As I mentioned the other day,this is what I left the house to seek out before dawn the other day. It is called hoar-frost and it is not snow but ice that accumulates on cold objects when the conditions are just right. Two days in a row the temperatures were in the single digits and one day it was all over the place and the next there was not even a single tree to be found with it. I have heard it referred to as radiation frost as well. Usually appears near streams or creeks in my experience.