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  • January 24, 2022: SC-ACIS is now available using "https". The link should be:
  • May 4, 2021: All normals used in SC-ACIS are now for the period 1991-2020.
  • 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".

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