How is autumn frost formed?

The formation of autumn frost is the condensation of water vapor in the air when the air near the ground cools below the frost point (dew point below 0 degrees Celsius) under the radiation cooling effect of the ground or objects.

Autumn frost is a weather phenomenon, and its formation is closely related to factors such as temperature and humidity. Generally speaking, autumn is warm during the day and cool at night, and the air humidity is relatively high. These conditions provide a foundation for the formation of autumn frost. The formation process of autumn frost usually occurs at night, and sometimes it begins to form in the oblique light before sunset, with the shape of white ice crystals. And autumn frost has an important impact on farmland. In the first frost solar term, the appearance of autumn frost means that the growth of crops has come to an end, and some crops may even be harmed by frost. At this time, farmers will need to take timely protective measures according to the situation of autumn frost to ensure the safe harvest of crops.