Pat Shingleton: "Above 32 and Frost?"
I remember visiting with Dr. Murry Decoteau and Sam Roberts who continually "clean-out" Frank Miller and Mim Thompson in gin-rummy games. Murry inquired if frost forms when the temperature doesn't hit 32 degrees? In this scenario, the absolutes of frost forming include a clear night and calm winds. Air temperatures, slightly above 32 degrees and no higher than 34, can generate patchy frost. Frost is water vapor that has condensed as ice onto a surface. Blades of grass lose energy at night by emitting radiation and due to this energy loss they become more accessible to crystallization. If the deposited surface is colder than the surrounding air, "spicules" of ice grow from the surface. I explained this to Sam and Murry but they fell asleep.