What is the reason for the northwest wind blowing in winter?

Because the ocean temperature in winter in our country is higher than that on land. The air flow is always in the direction from cold air to hot air. So the winter wind always blows from the land to the southeast sea. So the northwest wind blows in winter.

In areas where the sea is located in the north (such as Tianjin), it is easy to blow the north wind in winter, and the reason should start from the formation of the wind. Wind is formed by air flow. On the ground, from low temperature to high temperature, which is what we usually call the wind direction.

In winter, the ocean currents in the sea also change more than in summer, mostly cold and cold. Due to the huge temperature difference between the ground and the sea surface formed by the cold current, a cold wind is formed. At this time, the temperature of the sea surface is much lower than the ground, and the formed wind blows to the land, that is, the north wind.

Extended data:

Monsoon climate is the main feature of China climate. The precipitation in China is mainly brought by the southeast monsoon, which brings water vapor to China. The southeast coastal areas of China will first get the water vapor brought by the southeast monsoon and form abundant precipitation, which will become the region with the richest annual precipitation in China.

Southwest monsoon also brings precipitation to China, which can affect South China. When the southwest monsoon develops strongly, it can also go deep into the Yangtze River basin. The tropical and subtropical regions in southern China are typical rainy and hot periods. Because the precipitation in China is mainly formed by the water vapor brought by the southeast monsoon, influenced by the summer monsoon, the precipitation gradually decreases from the southeast coast to the northwest inland.