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May 10, 2018: ThreadEx Phase 3 sites have been added to station lists.

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

January 24, 2018: xmACIS is now available via https.

January 10, 2018: Annual normals have been added to the Daily/Monthly Normals product.