Summer is the first solar term and the twelfth solar term among the twenty-four traditional solar terms in China. The hot summer is also the last solar term in summer, which indicates that the weather has reached the hottest stage and the temperature has begun to rise gradually. The summer heat usually occurs around July 22nd every year. According to the lunar calendar, the hot summer is in the middle or late June of the lunar calendar, and the specific date fluctuates according to the different solar years.
To determine the specific date of the summer heat, we need to consider the solar year and the lunar calendar, and at the same time, we need to make appropriate adjustments according to different countries or regions. In the traditional farming culture of China, the arrival of the great summer heat means that the growth of crops has entered a critical period, and farmers will arrange their farming activities reasonably according to the date of the great summer heat.
Meteorological changes during the great summer heat
The summer solar term is the period with the strongest sunshine and the highest temperature in South China, the period with the richest rainfall, the most common thunderstorm and the most concentrated high temperature days in the west of South China, and the period with the highest temperature above 35℃ in the east of South China. The intense heat is also the hottest period of the year in most parts of China. Except for the Qinghai-Tibet Plateau and Northeast China, the weather is hot in most areas, and the high temperature of 35℃ is a common occurrence, and the high temperature of 40℃ often occurs. There is little difference in temperature between the south and the north of this country.
At the end of July (seven drops and eight liters), it is equivalent to the period from the hot summer to beginning of autumn. With the seasonal northward movement of the subtropical high circulation system, the southwest monsoon will also push northward. The southwest wind outside the subtropical high will transport the tropical and subtropical warm and humid airflow to the northern region, where it will meet the cold air in the middle latitudes of North China and Northeast China, and North China and Northeast China will begin to enter the rainy season. Northwest China is the arid area with the least annual precipitation in China, because it lives inland and far from the ocean.