For detailed hindcast specifications model specifications, temporal coverage, and data availability, please refer to the individual model documentation:

* [EPT-1.5 Model](/models-and-products/jua-models/ept-1.5.md)
* [EPT-2 Family](/models-and-products/jua-models/ept-2.md)
* [ECMWF AIFS](/models-and-products/third-party-models/ecmwf-aifs.md)
* [ECMWF IFS](/models-and-products/third-party-models/ec-ifs.md)
* [ECMWF IFS Ensemble](/models-and-products/third-party-models/ecmwf-ens.md)
* [GFS NOAA](/models-and-products/third-party-models/gfs-noaa.md)
* [Microsoft Aurora](/models-and-products/third-party-models/microsoft-aurora.md)
* [DWD ICON Global](/models-and-products/third-party-models/dwd-icon-global.md)
* [DWD ICON-EU](/models-and-products/third-party-models/dwd-icon-eu.md)

## Accessing Historical Data

You can read and visualize our hindcast data through the [Jua Python SDK](/python-sdk/getting-started.md), or directly through Athena.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.jua.ai/historical-data.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.