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
   201209    .468299
   201210    .296006
   201211    .162933
   201212    .140717
   201301    .063538
   201302    .070435
   201303    .019775
   201304   -.020844
   201305    .005096