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
   201109   -.676203
   201110   -.991275
   201111  -1.218048
   201112  -1.379547
   201201  -1.381775
   201202  -1.242310
   201203  -1.081116
   201204  -1.031860
   201205  -1.030762