2 12 in gossip stands for rain. Really? What do other numbers mean?

2 12 stands for: cloudy and windy, but it doesn't rain.

Imagine this:

Heaven and earth are all earth, with only a little water in the middle, and at most it is turbid. How can it rain?

If you are an expert in divination, you don't need to listen to the weather forecast at all.

Where, when and what weather. I can totally know. It's not difficult.

There was no weather forecast for marching and fighting in ancient times. So,

How does Zhuge Liang "borrow the east wind"?

That's how I borrowed it.