How to know in advance that it will rain?

Since ancient times, people have been familiar with early warning signals before rain, such as frogs chirping and swallows flying low, with high accuracy. There are several others:

Ants crossing the road-ants digging holes in the ground think that the holes will be flooded when it rains, that is, they will run away before it rains.

Earthworms come out of the hole-the ground is wet and soft, and earthworms will climb out of the ground, which indicates that it will rain.

Before the rain, there were signs of mosquitoes swarming, rain ants swarming and cats washing their faces.