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
   202011    -1.23
   202012    -1.33
   202012    -1.33
   202101    -1.34
   202102    -1.24
   202103    -0.98
   202104    -0.80
   202105    -0.66
   202106    -0.55
   202107    -0.49
   202108    -0.57