CFSv2 Seasonal SSTs (clim19912020)
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
   202506     0.02
   202507    -0.04
   202508    -0.26
   202509    -0.50
   202510    -0.64
   202511    -0.65
   202512    -0.60
   202601    -0.47
   202602    -0.29
   202603    -0.10