RNetCDF provides an R interface to the NetCDF file format designed by Unidata for efficient storage of array-oriented scientific data and descriptions. This R interface is closely based on the C API of the NetCDF library, and it includes calendar conversions from the Unidata UDUNITS library. The current implementation supports operations on NetCDF datasets in classic, 64-bit offset and netcdf4-classic file formats. Work is progressing to add full support for netcdf4.
An introduction to the RNetCDF package is given in http://journal.r-project.org/archive/2013-2/michna-woods.pdf .