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
   201505     1.13
   201506     1.37
   201507     1.67
   201508     1.87
   201509     2.09
   201510     2.33
   201511     2.50
   201512     2.36
   201601     1.99
   201602     1.58