Interesting correlations here. So when NYC gets 4" of snow, PHL gets 4" 49% of the time but BOS gets it 64% of the time. When BOS gets 4 inches of snow, NYC gets it 42% of the time but PHL only 26% of the time. When PHL gets 4" of snow NYC gets it 67% of the time but BOS also gets it 54% of the time. This shows that all three have somewhat distinct climates from each other. If we compare PHL to BWI and DCA, I think we'll see a stronger correlation there than with PHL and NYC.