CFS PDFC Seasonal SSTs
1st rec: avg(lastbs-1, lastobs, cfs month 1)
2nd rec: avg(lastbs, cfs month 1, cfs month 2)
other records: CFS 3-mo average
 TrgSeason    SST34
   201200   -.982928
   201201  -1.003909
   201202   -.864075
   201203   -.720673
   201204   -.582336
   201205   -.520935
   201206   -.549469
   201207   -.514343
   201208   -.466278