How do planes fly in rain?

Rain is generally not enough to keep a plane from taking off. The wings and engines of today’s aircraft work together to produce “lift,” which moves the plane upward off the ground by changing the direction and pressure of the air. While heavy rain can disrupt airflow over the wings, this effect is generally minor and, in general, rain doesn't impede this process.

This is true both when it comes to takeoff, as well as when a plane is at cruising altitude (usually around 35,000 feet), since liquid rain occurs at lower levels of the atmosphere (while any moisture at 35,000 feet is typically in the form of ice crystals or snow). This is why skies outside an airplane window in mid-flight are typically clear, even if the weather on the ground is rainy or overcast.

How much rain can ground a plane?

The volume of rain is rarely enough to ground a flight. Lift can occur regardless of how heavy it's raining, and although intense rain can theoretically reduce the maximum lift coefficient of a wing, modern aircraft are designed to compensate.

Within this paradigm, two main issues come up: visibility and auxiliary weather conditions. Pilots are trained for various weather conditions and use a combination of instruments and technology to safely operate the aircraft on wet runways and times when visibility is reduced. However, if rain is too heavy, the pilot’s visibility can be reduced below the safety minimums, which can make it unsafe to taxi, takeoff, or land.

While modern jet engines are rigorously tested and certified to take in large amounts of water without performance issues, pilots carefully monitor conditions when there is heavy precipitation paired with other severe weather to ensure the engines' combustion remains stable.

Do planes fly in freezing rain?

Freezing rain is a serious concern in aviation, but it's handled through rigorous safety procedures both on the ground and in the air. Let's look at each.

On the ground, if it's raining while temperatures are at or below freezing, ice can accumulate on the aircraft while it is parked at the gate. Even a small layer of ice can disrupt airflow over the wings and reduce lift. To prevent this from happening, ground crews perform a procedure you've probably heard mentioned before called de-icing. What they do is spray a specialized fluid on the plane to both melt existing ice and prevent new ice from forming before takeoff. The runway is a different issue. If it's too icy or slick for safe takeoff, the flight will be delayed until the tarmac is treated and conditions are safe again.

At high altitudes, pilots avoid areas where very cold droplets can freeze on contact with the aircraft. That's because ice accumulation on the wings can increase drag, decrease lift, and potentially cause the plane to stall.

Although this all sounds a bit scary, modern aircraft, pilots, and ground crews are well equipped to handle these issues. Many planes use heated surfaces on parts of the wings and engines. Pilots are trained to identify icing conditions and take corrective actions, and they use sophisticated radar to monitor atmospheric conditions and navigate through them. And, as mentioned, ground crews perform de-icing procedures on the planes and clear the runway.

Can planes land in the rain?

Just like with takeoff, the main challenge during landing is reduced visibility. If heavy rain makes it impossible for pilots to see the runway clearly, they will wait for conditions to improve. While heavy rain can make runways wet, aircraft tires are specifically engineered to maintain grip and prevent hydroplaning. However, freezing temperatures remain the true hurdle, as a frozen or icy runway can become unsafe for landing regardless of the pilot's visibility.

Final thoughts: Can planes fly in rain?

So, the next time you see rain pouring at the airport, you can rest easy knowing that modern aircraft are built to handle it with ease. Sit back, relax, and enjoy your flight — your pilots and crew have everything fully under control!