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
   202410    -0.43
   202411    -0.79
   202412    -1.09
   202501    -1.10
   202502    -0.78
   202503    -0.41
   202504    -0.20
   202505    -0.14
   202506    -0.09
   202507     0.03