CFSv2 Seasonal SSTs (clim19822010)
first  rec: avg(lastbs-1, lastobs, CFSv2 month 1)
second rec: avg(lastbs, cfs month 1, CFSv2 month 2)
last   rec: CFSv2 month 9
other  rec: CFSv2 3-mo average
 TrgSeason    SST34
   201501     0.60
   201502     0.59
   201503     0.67
   201504     0.71
   201505     0.79
   201506     0.88
   201507     0.95
   201508     0.89
   201509     0.90
   201510     1.03