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  • May 4, 2021: All normals used in SC-ACIS are now for the period 1991-2020.
  • February 13, 2020: If the SC-ACIS interface does not appear correctly in the panel to the left (i.e. it is plain, unformatted text), make sure tha the scheme of your url is "http", not "https". That is, the link should be:
  • January 25, 2018: A new tool has been developed to compare the data in the ACIS database to that in GHCN-Daily. This allows users to do things like see the quality flags attached to values in GHCN-Daily that (due to failed quality control) display as missing in ACIS. The tool is available at In most cases, this tool will be more useful than the Dataset Comparison Tool found under "Other Products".
  • January 10, 2018: Annual normals have been added to the Daily/Monthly Normals product.

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