What is the date of the summer solstice? 202 1.

What is the summer solstice on 202 1: June 2 1,1:32: 00, Monday, and the summer solstice on May 12 of the lunar calendar is one of the 24 solar terms, and June 2 1 of the solar calendar every year. On the day of the summer solstice, the sun moves to 90 degrees of the yellow meridian (in Gemini), and the position of the sun directly on the ground reaches the northernmost point of the year, almost directly on the tropic of cancer. At this time, the sunshine time is the longest in the northern hemisphere. In Beijing, the daytime can be as long as 15 hours. On this day, the northern hemisphere gets the most sunshine, almost twice as much as the southern hemisphere.

Is the summer solstice the hottest day of the year? No, the summer solstice is not the hottest day of the year. It should be in the dog days.

The main reason is the role of the atmosphere. The atmosphere has a strong heat preservation effect. If there is no atmosphere, after the summer solstice, the sunshine time in the northern hemisphere will be shortened day by day, the heat received will be less and less, the heat lost will be more and more, and the temperature will drop day by day. However, due to the heat insulation of the atmosphere, the total sunshine time in a day is longer than the dark time, which means that the total heating time is longer than the heat dissipation time, so the temperature will continue to rise under the heat insulation of the atmosphere.

Climatic characteristics of summer solstice solar term 1, convective weather

After the summer solstice, the ground is heated strongly and the air convection is strong, and thunderstorms are often easy to form in the afternoon to evening. This kind of hot thunderstorm comes and goes, and the rainfall range is small. People call it summer rain over the mountains. Liu Yuxi, a poet in the Tang Dynasty, skillfully used this weather to write a famous poem: Rising in the East and Falling in the West, the Tao is sunny or sunny. The heavy precipitation brought by convective weather is not always as beautiful as described in the poem, and it often brings local disasters. In his poem "Summer Rain", the poet Xu Shuxin also appropriately described the thunderstorm weather in summer: sitting on the stage in midsummer, frogs chirping cicadas and flapping dust. The golden gong sounded like a thunderbolt, and the cold rain hit the face like money.

2. Rainstorm weather

In most cases, during the summer solstice, the middle and lower reaches of the Yangtze River and the Jianghuai basin are rainy and frequently rainstorm, which is easy to cause floods and even threaten people's lives and property. Attention should be paid to strengthening flood control.

3, Jianghuai Meiyu

The solstice season in summer is the rainy season in Jianghuai area. This is the yellow ripening period of plums in Jiangnan. The air is very humid. Cold and warm air masses meet here, forming a trough of low pressure, which leads to continuous rain.

4. Hot weather

Like the winter solstice, the summer solstice is also a solar term reflecting the changes of the four seasons. Astronomy stipulates that the summer solstice is the beginning of summer in the northern hemisphere. After the summer solstice, although the direct point of the sun began to move south from the Tropic of Cancer, the days in the northern hemisphere began to shorten gradually. For the Tropic of Cancer and its northern area, the height of the sun began to decrease day by day, but because the heat radiated from the sun to the ground is still more than that radiated from the ground to the air, the temperature will continue to rise in the future, so there is a saying that the summer solstice is not too hot.