Summer is the first of the 24 solar terms.

Summer is the fourteenth of the twenty-four solar terms. In summer, it is "going out of summer", which means leaving in the heat. In summer, the direct point of the sun continues to move southward, the solar radiation weakens, the subtropical high also withdraws southward, the temperature gradually drops, and the summer heat gradually disappears. The arrival of summer means that the hot and difficult weather is over. During this period, the weather is still hot, but it has shown a downward trend.

Summer solar terms are in the period of short-term high-temperature weather (autumn tiger), which generally occurs between August and September in the Gregorian calendar. The duration of autumn tigers generally ranges from half a month to two months.

On this day in summer, people can obviously feel that the sun is beginning to turn south. As the height of the sun decreases, the heat it brings will also decrease. The heat has gradually subsided. Although the summer heat is decreasing and the temperature will not suddenly rise, there will still be short-term reheat weather during this period, but it is not really cool. It usually gets cold after a thousand years.

After summer, the temperature gradually decreases and the temperature difference between day and night gradually increases, but the temperature is still high during the day. The reasons for this phenomenon are as follows: first, the direct point of the sun continues to move southward, and the solar radiation decreases; Second, the subtropical high moved southward by leaps and bounds, and the Mongolian cold high began to itch to try.