# How cold is it at 30 000 feet in the air?

On aircraft which fly above 30,000 feet, the temperature can often can get to temperatures below Jet-A's freezing point. For example: at 36,000 feet the standard outside air temperature is -56.5°C (-69.7°F) and is well below Jet-A's freezing point of -40°C/F.
A.

### What is the average temperature at 35000 feet?

At 35,000 ft. (11,000 m), the typical altitude of a commercial jet, the air pressure drops to less than a quarter of its value at sea level, and the outside temperature drops below negative 60 degrees Fahrenheit (negative 51 degrees Celsius), according to The Engineering Toolbox.
• #### How many feet high does an airplane fly?

Generally, the rule is “the higher the better” for jet engine performance, because the thinner air imposes less drag on the aircraft. There is a trade-off between fuel efficiency and power, and this optimum range occurs at 30,000 to 40,000 feet.
• #### What height does a plane fly at?

Commercial aviation jets fly at 30–38,000 feet to maximize fuel economy and speed. Military fighter jets can fly up to about 50,000 feet. Most commercial aircraft can fly up to 41,000 feet. Some large business jets can operate up to 51,000 feet.
• #### Can you see the curvature of the earth from an airplane?

Look there are two ways to see the curvature of Earth, either you go up or you go to a beach. You should be able to detect it from an aeroplane at a cruising height of around 10,600 metres (35,000 feet), but you need a fairly wide field of view (ie 60 degrees) and a virtually cloud-free horizon.
B.

### Why do airplanes fly at 40000 ft?

The cruising altitudes for short flights are usually less as compared to the cruising altitude for longer flights. High altitude means less power is needed to propel the plane and at 40,000 feet the engines are just above idle power. These were just some reasons why aircrafts travel high up in the air.
• #### Why do planes have to dump fuel?

Fuel dumping (or a fuel jettison) is a procedure used by aircraft in certain emergency situations before a return to the airport shortly after takeoff, or before landing short of its intended destination (emergency landing) to reduce the aircraft's weight.
• #### How many miles is it to get to space?

The shortest distance between Earth and space is about 62 miles (100 kilometers) straight up, which by general accord is where the planet's boundary ends and suborbital space begins.
• #### How high can you fly a helicopter?

Turbine-engined helicopters can reach around 25,000 feet. But the maximum height at which a helicopter can hover is much lower - a high performance helicopter like the Agusta A109E can hover at 10,400 feet.

Updated: 3rd December 2019