But you can’t compare long-range/seasonal models with short-term models. They’re completely different in terms of parameterizations, equations, physics, etc.
Statistically climate models are more likely to be accurate.
but in terms of buying what the CPC is showing for 15-months...it has nothing to do with buying or selling...it’s not like they’re just pulling this out of their ass. Significant amount of work goes into the construction of these forecasts. Will every month end as so...perhaps not. But the fact of the matter is, given the climate regime we’re in AN is going to win out over BN.
further complicating matters is analogs and these correlations that were once a thing are losing merit b/c we’re continuing to find ways to yield temperatures overall which are warmer than average.