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
   201605     0.57
   201606    -0.06
   201607    -0.50
   201608    -0.84
   201609    -0.96
   201610    -1.04
   201611    -1.10
   201612    -1.22
   201701    -1.22
   201702    -1.06