Why does the temperature rise before it gets cold?

Generally speaking, before the arrival of cold air, the temperature will rise to varying degrees. Meteorologically, it is called the temperature rise before the cold front, that is, the south wind is mostly before the cold front and the northwest wind is mostly after the front. When the cold front passes by, it is still at the front end of the cold front. Under the control of the warm and humid airflow at the front end, the temperature will rise temporarily.

In addition, before the arrival of the general south wind, cold air will also aggravate the atmospheric warming. So before the arrival of cold air, the temperature in a certain area will rise briefly for about a day. After the cold front, the temperature will drop.

Extended data:

Behind the cold front, the temperature is lower. When cold and warm air masses meet, the density of cold air masses is high and that of warm air masses is low. As a result, the cold air mass was caught under the warm air mass and the warm air mass was forced to rise.

In the process of pushing the cold air mass, the warm air mass slowly slides up along the front under the influence of the heavy cold air mass. During the slow climb, the warm air mass cools and condenses into clouds, rain and other weather.