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
   201610    -0.58
   201611    -0.60
   201612    -0.60
   201701    -0.59
   201702    -0.41
   201703    -0.14
   201704     0.06
   201705     0.19
   201706     0.32
   201707     0.48