We have had some light frosts, but I'm calling this morning as the first killing frost.
One of the TV weather forecasters said the weather condition we had this morning was a "fog frost," meaning that the heavy moisture that was in the air caused the fog as well as the vertical frost patterns. The moisture descended which created the little Christmas-tree like frost patterns.
No matter what it's called, it's cold and the walnut logs burning in the stove feel good.
