How do I know the weather?

Then you can only judge the weather by looking at the clouds.

Cumulonimbus clouds often produce thunderstorms, showers and snow, and sometimes hail.

Stratocumulus sometimes rains and snows, usually in small quantities.

In Mao Mao, stratus clouds can rain or snow.

There is often continuous precipitation in nimbostratus.

High-level clouds can drop continuous or intermittent rain and snow.

The above kinds are representative. If you know these kinds of clouds, it will be helpful for your travel. If you want to know all this, I suggest you buy a book about meteorology.