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  • January 24, 2022: SC-ACIS is now available using "https". The link should be: https://scacis.rcc-acis.org.
  • 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 https://acis-compare.rcc-acis.org. In most cases, this tool will be more useful than the Dataset Comparison Tool found under "Other Products".

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