When we are flying, why does the outdoor temperature show MINUS 50 degrees even in summer?

In order to explain why the outdoor temperature shows-50 degrees when flying in summer, we need to consider the changes of the altitude of the aircraft and the atmospheric temperature.

First of all, when flying, the plane usually flies at a higher altitude to avoid weather conditions and obtain better flight performance.

The atmospheric temperature decreases with the increase of altitude, because gas molecules in the atmosphere will absorb and radiate energy. The higher the altitude, the less energy gas molecules absorb and radiate, so the temperature will gradually decrease.

In addition, when aircraft fly in summer, the moisture content in the atmosphere is usually high, which will lead to an increase in the partial pressure of water vapor in the atmosphere, thus further reducing the temperature.

Therefore, even when flying in summer, we will still feel the outside temperature is around 50 degrees below zero due to the changes of aircraft altitude and atmospheric temperature.