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
   202502    -0.46
   202503    -0.33
   202504    -0.35
   202505    -0.37
   202506    -0.33
   202507    -0.27
   202508    -0.23
   202509    -0.20
   202510    -0.20
   202511    -0.24