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
   201606     0.14
   201607    -0.14
   201608    -0.39
   201609    -0.56
   201610    -0.67
   201611    -0.73
   201612    -0.80
   201701    -0.74
   201702    -0.50
   201703    -0.12