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
   202108    -0.37
   202109    -0.70
   202109    -0.70
   202110    -1.10
   202111    -1.43
   202112    -1.54
   202201    -1.43
   202202    -1.19
   202203    -0.82
   202204    -0.46
   202205    -0.13