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
   202111    -0.97
   202112    -1.16
   202112    -1.16
   202201    -1.25
   202202    -1.19
   202203    -1.03
   202204    -0.91
   202205    -0.73
   202206    -0.46
   202207    -0.17
   202208     0.11