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
   202201    -0.86
   202202    -0.81
   202202    -0.81
   202203    -0.91
   202204    -1.07
   202205    -1.14
   202206    -1.06
   202207    -0.98
   202208    -0.91
   202209    -0.90
   202210    -0.88