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
   201511     2.67
   201512     2.65
   201601     2.38
   201602     2.08
   201603     1.87
   201604     1.57
   201605     1.26
   201606     0.91
   201607     0.56
   201608     0.17