This is only a summary of the available variables.  In total, there are  <a href="http://dss.ucar.edu/datasets/ds120.0/docs/parms.ds120.0.html"><b>51</b></a> variables.
 Monthly means are NOT available for total precipitation (parm=228), Instaneous X and Y surface stresses (229,230) and Instaneous moisture flux (232) from ds118.0.