Global SST and Anomalies:

Data Source: OISSTv2  NOAA CPC
Truncated Data Length: Last 14 months
Clim Period: 1971-2000

Sample Plot Scripti (also the executable command): draw_plots_current.sh 
Makes call to grads scripts:
seasonal SST and Anomalies
monsst_global.gs
and
seasonal SST and Anomalies
seasst_global.gs

Note: The grads scripts can be modified to plot 14 past monthly SST and Anomalie or 12 past seasons (3monthly).