KSMooniacs post in the OAT thread got me thinking about OAT and icing. He said that he likes to know the exact OAT up to 1dF accuracy. My IR is only two months old and I have no icing experience at all. I always thought that visible moisture below freezing level is not good. But is it also possible to be just above freezing level (lets say 1-2dC) and still pick up ice? E.g. if the airframe temperature is below freezing (due to a longer flight in colder temperatures)? Or is it negligible as onl