The National Weather Service has provided it's METAR Decoder Software Package to the public. The MDSP Library is a repackaging and modification of the original MDSP to compile and run on BSD and Linux (and pretty much any other OS).
METAR is a French acronym for Aviation Routine Weather Report. It is the standard format for reporting meteorological conditions. As a free service, the National Weather Service continually updates a server with METARs from all over the world.
The MDSP Library provides a programmer with two functions, the major one being DcdMETAR, which decodes a METAR into structures provided by the library. Also prtDMETR, which prints out a decoded METAR structure.
README, and added dmetar and libmetar.a to make clean. The code has remained unchanged, so I did not bump the version number.
Source: mdsplib-0.11.tar.gz