Hoar Frost - 2007 - 12 - 17 - SPI – 02
Our River Birch had a lovely coating of Hoarfrost this AM. This shot was taken standing in my driveway looking up!
Definition From Wikipedia: White frost is a relatively heavy coating of hoar frost with big and interlocking crystals. It forms when the air has a relative humidity above 90% and a temperature below -8 °C (18 °F).