The height of the tropopause varies.
The tropopause is lowest at the poles, and most high at the equator.
At the poles the height is about 25000 feet, and temperature is -45 Celsius.
In the mid latitude, the height is 40000 feet, with a temperature of -55 Celsius.
And at the equator, the height is 55000 feet, with a temperature of -75 Celsius
