The weather is dry, why doesn't it rain?

The weather is dry because there is not enough water vapor in the air, so it certainly won't rain.

The current level of science and technology can't control the weather manually.

Artificial rainfall should also artificially supplement some necessary conditions for precipitation formation according to the principle of precipitation formation in nature, so as to prompt cloud droplets to quickly condense or contact and grow into raindrops and land on the ground.

At a certain temperature, when the air can't hold more water vapor, it is called saturated air.

When the water vapor in saturated air matches the temperature, there will be no water vapor condensation, but when the air reaches the supersaturated state, excessive water vapor will be generated and water vapor condensation will occur.