I was flying from Asia to Europe and noticed that the bottom of the window frame was ice cold while the top was warm. Why?

My theory: The sunlight warming the air between the "inner window" and the "actual window" causes the warm air to move up within the airplane hull. enter image description here

  • $\begingroup$ I will be surprised of such an appreciable gradient $\endgroup$ – Alchimista Nov 9 '17 at 19:08

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