Here's why:

* Low-lying: Stratus clouds form in the lower atmosphere, typically below 6,500 feet.

* Sheet-like: They are characterized by a flat, featureless, gray sheet that covers the entire sky.

* Stable atmosphere: Stratus clouds form in stable air, meaning there is little vertical movement. This lack of movement prevents the cloud from developing into other forms and results in relatively light precipitation.

However, it's important to note:

* Stratus clouds can sometimes be accompanied by heavier rain or snow, especially if they thicken or combine with other cloud types like nimbostratus.

* Stratus clouds can also be associated with fog, especially when they form near the ground.

So, while light precipitation is the most common association with stratus clouds, they can be linked to a range of weather conditions depending on their thickness and the surrounding atmospheric conditions.