The term FROSTY COVERING can be summarized as a RIME, which is a type of frost that forms when water vapor in the air freezes onto surfaces. It is a white, crystalline deposit of frozen water droplets that often appears on cold surfaces such as windows and trees. RIME is also known as hoar frost, white frost, or radiation frost. It is a common sight during winter months and can be seen in many places around the world.