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
   201204   -.266806
   201205   -.079375
   201206    .085876
   201207    .250305
   201208    .319672
   201209    .491577
   201210    .558685
   201211    .624756
   201212    .604523