And so as we get into the century, we're looking at more climate change and potentially big disruptions of what have been lost of past weather systems. (scientificamerican.com)
By your own admission, we simply don't have enough data to verify past weather... or climate conditions rendering it impossible to say how valid the models actually are. (illconsidered.blogspot.ru)
It will show no more skill than taking the statistical average of past weather. (wattsupwiththat.com)