I'd guess it's a half inch. As you can see we still have most of the leaves on the trees since we've only had 3 days (only the last three days) with a low below freezing since April 8, 2017. Today's high is only going to be in the mid 20's F ( -4C) and tonight's low is expected to set a new record low for this time of the year 15F ( -10C).