Holds monthly climate data for one or more pixels (a raster block) and exposes S4 methods for computing each of the 19 standard bioclimatic variables as well as the full batch computation. Each slot is a numeric matrix with 12 columns (one per calendar month) and one row per pixel; single-pixel inputs (plain numeric vectors of length 12) are automatically promoted to 1-row matrices by the constructor.
The S4 methods delegate to the compiled C++ routines exported by the
package (e.g. bio01_cpp, bioclim_cpp), mirroring the xbioclim
convention for all 19 variables.