What are the characteristics of the four seasons?

1. In spring, the northern hemisphere of the earth begins to tilt towards the sun, and more and more sunlight shines directly, so the temperature begins to rise. As the ice and snow melt, the water level of the river rises. In spring, plants begin to sprout and grow, and many flowers bloom. Hibernating animals wake up, many animals that lay eggs for the winter hatch, and birds begin to migrate, leaving the wintering ground and heading for the breeding ground. Many animals are in estrus at this time, so China also called spring "estrus". Everything revives. The changes of temperature and biology in spring also affect people's psychology and physiology. Spring is the first season of the year. There are many ways to divide the four seasons. In daily life, people usually regard the arrival of beginning of spring solar terms as beginning of spring, and beginning of spring is defined from the perspective of astronomy. Meteorological departments generally divide the four seasons according to the solar calendar, and March-May is spring. However, this division method has a disadvantage. According to this method, March in China belongs to spring. At this time, the peach blossoms in the Yangtze River valley are in full bloom and the green leaves are swaying, but Heilongjiang Province is still freezing, and Hainan Island has a summer atmosphere. Therefore, meteorologists have formulated a standard for dividing the four seasons, which should be as close to the natural scene as possible. Based on the five-day average temperature, when the average temperature in the last five days reaches 10, winter begins to enter spring. When the temperature is higher than 22, it means the end of spring and the beginning of summer. 2. The summer high temperature in the northern hemisphere is the most obvious climate feature. Due to the differences between regions and dry and wet environments, there will be a dry and hot climate or a wet and rainy climate. In China, the coastal areas were heated inland in May, and a low pressure was formed in the southwest, resulting in the southwest monsoon. The southwest monsoon reaches the coastal areas of China in May. At this time, the northeast monsoon will be blocked by the southwest monsoon, which is rarely affected in summer. It will not be affected until the end of August to mid-September. The arrival of the first southwest monsoon in China marks the beginning of summer. In May in midsummer, the weather in the north is still very cold. The cold air in the north meets the southwest monsoon in the south, forming a trough of low pressure in the South China Sea, which is the beginning of the rainy season in Guangzhou. In June, the subtropical ridge moved to South China, and the Yangtze River basin entered the rainy season. In July, the subtropical high reached the vicinity of the Yangtze River basin in China with the passage of time, and rainy weather appeared in the Yangtze River basin. Summer is the best season for many crops to thrive. Adequate illumination and suitable temperature provide necessary conditions for plants. Most areas will be affected by low pressure and the climate is relatively stable. However, the ocean near the equator will form a typhoon, which is easy to damage the surrounding area. 3. As can be seen from the date distribution map of beginning of autumn in China, the northeast is the earliest place where beginning of autumn in the eastern part of China arrived. In autumn, the cold air in the north keeps invading, but the influence is not very strong. Autumn weather often appears in the north of China, and continuous autumn rain often appears in the west of China. The temperature will gradually drop in autumn, but it is generally slower than in winter. Due to the difference of dry and wet conditions, cold and rainy weather or dry and cold weather will occur in different regions. In the colder late autumn, due to the large temperature difference between day and night, the water vapor transpiration during the day will condense at night, either dew or frost. In many areas, winter means silence and loneliness. When the biological cold current strikes, life activities will be reduced, many plants will shed leaves, animals will choose to hibernate, and some are called hibernation. Migratory birds will fly to warm places for the winter. Extended data:

The four seasons are spring, summer, autumn and winter, and each season lasts for 3 months. Not only is the climate in different parts of the earth very different, but the climate in different seasons in the same area is also different. For example: Yuan Guan Hanqing's "Lu Zhai Lang" is 60% off: My home is happy all year round, spring, summer, autumn and winter! How are the four seasons formed? There is an included angle (2326) between the earth's rotation axis and the earth's rotation axis.

When the sun shines directly on the northern hemisphere, it is summer in the northern hemisphere and winter in the southern hemisphere; On the contrary, when the sun shines directly into the southern hemisphere, it is summer in the southern hemisphere and winter in the northern hemisphere. When the sun shines directly on the Tropic of Cancer, it is the winter solstice (around 65438+February 22nd) and the summer solstice (around June 22nd). When the sun shines directly at the equator, it is the vernal equinox (about March 2 1) and the autumnal equinox (about September 2 1). Reference: spring sogou encyclopedia summer sogou encyclopedia autumn sogou encyclopedia winter sogou encyclopedia year-round sogou encyclopedia