18 18 when is the summer solstice?

The summer solstice of 20 18 is June 2 1.

The summer solstice is the 10 of the 24 solar terms. Fighting means noon; The yellow meridian of the sun is 90 degrees; June 2 1 ~ 22 of Gregorian calendar. On the day of summer solstice, the position where the sun shines directly on the ground reaches the northernmost part of the year, almost directly on the tropic of cancer. At this time, the daylight hours in all parts of the northern hemisphere reach the longest in the whole year. For the Tropic of Cancer and its northern region, the summer solstice is also the highest day at noon in a year. The solstice in summer is the turning point of the sun's northward movement.

After the summer solstice, the direct point of the sun began to move south from the Tropic of Cancer, and the days in the northern hemisphere began to shorten gradually. For China, which is located in the north of the Tropic of Cancer, after the summer solstice, the height of the noon sun begins to decrease day by day; For China, which is located in the south of the Tropic of Cancer, after the summer solstice, the height of the sun returned to the south at noon, and it began to decrease day by day after the sun shone again.

High temperature, high humidity and occasional thunderstorms are the weather characteristics from summer to the future. The summer solstice is in midsummer, that is, at noon, belonging to the sun; Although summer is full of yang and the daytime is the longest, it is not necessarily the hottest day of the year, so the heat near the surface is still accumulating and has not reached the maximum.

Meteorological changes in summer solstice;

1, temperature and precipitation

After the summer solstice, although the direct point of the sun began to move south from the Tropic of Cancer, and the days in the northern hemisphere began to shorten gradually, the temperature will continue to rise for a while, because the heat radiated from the sun to the ground is still much more than that radiated from the ground to the air, so there is a saying that the summer solstice is not too hot. As the saying goes, "it's a hot day in dog days", and the real hot day is from mid-July to mid-August on the Gregorian calendar.

2. 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 "dividing fields in summer and rain". Liu Yuxi, a poet in the Tang Dynasty, skillfully used this weather to write a famous poem, "The east rises and the west falls, and the road is sunny and sunny."

3, Jianghuai Meiyu

Summer solstice season is the "Meiyu" season in Jianghuai area. This is the yellow ripening period of plums in Jiangnan. The air is very humid, and cold and warm air masses meet here to form a trough of low pressure, which leads to rainy weather.