# Essential climate variables for assessment of climate variability from 1979 to present data download available again!

**URL:** <https://forum.ecmwf.int/t/essential-climate-variables-for-assessment-of-climate-variability-from-1979-to-present-data-download-available-again/1423>\
**Category:** C3S - Announcements\
**Tags:** c3s, ecv\
**Created:** [13 December 2019 10:53 UTC](https://forum.ecmwf.int/t/essential-climate-variables-for-assessment-of-climate-variability-from-1979-to-present-data-download-available-again/1423 "2019-12-13T10:53:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anabelle](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/anabelle/32/360_2.png) [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\
**Post date:** [13 December 2019 10:53 UTC](https://forum.ecmwf.int/t/essential-climate-variables-for-assessment-of-climate-variability-from-1979-to-present-data-download-available-again/1423/1 "2019-12-13T10:53:07Z")

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On December 13th, 2019, our scientists identified an issue with the&nbsp;[Essential climate variables for assessment of climate variability from 1979 to present](https://cds.climate.copernicus.eu/cdsapp#!/dataset/ecv-for-climate-change) dataset and access to the data from the Climate Data Store was temporally suspended.

We are pleased to announce that the dataset "[Essential climate variables for assessment of climate variability from 1979 to present](https://cds.climate.copernicus.eu/cdsapp#!/dataset/ecv-for-climate-change)" has been updated to correct for the following identified issues:

- Files for ERA5 adjusted surface air temperature were affected by an error in the processing, affecting mean and anomaly values for the period from 1979 to 2014.
- Files for ERA5 and ERA-Interim 12-month running mean statistics were affected by a minor bug.

These issues have now been fixed. Full details of changes are documented in&nbsp; the updated [Product User Guide for the "Essential Climate Variables for assessment of climate variability from 1979 to present](http://datastore.copernicus-climate.eu/c3s/published-forms/c3sprod/ecv-for-climate-change/PUG-ecv-for-climate-change_v3.pdf)  
 &nbsp;  
**Users who have previously downloaded the affected data are advised to download the corresponding files again**.&nbsp;

Copernicus User Support team, ECMWF

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**Author:** ![Anabelle](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/anabelle/32/360_2.png) [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\
**Post date:** [17 December 2019 14:57 UTC](https://forum.ecmwf.int/t/essential-climate-variables-for-assessment-of-climate-variability-from-1979-to-present-data-download-available-again/1423/2 "2019-12-17T14:57:24Z")

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Issue has been fixed! Please see details [here](https://confluence.ecmwf.int/x/B73aCQ)