Well, as measured in 3 different places: 12"
As I have a large open back yard with no obstructions I can get a fairly accurate measurement, as there is nothing for the snow to drift against, nor obstruct the wind, so it is a fairly level "snow field".
Here is a picture I took last evening of my signals in the snow:
![](http://ic.pics.livejournal.com/lowen_kind/433826/50824/50824_900.jpg)
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