A very dry climate with little or no rain or snow is called a arid climate.

Here are some other terms used to describe such climates:

* Desert climate: This term is often used interchangeably with arid, but it specifically refers to areas with very low precipitation and sparse vegetation.

* Hyperarid: This term is used for the driest of all arid climates, with even less precipitation than a desert.

* Semi-arid: This term describes a climate that receives slightly more precipitation than an arid climate, but still experiences a prolonged period of dryness.

It's important to note that the exact definition of "very dry" can vary depending on the context.