I uploaded an update to the R script I posted earlier to import data downloaded from WorldClim into GRASS. The main change is that it unzips and imports one grid at a time into GRASS, thus requiring much less free space on your hard-disk.
It moreover has the option to import and convert the layer to the region settings of the mapset you are working in. Alternatively, you can import rasters in their original extend and resolution. Continue reading Importing WorldClim climate .bil datalayers in GRASS GIS II