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
   202302    -0.40
   202303    -0.12
   202304     0.12
   202305     0.33
   202306     0.59
   202307     0.84
   202308     1.02
   202309     1.17
   202310     1.29
   202311     1.41