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
   201611    -0.55
   201612    -0.47
   201701    -0.43
   201702    -0.41
   201703    -0.35
   201704    -0.30
   201705    -0.21
   201706    -0.08
   201707     0.01
   201708    -0.02