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
   202007    -0.26
   202008    -0.51
   202008    -0.51
   202009    -0.88
   202010    -1.07
   202011    -1.16
   202012    -1.12
   202101    -0.94
   202102    -0.65
   202103    -0.34
   202104    -0.05