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
   202010    -1.19
   202011    -1.60
   202011    -1.60
   202012    -2.03
   202101    -2.21
   202102    -2.01
   202103    -1.51
   202104    -1.08
   202105    -0.78
   202106    -0.53
   202107    -0.19