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
   202301    -0.77
   202302    -0.52
   202303    -0.28
   202304    -0.01
   202305     0.22
   202306     0.49
   202307     0.75
   202308     0.92
   202309     1.03
   202310     1.13