that depends on what you are trying to do with them... there're some really huge files in there, too...
what are you trying to do?
i took a look at the site and at least for today, 20190222, the one file you referenced above doesn't exist...
i also noticed for some others, they were two days behind... like the files for the 15th were stamped the 17th...
if you can execute external programs from within FG, you might consider the wgrib2 programs to process externally and produce other formats you might easier use... for example, you could convert to csv and then do what you are trying to do... the problem there is having to distribute the binary for each OS and execute the right one when running...
https://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/but again, it depends on what you are trying to do... perhaps processing the file before flight and generating the needed data files for the flight which you can then use would be the thing to do? that way, folks who want it can run it and then go flying with the data...
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."