This file area contains 1961-1990 PRISM 30-year climate normals datasets in the following gridded (raster) GIS data formats:

 1) BIL (.bil) - Band Interleaved by Line generic raster format
 2) ASCII GRID (.asc) - ArcInfo ASCII GRID raster format

In the filename, "01" = January, "02" = February, and so on. "14" is the Annual dataset.