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So, one thing I would caution folks is to not compare this dataset to point-based "man measuring with a ruler" type measurements.  This is a different quantity (snowfall toward Earth's surface) and therefore not subjected to influence from pavement, canopy, surface winds, etc. which tend to reduce amounts actually measured at the surface.  Overall the pattern and strength of the relationship is consistent with what we find in other datasets (see footnote #1).  

I should add that the counts map also tends to suggest there is a slight lean among the 13 El Ninos, but it is not strong in the DC area.  It won't stop me from wishing for more snow this winter though!