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
   201508     1.79
   201509     2.01
   201510     2.25
   201511     2.35
   201512     2.20
   201601     1.82
   201602     1.46
   201603     1.20
   201604     0.87
   201605     0.46