Why is it often windy and rainy near the front?

There are usually thickening clouds, strong winds and precipitation near the front.

Before the warm front crossed the border, the weather was clear, the temperature was relatively low and the air pressure was relatively high. During the crossing, there was continuous precipitation in front of the front, and after the crossing, the weather was fine, the temperature rose and the air pressure decreased.

Before the cold front crossed the border, the weather was clear, the temperature was relatively high and the air pressure was relatively low. When crossing the border, there is strong wind and precipitation in front and behind. After crossing the border, the weather is fine, the temperature drops and the air pressure rises.

The cover of quasi-static front swings back and forth, and continuous precipitation appears near the front.

As for why it is precipitation before or after the front? This is because the physical properties of cold and warm air masses are different. The cold air mass is cold and heavy, and the warm air mass is warm and light. When the warm air mass is strong and the cold air mass is weak (that is, when the front is warm), the warm air mass climbs forward along the cold air mass, resulting in precipitation before the front. For a cold front, cold air is inserted into the bottom of warm air, forcing the warm air to rise, thus causing precipitation behind the front.