How many photos of the frosty outside did you take this morning? Technically, it's called hoar frost. Here's an explanation: "Under clear frosty nights in winter soft ice crystals might form on vegetation or any object that has been chilled below freezing point by radiation cooling. This deposit of ice crystals is known as hoar frost and may sometimes be so thick that it might look like snow." WE WELCOME INCON VIEWERS' PHOTOS. PLEASE SEND YOUR FROST PHOTOS TO: [email protected].