This spreadsheet is a compilation of borehole temperature observations compiled by the Colorado Geological Survey for use by the AASG geothermal data project, published as a Web feature service for the National Geothermal Data System. The document contains 6 worksheets, including information about the template, notes related to revisions of the template, Resource provider information, the data, a field list (data mapping view) and a worksheet with vocabularies for use in populating the spreadsheet (data valid terms). Data from 63,539 wells are included. Fields in the data table include observation URI, well names, well lease numbers, maximum and corrected measured temperatures, and location and measurement notes.