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
   202112    -1.00
   202201    -0.99
   202201    -0.99
   202202    -0.94
   202203    -0.91
   202204    -0.98
   202205    -0.98
   202206    -0.85
   202207    -0.71
   202208    -0.63
   202209    -0.64