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
   201207    .468072
   201208    .513233
   201209    .586945
   201210    .613068
   201211    .732147
   201212    .792236
   201301    .707092
   201302    .648071
   201303    .531799