Hi Bob, just to make sure I am on the same page, I assume you are referencing differences between, for example, this site, which shows CFSv2 November SST anomalies near zero, and the NMME site, which shows CFSv2 November SST anomalies that are clearly negative. That's a good question. Offhand, I do not know why there are such differences - I assume it mainly has to do with the way the climatology or bias correction is handled among the groups doing the data processing, but that's just a guess. I will look into it.