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
   202006    -0.15
   202007    -0.35
   202007    -0.35
   202008    -0.61
   202009    -0.92
   202010    -1.06
   202011    -1.18
   202012    -1.27
   202101    -1.22
   202102    -0.96
   202103    -0.53