How Far Does a Raindrop Fall—and Why Doesn’t Every Drop Reach the Ground?

A raindrop’s trip from cloud to ground seems simple: it forms in a cloud, falls through the sky, and lands in your yard. But quite a lot can happen along the way.

Raindrops can fall thousands of feet, change size, collide with other drops, break apart, and even disappear completely before reaching the ground.

That means the rain falling from a cloud isn’t necessarily the same rain that ends up in your rain gauge.

How Far Does a Raindrop Fall?

There’s no single distance because rain can fall from clouds at very different heights.

Low clouds may have bases only a few thousand feet above the ground, while thunderstorms can extend tens of thousands of feet into the atmosphere. The raindrops that eventually reach your garden generally begin their downward journey somewhere within the cloud rather than simply falling from its very top.

So a raindrop might travel a few thousand feet—or considerably farther—before it reaches the ground. And despite what you may have seen in cartoons, it doesn’t spend that entire trip accelerating faster and faster.

How Fast Does a Raindrop Fall?

As a raindrop begins to fall, gravity pulls it downward and it accelerates. But the faster it moves, the more air resistance pushes against it.

Eventually those forces balance. At that point, the drop reaches terminal velocity, meaning it continues falling at roughly the same speed instead of continuing to accelerate.

How fast it falls depends largely on its size. Tiny droplets fall relatively slowly, while larger raindrops can reach speeds of roughly 20 miles per hour. Very large drops don’t simply keep getting bigger and faster—they tend to become unstable and break apart.

The relationship between a drop's size, shape and speed is surprisingly interesting. Real raindrops aren't teardrop-shaped, and their shape changes as they grow and fall.

Raindrops Aren’t Really Teardrop-Shaped

The familiar teardrop-shaped raindrop is mostly an artistic invention.

Small raindrops are nearly spherical because surface tension pulls the water into a compact shape. As drops become larger and fall faster, air resistance flattens their bottoms, making them look more like tiny hamburger buns than tears.

If a drop becomes too large, airflow can distort it enough that it breaks into smaller droplets.

What Happens to Rain on the Way Down?

A raindrop’s journey actually begins long before it starts falling. Water vapor in the atmosphere typically condenses onto microscopic airborne particles called cloud condensation nuclei, such as sea salt, dust, smoke, or other aerosols. These form tiny cloud droplets, which can collide and combine with other droplets until they become large enough to fall as rain.

That transformation from invisible water vapor to cloud droplets and eventually precipitation is explored in more detail in How Rain Forms: From Water Vapor to Raindrops.

Once a raindrop begins falling, its size and shape can change considerably between the cloud and your yard.

Drops can collide and combine with other droplets. Larger drops can split apart. Wind can push falling rain sideways, sometimes carrying it well away from where it first began falling. That's one reason you can sometimes experience a sunshower, with rain falling even while the sun is shining.

Temperature and humidity also matter. If rain falls through a layer of dry air, some of the water begins evaporating before it ever reaches the surface.

And if precipitation passes through layers of air with very different temperatures, it may even change form completely. The atmospheric temperature profile helps determine whether precipitation ultimately reaches the ground as rain, snow, sleet or freezing rain.

Sometimes falling precipitation evaporates completely. That creates one of the more interesting rainfall phenomena: virga.

What Is Virga?

Virga is precipitation that falls from a cloud but evaporates—or sometimes sublimates—before reaching the ground.

You may have seen it without knowing its name. It often looks like wispy gray streaks hanging beneath a cloud, almost like curtains of rain that fade away before reaching the horizon.

From a distance, it can look as though an area is getting a good soaking. At ground level, however, it may be completely dry.

Why Does Rain Evaporate Before Reaching the Ground?

Virga is especially likely when the air below a cloud is dry.

As raindrops fall into that dry layer, water evaporates from their surfaces. Small droplets are particularly vulnerable because they have relatively little water and a large surface area compared with their volume.

If the layer of dry air is deep enough, the drops can disappear entirely before reaching the surface. This is one reason seeing rain falling in the distance doesn’t necessarily mean that rain is actually reaching the ground.

It's also a good example of why rain can fall even when the relative humidity at ground level is well below 100%. The conditions inside the cloud and throughout the atmosphere above you can be very different from the humidity measured at the surface.

Can Some Rain Evaporate Without Creating Obvious Virga?

Yes. Rain doesn’t have to disappear completely for evaporation to matter. Drops may lose some of their water as they fall and still reach the ground.

Wind can also move precipitation horizontally, so rain that begins falling above one location may reach the surface somewhere else. Combined with the small scale of many showers and thunderstorms, this helps explain why rainfall can vary so much across surprisingly short distances.

The atmosphere between the cloud and the ground is part of the rainfall story, too.

A Surprisingly Complicated Journey

For something so ordinary, a raindrop has a remarkably eventful trip. From its beginnings around a microscopic particle in a cloud to its fall through thousands of feet of changing air, even a single drop is shaped by gravity, wind, temperature, humidity, and the other drops around it.

There’s a lot more happening between cloud and ground than it appears from below.