Well that explains the cooler springs....I think you said that May was the month most likely to have a -NAO, does that have to do with lack of ice cover in the Arctic?
Also the blocking last winter was south based but we still had good snows, does that mean that ANY -NAO even a south or east based one is better than any +NAO?
Also interesting that we had our strongest -NAO on record in 2009-10, did it flip to a +NAO for our hottest summer on record in 2010 and then back to strongly -NAO again for the 2010-11 winter, Chris?