At which peak does the precipitation in the weather system mainly appear?

Before the warm front and after the cold front.

. The precipitation of weather system mainly occurs before warm front and after cold front. When the front is active, warm and humid air often rises on a large scale on the front. Warm and humid air contains a lot of water vapor because of its high temperature and high humidity. In the process of rising, the air gradually cools, and the water vapor in it condenses into liquid water or ice crystals, forming precipitation. Frontal precipitation is characterized by large range, low intensity and long duration.