The IEM maintains an archive of processed rain gauge data from the "Fisher Porter" equipment that is run at some NWS COOP locations in Iowa. There is considerable delay to the availability of this data from NCEI. Currently, a process runs on the 15th each month and downloads data for the previous 3rd, 6th, and 12th month to the current date.

Updated 3 Feb 2023: As it stands currently, I can not find this datasource available from NCEI. So there's no data in this archive since ~Feb 2021.

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