Files with bufr extension are used by BUFR meteorogical data program as a data file.
BUFR file extension - Binary Universal Form for the Representation
What is bufr file? How to open bufr files?
File type specification:
The bufr file extension is associated with Binary Universal Form for the Representation of meteorological data (BUFR). It is a binary data format maintained by the World Meteorological Organization (WMO). Its used for meteorological data.