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
   202411    -0.48
   202412    -0.77
   202501    -1.00
   202502    -0.87
   202503    -0.63
   202504    -0.52
   202505    -0.50
   202506    -0.46
   202507    -0.39
   202508    -0.33