Frost. It's an in intricate process known as deposition that unfolds during the overnight hours this time of year. Typically water vapor condenses to form clouds, fog, dew and precipitation. However, when the temps fall below freezing, this water vapor doesn't have a chance to even get that far...It just deposits itself as ice crystals on any surface it can find and skips the whole condensation process. We do not see the morning dew/ fog until the temps rise and this ice can melt. Lesson? Frost is not frozen morning dew. It's something much cooler than that