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  1. Pages
  2. Data & charts support
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Data and charts FAQs

  • Created by Kathy Maskell, last modified by Helene Blanchonnet on May 20, 2022


Problems with data access - general

  • How do I get ECMWF forecasts?
  • What does real-time forecast data mean?
  • Why can't I access ECMWF data?
  • What is the format of ECMWF data?
  • How do I convert GRIB edition1 to GRIB edition 2?
  • Why don't I see the parameters I have requested in my GRIB file but see other parameters instead?
  • Is there any software available for horizontal interpolation of data?
  • Where can I find information on the units of meteorological fields?
  • What are the criteria to qualify for a Research Project licence?
  • What to expect when using the MARS WebAPI?

Problems with accessing or receiving real-time forecast data

  • Why haven't I received my ECMWF forecast data?
  • Why is the dissemination of my ECMWF forecast data so slow?
  • Can I change the real-time forecast data I receive?

Problems with data pricing and licensing

  • 2022 changes to ECMWF licensing
  • FAQs - new service charge model (01 July 2022)
  • How do I amend an existing licence for access to ECMWF data?
  • How do I arrange a research licence for access to ECMWF data?
  • How do I request a small business discount for ECMWF data?
  • What ECMWF forecasts can I access for free?
  • What does Open Data in October 2025 mean for me?

Problems accessing archive data/using the Web API/MARS

Please see Web API FAQ



News

Blog Posts

  • Blog: August 2025 (Nr. 5): Updates from ECMWF Data Support created by
    Yigit Altintas
    Aug 28, 2025
    Data and Charts
  • Blog: May 2025 (Nr. 4): Updates from ECMWF Data Support created by
    Yigit Altintas
    May 26, 2025
    Data and Charts
  • Blog: April 2025 (Nr. 3): Updates from ECMWF Data Support created by
    Yigit Altintas
    Apr 09, 2025
    Data and Charts
  • Blog: February 2025 (Nr. 2): Updates from ECMWF Data Support created by
    Yigit Altintas
    Feb 13, 2025
    Data and Charts
  • Blog: January 2025: Updates from ECMWF Data Support created by
    Yigit Altintas
    Jan 13, 2025
    Data and Charts

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