Cecil Adams says that that sometimes "official" snow depths are determined by, you know, sticking a ruler into the snow, and other times they are determined by collecting snow in one spot, melting it, and using some equation that turns "amount of water" into "inches of snow". I could imagine that there could be discrepancies between these approaches.
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Date: 2009-12-21 05:36 pm (UTC)Citation: http://www.straightdope.com/columns/read/150/how-do-they-measure-snowfall