The picture of BA38 (777) on low approach just before its crash-landing at Heathrow famously showed frost on the underside of the wings from the cold-soaked fuel tanks.
Had it made the runway safely, no doubt that frost would have melted and dripped off the wings, as well.
Conversely, on arrival in humid San Juan once, the humidity condensed on the entire cold-soaked airframe, fogging the cabin windows during taxi-in.