the first class (value 1) ... there are 543 cells that are the combination of snowdtptrec and mradiationrec (whatever those) represent. etc etc
some times it is better to make a table out of them like a pivot table
snow typ class
rad cla 1 2 3 4 5
1
2 8 (your last class)
3
4 543 (your first)
fill in the matrix