Hot and cold summer is a description of what season is hot and cold summer.

1, cold and hot summer are about winter and summer. Among them, severe cold, pinyin: yánhán, which means extremely cold, extremely cold. Dong Zhongshu's Rain and Hail Pair describes winter. Summer heat means that the summer weather has reached a very hot stage (three-volt solar terms). That is, extremely hot weather

2. Four seasons refer to four seasons that appear alternately in a year, namely, spring, summer, autumn and winter, and each season has three months. All the year round is formed because the earth revolves around the sun. Because of the existence of the ecliptic angle, the direct point of the sun moves back and forth between the north and south latitudes of the earth, which changes every year, resulting in the seasonal changes of the height of the sun at noon, the length of day and night, and the seasonal changes of the solar energy obtained in various places, thus forming the replacement of the four seasons.