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
   201506     1.27
   201507     1.61
   201508     2.01
   201509     2.47
   201510     2.82
   201511     2.89
   201512     2.61
   201601     2.10
   201602     1.61
   201603     1.23